In-situ maintenance system and method of modified undisturbed soil building block material for ecological environment restoration

Abstract

The invention discloses an in-situ maintenance system of a modified undisturbed soil building block material for ecological environment restoration. The in-situ maintenance system comprises a solar energy collecting device and a maintenance device arranged above the solar energy collecting device. The curing device comprises a glass box body, a water containing groove formed in the bottom of the glass box body and a curing frame arranged above the water containing groove. And the glass box body is connected with the solar energy collecting device through an inclined strut. The invention further discloses an in-situ curing method of the modified undisturbed soil building block material for ecological environment restoration. By adopting a double curing mode of steam curing and sunlight gathering, on-site high-efficiency curing of the undisturbed soil building block material is realized, and the method has the characteristics of greenness and low carbon.

Description

Technical Field

[0001] The present invention relates to the technical field of ecological restoration, and in particular to an in-situ maintenance system and method of a modified original soil block material for ecological environmental restoration. Background Art

[0002] The Yellow River Basin has always been the focus of ecological construction for environmental protection. The soil erosion in the middle reaches of the Yellow River is more serious, which has long led to the accumulation of silt in the middle and lower reaches of the Yellow River. The most effective way to control it is to protect the channel along the flow channel. Cement blocks are usually used for channel protection, but cement blocks are expensive and have a great impact on the environment. In addition, cement block materials need to be cured before being transported to the repair site. For areas such as Inner Mongolia, due to the limitations of transportation conditions, they usually face problems such as insufficient material supply and high breakage rate.

[0003] Therefore, the present invention adopts the method of directly using the original soil at the restoration site to make the building block material for ecological restoration, which can reduce the restoration cost.

[0004] In addition, curing of block materials during the preparation process is a necessary step to improve their performance. Natural curing or steam curing is usually used for curing the finished block materials. Natural curing uses artificial heat preservation and humidification of block materials, which is labor-intensive, has a long curing cycle, and has poor performance; steam curing requires corresponding supporting equipment (boilers, etc.), which consumes a lot of energy, lacks local infrastructure, has high construction costs and high energy consumption, and is prone to environmental pollution and safety problems. Therefore, how to solve the cost and transportation problems of block materials, as well as the problems in the above-mentioned curing process, is crucial to ecological restoration projects. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide an on-site maintenance system and method for modified original soil block materials for ecological environment restoration in order to address the deficiencies in the prior art, which not only solves the problem of high cost of transporting block materials to other places, but also solves the problems of high cost, high energy consumption and environmental pollution of block material maintenance equipment, and realizes the on-site use of solar energy to maintain and modify original soil block materials.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An in-situ curing system for modified original soil block materials for ecological environment restoration comprises a solar energy collecting device and a curing device arranged above the solar energy collecting device; the curing device comprises a glass box, a water tank arranged at the bottom of the glass box, and a curing frame arranged above the water tank.

[0008] A solar energy collecting device is used to convert solar energy into thermal energy to heat the curing device. The water in the water tank is heated and vaporized to form water vapor. The water vapor cures the original soil block materials in the curing box, accelerates the hydration reaction and hardening process of the internal minerals, and improves the early strength and durability. The use of water vapor to cure the original soil block materials can both heat and humidify, and there is no need to spray water separately. The structure is simpler, the cost is reduced, and the performance of the original soil block materials is better improved.

[0009] Preferably, the solar energy collecting device is a concave mirror, the concave mirror is designed as a rotating parabola, and the concave mirror is connected to the glass box through a diagonal brace.

[0010] Utilizing the reflection principle of the reflector, the incident light passes through the reflector and concentrates the reflected light onto the glass box, increasing the solar energy density per unit area of ​​the collector, causing its temperature to rise sharply, heating the medium in the collector (such as water), converting solar energy into thermal energy, and at the same time improving the utilization rate of solar energy.

[0011] The concave mirrors are divided into blocks for easy transportation. At the same time, the light receiving area can be controlled and adjusted by disassembling or adding concave mirrors, thereby adjusting the light flux. By adjusting the light flux, the hydration speed and hydration product type of the original soil block material can be changed, thereby obtaining original soil block materials with different strengths.

[0012] Preferably, exhaust valves are provided on both sides of the curing device to adjust the temperature and humidity in the curing device.

[0013] Preferably, a cover plate is provided on the water tank, a steam delivery pipe is provided on the cover plate, and a steam pump is provided on the steam delivery pipe; the cover plate is tilted, and a return port is provided at the lower side of the cover plate. The cover plate separates the water tank from the curing area, and the steam pump is used to adjust the amount of water vapor entering the curing area, thereby controlling the temperature and humidity therein; the water vapor is cooled to become condensed water and gathers in the concave part of the cover plate, and flows back to the water tank through the return port, forming a water cycle. This saves water resources and alleviates the shortage of water resources.

[0014] Preferably, the glass box is cylindrical; a temperature sensor and a humidity sensor are also provided in the glass box. The cylindrical shape can maximize the area of ​​light received and facilitate the gathering of condensed water; and it is convenient to monitor the temperature and humidity in the curing box at any time.

[0015] Preferably, a heat absorbing coating is provided on the glass box.

[0016] An in-situ maintenance method for modified original soil block materials for ecological environment restoration comprises the following steps:

[0017] (1) Using the in-situ curing system for modified undisturbed soil block materials for ecological environment restoration as claimed in claim 1, the undisturbed soil block materials are placed on a curing rack in a glass box;

[0018] (2) Sunlight shines on the concave mirror, and the incident light is concentrated at the bottom of the glass box after reflection, heating the medium water in the water tank to form water vapor, and the water vapor cures the original soil block materials on the curing frame;

[0019] (3) Directly irradiate the glass box with reflected light and sunlight at the same time, and assist in heating the original soil block materials on the curing frame;

[0020] (4) After curing for 4-12 hours, remove the original soil block materials and set aside.

[0021] Preferably, the temperature inside the glass box is 60-90°C.

[0022] Preferably, the humidity in the glass box is 70-92%.

[0023] The high temperature and high humidity steam environment is used to promote the reaction process of the original soil block material, improve its performance and meet the engineering requirements.

[0024] Preferably, the solar radiation intensity concentrated by the concave mirror is 1817.425 to 1950.372 KJ / ㎡ per hour.

[0025] The preparation of the original soil block material in this patent is as follows: solid wastes such as slag are added to the original soil of the ecological environment restoration site, and a modifier is added to mix them evenly, and the mixture is put into a mold and pressed into blocks. The mixing and pressing processes are conventional operations. Among them, the amount of slag added is 10%, and the amount of modifier added is 12%.

[0026] The beneficial effects of the present invention are:

[0027] The present invention adopts original soil to directly make block materials, and local materials are used to replace cement block materials, thereby reducing the repair cost and solving the problem of transportation to other places.

[0028] The present invention places the original soil block material directly exposed in the curing box, which can directly contact with high-temperature steam, and play the role of humidification and heating at the same time; in addition, reflected light and sunlight can also be directly irradiated on the curing box, which is further heated, so as to realize the dual curing of steam curing and concentrated sunlight curing of the original soil block material at the same time, improve the activity of the original soil block material, accelerate the hydration speed and reaction efficiency of the minerals inside the block material, and generate a gel material with the cementing properties of hydrated calcium silicate (CSH) or hydrated calcium aluminosilicate (CASH). The gel material has cementing properties, can improve the pore structure inside the original soil block material, strengthen the cementation between particles, and improve its strength. Therefore, the present invention realizes the high-efficiency on-site curing of the original soil block material by adopting the dual curing methods of steam curing and concentrated sunlight, and has the characteristics of green and low carbon. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention;

[0030] Figure 2 It is a partial structural schematic diagram of a curing box according to an embodiment of the present invention;

[0031] Figure 3 It is a partial schematic diagram of a curing box according to another embodiment of the present invention;

[0032] Figure 4 This is a compressive strength test diagram of the present invention at different temperatures.

[0033] In the figure: 1 concave mirror, 2 glass box, 3 diagonal support, 4 exhaust valve, 5 temperature sensor, 6 humidity sensor, 7 curing frame, 8 building block material, 9 water tank, 10 steam pump, 11 cover plate, 12 reflux port.

[0034] T1 is room temperature curing, T2 is 40℃, T3 is 60℃, and T4 is 80℃. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] Example 1

[0037] An in-situ maintenance system for modified original soil block materials for ecological environment restoration, such as Figure 1 As shown, it includes a solar energy collection device and a maintenance device arranged above the solar energy collection device. The solar energy collection device is a concave mirror 1, which is designed as a rotating parabola; the concave mirror 1 is connected to the maintenance device through a diagonal support 3, and exhaust valves 4 are respectively arranged on both sides of the maintenance device.

[0038] like Figure 2As shown, the curing device includes a horizontally arranged cylindrical glass box 2, a water tank 9 arranged at the bottom of the glass box 2, and a curing frame 7 arranged above the water tank 9, and the curing frame 7 is used to place the original soil block material 8 to be cured. A heat absorbing coating is provided on the glass box 2, and the heat absorbing coating is a conventional coating.

[0039] A temperature sensor 5 and a humidity sensor 6 are also provided in the glass box 2 .

[0040] Example 2

[0041] An in-situ curing system for modified original soil block materials for ecological environment restoration includes a solar energy collection device and a curing device arranged above the solar energy collection device. The solar energy collection device is a concave mirror, which is designed as a rotating parabola; the concave mirror 1 is connected to the curing device.

[0042] like Figure 3 As shown, the curing device includes a glass box 2, a water tank 9 arranged at the bottom of the glass box 2, and a curing frame 7 arranged above the water tank 9, and the curing frame 7 is used to place the original soil block material 8 to be cured.

[0043] A cover plate 11 is provided on the water tank 9, a steam delivery pipe is provided on the cover plate 11, and a steam pump 10 is provided on the steam delivery pipe; the cover plate 11 is tilted, and a return port 12 is provided at the lower side of the cover plate 11. The cover plate 11 separates the water tank 9 from the curing area, and the steam pump 10 is used to adjust the amount of water vapor entering the curing area, thereby controlling the temperature and humidity therein; the water vapor is cooled to become condensed water and gathers in the concave part of the cover plate 11, and flows back to the water tank 9 through the return port 12, forming a water cycle.

[0044] A heat absorbing coating is provided on the glass box 2, and the heat absorbing coating is a conventional coating. The glass box 2 can also be in other shapes, such as a rectangle, etc. The water tank can be connected to an external water pipe.

[0045] A temperature sensor 5 and a humidity sensor 6 are also provided in the glass box 2 .

[0046] A controller may also be provided in the above system to control the opening and closing of the exhaust valve 4 and the steam pump 10. The structure, connection method and working principle of the controller are conventional methods and belong to the prior art.

[0047] The selection of original soil block materials 8 is divided into the following five categories:

[0048] AT group: calculated by mass fraction, original soil 75%, modifier (M s =2.0) 12%, blast furnace slag 10%, water 3%.

[0049] BT group: calculated by mass fraction, original soil 75%, modifier (M s =2.5) 12%, fly ash 10%, water 3%.

[0050] CT group: calculated by mass fraction, original soil 75%, modifier (M s =2.0) 12%, red mud 10%, water 3%.

[0051] DT group: calculated by mass fraction, original soil 75%, modifier (M s =2.5) 12%, steel slag 10%, water 3%.

[0052] ET group: calculated by mass fraction, original soil 75%, modifier (M s =2.0)12%, coal gangue 10%, water 3%.

[0053] The five kinds of raw materials are mixed and pressed into blocks respectively for standby use. All of these are conventional operations. The original soil is preferably soil from the Loess Plateau.

[0054] Example 3

[0055] An in-situ maintenance method for modified original soil block materials for ecological environment restoration comprises the following steps:

[0056] (1) Using the in-situ curing system of the modified undisturbed soil block material for ecological environment restoration in Example 1, the above five kinds of undisturbed soil block materials 8 are respectively placed on the curing frame 7 for curing; the light flux of the reflected light can be adjusted by adjusting the area of ​​the concave mirror 1, so that the solar radiation intensity concentrated by the concave mirror is 1817.425-1950.372 KJ / ㎡ per hour, which can rapidly heat up the water in the water tank.

[0057] (2) Sunlight shines on the concave mirror 1. The incident light is reflected and concentrated at the bottom of the glass box 2, heating the water in the water tank 9 to form water vapor. The water vapor rises to the curing area (curing rack 7) to cure the original soil block material 8 on the curing rack 7. At this time, the water vapor provides a high-temperature and high-humidity environment for the original soil block material 8, which can not only achieve a high-temperature curing environment, but also provide the humidity space required for the block material 8 to generate early strength.

[0058] (3) The reflected light and the sunlight gathered simultaneously directly irradiate the glass box 2, and assist in heating the original soil block material 8 on the curing frame 7, thereby utilizing solar energy more efficiently.

[0059] (4) After curing for 4-12 hours, the original soil block material 8 is taken out and set aside.

[0060] Example 4

[0061] An in-situ maintenance method for modified original soil block materials for ecological environment restoration comprises the following steps:

[0062] (1) Using the in-situ curing system of the modified original soil block material for ecological environment restoration in Example 2, the above five original soil block materials 8 are placed on the curing frame 7 for curing;

[0063] (2) Sunlight shines on the concave mirror 1, and the incident light is concentrated at the bottom of the glass box 2 after reflection, heating the water in the water tank 9 to form water vapor. The water vapor enters the curing area (curing rack 7) through the steam pump 10 to cure the original soil block material 8 on the curing rack 7. At the same time, the temperature and humidity in the glass box 2 are monitored in real time through the temperature sensor 5 and the humidity sensor 6, and the amount of water vapor entering is controlled by the steam pump 10, thereby adjusting the temperature and humidity in the glass box 2 to meet different curing needs; the condensed water generated during the curing process is gathered at the water outlet at the concave part of the cover plate 11 and then flows back to the water tank 9;

[0064] (3) The reflected light and sunlight gathered simultaneously directly irradiate the glass box 2, and assist in heating the original soil block material 8 on the curing frame 7, which can further shorten the curing time.

[0065] (4) After curing for 4-12 hours, the original soil block material 8 is taken out and set aside.

[0066] Example 5

[0067] A method for in-situ curing of modified undisturbed soil block materials for ecological environment restoration comprises randomly taking out 5 blocks from five groups of block materials, namely, AT, BT, CT, DT, and ET, and placing them together on a curing rack 7 of the structure of Example 2. The temperature in a glass box 2 is adjusted to 40° C. and the humidity to 90%. The materials are cured for 10 hours to obtain modified undisturbed soil block materials.

[0068] Example 6

[0069] A method for in-situ curing of modified undisturbed soil block materials for ecological environment restoration comprises randomly taking out 5 blocks from five groups of block materials, namely, AT, BT, CT, DT, and ET, and placing them together on a curing rack 7 of the structure of Example 2, and adjusting the temperature in a glass box 2 to 60° C. and the humidity to 90% for curing for 12 hours to obtain undisturbed soil block modified materials.

[0070] Example 7

[0071] An in-situ curing method for modified undisturbed soil block materials for ecological environment restoration comprises the following steps: randomly taking out 5 blocks from five groups of block materials, namely, AT, BT, CT, DT, and ET, and placing them together on a curing rack 7 of the structure of Example 2, and adjusting the temperature in a glass box 2 to 80° C. and the humidity to 90% for curing for 12 hours to obtain undisturbed soil block modified materials.

[0072] Comparative Example 1

[0073] The invention discloses an in-situ curing method of modified original soil block materials for ecological environment restoration. Five blocks are randomly taken out from five groups of block materials, namely AT, BT, CT, DT and ET, and are placed together at room temperature for curing for 12 hours to obtain original soil block modified materials.

[0074] The original soil block modified materials obtained in Examples 5-7 and Comparative Example 1 were subjected to strength tests respectively, and the test conditions were the same. The test results obtained are as follows: Figure 4 shown.

[0075] It can be seen from the figure that when the curing temperature is 80°C, the five samples all reach the maximum compressive strength, which are 15.17MPa, 11.22MPa, 9.10MPa, 6.17MPa and 8.99MPa respectively. Compared with the compressive strength of the samples in Comparative Example 1, the improvement is 16.60%, 56.50%, 256.3%, 104.10% and 169.00%.

[0076] At 80 °C, the Ca / Si ratio in the AT group was 1.44, and the main type of gel formed was CSH gel;

[0077] AT1: Ca / Si is 1.28 and 1.56; Al / Si is 0.15 and 0.38, the main type is CSH gel

[0078] The Ca / Si ratio in the BT group was 0.39 and 0.53, and the main type was CSH gel.

[0079] The Al / Si ratio in the CT, DT and ET groups was 0.32-0.70, and the main type of gel formed was Si-Al gel.

[0080] It can be seen that the temperature has a significant effect on the strength of the material, especially when the temperature reaches above 60°C, the strength is significantly improved. The activity of the block material is improved under high temperature, which accelerates the hydration reaction process and generates hydrated calcium silicate gel (CSH) or hydrated calcium silicate aluminate gel (CASH). This gel material has cementing properties, improves the pore structure, and enhances the cementation between particles.

[0081] The concave mirror focuses the incident sunlight onto a line by rotating the parabola. According to the optical principle, light parallel to the axis of the parabola will converge to the focal point, which is located on the axis of the mirror. The curing box is installed on the focal line of the concave mirror. When the sunlight is parallel to the axis of the mirror, all the reflected light radiation will converge on the curing box, heating it quickly.

[0082] The present invention utilizes the focusing characteristics of the solar concave mirror, and efficiently collects and concentrates solar energy through the reflection principle, thereby increasing the solar energy density in the area and realizing a dual heating method of steam and concentrated solar light heating for the curing box. This concentrated solar energy can quickly increase the local temperature, providing an efficient and environmentally friendly heat source for water heating. As the water temperature rises, water molecules obtain enough energy to be converted into steam. This process not only increases the thermal energy of the water, but also provides the necessary conditions for subsequent steam curing. By utilizing the high temperature and high humidity characteristics of water vapor, the block material is heated and moisturized, which can accelerate the hardening process of the material, improve its early strength, and thus enhance the durability of the material. By directly covering the surface of the material with water vapor, the heat and humidity of the steam can penetrate into the material, promote chemical reactions and physical changes inside the material, and achieve rapid curing.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. An in-situ maintenance system for modified undisturbed soil block materials for ecological environment restoration, characterized in that: It comprises a solar energy collecting device and a curing device arranged above the solar energy collecting device; the curing device comprises a glass box, a water tank arranged at the bottom of the glass box, and a curing frame arranged above the water tank.

2. The in-situ maintenance system of modified original soil block materials for ecological environment restoration according to claim 1 is characterized in that: The solar energy collecting device is a concave mirror, which is designed as a rotating parabola. The concave mirror is connected to the glass box through a diagonal brace.

3. The in-situ maintenance system of modified original soil block materials for ecological environment restoration according to claim 1 is characterized in that: Exhaust valves are respectively arranged on both sides of the maintenance device.

4. The in-situ maintenance system of modified original soil block materials for ecological environment restoration according to claim 1 or 2, characterized in that: A cover plate is provided on the water tank, a steam delivery pipe is provided on the cover plate, and a steam pump is provided on the steam delivery pipe; the cover plate is tilted, and a reflux port is provided at the lower side of the cover plate.

5. The in-situ maintenance system of modified original soil block materials for ecological environment restoration according to claim 1 is characterized in that: The glass box is cylindrical; a temperature sensor and a humidity sensor are also arranged in the glass box.

6. The in-situ maintenance system of modified original soil block materials for ecological environment restoration according to claim 1 is characterized in that: A heat absorbing coating is provided on the glass box.

7. An in-situ maintenance method for modified undisturbed soil block materials for ecological environment restoration, characterized in that: The following steps are involved: (1) Using the in-situ curing system for modified undisturbed soil block materials for ecological environment restoration as claimed in claim 1, the undisturbed soil block materials are placed on a curing rack in a glass box; (2) Sunlight shines on the concave mirror, and the incident light is concentrated at the bottom of the glass box after reflection, heating the medium water in the water tank to form water vapor, and the water vapor cures the original soil block materials on the curing frame; (3) Directly irradiate the glass box with reflected light and sunlight at the same time, and assist in heating the original soil block materials on the curing frame; (4) After curing for 4-12 hours, remove the original soil block materials and set aside.

8. The in-situ curing method of modified undisturbed soil block material for ecological environment restoration according to claim 7, characterized in that: The temperature inside the glass box is 60-90°C.

9. The in-situ curing method of modified undisturbed soil block materials for ecological environment restoration according to claim 7, characterized in that: The humidity in the glass box is 70-92%.

10. The in-situ curing method of modified undisturbed soil block material for ecological environment restoration according to claim 7, characterized in that: The solar radiation intensity concentrated by the concave mirror is 1817.425 to 1950.372 KJ / ㎡ per hour.

Images