A channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete and a construction method

Abstract

The present invention discloses a channel antifreeze and anti-seepage structure containing phase-change thermal insulation material and modified rubber concrete. The channel antifreeze and anti-seepage structure has an arc-bottom trapezoidal cross-section and includes five layers, which are, from bottom to top, a gravel cushion layer, a one-way drainage composite geomembrane, a low-temperature phase-change energy storage thermal insulation mortar, a leveling mortar, and a modified rubber concrete precast layer. Multiple rows of anti-seepage, anti-clogging, and drainage pressure relief devices are also arranged throughout the structure. The present invention also provides a method for preparing the low-temperature phase-change energy storage thermal insulation mortar and the modified rubber concrete precast blocks. The low-temperature phase-change energy storage thermal insulation mortar has excellent phase-change energy storage, thermal insulation, and waterproof properties. The modified rubber concrete precast blocks have good impact resistance, low elastic modulus, and anti-freeze properties. The present invention effectively improves the antifreeze and anti-seepage capabilities of the channel through the "anti-resistance synergistic" effect of the five-layer structure, especially enhances the resistance to frost heave stress, and ensures the long-term stability and safety of the channel antifreeze and anti-seepage structure in various complex environments.

Description

Technical Field

[0001] The present invention belongs to the technical field of channel structures, and in particular relates to a channel antifreeze and anti-seepage structure containing phase change thermal insulation material and modified rubber concrete and a construction method. Background Art

[0002] In my country's frigid northwest region, water transfer channels, as key infrastructure for water resource management, ensure the rational allocation and efficient utilization of water resources, effectively addressing the region's challenges of uneven water distribution and shortages, and providing solid support for water resource security, agricultural prosperity, ecological balance, and economic development. However, under specific climatic conditions and agricultural production requirements, channels are forced to operate continuously in severe cold. Due to expansion, frost heave, and freeze-thaw cycles, channel structures suffer extensive damage, with cracks and frost heave appearing on the surface of anti-seepage projects. Frost heave damage is particularly severe when low-temperature freezing conditions persist for extended periods, accelerating the aging process of anti-seepage projects and damaging the structures, leading to water resource waste and increased maintenance costs. Therefore, exploring more durable and adaptable channel lining materials and technologies for these special operating conditions is crucial to ensuring the long-term, stable operation of water transfer channels in the northwest region.

[0003] In 2023, my country generated approximately 350 million scrap tires, weighing approximately 12 million tons. Approximately 220 million tires were disposed of in a standardized manner, resulting in a standardized resource utilization rate of 62%, far lower than the utilization rates of waste plastics, waste paper, and waste textiles. my country is a country with scarce rubber resources. Fully utilizing scrap rubber is not only an effective supplement to these resources but also a proven method for transforming harmful waste rubber into beneficial uses. Therefore, by leveraging the elastic and energy-absorbing properties of scrap tires, after proper processing, they can be incorporated into concrete to develop high-performance concrete materials with high energy absorption, fatigue resistance, and excellent durability. However, industrial rubber granules produced using traditional scrap rubber tire processing methods are organic, tough granular aggregates with high deformation, low density, an oleophilic-hydrophobic surface, and easy aggregation. These granules have poor compatibility with cement pastes. Direct use of these granules in inorganic, brittle concrete preparations can significantly negatively impact the performance, mechanical properties, and microstructure of the concrete mix, hindering the full potential of the combined advantages. Therefore, scientific treatment of the rubber surface to ensure good bonding and synergy between the rubber aggregate and the concrete matrix is ​​an urgent problem to be solved in rubber concrete.

[0004] Expanded perlite is widely used in areas such as building insulation due to its low thermal conductivity. However, expanded perlite is ineffective in regulating indoor temperature fluctuations caused by seasonal changes, and its thermal insulation performance is greatly limited. Therefore, as a traditional thermal insulation material, expanded perlite can no longer meet the current insulation technology's demand for efficient coordination of energy across time and space. By utilizing the porous and strong adsorption properties of expanded perlite to store phase change materials in its voids and then formulating an insulation mortar, it is possible to store energy from the environment in the form of latent heat of phase change, releasing this energy when needed. This mortar not only has thermal insulation properties, but also has the ability to store heat and regulate temperature, enabling energy conversion between different times and spaces. In cold winters, it stores energy from direct sunlight and releases heat to raise the indoor temperature, significantly reducing energy consumption and achieving energy conservation and emission reduction.

[0005] Traditional canal construction methods often suffer from long construction cycles, difficulty controlling quality, and high maintenance costs, making them unable to meet the demands of modern agriculture for high efficiency, water conservation, and environmental protection. Precast concrete blocks, with their stable quality, rapid construction, energy conservation, and reduced environmental pollution, have broad application prospects in canal construction. They are crucial for improving water resource utilization efficiency, promoting agricultural modernization, promoting the development of green buildings, and reducing maintenance costs.

[0006] Therefore, a channel antifreeze and anti-seepage structure and a construction method containing phase change insulation material and modified rubber concrete are needed. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to address the deficiencies of the above-mentioned existing technologies and provide a channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete. The present invention sequentially arranges a gravel cushion layer, a one-way drainage composite geomembrane, a low-temperature phase change energy storage insulation mortar, a leveling mortar, and a modified rubber concrete prefabricated layer to form an arc-bottomed trapezoidal cross-section. The bottom is designed as an arc-bottomed trapezoidal cross-section to enhance the stability and adaptability of the overall structure. The channel antifreeze and anti-seepage structure is integrated with multiple rows of anti-seepage, anti-clogging, drainage and pressure relief devices to discharge excess pressurized water at the channel base, thereby ensuring the long-term stability and safety of the channel antifreeze and anti-seepage structure in various complex environments.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: a channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete, characterized in that the channel antifreeze and anti-seepage structure has an arc-bottom trapezoidal cross-section and includes 5 layers, from bottom to top, a gravel cushion layer, a one-way drainage composite geomembrane, a low-temperature phase change energy storage insulation mortar, a leveling mortar and a modified rubber concrete prefabricated layer; the channel antifreeze and anti-seepage structure is penetrated by multiple rows of anti-seepage, anti-clogging and drainage and pressure relief devices.

[0009] The channel antifreeze and anti-seepage structure of the present invention is a structure with an arc-bottom trapezoidal cross-section formed by sequentially arranging a gravel cushion layer, a one-way drainage composite geomembrane, a low-temperature phase-change energy storage thermal insulation mortar, a leveling mortar and a modified rubber concrete prefabricated layer in the channel. The bottom is designed as an arc-bottom trapezoidal cross-section to enhance the stability and adaptability of the overall structure. The channel antifreeze and anti-seepage structure is integrated with multiple rows of anti-seepage, anti-clogging and drainage pressure relief devices to discharge excess pressure water at the bottom of the channel to ensure the long-term stability and safety of the channel antifreeze and anti-seepage structure in various complex environments. The low-temperature phase Variable energy storage insulation mortar has excellent thermal insulation performance, good compressive strength and waterproof performance, and can automatically absorb and release heat to effectively resist low temperature environment, effectively delay the freezing process and improve the antifreeze performance of the material; the modified rubber concrete precast layer, with its excellent mechanical properties, impact resistance, low elastic modulus and excellent antifreeze performance, has become the preferred solution for channel frost heave stress in the western region with large temperature difference and cold environment, reducing the pollution of waste rubber tires to the environment and achieving the dual goals of efficient recycling of waste resources and environmental protection.

[0010] The present invention combines a modified rubber concrete prefabricated layer with a low-temperature phase-change energy storage insulation mortar. By optimizing the channel's anti-freeze and anti-seepage structure, a full-section modified rubber concrete prefabricated layer lining scheme is used to arrange an arc-bottomed trapezoidal section, thereby greatly improving the channel structure's anti-frost heave and anti-seepage performance. It can also solve the problem of easy frost heave and cracking at the corners of traditional flat-bottomed sections. In addition, the arc-bottomed trapezoidal section based on the modified rubber concrete prefabricated layer also has certain advantages in terms of construction cost and construction efficiency. Applying this technology to water channel lining projects in the severely cold northwest region not only makes full use of waste rubber resources, rationally utilizes resources and reduces environmental pollution, but is expected to provide a more reliable, environmentally friendly and economical solution for water channel projects in the northwest region, further promoting the efficient utilization and rational allocation of water resources.

[0011] It should be noted that the anti-seepage and anti-clogging drainage and pressure relief device is an anti-clogging check valve.

[0012] The above-mentioned channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete is characterized in that the thickness of the gravel cushion layer is 10cm to 20cm, the thickness of the one-way drainage composite geomembrane is 2mm to 3mm, the thickness of the low-temperature phase change energy storage insulation mortar is 6cm to 10cm, the thickness of the leveling mortar is 2mm to 3mm, the thickness of the modified rubber concrete prefabricated layer is 7.0cm to 10.0cm, and the modified rubber concrete prefabricated layer includes a channel slope provided on the channel slope. prefabricated blocks and arc-shaped channel bottom prefabricated blocks arranged on the channel bottom; two rows of staggered anti-seepage and anti-clogging drainage and pressure relief devices are arranged on each side of the channel slope of the channel anti-freezing and anti-seepage structure, and a row of anti-seepage and anti-clogging drainage and pressure relief devices is arranged in the middle part of the channel bottom of the channel anti-freezing and anti-seepage structure, and the spacing between the anti-seepage and anti-clogging drainage and pressure relief devices in the same row is 10m to 15m, and one row of anti-seepage and anti-clogging drainage and pressure relief devices on each side of the channel slope is 50cm to 60cm high from the slope foot, and the other row is 50cm to 60cm below the normal water level of the channel.The present invention provides a stable foundation for the upper structure by setting a sand and gravel cushion layer and controlling its thickness, thereby improving the bearing capacity of the foundation, reducing foundation settlement, accelerating the drainage and consolidation of the weak soil layer, and having a certain thermal insulation property to prevent frost heave; by setting a one-way drainage composite geomembrane and controlling its thickness, it prevents water from penetrating, and its one-way drainage performance ensures that water can be discharged smoothly, effectively isolates water, and improves the anti-seepage performance of the channel; by setting a low-temperature phase change energy storage insulation mortar and controlling its thickness, it utilizes the phase change energy storage principle to absorb or release heat when the temperature fluctuates, thereby improving the thermal insulation performance of the channel and reducing energy loss, and also helps to prevent frost heave damage, which is particularly suitable for cold areas, and by controlling the thickness, it fully meets the requirements of thermal insulation and energy storage, and in terms of anti-frost heave effect, has the same thermal insulation effect as replacing 50cm to 60cm thick sand and gravel, which can effectively reduce the thickness of the sand and gravel cushion layer, reduce engineering workload, and save construction time; by setting a leveling mortar and controlling its thickness, it ensures the flatness and Stability helps to reduce stress concentration caused by unevenness; by setting a modified rubber concrete prefabricated layer as the main structural part of the channel, it withstands water flow impact and load. Its prefabrication helps to speed up construction and improve project quality. It has the characteristics of high strength, good durability, and convenient construction. By controlling its thickness, it can meet the structural strength requirements while maintaining a light weight, which is convenient for transportation and installation, ensuring the long-term stable operation of the channel. In addition, by dividing the modified rubber concrete prefabricated layer into a channel slope prefabricated block set on the channel slope and an arc-shaped channel bottom prefabricated block set on the channel bottom, it is convenient to prefabricate and improve the convenience of construction. By controlling the installation position of the anti-seepage, anti-clogging and drainage pressure relief device, it is convenient to drain water and ensure the performance of the channel anti-freeze and anti-seepage structure. The present invention can give full play to the respective advantages through the combination of the above structures to form a channel anti-freeze and anti-seepage structure with multiple functions such as anti-seepage, drainage, thermal insulation and anti-freeze, high strength and stability, thereby improving the overall performance and service life of the channel.

[0013] The above-mentioned channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete is characterized in that the preparation method of the low-temperature phase change energy storage insulation mortar comprises the following steps:

[0014] Step 1: preparing calcined expanded perlite: calcining the expanded perlite in stages to obtain calcined expanded perlite;

[0015] Step 2: preparing a composite phase change energy storage material: heating glycerol, KCl, Al(NO3)3 and H2O in a water bath and blending them, then adding SrCl2 as a nucleating agent and performing ultrasonic dispersion to obtain a composite phase change energy storage material;

[0016] Step 3: preparing phase-change expanded perlite: pouring the composite phase-change energy storage material obtained in step 2 into a suction flask and heating it in a water bath, then pouring the calcined expanded perlite obtained in step 1 into the suction flask, evacuating the suction flask, and finally cooling it at room temperature to obtain phase-change expanded perlite;

[0017] Step 4, surface treatment of the vitrified microspheres and the phase-change expanded perlite: the vitrified microspheres and the phase-change expanded perlite obtained in step 3 are placed in a blender for stirring, and while stirring, the silane coupling agent is evenly sprayed on the surfaces of the phase-change expanded perlite and the vitrified microspheres through an ultrasonic atomizing nozzle. After the spraying is completed, the sprayed vitrified microspheres and the phase-change expanded perlite are taken out and placed in a desiccator for aging, respectively, to obtain surface-treated vitrified microspheres and surface-treated phase-change expanded perlite, respectively.

[0018] Step 5. Preparation of low-temperature phase-change energy storage and thermal insulation mortar: put the glue powder and water into a zero-gravity mixer and stir for more than 60 seconds, then add the surface-treated vitrified microspheres and surface-treated phase-change expanded perlite obtained in step 4 at a speed of 40 rpm to 60 rpm, stir for 3 min to 5 min, and obtain a low-temperature phase-change energy storage and thermal insulation mortar with a consistency of 70 mm to 90 mm; the low-temperature phase-change energy storage and thermal insulation mortar is composed of the following components in parts by mass: glue powder The invention discloses a novel adhesive composition comprising the following components: 170-180 parts of surface-treated glass microspheres and 120-130 parts of surface-treated phase-change expanded perlite, and the mass ratio of water to rubber powder is 0.7-0.9:1, and the volume ratio of the surface-treated glass microspheres and the surface-treated phase-change expanded perlite is 6-7:3-4; the rubber powder is composed of the following components in parts by mass: 136-144 parts of cement, 25.5-27 parts of fly ash, 8.5-9 parts of slaked lime, 1.36-1.44 parts of Wacker latex powder 4015N, 0.34-0.36 parts of hydroxypropyl methylcellulose, 0.136-0.144 parts of triethanolamine, 0.34-0.36 parts of sodium methyl siliconate, and 0.7-1.0 parts of polypropylene fiber.

[0019] The present invention prepares calcined expanded perlite by calcining expanded perlite in stages, which is fully expanded and has a more uniformly arranged pore structure. The present invention utilizes organic and inorganic phase change materials for compounding, i.e., propylene glycol, KCl, Al(NO3)3 and H2O are heated in a water bath and mixed, thereby improving the problems of low latent heat and low thermal conductivity of propylene glycol, and compensating for the shortcomings of large supercooling and easy phase separation of KCl and Al(NO3)3, thereby optimizing the phase change temperature and latent heat of the material, forming a material with higher energy storage density, thereby improving the energy storage performance of the material. SrCl2 acts as a nucleating agent to promote uniform dispersion of the material and enhance the thermal stability and molecular stability of the material. The present invention uniformly infiltrates the composite phase change energy storage material into the pore structure of the calcined expanded perlite, and firmly combines the composite phase change energy storage material on the calcined expanded perlite through vacuuming and cooling solidification, thereby preparing expanded perlite with phase change energy storage function. The present invention adopts ultrasonic atomization spraying Silane coupling agent has a stable and efficient spraying effect and can quickly form a thin film on the surface of glass beads and phase change expanded perlite, thereby improving its waterproofness, wear resistance and aging resistance, and improving its bonding performance with other materials. The rubber powder of the present invention is mainly composed of cement, fly ash, slaked lime, etc., and the added Wacker latex powder, hydroxypropyl methylcellulose, triethanolamine, and sodium methylsiliconate components can enable the perlite mortar to form a tight and interwoven network film structure after hardening, which significantly enhances the bonding force between rubber particles and cement-based materials, not only optimizes the overall structure of the thermal insulation mortar, but also greatly improves its flexibility. Polypropylene fibers are randomly distributed in the mortar to form an effective network entanglement structure, which effectively prevents slippage between aggregates, thereby reducing the generation of cracks. The use of a zero-gravity mixer for stirring can rely on its unique mixing technology to ensure that the material is not affected by differences in particle size and specific gravity during the mixing process, thereby achieving an efficient and uniform mixing effect.

[0020] The above-mentioned channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete is characterized in that the process of staged calcination in step 1 is: heating to 400°C at a heating rate of 10°C / min to 20°C / min, then keeping warm for 0.5h to 1h, then heating to 800°C at a heating rate of 10°C / min to 20°C / min, then keeping warm for 0.5h to 1h, then heating to 850°C to 1000°C at a heating rate of 5°C / min to 10°C / min, then keeping warm for 1h to 2h, and finally cooling to room temperature. The present invention prepares expanded perlite with complete expansion and a more uniform pore structure by controlling the parameters of the staged calcination.

[0021] The above-mentioned channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete is characterized in that the mass ratio of glycerol, KCl, Al(NO3)3 and H2O in step 2 is 1-1.5:1.0-1.5:2.0-2.5:4.5-5.8, the amount of SrCl2 added is 1%-2% of the total mass of glycerol, KCl, Al(NO3)3 and H2O, the temperature of the water bath heating blending is 50°C-60°C, and the time of the ultrasonic dispersion is 0.5h-1h. The present invention ensures that the composite phase change energy storage material has optimal performance by controlling the composition and configuration parameters of the composite phase change energy storage material.

[0022] The aforementioned antifreeze and anti-seepage channel structure containing phase-change thermal insulation material and modified rubber concrete is characterized in that the water bath heating temperature in step 3 is 50°C to 60°C, the vacuuming pressure is -0.05MPa to -0.07MPa, the time is 10 minutes to 20 minutes, and the cooling time is at least 24 hours. The present invention ensures that the phase-change expanded perlite has optimal performance by controlling the parameters for preparing the phase-change expanded perlite.

[0023] The aforementioned antifreeze and anti-seepage channel structure containing phase change insulation material and modified rubber concrete is characterized in that the stirring speed in step 4 is 40 rpm to 60 rpm for 3 to 5 minutes, the silane coupling agent is KH550 or KH570, and the aging time is 48 hours or longer. The present invention controls the stirring parameters to evenly spray the silane coupling agent on the surfaces of the glass microspheres and phase change expanded perlite.

[0024] The above-mentioned channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete is characterized in that the modified rubber concrete prefabricated layer is made of the following components in parts by mass: 153-157 parts of water, 274-292 parts of cement, 73-91 parts of fly ash, 654-730 parts of sand, 1180-1190 parts of gravel, 4.198-4.445 parts of water reducer, 0.517-0.531 parts of air entraining agent and 39-115 parts of modified rubber powder.

[0025] The above-mentioned channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete is characterized in that the preparation method of the modified rubber powder comprises the following steps:

[0026] Step 1: Sorting and crushing of waste rubber: crushing and separating the waste rubber to obtain rubber powder with a particle size of less than 16 mesh;

[0027] Step 2: Cleaning: Soak the rubber powder obtained in step 1 in clean water for 6 to 8 hours, and mechanically stir for 10 minutes every 2 to 3 hours, then remove it and soak it in 1.0 mol / L to 2.0 mol / L NaOH solution for 24 hours, and mechanically stir for 10 minutes every 4 to 6 hours, then wash it until it is neutral and dry it;

[0028] Step 3: Ultrasonic desulfurization and activation treatment: The rubber powder dried in step 2 is activated by an ultrasonic energy-focusing transducer at a frequency of 20kHz to 50kHz for 10 to 20 minutes, and then aged in a dry environment for 6 to 10 hours to obtain desulfurized activated rubber powder;

[0029] Step 4, preparing hydrophilic rubber powder: mixing the desulfurized activated rubber powder obtained in step 3 with a dispersant solution at a mass and volume ratio of 900-1100:200-400, where the mass is in g and the volume is in mL, wherein the mass of the dispersant is 1%-3% of the mass of the desulfurized activated rubber powder, then heating to 60°C-100°C and stirring at a speed of 150rpm-200rpm for 2min-5min, then adding a modifier and stirring for 30min-50min, and then washing the product to obtain hydrophilic rubber powder; the modifier is three or more of maleic anhydride, acrylic acid, sodium methacrylic acid, urea, sodium polystyrene sulfonate, ammonium persulfate, and mercaptopropionic acid;

[0030] Step 5, inorganic encapsulation modification: The hydrophilic rubber powder obtained in step 4 and the inorganic modified admixture with a volume ratio of 3 to 5:1 are placed into an air flow stirring device, mixed and stirred for 10 to 20 minutes, and then aged for 24 hours to obtain modified rubber powder; the inorganic modified admixture is ultrafine silicon powder, metakaolin and phosphorus slag powder with a mass ratio of 2 to 3:3 to 4:3 to 4.

[0031] The present invention obtains small rubber powder particles by crushing, and removes impurities such as oil, dust, and organic matter on the surface of the rubber powder by cleaning, thereby increasing the roughness and hydrophilicity of the rubber powder surface and improving the interfacial bonding performance between the rubber powder and cement. The present invention also uses ultrasonic desulfurization and activation treatment, in which the acoustic energy directly acts on the rubber powder to cause cavitation, destroying the CS bonds and SS bonds in the rubber powder, which have lower energy than the CC bonds, and selectively destroying the three-dimensional network structure to achieve desulfurization and regeneration. The physical and mechanical properties of the desulfurized and activated rubber powder after vulcanization are similar to those of the original rubber material, and the product has the advantages of high product quality, no pollution, and low energy consumption.

[0032] The present invention uses a dispersant to prevent the desulfurized activated rubber powder from agglomerating and to disperse it more evenly in the solution; the main component of the desulfurized activated rubber powder is polyisoprene, which contains a large number of unsaturated double bonds, making the rubber particles hydrophobic, and having low adhesion to the cement substrate, resulting in serious defects on the interface, which leads to low elastic modulus, large deformation and reduced compressive strength of the rubber concrete; the C=C on the surface of the rubber particles is broken by a chemical modification method, and hydrophilic groups such as -CO-, -OH and -SO3H are introduced, thereby adding orientation forces between polar molecules and polar molecules between the contact surfaces of the rubber and concrete materials, making the two more tightly bonded, thereby enhancing various properties of the modified rubber concrete prefabricated layer, and at the same time solving the problem of oleophilicity and hydrophobicity on the surface of the rubber powder. The problem of easy floating in concrete; the present invention uses air flow to mix, disperse and refine inorganic admixtures and hydrophilic rubber powder in the air flow, and embeds it into the hydrophilic rubber powder through complex stress effects such as shearing, impact and stirring. The inorganic powder is evenly distributed in the cracks and pores of the hydrophilic rubber powder, forming adsorption and embedding effects with the hydrophilic rubber powder, which greatly avoids the occurrence of mixture exudation and stratification and uneven components after hardening when it is used as concrete aggregate, and forms an inorganic coating layer on the surface of the hydrophilic rubber powder, which improves the dispersibility of the modified rubber powder in concrete, avoids the occurrence of modified rubber powder agglomeration, and enhances the interface bonding force between the modified rubber powder and the concrete matrix, thereby improving the mechanical properties of the modified rubber concrete precast layer.

[0033] In addition, the present invention also provides a construction method for a channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete, characterized in that the method comprises the following steps:

[0034] Step 1: Measure and set out: Use a total station to measure and set out;

[0035] Step 2: Channel base surface treatment: excavate the trapezoidal channel according to the measurement and layout in step 1;

[0036] Step 3: Lay the gravel cushion layer: Lay the gravel cushion layer in the trapezoidal channel excavated in step 2;

[0037] Step 4: Arrange anti-seepage, anti-clogging, drainage and pressure relief devices: Arrange anti-seepage, anti-clogging, drainage and pressure relief devices in the gravel cushion layer laid in step 3;

[0038] Step 5: Laying and splicing one-way drainage composite geomembrane: Laying and splicing one-way drainage composite geomembrane on the gravel cushion layer after the anti-seepage, anti-clogging and drainage pressure relief device is arranged in step 4;

[0039] Step 6: Apply low-temperature phase-change energy storage thermal insulation mortar: Apply low-temperature phase-change energy storage thermal insulation mortar on the spliced ​​one-way drainage composite geomembrane laid in step 5;

[0040] Step 7: Spreading a prefabricated layer of modified rubber concrete, applying leveling mortar on the low-temperature phase change energy storage insulation mortar applied in step 6, and then spreading the prefabricated layer of modified rubber concrete on the leveling mortar;

[0041] Step 8: Surface inspection and anti-seepage treatment: Inspect the modified rubber concrete precast layer paved in step 7 and apply polyvinyl chloride putty to the defective parts;

[0042] Step 9, maintenance and acceptance: the structure coated with polyvinyl chloride mortar in step 8 is maintained and then inspected to obtain a channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete.

[0043] Compared with the prior art, the present invention has the following advantages:

[0044] 1. The present invention sequentially arranges a gravel cushion layer, a one-way drainage composite geomembrane, a low-temperature phase change energy storage insulation mortar, a leveling mortar and a modified rubber concrete prefabricated layer to form a channel antifreeze and anti-seepage structure with an arc-bottom trapezoidal cross-section. The bottom is designed to be an arc-bottom trapezoidal cross-section to enhance the stability and adaptability of the overall structure. The channel antifreeze and anti-seepage structure is integrated with multiple rows of anti-seepage, anti-clogging and drainage pressure relief devices to discharge excess pressurized water at the channel base, thereby ensuring the long-term stability and safety of the channel antifreeze and anti-seepage structure in various complex environments.

[0045] 2. The low-temperature phase change energy storage insulation mortar of the present invention has excellent thermal insulation performance, good compressive strength and waterproof performance, and can automatically absorb heat and release heat to effectively resist low-temperature environment, effectively delay the freezing process and improve the antifreeze performance of the material. The modified rubber concrete precast layer, with its excellent mechanical properties, impact resistance, low elastic modulus and excellent antifreeze performance, has become the preferred solution for channel frost heave stress in the western region with large temperature difference and cold environment, reducing the pollution of waste rubber tires to the environment, and achieving the dual goals of efficient recycling of waste resources and environmental protection. The channel antifreeze and anti-seepage structure has a high degree of production standardization and construction quality, which improves construction efficiency.

[0046] 3. The present invention utilizes waste rubber tire particles and innovatively prepares modified rubber powder by combining physical-chemical modification with inorganic material coating technology. The modified rubber powder shows good compatibility with cement-based materials, effectively avoiding the floating stratification phenomenon and ensuring the stability of the interface. Compared with traditional concrete, the concrete prepared with this modified rubber powder has excellent performance in crack resistance and impact resistance, and at the same time has a lower elastic modulus and excellent freeze-thaw resistance. It can not only effectively deal with the frost heave stress problem caused by the large temperature difference and cold environment in the western region to the channel, but also significantly reduce the pollution of waste rubber tires to the environment, achieving the dual goals of effective utilization of waste resources and environmental protection.

[0047] 4. The present invention prepares an inorganic-organic composite low-temperature phase change energy storage and insulation mortar with excellent energy storage performance and the advantages of composite materials. It effectively overcomes the shortcomings of single-species phase change materials, such as low thermal conductivity and phase change latent heat, supercooling, and phase separation. By utilizing the strong adsorption properties of expanded perlite to absorb the phase change material, a vacuum impregnation process is used to prepare a vitrified microsphere-expanded perlite-based composite low-temperature phase change insulation material. This material not only automatically adjusts the temperature to maintain a stable channel environment, but also achieves heat storage and energy conservation, improving energy utilization efficiency. When the ambient temperature drops to near freezing, the phase change material begins to undergo a phase change, releasing heat, thereby reducing damage caused by freezing, effectively delaying the freezing process, and improving the material's anti-freeze properties. The higher thermal insulation effect can effectively reduce the thickness of the gravel layer by more than 30 cm, increase the channel's cross-sectional area, and increase the flow rate. The material is safe, reliable, environmentally friendly, simple to construct, and compatible with traditional building materials. It not only helps improve the operating efficiency and safety of the channel, but also effectively reduces maintenance costs, making it an ideal choice for channel insulation.

[0048] 5. The drainage system of the present invention is composed of a check valve that realizes a one-way drainage function by utilizing the fluctuation of the water level in the channel and under the channel base. It can prevent infiltration into the channel base during the channel operation period, and discharge the water infiltrating the channel base into the channel in a one-way manner during the channel water outage period. It can effectively lower the water level under the channel base, ensure the stability of the structure, and actively reduce the damage caused by excessive osmotic pressure in the channel due to leakage.

[0049] 6. The present invention adopts a trapezoidal cross-section design of a full-section modified rubber concrete prefabricated layer lining. The arc-bottom trapezoidal cross-section has no obvious stress angle at the reverse arch bottom. When the gravel cushion layer at the arc bottom suffers from slight frost heave, it can ensure uniform force and avoid cracking and bulging due to excessive concentration of local stress. It has better anti-frost heave performance, not only reduces leakage and optimizes water flow conditions by the arc-bottom design to increase water flow, but also solves the problem of easy frost heave and cracking at the corners of traditional flat-bottom sections. The production of prefabricated blocks is highly standardized, which not only ensures the consistency of construction quality, but also greatly shortens on-site construction time, improves construction efficiency, and saves construction costs. It also shows obvious advantages. It is an advanced technical solution worthy of promotion in modern water conservancy projects.

[0050] 7. The modified rubber concrete prefabricated layer material of the present invention has high strength, good erosion resistance and frost resistance, and has improved toughness and ductility, which to a certain extent improves the deformation resistance of the concrete channel anti-freeze and anti-seepage structure. It is produced using designed and formed molds, which not only has high integration and guaranteed quality, but also has good appearance effects, can be mass-produced, and greatly improves the construction progress.

[0051] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural schematic diagram of the channel antifreeze and anti-seepage structure containing phase change thermal insulation material and modified rubber concrete of the present invention.

[0053] Figure 2 yes Figure 1 Enlarged view of point A.

[0054] Figure 3 It is a structural schematic diagram of the channel slope prefabricated blocks and the channel bottom prefabricated blocks in the modified rubber concrete prefabricated layer of the present invention.

[0055] Description of reference numerals:

[0056] 1—sand and gravel cushion layer; 2—one-way drainage composite geomembrane; 3—low-temperature phase change energy storage and thermal insulation mortar;

[0057] 4—Leveling mortar; 5—Precast modified rubber concrete layer; 6—Anti-seepage, anti-clogging, drainage and pressure relief device;

[0058] 7—Channel slope prefabricated blocks; 8—Channel bottom prefabricated blocks. DETAILED DESCRIPTION

[0059] Figure 1 This is a schematic structural diagram of a channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete according to the present invention. Figure 2 yes Figure 1 A magnified view from Figure 1 and Figure 2 It can be seen that the channel antifreeze and anti-seepage structure has an arc-bottom trapezoidal cross-section and includes 5 layers, which are, from bottom to top, a gravel cushion layer 1, a one-way drainage composite geomembrane 2, a low-temperature phase change energy storage insulation mortar 3, a leveling mortar 4 and a modified rubber concrete prefabricated layer 5; multiple rows of anti-seepage, anti-clogging and drainage pressure relief devices 6 are arranged throughout the channel antifreeze and anti-seepage structure.

[0060] Figure 3 This is a schematic diagram of the structure of the channel slope prefabricated blocks and channel bottom prefabricated blocks in the modified rubber concrete prefabricated layer of the present invention. Figure 3 As can be seen in the figure, the modified rubber concrete prefabricated layer 6 includes a channel slope prefabricated block 7 arranged on the channel slope and an arc-shaped channel bottom prefabricated block 8 arranged on the channel bottom.

[0061] Example 1

[0062] This embodiment includes the following steps:

[0063] Step 1, preparing calcined expanded perlite: heating the expanded perlite to 400°C at a heating rate of 20°C / min and holding the temperature for 0.5h, then heating to 800°C at a heating rate of 20°C / min and holding the temperature for 0.5h, then heating to 950°C at a heating rate of 10°C / min and holding the temperature for 1h, and finally cooling to room temperature to obtain calcined expanded perlite;

[0064] Step 2: Prepare a composite phase change energy storage material: Glycerol, KCl, Al(NO3)3 and H2O in a mass ratio of 1.5:1.0:2.0:5.0 are heated in a water bath at 60°C and mixed, and then 1.5% SrCl2 of the total mass of glycerol, KCl, Al(NO3)3 and H2O is added as a nucleating agent and ultrasonically dispersed for 1 hour to obtain a composite phase change energy storage material;

[0065] Step 3: Prepare phase-change expanded perlite: Pour the composite phase-change energy storage material obtained in step 2 into a suction flask and heat it in a water bath at 60°C. Then pour the calcined expanded perlite obtained in step 1 into the suction flask. Then, vacuum the flask at a pressure of -0.07 MPa for 15 minutes. Finally, cool it at room temperature for more than 24 hours to obtain phase-change expanded perlite.

[0066] Step 4, surface treatment of vitrified microspheres and phase-change expanded perlite: The vitrified microspheres and the phase-change expanded perlite obtained in step 3 are placed in a blender and stirred at a speed of 50 rpm for 3 minutes, and while stirring, the silane coupling agent KH570 is evenly sprayed on the surface of the phase-change expanded perlite and the vitrified microspheres through an ultrasonic atomizing nozzle. After spraying, the sprayed vitrified microspheres and phase-change expanded perlite are taken out and placed in a desiccator for aging for more than 48 hours to obtain surface-treated vitrified microspheres and surface-treated phase-change expanded perlite, respectively.

[0067] Step 5. Preparation of low-temperature phase change energy storage and thermal insulation mortar: put the glue powder and water into a zero-gravity mixer and stir for more than 60 seconds, then add the surface-treated glass microspheres and surface-treated phase-change expanded perlite obtained in step 4 at a speed of 50 rpm and stir for 5 minutes to obtain a low-temperature phase change energy storage and thermal insulation mortar with a consistency of 80 mm; the low-temperature phase change energy storage and thermal insulation mortar is composed of the following components in parts by mass: 180 parts of glue powder, 130 parts of surface-treated glass microspheres and surface-treated phase-change expanded perlite, and the mass ratio of water to glue powder is 0.8:1, and the volume ratio of the surface-treated glass microspheres and the surface-treated phase-change expanded perlite is 7:3; the glue powder is composed of the following components in parts by mass: 138 parts of cement, 27 parts of fly ash, 9 parts of slaked lime, Wacker latex powder 4015N 1.40 parts, 0.345 parts of hydroxypropyl methylcellulose, 0.136 parts of triethanolamine, 0.36 parts of sodium methyl siliconate, and 0.9 parts of polypropylene fiber.

[0068] After testing, the ternary inorganic-organic composite low-temperature phase change energy storage material prepared in this embodiment has a melting temperature of 4.52°C and a phase change enthalpy of 268.5 J / g. By adding a SrCl2 nucleating agent with a mass fraction of 1.5%, the supercooling of the system can be reduced to 2.25°C. After 200 thermal cycles, the low-temperature phase change energy storage thermal insulation mortar did not produce a large amount of leakage and had good stability. From the perspective of phase change latent heat, after 200 thermal cycles, the low-temperature phase change energy storage thermal insulation mortar maintained a high phase change latent heat characteristic, and the impact of thermal cycling on it was small.

[0069] The low-temperature phase-change energy storage and thermal insulation mortar prepared in this embodiment effectively improves the problems of supercooling and phase separation, and can control the melting temperature at around 4°C. When the ambient temperature drops to near the freezing point, the phase-change material will begin to undergo a phase change and release heat, thereby reducing damage caused by freezing. It can effectively delay the freezing process and improve the antifreeze performance of the material. This feature is particularly important in applications in cold areas, and can greatly extend the service life of the structure and reduce damage caused by freezing.

[0070] The compressive strength of the low-temperature phase change energy storage thermal insulation mortar prepared in this embodiment is 3.25 MPa, and the dry density is 398 kg / m 3 , water absorption is 2.35%, thermal conductivity is 0.0587W·(m·K) -1 , the heat storage coefficient is 20.85W / (m 2 ·K).

[0071] In summary, the low-temperature phase change energy storage insulation mortar prepared in this embodiment has excellent thermal insulation performance, good compressive strength and waterproof performance, as well as the characteristics of being light and easy to construct, and can automatically absorb and release heat to effectively resist low temperature environments.

[0072] Example 2

[0073] This embodiment includes the following steps:

[0074] Step 1, preparing calcined expanded perlite: heating the expanded perlite to 400°C at a heating rate of 10°C / min and holding the temperature for 1 hour, then heating to 800°C at a heating rate of 10°C / min and holding the temperature for 1 hour, then heating to 850°C at a heating rate of 5°C / min and holding the temperature for 2 hours, and finally cooling to room temperature to obtain calcined expanded perlite;

[0075] Step 2: Prepare a composite phase change energy storage material: Glycerol, KCl, Al(NO3)3 and H2O in a mass ratio of 1:1.5:2.5:4.5 are heated in a water bath at 55°C and mixed, and then 1% SrCl2 of the total mass of glycerol, KCl, Al(NO3)3 and H2O is added as a nucleating agent and ultrasonically dispersed for 0.5h to obtain a composite phase change energy storage material;

[0076] Step 3: Prepare phase-change expanded perlite: Pour the composite phase-change energy storage material obtained in step 2 into a suction flask and heat it in a water bath at 50°C. Then pour the calcined expanded perlite obtained in step 1 into the suction flask, and then vacuum the flask at a pressure of -0.06 MPa for 20 minutes. Finally, cool it at room temperature for more than 24 hours to obtain phase-change expanded perlite.

[0077] Step 4, surface treatment of vitrified microspheres and phase-change expanded perlite: The vitrified microspheres and the phase-change expanded perlite obtained in step 3 are placed in a blender and stirred at a speed of 60 rpm for 4 minutes, and while stirring, the silane coupling agent KH550 is evenly sprayed on the surface of the phase-change expanded perlite and the vitrified microspheres through an ultrasonic atomizing nozzle. After spraying, the sprayed vitrified microspheres and phase-change expanded perlite are taken out and placed in a desiccator for aging for more than 48 hours to obtain surface-treated vitrified microspheres and surface-treated phase-change expanded perlite, respectively;

[0078] Step 5. Preparation of low-temperature phase change energy storage and thermal insulation mortar: put the glue powder and water into a zero-gravity mixer and stir for more than 60 seconds, then add the surface-treated glass microspheres and surface-treated phase-change expanded perlite obtained in step 4 at a speed of 40 rpm and stir for 4 minutes to obtain a low-temperature phase change energy storage and thermal insulation mortar with a consistency of 70 mm; the low-temperature phase change energy storage and thermal insulation mortar is composed of the following components in parts by mass: 175 parts of glue powder, 120 parts of surface-treated glass microspheres and surface-treated phase-change expanded perlite, and the mass ratio of water to glue powder is 0.7:1, and the volume ratio of the surface-treated glass microspheres and the surface-treated phase-change expanded perlite is 6:4; the glue powder is composed of the following components in parts by mass: 144 parts of cement, 25.5 parts of fly ash, 8.8 parts of slaked lime, Wacker latex powder 4015N 1.44 parts, 0.34 parts of hydroxypropyl methylcellulose, 0.140 parts of triethanolamine, 0.35 parts of sodium methyl siliconate, and 0.7 parts of polypropylene fiber.

[0079] Example 3

[0080] This embodiment includes the following steps:

[0081] Step 1, preparing calcined expanded perlite: heating the expanded perlite to 400°C at a heating rate of 15°C / min and holding the temperature for 0.8h, then heating to 800°C at a heating rate of 15°C / min and holding the temperature for 0.8h, then heating to 1000°C at a heating rate of 7°C / min and holding the temperature for 1.5h, and finally cooling to room temperature to obtain calcined expanded perlite;

[0082] Step 2: Prepare a composite phase change energy storage material: Glycerol, KCl, Al(NO3)3 and H2O in a mass ratio of 1.8:1.3:2.2:5.8 are heated in a water bath at 50°C and mixed, and then 2% SrCl2 of the total mass of glycerol, KCl, Al(NO3)3 and H2O is added as a nucleating agent and ultrasonically dispersed for 0.8h to obtain a composite phase change energy storage material;

[0083] Step 3: Prepare phase-change expanded perlite: Pour the composite phase-change energy storage material obtained in step 2 into a suction flask and heat it in a water bath at 55°C. Then pour the calcined expanded perlite obtained in step 1 into the suction flask, evacuate the flask at a pressure of -0.05 MPa for 10 minutes, and finally cool it at room temperature for more than 24 hours to obtain phase-change expanded perlite.

[0084] Step 4, surface treatment of vitrified microspheres and phase-change expanded perlite: The vitrified microspheres and the phase-change expanded perlite obtained in step 3 are placed in a blender and stirred at a speed of 40 rpm for 5 minutes, and while stirring, the silane coupling agent KH570 is evenly sprayed on the surface of the phase-change expanded perlite and the vitrified microspheres through an ultrasonic atomizing nozzle. After spraying, the sprayed vitrified microspheres and phase-change expanded perlite are taken out and placed in a desiccator for aging for more than 48 hours to obtain surface-treated vitrified microspheres and surface-treated phase-change expanded perlite, respectively;

[0085] Step 5. Preparation of low-temperature phase change energy storage and thermal insulation mortar: put the glue powder and water into a zero-gravity mixer and stir for more than 60 seconds, then add the surface-treated glass microspheres and surface-treated phase-change expanded perlite obtained in step 4 at a speed of 60 rpm and stir for 3 minutes to obtain a low-temperature phase change energy storage and thermal insulation mortar with a consistency of 90 mm; the low-temperature phase change energy storage and thermal insulation mortar is composed of the following components in parts by mass: 170 parts of glue powder, 125 parts of surface-treated glass microspheres and surface-treated phase-change expanded perlite, and the mass ratio of water to glue powder is 0.9:1, and the volume ratio of the surface-treated glass microspheres and the surface-treated phase-change expanded perlite is 6.5:3.5; the glue powder is composed of the following components in parts by mass: 136 parts of cement, 26 parts of fly ash, 8.5 parts of slaked lime, Wacker latex powder 4015N 1.36 parts, 0.36 parts of hydroxypropyl methylcellulose, 0.144 parts of triethanolamine, 0.34 parts of sodium methyl siliconate, and 1.0 parts of polypropylene fiber.

[0086] Example 4

[0087] This embodiment includes the following steps:

[0088] Step 1: Sorting and crushing of waste rubber: crushing and separating the waste rubber to obtain rubber powder with a particle size of less than 16 mesh;

[0089] Step 2: Cleaning: Soak the rubber powder obtained in step 1 in clean water for 7 hours, and mechanically stir for 10 minutes every 2.5 hours, then remove it and soak it in 1.5 mol / L NaOH solution for 24 hours, and mechanically stir for 10 minutes every 5 hours, then wash it until it is neutral and dry it;

[0090] Step 3: Ultrasonic desulfurization and activation treatment: The rubber powder dried in step 2 is activated using an ultrasonic energy-focusing transducer at a frequency of 50 kHz for 10 minutes, and then aged in a dry environment for 8 hours to obtain desulfurized and activated rubber powder;

[0091] Step 4, preparation of hydrophilic rubber powder: the desulfurized activated rubber powder obtained in step 3 and the polyetherimide solution are mixed in a mass and volume ratio of 1000:300, the unit of mass is g, and the unit of volume is mL, wherein the mass of the polyetherimide is 3% of the mass of the desulfurized activated rubber powder, then heated to 90°C and stirred at a stirring speed of 150 rpm for 5 minutes, then added with a modifier and stirred for another 40 minutes, and then the product is washed to obtain hydrophilic rubber powder; the modifier is acrylic acid, sodium methacrylic acid, ammonium persulfate and mercaptopropionic acid; the amount of the modifier is such that: the mass of acrylic acid is 2 times the mass of the desulfurized activated rubber powder, the mass of sodium methacrylic acid is 80% of the mass of the desulfurized activated rubber powder, the mass of ammonium persulfate is 2% of the mass of the desulfurized activated rubber powder, and the mass of mercaptopropionic acid is 0.1% of the mass of the desulfurized activated rubber powder;

[0092] Step 5, inorganic encapsulation modification: The hydrophilic rubber powder obtained in step 4 and the inorganic modified admixture with a volume ratio of 4:1 are placed into an air flow stirring device, mixed and stirred for 15 minutes, and then aged for 24 hours to obtain modified rubber powder; the inorganic modified admixture is ultrafine silicon powder, metakaolin and phosphorus slag powder with a mass ratio of 3:4:3.

[0093] Testing showed that the water contact angle of ordinary rubber powder was about 102°, indicating hydrophobicity. The water contact angle of the modified rubber powder prepared in this example was about 45°, indicating hydrophilicity. The contact angle was reduced by 57°, or 55.8%, compared to the unmodified rubber powder. This indicates that the introduction of hydrophilic groups such as -CO-, -OH, and -SO3H improves the hydrophilicity of the rubber powder, which is beneficial to enhancing the interfacial bonding ability between the rubber and concrete components.

[0094] Example 5

[0095] This embodiment includes the following steps:

[0096] Step 1: Sorting and crushing of waste rubber: crushing and separating the waste rubber to obtain rubber powder with a particle size of less than 16 mesh;

[0097] Step 2: Cleaning: Soak the rubber powder obtained in step 1 in clean water for 6 hours, and mechanically stir for 10 minutes every 3 hours, then remove it and soak it in 1.0 mol / L NaOH solution for 24 hours, and mechanically stir for 10 minutes every 4 hours, then wash it until it is neutral and dry it;

[0098] Step 3: Ultrasonic desulfurization and activation treatment: The rubber powder dried in step 2 is activated by an ultrasonic energy-focusing transducer at a frequency of 20 kHz for 20 minutes, and then aged in a dry environment for 10 hours to obtain desulfurized and activated rubber powder;

[0099] Step 4, preparation of hydrophilic rubber powder: the desulfurized activated rubber powder obtained in step 3 and the polyetherimide solution are mixed in a mass and volume ratio of 1100:400, the unit of mass is g, and the unit of volume is mL, wherein the mass of the polyetherimide is 2% of the mass of the desulfurized activated rubber powder, then heated to 60°C and stirred at a stirring speed of 170 rpm for 4 minutes, then added with a modifier and stirred for 50 minutes, and then the product is washed to obtain hydrophilic rubber powder; the modifier is acrylic acid, urea, sodium polystyrene sulfonate, ammonium persulfate, and mercaptopropionic acid; the amount of the modifier is such that: the mass of acrylic acid is 2 times the mass of the desulfurized activated rubber powder, the mass of urea is 1 times the mass of the desulfurized activated rubber powder, the mass of sodium polystyrene sulfonate is 70% of the mass of the desulfurized activated rubber powder, the mass of ammonium persulfate is 2% of the mass of the desulfurized activated rubber powder, and the mass of mercaptopropionic acid is 0.1% of the mass of the desulfurized activated rubber powder;

[0100] Step 5, inorganic encapsulation modification: The hydrophilic rubber powder obtained in step 4 and the inorganic modified admixture with a volume ratio of 3:1 are placed into an air flow stirring device, mixed and stirred for 10 minutes, and then aged for 24 hours to obtain modified rubber powder; the inorganic modified admixture is ultrafine silicon powder, metakaolin and phosphorus slag powder with a mass ratio of 2:4:3.

[0101] Example 6

[0102] This embodiment includes the following steps:

[0103] Step 1: Sorting and crushing of waste rubber: crushing and separating the waste rubber to obtain rubber powder with a particle size of less than 16 mesh;

[0104] Step 2: Cleaning: Soak the rubber powder obtained in step 1 in clean water for 8 hours, and mechanically stir for 10 minutes every 2 hours, then remove it and soak it in 2.0 mol / L NaOH solution for 24 hours, and mechanically stir for 10 minutes every 6 hours, then wash it until it is neutral and dry it;

[0105] Step 3: Ultrasonic desulfurization and activation treatment: The rubber powder dried in step 2 is activated using an ultrasonic energy-focusing transducer at a frequency of 30 kHz for 15 minutes, and then aged in a dry environment for 6 hours to obtain desulfurized and activated rubber powder;

[0106] Step 4, preparation of hydrophilic rubber powder: the desulfurized activated rubber powder obtained in step 3 and the polyetherimide solution are mixed in a mass and volume ratio of 900:200, the unit of mass is g, and the unit of volume is mL, wherein the mass of the polyetherimide is 1% of the mass of the desulfurized activated rubber powder, then heated to 100°C, and stirred at a stirring speed of 200 rpm for 2 minutes, then added with a modifier and stirred for 30 minutes, and then the product is washed to obtain hydrophilic rubber powder; the modifier is maleic anhydride, sodium methacrylic acid, sodium polystyrene sulfonate and mercaptopropionic acid; the amount of the modifier is such that: the mass of maleic anhydride is 1.5 times the mass of the desulfurized activated rubber powder, the mass of sodium methacrylic acid is 80% of the mass of the desulfurized activated rubber powder, the mass of sodium polystyrene sulfonate is 70% of the mass of the desulfurized activated rubber powder, and the mass of mercaptopropionic acid is 0.1% of the mass of the desulfurized activated rubber powder;

[0107] Step 5, inorganic encapsulation modification: The hydrophilic rubber powder obtained in step 4 and the inorganic modified admixture with a volume ratio of 5:1 are placed into an air flow stirring device, mixed and stirred for 20 minutes, and then aged for 24 hours to obtain modified rubber powder; the inorganic modified admixture is ultrafine silicon powder, metakaolin and phosphorus slag powder with a mass ratio of 3:3:4.

[0108] Example 7

[0109] This embodiment includes the following steps:

[0110] Step 1: 157 parts of water, 274 parts of cement, 91 parts of fly ash, 730 parts of sand, 1187 parts of crushed stone, 4.380 parts of water reducer, 0.531 parts of air entraining agent and 39 parts of modified rubber powder are mixed and poured into a mold, and then cured to obtain a modified rubber concrete prefabricated layer.

[0111] Example 8

[0112] This embodiment includes the following steps:

[0113] Step 1: Mix 157 parts of water, 274 parts of cement, 91 parts of fly ash, 692 parts of sand, 1187 parts of crushed stone, 4.380 parts of water reducer, 0.531 parts of air entraining agent and 77 parts of modified rubber powder to obtain modified rubber concrete, which is then poured into a mold and cured to obtain a modified rubber concrete prefabricated layer.

[0114] Example 9

[0115] This embodiment includes the following steps:

[0116] Step 1: Mix 157 parts of water, 274 parts of cement, 91 parts of fly ash, 654 parts of sand, 1187 parts of crushed stone, 4.380 parts of water reducer, 0.531 parts of air entraining agent and 115 parts of modified rubber powder to obtain modified rubber concrete, which is then poured into a mold and cured to obtain a modified rubber concrete prefabricated layer.

[0117] Comparative Example 1

[0118] This comparative example comprises the following steps:

[0119] Step 1: 157 parts of water, 274 parts of cement, 91 parts of fly ash, 769 parts of sand, 1187 parts of crushed stone, 4.380 parts of water reducer and 0.531 parts of air entraining agent are mixed to obtain rubber concrete, which is then poured into a mold and cured to obtain a rubber concrete prefabricated block.

[0120] The amounts of raw materials used in the modified rubber concrete prefabricated layers and rubber concrete prefabricated blocks in Examples 7, 8, 9 and Comparative Example 1 are shown in Table 1.

[0121] Table 1

[0122]

[0123] As can be seen from Table 1, the difference between Examples 7, 8, and 9 is the different amounts of modified rubber powder added, which replace 5%, 10%, and 15% of the mass of the sand, respectively. Comparative Example 1 is the benchmark group, in which no modified rubber powder is added.

[0124] The modified rubber concrete, modified rubber concrete prefabricated layer, rubber concrete, and rubber concrete prefabricated block in Examples 7, 8, 9 and Comparative Example 1 were tested. The test results are shown in Table 2.

[0125] Table 2

[0126]

[0127]

[0128] As can be seen from Table 2, the slump results of the modified rubber concrete prepared in Examples 7, 8, and 9 are 180±20 mm, which meets the design requirements. After the modified rubber powder is coated with the inorganic powder, the surface pores are filled, which greatly reduces its poor air entrainment effect and improves its shortcoming of being easy to float. The modified rubber powder has no adverse effect on the workability and air entrainment performance of the concrete.

[0129] In terms of mechanical properties: compared with comparative example 1, the compressive strength of Examples 7, 8, and 9 increased by 4.02%, 7.54%, and 1.45%, and the flexural strength increased by 13.80%, 31.03%, and 6.70%. With the increase of the modified rubber powder content, the compressive strength and flexural strength of the concrete both showed a trend of first increasing and then decreasing. This is because the modified rubber powder has a hydrophilic group and has good compatibility with cement-based materials. The inorganic powder coated on the surface can further improve the interface defects between the rubber powder and the concrete, thereby improving the mechanical properties of the concrete. When the modified rubber powder is added at 15%, the mechanical property improvement effect is not obvious; the elastic modulus is reduced by 5.07%, 6.76%, and 11.15%, indicating that the modified rubber powder can enhance the toughness and ductility of the concrete, and can improve the deformation resistance of the antifreeze and anti-seepage structure of the concrete channel to a certain extent.

[0130] In terms of durability: the anti-seepage grade is W14; anti-freeze performance: after 300 freeze-thaw cycles, the relative dynamic elastic modulus of Examples 7, 8, and 9 increased by 15.23%, 20.96%, and 11.59%, respectively, compared with Comparative Example 1; the mass decreased by 45.86%, 68.48%, and 42.63%, respectively; the anti-freeze performance of the modified rubber concrete is greatly improved, because the modified rubber powder, as an elastomer, can absorb the stress generated in the freeze-thaw cycle. When frost heave occurs, the modified rubber powder can deform and absorb part of the stress, which plays a buffering role and reduces the damage to the concrete caused by ice crystal formation in the freeze-thaw cycle, thereby reducing the cracking of the concrete caused by volume change, enhancing the toughness and ductility of the concrete, and can improve the deformation resistance of the concrete channel anti-freeze and anti-seepage structure to a certain extent.

[0131] Taking all performance and economic factors into consideration, a 10% replacement amount is the optimal dosage, that is, Example 8 is the optimal mix ratio.

[0132] Example 10

[0133] This embodiment includes the following steps:

[0134] Step 1: 155 parts of water, 292 parts of cement, 73 parts of fly ash, 685 parts of sand, 1180 parts of crushed stone, 4.198 parts of water reducer, 0.523 parts of air entraining agent and 45 parts of modified rubber powder are mixed and poured into a mold, and then cured to obtain a modified rubber concrete prefabricated layer.

[0135] Example 11

[0136] This embodiment includes the following steps:

[0137] Step 1: 153 parts of water, 281 parts of cement, 82 parts of fly ash, 710 parts of sand, 1190 parts of crushed stone, 4.445 parts of water reducer, 0.517 parts of air entraining agent and 93 parts of modified rubber powder are mixed and poured into a mold, and then cured to obtain a modified rubber concrete prefabricated layer.

[0138] Example 12

[0139] This embodiment includes the following steps:

[0140] Step 1: Survey and set out: Use a total station to survey and set out, ensuring that the points and lines on site are clear, stable, and convenient for construction, and check their accuracy regularly;

[0141] Step 2: Channel base surface treatment: Excavate the trapezoidal channel according to the measurement and layout in step 1. During the earthwork excavation, the 40cm protective layer reserved should be excavated to ensure the basic flatness of the slope. All tree roots, weeds and sharp stones should be removed during the protective layer excavation. During the base surface treatment, drainage facilities should be well prepared within the paving work range. For coarse gravel foundations, the foundation of the channel system building should be rolled and compacted with a roller, and the overall density should be not less than 0.6kg / m 3 For soil foundation, the original soil is compacted and the compaction degree reaches 0.8MPa. A section is set every 12m on the trimmed slope, and each section is marked with 3 points for elevation and pile number. The layout is denser at river bends, buildings and diameter change locations.

[0142] Step 3: Spread gravel cushion: Spread a 15cm thick gravel cushion in the trapezoidal channel excavated in step 2. Use qualified crushed stone for cushion construction. The designed paving volume is about 2.20m per linear meter. 3 Unload at the designated location. The cushion material should be laid upwards layer by layer from the bottom of the slope. Dumping along the slope is prohibited. After laying, necessary compaction should be carried out to ensure that it meets the requirements of the specifications. The next block construction should be carried out in time after the cushion layer has been laid. When working at negative temperatures, the crushed stone must not be frozen. Work should be stopped and covered on snowy days. After the snow, work must be cleared of snow and debris;

[0143] Step 4. Arrange anti-seepage and anti-clogging drainage and pressure relief device: Arrange anti-seepage and anti-clogging drainage and pressure relief device in the gravel cushion layer laid in step 3. The anti-seepage and anti-clogging drainage and pressure relief device consists of a drainage flower pipe, a connecting pressure plate, and an anti-clogging check valve (check valve body, link buckle, construction cover). Water is collected through the drainage flower pipe, connecting pressure plate and water-conducting geomembrane laid under the structural layer, and discharged through the anti-clogging check valve. The connecting pressure plate is a fastening connection and sealing structure when the drainage pipe passes through the geomembrane, which can The anti-seepage performance of the geomembrane penetration point is well guaranteed; two rows of staggered anti-seepage, anti-clogging, drainage and pressure relief devices are set on each side of the channel anti-freezing and anti-seepage structure, and a row of anti-seepage, anti-clogging, drainage and pressure relief devices is set in the middle of the channel bottom of the channel anti-freezing and anti-seepage structure, and the spacing between the anti-seepage, anti-clogging, drainage and pressure relief devices in the same row is 12m. On each side of the channel slope, one row of anti-seepage, anti-clogging, drainage and pressure relief devices is 55cm high from the slope foot, and the other row is 55cm below the normal water level of the channel;

[0144] Step 5. Laying and splicing one-way drainage composite geomembrane: Lay a 2mm thick one-way drainage composite geomembrane on the gravel cushion layer after arranging the anti-seepage, anti-clogging and drainage pressure relief device in step 4 and perform splicing. The geomembrane is laid from top to bottom, and the top of the slope is pressed with heavy objects to prevent slipping. Avoid strong pulling and tearing during laying, ensure that the geomembrane is laid flat and appropriately tight to ensure that it fits the slope surface flatly. The geotextile needs to be embedded in the foot guard and top pressure concrete, and is divided into three overlap sections, namely the foot guard section, the middle section and the top pressure section. The overlap of each section is not less than 10cm. The one-way drainage composite geomembrane is welded by hot melt welding. The fastening connection and sealing structure with the connecting pressure plate must be well done to ensure waterproofness. Mechanical rolling or human damage is prohibited during and after the process. Damage must be replaced or repaired immediately. After paving is completed, subsequent construction is carried out in time to avoid the geomembrane from being exposed to the sun for more than two days;

[0145] Step 6: Apply low-temperature phase change energy storage insulation mortar: Apply a 10cm thick low-temperature phase change energy storage insulation mortar on the one-way drainage composite geomembrane laid in step 5. After the construction is completed, when no liquid flows out on it, immediately cover it with plastic film and cover it with a layer of sack for curing. After curing for 3 days, proceed to the next step;

[0146] Step 7. Spreading the modified rubber concrete precast layer: First, apply a 2mm thick layer of M20 polymer cement-based waterproof leveling mortar evenly on the surface of the low-temperature phase change energy storage insulation mortar applied in step 6 to ensure the flatness and waterproof performance of the base layer. Then carry out measurement and layout work, accurately set a control section every 15m along the center line of the river channel, and set up control piles at key positions such as the foot guard, slope center and pressure top to provide a positioning basis for subsequent precise construction. Then, use a 10t truck crane to lift the 10.0cm thick modified rubber concrete precast layer onto the leveling mortar, and ensure close fit between the blocks through manual paving. The bonding also uses M20 polymer cement-based waterproof leveling mortar. The cross-section is designed to be an arc-bottom trapezoid with a slope angle of 70° and a slope ratio of 1:1.75. , when laying, start from the foot guard and proceed from bottom to top, use the tension line to strictly control the slope from the foot guard to the top of the pressure to ensure the accuracy of the starting slope, in the special parts such as river bends and anchor beams, adopt the staggered connection method of laying the outer layer first and then the inner layer to avoid the appearance of through seams and maintain the flatness and beauty of the overall structure, in the process of laying prefabricated blocks, the longitudinal and transverse gaps need to be controlled within the range of 5mm to 7mm, ensuring that the flatness per meter does not exceed 5mm, for special parts such as anti-seepage, anti-clogging and drainage and pressure relief devices, additional waterproofing treatment is required, and polyvinyl chloride putty is filled to enhance the waterproof effect, in order to prevent the channel concrete structure from cracking due to temperature stress, a 2cm to 3cm wide expansion joint is set every 6m, and the seam is filled with polyvinyl chloride putty to ensure the stability and durability of the entire structure;

[0147] Step 8. Surface inspection and anti-seepage treatment: Inspect the surface cracks and bonding joints of the modified rubber concrete precast layer paved in Step 7, and apply polyvinyl chloride putty to the defective areas to ensure the integrity of the entire structure and improve anti-seepage and waterproofing properties;

[0148] Step 9. Maintenance and acceptance: The structure coated with polyvinyl chloride mortar in step 8 is maintained for 28 days, and then the external dimensions, contour straightness, surface flatness, longitudinal slope of the channel bottom centerline, channel slope and channel bottom lining appearance, expansion joints, structural joints and other factors are inspected to obtain a channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete.

[0149] Example 13

[0150] The difference between this embodiment and Example 12 is that the thickness of the gravel cushion layer is 10 cm, the thickness of the one-way drainage composite geomembrane is 3 mm, the thickness of the low-temperature phase change energy storage insulation mortar is 6 cm, the thickness of the leveling mortar is 3 mm, and the thickness of the modified rubber concrete precast layer is 7.0 cm; and the spacing between the anti-seepage and anti-siltation drainage and pressure relief devices in the same row is 10 m, and one row of anti-seepage and anti-siltation drainage and pressure relief devices on each side of the channel slope is 60 cm high from the slope foot, and the other row is 50 cm below the normal water level of the channel.

[0151] Example 14

[0152] The difference between this embodiment and Example 12 is that the thickness of the gravel cushion layer is 20 cm, the thickness of the one-way drainage composite geomembrane is 2.5 mm, the thickness of the low-temperature phase change energy storage insulation mortar is 8 cm, the thickness of the leveling mortar is 2.5 mm, and the thickness of the modified rubber concrete precast layer is 9.0 cm; and the spacing between the anti-seepage and anti-siltation drainage and pressure relief devices in the same row is 15 m, and one row of anti-seepage and anti-siltation drainage and pressure relief devices on each side of the channel slope is 50 cm high from the slope foot, and the other row is 60 cm below the normal water level of the channel.

[0153] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent variation made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete, characterized in that: The channel antifreeze and anti-seepage structure has an arc-bottom trapezoidal cross-section and includes five layers: a gravel cushion layer, a one-way drainage composite geomembrane, a low-temperature phase-change energy storage and thermal insulation mortar, a leveling mortar, and a modified rubber concrete precast layer. Multiple rows of anti-seepage, anti-clogging, drainage, and pressure relief devices are installed throughout the channel antifreeze and anti-seepage structure. The modified rubber concrete prefabricated layer is made of the following components in parts by mass: 153-157 parts of water, 274-292 parts of cement, 73-91 parts of fly ash, 654-730 parts of sand, 1180-1190 parts of crushed stone, 4.198-4.445 parts of water reducer, 0.517-0.531 parts of air entraining agent and 39-115 parts of modified rubber powder; The preparation method of the modified rubber powder comprises the following steps: Step 1: Sorting and crushing of waste rubber: crushing and separating the waste rubber to obtain rubber powder with a particle size of less than 16 mesh; Step 2: Cleaning: Soak the rubber powder obtained in step 1 in clean water for 6 to 8 hours, and mechanically stir for 10 minutes every 2 to 3 hours. Then, remove it and soak it in 1.0 mol / L to 2.0 mol / L NaOH solution for 24 hours, and mechanically stir for 10 minutes every 4 to 6 hours. Then, wash it until it is neutral and dry it. Step 3: Ultrasonic desulfurization and activation treatment: The rubber powder dried in step 2 is activated by an ultrasonic energy-focusing transducer at a frequency of 20 kHz to 50 kHz for 10 to 20 minutes, and then aged in a dry environment for 6 to 10 hours to obtain desulfurized and activated rubber powder; Step 4, preparing hydrophilic rubber powder: mixing the desulfurized activated rubber powder obtained in step 3 with a dispersant solution in a mass and volume ratio of 900-1100:200-400, where the mass is in g and the volume is in mL, wherein the mass of the dispersant is 1%-3% of the mass of the desulfurized activated rubber powder, then heating to 60°C-100°C and stirring at a speed of 150 rpm-200 rpm for 2 min-5 min, then adding a modifier and stirring for 30 min-50 min, and then washing the product to obtain hydrophilic rubber powder; the modifier is three or more of maleic anhydride, acrylic acid, sodium methacrylic acid, urea, sodium polystyrene sulfonate, ammonium persulfate, and mercaptopropionic acid; Step 5, inorganic encapsulation modification: The hydrophilic rubber powder obtained in step 4 and the inorganic modified admixture with a volume ratio of 3~5:1 are placed into an air flow stirring device, mixed and stirred for 10min~20min, and then aged for 24h to obtain modified rubber powder; the inorganic modified admixture is ultrafine silicon powder, metakaolin and phosphorus slag powder with a mass ratio of 2~3:3~4:3~4.

2. The channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete according to claim 1, characterized in that: The thickness of the gravel cushion layer is 10cm~20cm, the thickness of the one-way drainage composite geomembrane is 2mm~3mm, the thickness of the low-temperature phase change energy storage insulation mortar is 6cm~10cm, the thickness of the leveling mortar is 2mm~3mm, the thickness of the modified rubber concrete prefabricated layer is 7.0cm~10.0cm, and the modified rubber concrete prefabricated layer includes channel slope prefabricated blocks arranged on the channel slope and arc-shaped channel bottom prefabricated blocks arranged on the channel bottom; two rows of staggered anti-seepage, anti-siltation and drainage and pressure relief devices are arranged on each side of the channel slope of the channel anti-freezing and anti-seepage structure, and a row of anti-seepage, anti-siltation and drainage and pressure relief devices is arranged in the middle part of the channel bottom of the channel anti-freezing and anti-seepage structure, and the spacing between the anti-seepage, anti-siltation and drainage and pressure relief devices in the same row is 10m~15m, and one row of anti-seepage, anti-siltation and drainage and pressure relief devices on each side of the channel slope is 50cm~60cm high from the slope foot, and the other row is 50cm~60cm below the normal water level of the channel.

3. The channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete according to claim 1, characterized in that: The preparation method of the low-temperature phase-change energy storage thermal insulation mortar comprises the following steps: Step 1: preparing calcined expanded perlite: calcining the expanded perlite in stages to obtain calcined expanded perlite; Step 2: preparing a composite phase change energy storage material: heating glycerol, KCl, Al(NO3)3 and H2O in a water bath and blending them, then adding SrCl2 as a nucleating agent and performing ultrasonic dispersion to obtain a composite phase change energy storage material; Step 3: preparing phase-change expanded perlite: pouring the composite phase-change energy storage material obtained in step 2 into a suction flask and heating it in a water bath, then pouring the calcined expanded perlite obtained in step 1 into the suction flask, evacuating the suction flask, and finally cooling it at room temperature to obtain phase-change expanded perlite; Step 4, surface treatment of the vitrified microspheres and the phase-change expanded perlite: the vitrified microspheres and the phase-change expanded perlite obtained in step 3 are placed in a blender for stirring, and while stirring, the silane coupling agent is evenly sprayed on the surfaces of the phase-change expanded perlite and the vitrified microspheres through an ultrasonic atomizing nozzle. After the spraying is completed, the sprayed vitrified microspheres and the phase-change expanded perlite are taken out and placed in a desiccator for aging, respectively, to obtain surface-treated vitrified microspheres and surface-treated phase-change expanded perlite, respectively. Step 5. Preparation of low-temperature phase-change energy storage and thermal insulation mortar: put the glue powder and water into a zero-gravity mixer and stir for more than 60 seconds, then add the surface-treated vitrified microspheres and surface-treated phase-change expanded perlite obtained in step 4 at a speed of 40 rpm to 60 rpm, stir for 3 min to 5 min, and obtain a low-temperature phase-change energy storage and thermal insulation mortar with a consistency of 70 mm to 90 mm; the low-temperature phase-change energy storage and thermal insulation mortar is composed of the following components in parts by mass: glue powder The invention relates to a method for preparing a rubber powder comprising the following steps: preparing the rubber powder; preparing the rubber powder; preparing the rubber powder; and producing the rubber powder; the rubber powder comprises 170-180 parts of surface-treated glass microspheres and surface-treated phase-change expanded perlite; the rubber powder comprises 120-130 parts of surface-treated glass microspheres and surface-treated phase-change expanded perlite; the mass ratio of water to rubber powder is 0.7-0.9:1; the volume ratio of the surface-treated glass microspheres to the surface-treated phase-change expanded perlite is 6-7:3-4; the rubber powder is composed of the following components in parts by mass: 136-144 parts of cement, 25.5-27 parts of fly ash, 8.5-9 parts of slaked lime, 1.36-1.44 parts of Wacker latex powder 4015N, 0.34-0.36 parts of hydroxypropyl methylcellulose, 0.136-0.144 parts of triethanolamine, 0.34-0.36 parts of sodium methyl siliconate, and 0.7-1.0 parts of polypropylene fiber.

4. The channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete according to claim 3, characterized in that: The staged calcination process in step 1 is as follows: heating to 400°C at a heating rate of 10°C / min~20°C / min and keeping warm for 0.5h~1h, then heating to 800°C at a heating rate of 10°C / min~20°C / min and keeping warm for 0.5h~1h, then heating to 850°C~1000°C at a heating rate of 5°C / min~10°C / min and keeping warm for 1h~2h, and finally cooling to room temperature.

5. The channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete according to claim 3, characterized in that: The mass ratio of glycerol, KCl, Al(NO3)3 and H2O in step 2 is 1~1.5:1.0~1.5:2.0~2.5:4.5~5.8, the amount of SrCl2 added is 1%~2% of the total mass of glycerol, KCl, Al(NO3)3 and H2O, the temperature of the water bath heating blending is 50℃~60℃, and the time of the ultrasonic dispersion is 0.5h~1h.

6. The channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete according to claim 3, characterized in that: The water bath heating temperature in step 3 is 50° C. to 60° C., the vacuuming pressure is -0.05 MPa to -0.07 MPa, the time is 10 min to 20 min, and the cooling time is more than 24 h.

7. The channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete according to claim 3, characterized in that: In step 4, the stirring speed is 40 rpm to 60 rpm, the time is 3 min to 5 min, the silane coupling agent is KH550 or KH570, and the aging time is more than 48 h.

8. A construction method for a channel antifreeze and anti-seepage structure containing a phase change insulation material and modified rubber concrete as claimed in claim 1 or 2, characterized in that: The method comprises the following steps: Step 1: Measure and set out: Use a total station to measure and set out; Step 2: Channel base surface treatment: excavate the trapezoidal channel according to the measurement and layout in step 1; Step 3: Lay the gravel cushion layer: Lay the gravel cushion layer in the trapezoidal channel excavated in step 2; Step 4: Arrange anti-seepage, anti-clogging, drainage and pressure relief devices: Arrange anti-seepage, anti-clogging, drainage and pressure relief devices in the gravel cushion layer laid in step 3; Step 5: Laying and splicing one-way drainage composite geomembrane: Laying and splicing one-way drainage composite geomembrane on the gravel cushion layer after the anti-seepage, anti-clogging and drainage pressure relief device is arranged in step 4; Step 6: Apply low-temperature phase-change energy storage thermal insulation mortar: Apply low-temperature phase-change energy storage thermal insulation mortar on the spliced ​​one-way drainage composite geomembrane laid in step 5; Step 7: Spreading a prefabricated layer of modified rubber concrete, applying leveling mortar on the low-temperature phase change energy storage insulation mortar applied in step 6, and then spreading the prefabricated layer of modified rubber concrete on the leveling mortar; Step 8: Surface inspection and anti-seepage treatment: Inspect the modified rubber concrete precast layer paved in step 7 and apply polyvinyl chloride putty to the defective parts; Step 9, maintenance and acceptance: the structure coated with polyvinyl chloride mortar in step 8 is maintained and then inspected to obtain a channel antifreeze and anti-seepage structure containing phase change insulation material and modified rubber concrete.

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