Special high-strength elastic mortar for expansion joints of roads and bridges and preparation method of special high-strength elastic mortar

Abstract

The invention discloses special high-strength elastic mortar for expansion joints of roads and bridges and a preparation method of the special high-strength elastic mortar, and relates to the technical field of building materials, the special high-strength elastic mortar comprises quick-hardening sulphoaluminate, ordinary Portland cement, natural quartz sand, rubber particles and additives, the invention has the following advantages: by accurately controlling the ratio of the quick-hardening sulphoaluminate to the ordinary Portland cement, a foundation for quickly forming strength can be provided for the mortar, the natural quartz sand is reasonable in proportion, the compactness of the mortar can be enhanced, the binding force between the rubber particles and the mortar is enhanced after the rubber particles are subjected to special treatment and surface modification, and the strength of the mortar is improved. The toughness and elasticity of the mortar are improved, the water reducing agent in the additive can reduce the water consumption and improve the compactness and strength of the mortar, the water-retaining agent can maintain the moisture in the mortar and promote the hydration reaction of cement, and the construction quality and the service life of a road are ensured through the synergistic effect of the material characteristics and the process; therefore, the traffic requirement can be met in a short time, and the influence on traffic is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, in particular to a high-strength elastic mortar specially used for expansion joints of highways and bridges and a preparation method thereof. Background Art

[0002] Highways and bridges are important infrastructure for transportation. Their safe and stable operation is crucial to economic development and people's lives. Expansion joints are an important part of highway and bridge structures. Their function is to adapt to the deformation of bridges caused by temperature changes, vehicle loads and other factors, and ensure the structural safety of bridges.

[0003] The mortar prepared by the existing technology has certain defects. First, the mortar strength is formed slowly and the material gradation is unreasonable, which affects the construction quality and road life and causes long traffic control time. Secondly, the elasticity is poor and the expansion performance is limited, which cannot adapt well to the frequent deformation of bridge expansion joints. Furthermore, the existing technology is exposed to the natural environment for a long time. The existing expansion joint mortar is easily affected by factors such as ultraviolet rays, temperature changes, and rain erosion, resulting in accelerated aging and gradual decline in performance. For this reason, we propose a high-strength elastic mortar specially used for highway and bridge expansion joints and a preparation method thereof. Summary of the invention

[0004] The purpose of the present invention is to provide a high-strength elastic mortar specially used for expansion joints of highways and bridges and a preparation method thereof.

[0005] In order to solve the problems raised in the above background technology, the present invention provides the following technical solutions: a method for preparing a high-strength elastic mortar for expansion joints of highways and bridges, wherein the raw materials of the high-strength elastic mortar include fast-hardening sulphoaluminate, ordinary silicate cement, natural quartz sand, rubber particles and additives, and the method for preparing the high-strength elastic mortar specifically includes the following steps:

[0006] Step 1: Put 300-350 parts of rapid hardening sulphoaluminate and 100-150 parts of ordinary Portland cement into a mixer, add 100-130 parts of water, and stir at a speed of 80r / min for 15 minutes to fully mix and form a basic cementitious material. During the stirring process, ensure that the stirring blades of the mixer are evenly distributed;

[0007] Step 2: Add 450-550 parts of natural quartz sand to the basic cementitious material, stir at a speed of 60r / min for 10 minutes to fully blend the quartz sand with the cementitious material. When stirring, pay attention to the state of the mixture to ensure that the quartz sand is evenly distributed in the cementitious material. The mixture should be uniform, non-lumpy, and have a certain fluidity;

[0008] Step 3: Add 15-50 parts of specially treated rubber particles, continue stirring at a speed of 50r / min for 8 minutes to ensure that the rubber particles are evenly dispersed in the mixture. Before adding the rubber particles, the surface of the rubber particles needs to be modified to enhance its bonding with the mortar and improve the elasticity of the mortar.

[0009] Step 4: Add 2 parts of additives, including 0.5 parts of water reducing agent PC-100, 0.7 parts of water retaining agent HPMC400, 0.1 parts of defoaming agent PF-07, 0.2 parts of setting agent (GL-GF), 0.3 parts of expansion agent (GL-UEA), 0.1 parts of copper-plated microwires and 0.1 parts of anti-aging agent. After all the additives are added, stir at a speed of 70r / min for 12 minutes to fully mix them to obtain pre-high-strength elastic mortar;

[0010] Step 5: Pour the pre-high-strength elastic mortar after mixing into the mold, demold the mortar after it is set, put the demolded mortar into a drying room for drying, grind the dried mortar using a grinder to grind it into particles with a particle size of 100μm-200μm, and finally, package the ground granular mortar to obtain high-strength elastic mortar.

[0011] As a further solution of the present invention: in the step 1, after the stirring is completed, the basic cementitious material needs to be tested for quality. The test items include performance indicators of setting time and strength. The setting time should be within 30-60 minutes, and the strength should reach 20MPa-30MPa. Only after the test is qualified can the operation of step 2 be carried out. During the stirring process, it is also necessary to pay attention to observe the stirring state to ensure that there is no uneven stirring and caking.

[0012] As a further solution of the present invention: in the step 2, when adding quartz sand, it should be added slowly and evenly, 50-60 parts per minute, to avoid adding too much at one time resulting in uneven stirring. After the stirring is completed, the mixture is sampled and tested to ensure that the fluidity of the mixture is between 150mm-180mm.

[0013] As a further solution of the present invention: in the step 3, the special treatment of the rubber particles includes: placing the rubber particles in a cleaning device, rinsing with clean water for 10 minutes to remove surface impurities, and then soaking the rubber particles in a solution containing a surfactant, sodium dodecylbenzene sulfonate, for 2 hours to perform surface activation treatment, and then taking out the rubber particles, placing them in a drying oven, and drying them for 3 hours at a temperature of 80° C. and a relative humidity of 30%. During the drying process, it is necessary to control the temperature and humidity of the drying oven to avoid excessive drying and moisture of the rubber particles.

[0014] As a further solution of the present invention: in the step 4, first, add 0.5 parts of water reducing agent PC-100 and 0.7 parts of water retaining agent HPMC400, set the mixer speed to 70r / min, stir for 3 minutes, add 0.08 parts of defoaming agent PF-07 after the stirring is completed, and continue stirring for 2 minutes at the same speed to eliminate bubbles generated during the stirring process, then add 0.2 parts of setting agent (GL-GF), stir for 2 minutes, then add 0.3 parts of expansion agent (GL-UEA), continue stirring for 3 minutes, and finally, add 0.1 parts of antioxidant, the antioxidant is antioxidant 168 (tris [2.4-di-tert-butylphenyl] phosphite), stir for 2 minutes to fully mix it to ensure that the various properties of the mortar are effectively adjusted.

[0015] As a further solution of the present invention: in the step five, the pre-high-strength elastic mortar is poured into a mold, cured for 24 hours in an environment with a temperature of 25°C and a humidity of 60%, and then demolded. After demolding, it is placed in a drying room and dried for 12 hours at a temperature of 60°C. After drying, it is ground using a grinder to grind it into particles with a particle size of 100μm-200μm. After grinding, the mortar is sieved through a sieve with a pore size of 200μm to remove excessively large particles.

[0016] As a further solution of the present invention: after grinding and screening in step five, the high-strength elastic mortar is packaged in sealed plastic bags. Before packaging, the plastic bags need to be cleaned and dried to ensure that there are no impurities and moisture residues. When packaging, the mortar is slowly poured into the plastic bag to avoid bubbles and gaps, and then sealed with a sealing machine.

[0017] As a further solution of the present invention: in the steps 1 to 5, the order of adding all raw materials and the stirring time must be strictly controlled, the mixer adopts a double-shaft forced stirring device, and the speed change of the stirring shaft should conform to the curve speed change to ensure that the various components of the mortar are fully mixed and evenly without destroying their performance.

[0018] In addition, the present invention also provides a high-strength elastic mortar specially used for expansion joints of highways and bridges. The main preparation materials of the high-strength elastic mortar are fast-hardening sulphoaluminate, ordinary silicate cement, natural quartz sand, rubber particles and additives.

[0019] By adopting the above technical solution, compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The present invention can provide a basis for the mortar to quickly form strength by accurately controlling the ratio of fast-hardening sulphoaluminate and ordinary silicate cement. The reasonable ratio of natural quartz sand can enhance the compactness of the mortar. After special treatment and surface modification, the rubber particles have enhanced bonding with the mortar, thereby improving the toughness and elasticity of the mortar. The water reducer in the additive can reduce the amount of water used and improve the compactness and strength of the mortar. The water retaining agent can retain the moisture in the mortar and promote the hydration reaction of the cement. The setting agent can adjust the setting time of the cement to ensure that the mortar quickly forms strength at an early stage. The expansion agent can compensate for the shrinkage of the mortar and improve its volume stability. The curing and drying temperature of the mortar is accurately controlled, which is beneficial to the formation of the internal structure of the mortar, thereby enabling it to reach the traffic strength faster. The synergistic effect of these material properties and processes ensures the construction quality and the service life of the road, so that it can meet the traffic requirements in a short time and reduce the impact on traffic.

[0021] 2. The present invention performs special treatment and surface modification on rubber particles, washes, performs surface activation treatment and dries the rubber particles, thereby enhancing the bonding force between the rubber particles and the mortar, thereby improving the elasticity of the mortar. At the same time, during the preparation process, the addition order and stirring time of each component are controlled to uniformly disperse the rubber particles in the mixture, further improving the elasticity of the mortar. This high elasticity helps to reduce deformation and damage of expansion joints during use, and improves the flatness and driving comfort of the road.

[0022] 3. The present invention adds an anti-aging agent to the additive, and the anti-aging agent is antioxidant 168 (tris[2.4-di-tert-butylphenyl]phosphite), which can effectively improve the anti-aging performance of the mortar and extend the service life. In addition, during the preparation process, the temperature, humidity and other conditions of each link are strictly controlled, and the high-strength elastic material is maintained under a specific temperature and humidity environment, thereby ensuring the stability of the performance of the rubber particles and the anti-aging agent material, reducing the decline in mortar performance caused by aging, and enabling the high-strength elastic mortar to maintain good performance during long-term use, thereby significantly reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the method steps in an embodiment of the present invention;

[0024] Figure 2 The construction effect of the embodiment of the present invention is shown in FIG. Figure 1 ;

[0025] Figure 3 The construction effect of the embodiment of the present invention is shown in FIG. Figure 2 ;

[0026] Figure 4 The construction effect of the embodiment of the present invention is shown in FIG. Figure 3 . DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0028] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] Embodiment 1:

[0030] Highways and bridges are important infrastructure for transportation. Their safe and stable operation is crucial to economic development and people's lives. Expansion joints are an important part of highway and bridge structures. Their function is to adapt to the deformation of bridges caused by temperature changes, vehicle loads and other factors, and ensure the structural safety of bridges.

[0031] The mortar prepared by the existing technology has certain defects. First, the mortar strength is formed slowly and the material gradation is unreasonable, which affects the construction quality and road life and causes long traffic control time. Secondly, the elasticity is poor and the expansion performance is limited, which cannot adapt well to the frequent deformation of bridge expansion joints. Furthermore, the existing technology is exposed to the natural environment for a long time. The existing expansion joint mortar is easily affected by factors such as ultraviolet rays, temperature changes, and rain erosion, resulting in accelerated aging and gradual decline in performance. For this reason, we propose a high-strength elastic mortar specially used for highway and bridge expansion joints and a preparation method thereof.

[0032] Therefore, in order to effectively solve the above problems, the present application proposes a high-strength elastic mortar for highway and bridge expansion joints and a preparation method thereof, as shown in the attached drawings of the specification. Figure 1 -Attached Figure 4 As shown, the raw materials of the preparation method of high-strength elastic mortar include fast-hardening sulphoaluminate, ordinary Portland cement, natural quartz sand, rubber particles and additives. The preparation method of high-strength elastic mortar specifically includes the following steps:

[0033] Step 1: Put 350 parts of rapid hardening sulphoaluminate and 130 parts of ordinary Portland cement into a mixer, add 120 parts of water, and stir at a speed of 80r / min for 15 minutes to fully mix them and form a basic cementitious material. During the stirring process, ensure that the stirring blades of the mixer are evenly distributed;

[0034] Step 2: Add 500 parts of natural quartz sand to the basic cementitious material, stir at a speed of 60r / min for 10 minutes to fully blend the quartz sand with the cementitious material. When stirring, pay attention to the state of the mixture to ensure that the quartz sand is evenly distributed in the cementitious material. The mixture should be uniform, non-lumpy, and have a certain fluidity;

[0035] Step 3: Add 40 parts of specially treated rubber particles and continue stirring at a speed of 50r / min for 8 minutes to ensure that the rubber particles are evenly dispersed in the mixture. Before adding the rubber particles, the surface of the rubber particles needs to be modified to enhance its bonding strength with the mortar and improve the elasticity of the mortar.

[0036] Step 4: Add 2 parts of additives, including 0.5 parts of water reducing agent PC-100, 0.7 parts of water retaining agent HPMC400, 0.1 parts of defoaming agent PF-07, 0.2 parts of setting agent (GL-GF), 0.3 parts of expansion agent (GL-UEA), 0.1 parts of copper-plated microwires and 0.1 parts of anti-aging agent. After all the additives are added, stir at a speed of 70r / min for 12 minutes to fully mix them to obtain pre-high-strength elastic mortar;

[0037] Step 5: Pour the pre-high-strength elastic mortar after mixing into the mold, demold the mortar after it is set, put the demolded mortar into a drying room for drying, grind the dried mortar using a grinder to grind it into particles with a particle size of 100μm-200μm, and finally, package the ground granular mortar to obtain high-strength elastic mortar.

[0038] Specific work flow: First, put 350 parts of fast-hardening sulphoaluminate and 130 parts of ordinary Portland cement into a mixer, add 120 parts of water, and stir at a speed of 80r / min for 15 minutes to fully mix the two and form a basic cementitious material. During the mixing process, ensure that the mixing blades of the mixer are evenly distributed. Next, add 500 parts of natural quartz sand to the basic cementitious material and stir at a speed of 60r / min for 10 minutes to allow the quartz sand to fully blend with the cementitious material. Pay attention to the state of the mixture during mixing to ensure that the quartz sand is evenly distributed and the mixture is uniform, free of lumps and has a certain fluidity. Then, add 40 parts of specially treated rubber particles and continue to stir at a speed of 50r / min for 8 minutes to ensure that the rubber particles are evenly dispersed in the mixture. After that, add 2 parts of additives , including 0.5 parts of water reducing agent PC-100, 0.7 parts of water retaining agent HPMC400, 0.1 parts of defoaming agent PF-07, 0.2 parts of setting agent (GL-GF), 0.3 parts of expansion agent (GL-UEA), 0.1 parts of copper-plated microwires and 0.1 parts of anti-aging agent. After all are added, stir at a speed of 70r / min for 12 minutes to fully mix them to obtain pre-high-strength elastic mortar. Finally, pour the stirred pre-high-strength elastic mortar into a mold, and carry out subsequent shaping, demoulding, drying, grinding and packaging to finally obtain high-strength elastic mortar;

[0039] Furthermore, the ratio of fast-hardening sulphoaluminate to ordinary Portland cement is controlled to lay the foundation for the rapid strength formation of the mortar. The natural quartz sand is reasonably proportioned to enhance the density of the mortar. After special treatment and surface modification, the rubber particles have enhanced bonding with the mortar, improving toughness and elasticity. The water reducer in the additive reduces water consumption and improves density and strength. The water retaining agent retains moisture and promotes cement hydration reaction. The setting agent adjusts the setting time to ensure rapid early strength formation. The expansion agent compensates for shrinkage and improves volume stability. At the same time, the mortar maintenance and drying temperature are precisely controlled to facilitate the formation of the internal structure, so that it can reach the traffic strength faster, ensure construction quality and road service life, shorten traffic time, and reduce traffic impact.

[0040] Embodiment 2:

[0041] Based on the first embodiment, as shown in the accompanying drawings of the specification Figure 1 -Attached Figure 4 As shown, in step 1, after the mixing is completed, the basic cementitious material needs to be tested for quality. The test items include the performance indicators of setting time and strength. The setting time should be within 30-60 minutes, and the strength should reach 20MPa-30MPa. Only after the test is qualified can the operation of step 2 be carried out. During the mixing process, it is also necessary to pay attention to observe the mixing state to ensure that there is no uneven mixing and agglomeration.

[0042] In step 2, when adding quartz sand, it should be added slowly and evenly, 50 parts per minute, to avoid adding too much at one time, which will cause uneven stirring. After stirring, the mixture is sampled and tested to ensure that the fluidity of the mixture is between 150mm-180mm;

[0043] In step 3, the special treatment of the rubber particles includes: placing the rubber particles in a cleaning device, washing with clean water for 10 minutes to remove surface impurities, and then soaking the rubber particles in a solution containing a surfactant, sodium dodecylbenzene sulfonate, for 2 hours to perform surface activation treatment, and then taking out the rubber particles, placing them in a drying oven, and drying them for 3 hours at a temperature of 80°C and a relative humidity of 30%. During the drying process, it is necessary to control the temperature and humidity of the drying oven to prevent the rubber particles from being over-dried and damp;

[0044] In step 4, first, add 0.5 parts of water reducing agent PC-100 and 0.7 parts of water retaining agent HPMC400, set the mixer speed to 70r / min, stir for 3 minutes, add 0.08 parts of defoaming agent PF-07 after stirring, continue stirring at the same speed for 2 minutes to eliminate bubbles generated during the stirring process, then add 0.2 parts of setting agent (GL-GF), stir for 2 minutes, then add 0.3 parts of expansion agent (GL-UEA), continue stirring for 3 minutes, finally, add 0.1 parts of anti-aging agent, stir for 2 minutes, mix them thoroughly to ensure that the properties of the mortar are effectively adjusted;

[0045] In step 5, the pre-high-strength elastic mortar is poured into a mold, cured for 24 hours at a temperature of 25° C. and a humidity of 60%, and then demolded. After demolding, it is placed in a drying room and dried at a temperature of 60° C. for 12 hours. After drying, it is ground using a grinder to grind it into particles with a particle size of 100 μm-200 μm. After grinding, the mortar is sieved through a 200 μm pore size sieve to remove oversized particles;

[0046] Specific work flow: After the basic cementitious material is prepared, it is necessary to conduct quality inspection on the basic cementitious material, including the inspection of performance indicators such as setting time and strength. After passing the inspection, proceed to the next step. At the same time, pay attention to the stirring state during the stirring process. During the inspection process, advanced testing equipment and methods can be used to improve the accuracy and efficiency of the inspection. An electron microscope can be used to observe the microstructure of the cementitious material to gain a deeper understanding of its performance. In addition, an intelligent monitoring system can be developed to monitor the state of the stirring process in real time, and to promptly discover and solve problems.

[0047] When adding quartz sand, add 50 parts per minute at a uniform and slow speed to avoid uneven stirring due to adding too much at one time. After stirring, sample the mixture to ensure that the fluidity of the mixture is between 150mm and 180mm. In order to more accurately control the speed of adding quartz sand, an automated feeding system can be used to feed according to a preset speed. When testing the fluidity of the mixture, a rheological test method can be introduced to more comprehensively evaluate the performance of the mixture. At the same time, the effect of quartz sand with different particle size distributions on the fluidity of the mixture can be studied to optimize the selection of quartz sand.

[0048] The special treatment of rubber particles includes steps such as cleaning, surface activation treatment and drying. Specifically, rinse with clean water for 10 minutes to remove surface impurities, then soak in a solution containing a surfactant for 2 hours for surface activation treatment, and then dry for 3 hours at 80°C and a relative humidity of 30%. During the drying process, pay attention to controlling the temperature and humidity to avoid excessive drying or moisture of the rubber particles. In the surface activation treatment of rubber particles, composite surface treatment technology can be used to further enhance the bonding force between rubber particles and mortar. During the drying process, intelligent drying equipment can be studied to adjust the drying parameters according to the real-time status of the rubber particles to improve the drying efficiency and quality. In addition, the particle size and shape of the rubber particles can be optimized according to demand to improve the performance of the mortar.

[0049] When adding additives, first add 0.5 parts of water reducing agent PC-100 and 0.7 parts of water retaining agent HPMC400, stir at 70r / min for 3 minutes, then add 0.08 parts of defoaming agent PF-07, continue stirring for 2 minutes to eliminate bubbles, then add 0.2 parts of setting agent (GL-GF), stir for 2 minutes, then add 0.3 parts of expansion agent (GL-UEA), continue stirring for 3 minutes, and finally add 0.1 parts of anti-aging agent, stir for 2 minutes, so that the properties of the mortar can be effectively adjusted. During the stirring process, variable frequency stirring technology can be used to adjust the stirring speed according to the needs of different stages to improve the stirring effect;

[0050] When pouring the pre-high-strength elastic mortar into the mold, it needs to be cured for 24 hours at 25°C and 60% humidity, and then demolded. After demolding, it is placed in a drying room at 60°C for 12 hours. After drying, it is ground into particles with a particle size of 100μm-200μm. Finally, the ground granular mortar is packaged. During the curing process, an intelligent curing system can be used to monitor and adjust the temperature and humidity in real time to ensure the stability of the curing environment. During the grinding and packaging process, automated equipment can be introduced to improve production efficiency and product quality stability.

[0051] Furthermore, by subjecting the rubber particles to special treatments and surface modifications such as cleaning, surface activation and drying, their bonding with the mortar is enhanced, thereby improving the elasticity of the mortar. During the preparation process, the order of adding the components and the stirring time are controlled so that the rubber particles are evenly dispersed in the mixture, further improving the elastic properties of the mortar. This high elasticity helps to reduce deformation and damage of expansion joints during use, and improves road smoothness and driving comfort.

[0052] Embodiment three:

[0053] Based on the second embodiment, as shown in the accompanying drawings of the specification Figure 1 -Attached Figure 4As shown, after grinding and screening in step five, the high-strength elastic mortar is packaged in sealed plastic bags. Before packaging, the plastic bags need to be cleaned and dried to ensure that there are no impurities and moisture residues. When packaging, the mortar is slowly poured into the plastic bag to avoid bubbles and gaps, and then sealed with a sealing machine. In steps one to five, the order of adding all raw materials and the mixing time must be strictly controlled. The mixer adopts a double-shaft forced mixing equipment, and the speed change of the mixing shaft should comply with the curve speed change to ensure that the components of the mortar are fully mixed and uniform without destroying their performance.

[0054] Specific work flow: After grinding and screening, the high-strength elastic mortar is packaged in sealed plastic bags. Before packaging, the plastic bags are cleaned and dried to ensure that there are no impurities and moisture residues. When packaging, the mortar is slowly poured into the plastic bag to avoid bubbles and gaps, and then sealed with a sealing machine. In this process, advanced packaging equipment, such as vacuum packaging machines, can be introduced to further improve the sealing of the packaging and extend the shelf life of the mortar. At the same time, research and develop degradable plastic bags to reduce the impact on the environment;

[0055] The order of adding all raw materials and the mixing time must be strictly controlled. The mixer uses a double-shaft forced mixing device. The speed change of the mixing shaft should comply with the curve speed change to ensure that the various components of the mortar are fully mixed and evenly without destroying its performance. The intelligent control system can be used to monitor and adjust the speed change of the mixing shaft in real time to make it more accurately meet the curve speed change requirements. At the same time, a new mixing blade design is used to improve mixing efficiency and uniformity. In addition, through data analysis and simulation experiments, the order of adding raw materials and the mixing time can be optimized to further improve the performance of the mortar.

[0056] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0057] Some aspects of the present application can be completely executed by hardware, can be completely executed by software (including firmware, resident software, microcode, etc.), or can be executed by a combination of hardware and software. The above hardware or software can all be referred to as "data blocks", "modules", "engines", "units", "components" or "systems". The processor can be one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DAPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, or combinations thereof. In addition, various aspects of the present application may be expressed as computer products located in one or more computer-readable media, which include computer-readable program codes. For example, computer-readable media may include, but are not limited to, magnetic storage devices (e.g., hard disks, floppy disks, tapes...), optical disks (e.g., compact disks CDs, digital versatile disks DVDs...), smart cards, and flash memory devices (e.g., cards, sticks, key drives...).

[0058] A computer-readable medium may include a propagated data signal containing computer program code, such as in baseband or as part of a carrier wave. The propagated signal may have a variety of manifestations, including electromagnetic, optical, etc., or a suitable combination. A computer-readable medium may be any computer-readable medium other than a computer-readable storage medium, which may be connected to an instruction execution system, device or apparatus to communicate, propagate or transmit a program for use. The program code on the computer-readable medium may be propagated through any suitable medium, including radio, cable, fiber optic cable, radio frequency signal, or similar medium, or a combination of any of the above mediums.

[0059] Similarly, it should be noted that in order to simplify the description disclosed in this application, so as to help understand one or more embodiments of the invention, in the above description of the embodiments of the present application, sometimes multiple features are merged into one embodiment, drawings or descriptions thereof. However, this disclosure method does not mean that the features required by the object of the present application are more than the features mentioned in the claims. In fact, the features of the embodiment are less than all the features of the single embodiment disclosed above. In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "approximately", "approximately" or "substantially" in some examples. Unless otherwise specified, "approximately", "approximately" or "substantially" indicate that the number allows a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining the digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, such numerical settings are as accurate as possible within the feasible range.

[0060] Although the present invention is disclosed as above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection defined by the claims of the present invention.

Claims

1. A method for preparing a high-strength elastic mortar for expansion joints of highways and bridges, characterized in that: The raw materials of the preparation method of the high-strength elastic mortar include fast-hardening sulphoaluminate, ordinary Portland cement, natural quartz sand, rubber particles and additives. The preparation method of the high-strength elastic mortar specifically includes the following steps: Step 1: Put 300-350 parts of rapid hardening sulphoaluminate and 100-150 parts of ordinary Portland cement into a mixer, add 100-130 parts of water, and stir at a speed of 80r / min for 15 minutes to fully mix and form a basic cementitious material. During the stirring process, ensure that the stirring blades of the mixer are evenly distributed; Step 2: Add 450-550 parts of natural quartz sand to the basic cementitious material, stir at a speed of 60r / min for 10 minutes to fully blend the quartz sand with the cementitious material. When stirring, pay attention to the state of the mixture to ensure that the quartz sand is evenly distributed in the cementitious material. The mixture should be uniform, non-lumpy, and have a certain fluidity; Step 3: Add 15-50 parts of specially treated rubber particles, continue stirring at a speed of 50r / min for 8 minutes to ensure that the rubber particles are evenly dispersed in the mixture. Before adding the rubber particles, the surface of the rubber particles needs to be modified to enhance its bonding with the mortar and improve the elasticity of the mortar. Step 4: Add 2 parts of additives, including 0.5 parts of water reducing agent PC-100, 0.7 parts of water retaining agent HPMC400, 0.1 parts of defoaming agent PF-07, 0.2 parts of setting agent (GL-GF), 0.3 parts of expansion agent (GL-UEA), 0.1 parts of copper-plated microwires and 0.1 parts of anti-aging agent. After all the additives are added, stir at a speed of 70r / min for 12 minutes to fully mix them to obtain pre-high-strength elastic mortar; Step 5: Pour the pre-high-strength elastic mortar after mixing into the mold, demold the mortar after it is set, put the demolded mortar into a drying room for drying, grind the dried mortar using a grinder to grind it into particles with a particle size of 100μm-200μm, and finally, package the ground granular mortar to obtain high-strength elastic mortar.

2. The method for preparing a high-strength elastic mortar for expansion joints of highways and bridges according to claim 1, characterized in that: In the step 1, after the stirring is completed, the basic cementitious material needs to be quality tested. The test items include the performance indicators of setting time and strength. The setting time should be within 30-60 minutes, and the strength should reach 20MPa-30MPa. Only after the test is qualified can the operation of step 2 be carried out. During the stirring process, it is also necessary to pay attention to observe the stirring state to ensure that there is no uneven stirring and caking.

3. The method for preparing a high-strength elastic mortar for expansion joints of highways and bridges according to claim 1, characterized in that: In the step 2, when adding quartz sand, it should be added slowly and evenly, 50-60 parts per minute, to avoid adding too much at one time resulting in uneven stirring. After stirring, the mixture is sampled and tested to ensure that the fluidity of the mixture is between 150mm-180mm.

4. The method for preparing a high-strength elastic mortar for expansion joints of highways and bridges according to claim 1, characterized in that: In the step 3, the special treatment of the rubber particles includes: placing the rubber particles in a cleaning device, rinsing with clean water for 10 minutes to remove surface impurities, and then soaking the rubber particles in a solution containing a surfactant, sodium dodecylbenzene sulfonate, for 2 hours to perform surface activation treatment, and then taking out the rubber particles, placing them in a drying oven, and drying them for 3 hours at a temperature of 80° C. and a relative humidity of 30%. During the drying process, it is necessary to control the temperature and humidity of the drying oven to avoid excessive drying and moisture of the rubber particles.

5. The method for preparing a high-strength elastic mortar for expansion joints of highways and bridges according to claim 1, characterized in that: In the step 4, first, add 0.5 parts of water reducing agent PC-100 and 0.7 parts of water retaining agent HPMC400, set the mixer speed to 70r / min, stir for 3 minutes, add 0.08 parts of defoaming agent PF-07 after the stirring is completed, and continue stirring for 2 minutes at the same speed to eliminate bubbles generated during the stirring process, then add 0.2 parts of setting agent (GL-GF), stir for 2 minutes, then add 0.3 parts of expansion agent (GL-UEA), continue stirring for 3 minutes, and finally, add 0.1 parts of antioxidant, the antioxidant is antioxidant 168 (tris [2.4-di-tert-butylphenyl] phosphite), stir for 2 minutes to fully mix it to ensure that the various properties of the mortar are effectively adjusted.

6. The method for preparing a high-strength elastic mortar for expansion joints of highways and bridges according to claim 1, characterized in that: In the step five, the pre-high-strength elastic mortar is poured into a mold, cured for 24 hours at a temperature of 25°C and a humidity of 60%, and then demolded. After demolding, it is placed in a drying room and dried at a temperature of 60°C for 12 hours. After drying, it is ground using a grinder to grind it into particles with a particle size of 100μm-200μm. After grinding, the mortar is sieved through a sieve with an aperture of 200μm to remove excessively large particles.

7. The method for preparing a high-strength elastic mortar for expansion joints of highways and bridges according to claim 6, characterized in that: After grinding and screening in step five, the high-strength elastic mortar is packaged in sealed plastic bags. Before packaging, the plastic bags need to be cleaned and dried to ensure that there are no impurities and moisture residues. When packaging, the mortar is slowly poured into the plastic bag to avoid bubbles and gaps, and then sealed with a sealing machine.

8. The method for preparing a high-strength elastic mortar for expansion joints of highways and bridges according to claim 1, characterized in that: In steps 1 to 5, the order of adding all raw materials and the mixing time must be strictly controlled. The mixer adopts a double-shaft forced mixing device, and the speed change of the mixing shaft should conform to the curve speed change to ensure that the various components of the mortar are fully mixed and evenly without destroying their performance.

9. A high-strength elastic mortar for expansion joints of highways and bridges applicable to the method for preparing the high-strength elastic mortar for expansion joints of highways and bridges according to any one of claims 1 to 8, characterized in that: The main materials for preparing the high-strength elastic mortar are fast-hardening sulphoaluminate, ordinary Portland cement, natural quartz sand, rubber particles and additives.

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