阅读说明：本技术 固废基泡沫混凝土性能及封存二氧化碳能力的测试方法 (Method for testing performance of solid waste base foam concrete and capability of sealing and storing carbon dioxide ) 是由 孙路路 段守雷 王刚 王海山 曹晓强 辛林 于 2021-09-30 设计创作，主要内容包括：本发明公开了一种固废基泡沫混凝土性能及封存二氧化碳能力的测试方法,第一步,准备固废基泡沫混凝土材料性能及封存二氧化碳能力试验台；第二步,向左右托盘中注入等量的泡沫混凝土材料进行封存；第三步,向左箱体内通入二氧化碳,分析泡沫混凝土材料对二氧化碳的封存量,以及封存过程中的温度演化规律；第四步,重复第二步和第三步,分析初始流动度、温度以及注入压力对泡沫混凝土材料封存能力的影响；第五步,测试固废基泡沫混凝土材料固化后的抗压强度,以及混凝土材料破碎后是否有二氧化碳溢出。用于研究固废基泡沫混凝土在封存二氧化碳过程中的强度变化,以及不同初始流动度、温度和二氧化碳压力,对固废基泡沫混凝土封存或固化的影响。(The invention discloses a method for testing the performance and the carbon dioxide sealing capacity of solid waste base foam concrete, which comprises the following steps of firstly, preparing a test bed for testing the performance and the carbon dioxide sealing capacity of a solid waste base foam concrete material; secondly, injecting the same amount of foam concrete materials into the left tray and the right tray for sealing; thirdly, introducing carbon dioxide into the left box body, and analyzing the sealing amount of the foam concrete material to the carbon dioxide and the temperature evolution rule in the sealing and storing process; fourthly, repeating the second step and the third step, and analyzing the influence of the initial fluidity, the temperature and the injection pressure on the sealing capacity of the foam concrete material; and fifthly, testing the compressive strength of the solid waste base foam concrete material after curing and whether carbon dioxide overflows after the concrete material is crushed. The method is used for researching the strength change of the solid waste base foam concrete in the process of sealing carbon dioxide, and the influence of different initial fluidity, temperature and carbon dioxide pressure on the sealing or curing of the solid waste base foam concrete.)

1. A method for testing the performance and the carbon dioxide sequestration capacity of solid waste foam concrete is characterized by comprising the following steps:

firstly, preparing a test bed for the performance of a solid waste base foam concrete material and the capability of sealing and storing carbon dioxide;

the test bed for testing the performance of the solid waste base foam concrete material and the capability of sealing carbon dioxide comprises a sealed transparent box (1) and a carbon dioxide steel cylinder (2), a partition board (1a) is arranged in the sealed transparent box (1) to divide the space in the box into a left box body and a right box body, an electronic balance (3) is fixedly arranged at the bottom of the sealed transparent box (1), a left tray (3a) and a right tray (3a) of the electronic balance (3) respectively extend into the left box body and the right box body which respectively correspond to each other, scale marks are drawn at the bottom of the trays (3a), a telescopic compressive strength tester (4) is arranged above each tray (3a), a telescopic supporting frame (11) is arranged below each tray, the left box body and the right box body are respectively provided with a temperature sensor (5) and a carbon dioxide concentration monitor (6) No. 1, heating rods (9) are respectively arranged at the bottoms of the left box body and the right box body, solid waste base foam concrete material feeding ports (7) are respectively arranged on the left box body and the right box body, the carbon dioxide steel cylinder (2) is connected with the left box body through a pipeline (10), and a No. 2 carbon dioxide concentration monitor (12) and a valve (8) are arranged on the pipeline (10);

secondly, injecting the same amount of foam concrete materials into left and right trays (3a) through solid waste base foam concrete material inlets (7) on left and right boxes by using the same pressure injection equipment to seal the foam concrete materials prepared from the solid waste bases, wherein scales are drawn at the bottom of each tray (3a), and the initial fluidity of the sealed materials is judged by observing the diffusion distance of the sealed materials on the trays (3 a);

thirdly, leveling the electronic balance (3), opening a valve (8) on a pipeline (10), introducing a certain amount of carbon dioxide into the left box body, observing data change of the electronic balance (3), temperature change monitored by temperature sensors (5) of the left box body and the right box body and concentration change parameters monitored by a carbon dioxide concentration monitor (6) No. 1, and analyzing the sealing amount of the foam concrete material to the carbon dioxide and the temperature evolution rule in the sealing process;

fourthly, repeating the second step and the third step, raising the temperature of the left box body and the right box body to the same temperature through a heating rod (9), changing the injection pressure of carbon dioxide through a valve (8) on an adjusting pipeline (10), observing the readings of the electronic balance (3), the temperature sensor (5) and the No. 1 carbon dioxide concentration monitor (6) again, and analyzing the influence of the initial fluidity, the temperature and the injection pressure on the sealing capacity of the foam concrete material;

fifthly, after each sealing experiment is finished, the supporting frame (11) is lifted to support the tray (3a), the anti-compression experiment tester (4) is lowered to be in contact with the solid waste base foam concrete material in the tray (3a), the solidified solid waste base foam concrete material is gradually pressurized, the anti-compression strength of the solidified solid waste base foam concrete material is tested, whether carbon dioxide overflows after the concrete material is crushed or not is judged, whether the carbon dioxide is solidified by chemical reaction or physically sealed in the material is judged, and meanwhile, the influence of the carbon dioxide on the strength increment of the solid waste base foam concrete material is analyzed.

2. The method for testing the performance and the carbon dioxide sequestration capacity of the solid waste foam concrete according to claim 1, which is characterized in that: the support frame (10) is provided with a compressive strength tester (4).

3. The method for testing the performance and the carbon dioxide sequestration capacity of the solid waste foam concrete according to claim 1, which is characterized in that: the solid waste base foam concrete material feeding port (7) and the interface connected with the pipeline (10) are arranged on the side walls of the left box body and the right box body, and the temperature sensor (5) and the No. 1 carbon dioxide concentration monitor (6) are arranged on the tops of the left box body and the right box body.

4. The method for testing the performance and the carbon dioxide sequestration capacity of the solid waste foam concrete according to claim 1, which is characterized in that: the heating rods (9) are uniformly paved at the bottoms of the left box body and the right box body.

5. The method for testing the performance and the carbon dioxide sequestration capacity of the solid waste foam concrete according to claim 1, which is characterized in that: the circumference of the tray (3a) is provided with a surrounding edge, and the size of a pressure head of the compressive strength tester (4) is matched with the size of the inner space of the circumferential surrounding edge of the tray (3 a).

6. The method for testing the performance and the carbon dioxide sequestration capacity of the solid waste foam concrete according to claim 1, which is characterized in that: the closed transparent box (1) and the partition plate (1a) are both made of acrylic plates, and the tray (3a) is a metal tray.

Technical Field

The invention relates to the technical field of solid waste base foam concrete performance test methods, and is used for testing the performance of solid waste base foam concrete materials and the capability of sealing carbon dioxide.

Background

The solid waste base foam concrete mainly comprises solid waste base materials such as fly ash, carbide slag and the like. In the technical field of coal mining, the solid waste base foam concrete is used for sealing and curing carbon dioxide, so that the safety of coal mining can be ensured. However, the temperature difference of different buried depth coal rock layers is large, and the supporting effect of the top plate is different due to different sealed and solidified stresses. At present, no scientific research system and test method exists for the material performance of solid waste base foam concrete, and how to fully utilize underground waste space to carry out carbon dioxide sealing and curing and effectively manage the natural ignition danger of a goaf due to the influence of different temperatures and carbon dioxide injection pressures on the sealing and storing capacity of the foam concrete material.

Disclosure of Invention

The invention aims to provide a method for testing the performance of a solid waste base foam concrete material and the capability of sealing carbon dioxide, which is used for researching the strength change of the solid waste base foam concrete in the process of sealing carbon dioxide, and the influence of different initial fluidity, temperature and carbon dioxide pressure on the sealing or curing of the solid waste base foam concrete.

Therefore, the technical scheme adopted by the invention is as follows: a method for testing the performance and the carbon dioxide sequestration capacity of solid waste foam concrete comprises the following steps:

firstly, preparing a test bed for the performance of a solid waste base foam concrete material and the capability of sealing and storing carbon dioxide;

the test bed for the performance and the capability of sealing and storing carbon dioxide of the solid waste base foam concrete material comprises a sealed transparent box and a carbon dioxide steel cylinder, a partition board is arranged in the sealed transparent box to divide the space in the box into a left box body and a right box body, an electronic balance is fixedly arranged at the bottom of the closed transparent box, a left tray and a right tray of the electronic balance respectively extend into the corresponding left box body and the corresponding right box body, scale marks are drawn at the bottoms of the trays, a telescopic compressive strength tester is arranged above each tray, a telescopic supporting frame is arranged below each tray, the left box body and the right box body are respectively provided with a temperature sensor and a carbon dioxide concentration monitor No. 1, heating rods are respectively arranged at the bottoms of the left box body and the right box body, solid waste base foam concrete material feeding ports are respectively arranged on the left box body and the right box body, carbon dioxide steel cylinders are connected with the left box body through pipelines, and the carbon dioxide concentration monitors No. 2 and valves are arranged on the pipelines;

secondly, injecting the same amount of foam concrete materials into left and right trays through solid waste base foam concrete material feed inlets on left and right box bodies for sealing and storing by the same pressure injection equipment, wherein scales are drawn at the bottom of each tray, and the initial fluidity of the sealing and storing material is judged by observing the diffusion distance of the sealing and storing material on the trays;

leveling an electronic balance, opening a valve on a pipeline, introducing a certain amount of carbon dioxide into the left box body, observing data change of the electronic balance, temperature change monitored by temperature sensors of the left box body and the right box body and concentration change parameters monitored by a carbon dioxide concentration monitor No. 1, and analyzing the sealing amount of the foam concrete material to the carbon dioxide and the temperature evolution rule in the sealing process;

fourthly, repeating the second step and the third step, raising the temperature of the left box body and the right box body to the same temperature through the heating rod, changing the injection pressure of the carbon dioxide through adjusting a valve on a pipeline, observing the readings of the electronic balance, the temperature sensor and the No. 1 carbon dioxide concentration monitor again, and analyzing the influence of the initial fluidity, the temperature and the injection pressure on the sealing capacity of the foam concrete material;

and fifthly, after the sealing experiment is performed each time, lifting the supporting frame to support the tray, lowering the compression resistance experiment tester to be in contact with the solid waste base foam concrete material in the tray, gradually pressurizing the solidified solid waste base foam concrete material, testing the compression resistance strength of the solidified solid waste base foam concrete material, and judging whether carbon dioxide overflows after the concrete material is crushed, so as to judge whether the carbon dioxide is subjected to chemical reaction solidification or is physically sealed in the material, and simultaneously analyzing the influence of the carbon dioxide on the strength increment of the solid waste base foam concrete material.

Preferably, the support frame is provided with a compressive strength tester.

Preferably, the solid waste base foam concrete material inlet and the interface connected with the pipeline are both arranged on the side walls of the left box body and the right box body.

More preferably, the heating rods are uniformly laid at the bottoms of the left box body and the right box body, and the temperature sensors and the No. 1 carbon dioxide concentration monitors are arranged at the tops of the left box body and the right box body.

Further preferably, the circumference of the tray is provided with a surrounding edge, and the size of the pressure head of the compressive strength tester is matched with the size of the inner space of the circumferential surrounding edge of the tray.

Preferably, the closed transparent box and the partition plate are both made of acrylic plates, and the tray is a metal tray.

The invention has the beneficial effects that: the visual transparent box body with the partition plate is adopted, and combined with the combined action of an electronic balance with scales, a compressive strength tester, a temperature sensor, a carbon dioxide concentration monitor, a heating rod, a supporting frame and the like, the visual transparent box body is used for testing the performance of the solid waste base foam concrete material and the capability of sealing and storing carbon dioxide; the method is used for researching the strength change of the solid waste base foam concrete in the process of sealing carbon dioxide, different initial fluidity, temperature and carbon dioxide pressure, and the influence on the sealing or curing of the solid waste base foam concrete, so as to find out the optimal parameter of the carbon dioxide which is completely cured in the solid waste base foam concrete material; the method has the advantages that the method is more intuitive, reliable, convenient, strong in contrast and strong in operability, and has important guiding significance for guiding safe and scientific exploitation of coal seams by researching the curing action process of the solid waste base foam concrete on carbon dioxide, the influence of the temperature difference of different buried coal rock layers on the curing stress of the solid waste base foam concrete and the supporting effect of the cured coal rock layers on the top plate, fully utilizing the underground waste space and effectively controlling the natural ignition danger of the goaf.

Drawings

FIG. 1 is a schematic structural diagram of a test bed for testing the performance of solid waste base foam concrete materials and the capability of sealing carbon dioxide.

Detailed Description

The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:

a method for testing the performance and the carbon dioxide sequestration capacity of solid waste foam concrete comprises the following steps:

firstly, preparing a test bed for the performance of the solid waste base foam concrete material and the capability of sealing and storing carbon dioxide.

As shown in figure 1, the test bed for the performance and the capability of sealing carbon dioxide of the solid waste based foam concrete material mainly comprises a closed transparent box 1, a carbon dioxide steel cylinder 2, an electronic balance 3, a compressive strength tester 4, a temperature sensor 5, a carbon dioxide concentration monitor No. 1 6, a valve 8, a heating rod 9, a pipeline 10, a support frame 11 and a carbon dioxide concentration monitor No. 2 12.

A partition board 1a is arranged in the closed transparent box 1 to divide the space in the box into a left box body and a right box body, and the closed transparent box 1 and the partition board 1a are preferably made of acrylic plates.

An electronic balance 3 is fixedly arranged at the bottom of the closed transparent box 1, a left tray 3a and a right tray 3a of the electronic balance 3 respectively extend into the left box body and the right box body which respectively correspond to the left box body and the right box body, scale marks are drawn at the bottom of the trays 3a, and the trays 3a are preferably metal trays.

Each tray 3a is provided with a telescopic compressive strength tester 4 at the upper part and a telescopic supporting frame 11 at the lower part, and the supporting frame 10 can be the compressive strength tester 4, namely each tray 3a is provided with a telescopic compressive strength tester at the upper part and the lower part.

The left and right boxes are each provided with a temperature sensor 5 and a carbon dioxide concentration monitor No. 1 6. The bottom of the left box body and the bottom of the right box body are respectively provided with a heating rod 9 for heating the left box body and the right box body. The heating rods 9 are preferably uniformly laid on the bottoms of the left and right cases.

The left box body and the right box body are both provided with solid waste base foam concrete material inlets 7 for injecting solid waste base foam concrete materials into the trays 3a in the left box body and the right box body. The carbon dioxide steel cylinder 2 is connected with the left box body through a pipeline 10, and a No. 2 carbon dioxide concentration monitor 12 and a valve 8 are arranged on the pipeline 10. The carbon dioxide steel cylinder 2 is not connected with the right box body, one of the left box body and the right box body is filled with carbon dioxide, the other is not filled with carbon dioxide, and the left box body and the right box body are compared to accurately test the difference of the filled or not filled with carbon dioxide.

Preferably, a solid waste based foam concrete material inlet 7 and a connector connected with a pipeline 10 are arranged on the side walls of the left box body and the right box body, and the temperature sensor 5 and the No. 1 carbon dioxide concentration monitor 6 are arranged on the top of the left box body and the right box body.

In addition, the circumferential direction of the tray 3a is preferably provided with a surrounding edge, the size of the pressure head of the compressive strength tester 4 is matched with the size of the inner space of the circumferential surrounding edge of the tray 3a, and when the pressure head of the compressive strength tester 4 enters, the surrounding edge just covers the pressure head.

And secondly, injecting the same amount of foam concrete materials into the left tray 3a and the right tray 3a through solid waste base foam concrete material feed inlets 7 on the left box body and the right box body by the same injection equipment for sealing, wherein scales are drawn at the bottom of each tray 3a, and the initial fluidity of the sealing materials is judged by observing the diffusion distance of the sealing materials on the trays 3 a.

Thirdly, leveling the electronic balance 3, opening a valve 8 on the pipeline 10, and introducing a certain amount of carbon dioxide into the left box body; and observing data change of the electronic balance 3, temperature change monitored by the temperature sensors 5 of the left box body and the right box body and concentration change parameters monitored by the No. 1 carbon dioxide concentration monitor 6, so as to analyze the sealing amount of the foam concrete material to the carbon dioxide and the temperature evolution rule in the sealing process.

And fourthly, repeating the second step and the third step, raising the temperature of the left box body and the right box body to the same temperature through the heating rod 9, changing the injection pressure of the carbon dioxide through the valve 8 on the adjusting pipeline 10, observing the readings of the electronic balance 3, the temperature sensor 5 and the No. 1 carbon dioxide concentration monitor 6 again, and analyzing the influence of the initial fluidity, the temperature and the injection pressure on the sealing capacity of the foam concrete material.

And fifthly, after the sealing experiment is performed each time, lifting the supporting frame 11 to support the tray 3a, lowering the compression resistance experiment tester 4 to be in contact with the solid waste base foam concrete material in the tray 3a, gradually pressurizing the solidified solid waste base foam concrete material, testing the compression resistance strength of the solidified solid waste base foam concrete material and whether carbon dioxide overflows after the concrete material is crushed, judging whether the carbon dioxide is subjected to chemical reaction solidification or is physically sealed in the material, and simultaneously analyzing the influence of the carbon dioxide on the strength increase of the solid waste base foam concrete material.

In the pressurizing link of the experimental process, if carbon dioxide overflows from the crushed concrete material, the carbon dioxide is not completely cured in the solid waste-based foam concrete material and is temporarily stored, when the next experiment is repeated, the storage time can be prolonged or other parameters can be changed, the second step and the third step are repeated, and the second step and the third step are subjected to a plurality of storage tests until the optimal parameters of the carbon dioxide completely cured in the solid waste-based foam concrete material are found out.