Photosensitive concrete and preparation method thereof

Abstract

This invention relates to the field of concrete preparation, specifically to a photosensitive concrete and its preparation method. The raw materials for the photosensitive concrete provided by this invention include the following components and their weight percentages: 50-70 parts cement; 10-15 parts fine aggregate; 5-8 parts coarse aggregate; 3-5 parts photosensitive material; 1-2 parts water-reducing agent; 1-3 parts expansion agent; 0.5-1 part dispersant; and 0.3-0.5 parts stabilizer. Adding photosensitive material to the raw materials enables the concrete to possess certain photosensitivity, achieving air purification and improved corrosion resistance. This invention also provides a preparation method for this photosensitive concrete, comprising three steps: S1 preparation of a photosensitive functional agent solution, S2 preparation of the photosensitive concrete, and S3 molding and curing. This method, by optimizing the incorporation method of the photosensitive material and the composition of the concrete, effectively solves the shortcomings of uneven incorporation of photosensitive material and high concrete porosity leading to easy water absorption, thereby improving the corrosion resistance and photocatalytic efficiency of the concrete. It can also be used to prepare new wall materials or lightweight building materials.

Description

Technical Field

[0001] This invention relates to the field of concrete preparation, and more specifically to a photosensitive concrete and its preparation method. Background Technology

[0002] Concrete, an indispensable basic material in the construction industry, is widely used globally due to its excellent durability, plasticity, and economy. However, traditional concrete materials are susceptible to environmental erosion over long-term use, such as the penetration of airborne pollutants and moisture erosion, leading to a decline in indoor air quality and even affecting the health of residents. Furthermore, with the acceleration of urbanization and increased building airtightness, harmful gases released from interior decoration materials (such as formaldehyde and benzene) are difficult to effectively expel, further exacerbating indoor air pollution problems.

[0003] Photocatalysis, as a cutting-edge technology, cleverly utilizes light energy to drive catalytic reactions without requiring additional chemical energy input, demonstrating unique advantages of high efficiency and environmental friendliness. This technology not only accelerates the rate of chemical reactions but also reduces the formation of harmful substances during the reaction process, making it environmentally friendly and sustainable. In recent years, with the increasing awareness of quality of life and environmental protection, photocatalysis has received widespread attention and application in various fields such as air purification, water treatment, and self-cleaning, achieving remarkable results. However, despite the enormous potential of photocatalysis, its traditional application form is powdered photocatalytic materials, which face many challenges in large-scale application in practical engineering. These powdered materials are not only difficult to distribute uniformly and are prone to loss, but they can also cause environmental pollution during construction and maintenance, limiting their application scope. Therefore, exploring novel carrier materials to achieve stable and efficient application of photocatalysis has become an important research direction.

[0004] Combining photocatalysis technology with concrete materials offers a new approach to solving the aforementioned problems. By scientifically and rationally incorporating photosensitive materials into concrete, photocatalytically active concrete can be prepared. Under light conditions, this new type of concrete can decompose harmful substances in the air, such as formaldehyde and benzene, effectively purifying indoor air and improving the building microenvironment. It can also be used to prepare new wall materials or lightweight building materials. Therefore, photosensitive concrete has a promising future. Summary of the Invention

[0005] To address the aforementioned technical problems, a photosensitive concrete and its preparation method are proposed. The photosensitive concrete prepared by this method has good compressive strength, frost resistance, corrosion resistance and low carbonation depth, and also has the ability to purify air and absorb organic matter such as toluene in the air.

[0006] This invention discloses a photosensitive concrete, which is composed of the following components in parts by weight:

[0007] 50-70 parts cement; 10-15 parts fine aggregate; 5-8 parts coarse aggregate; 3-5 parts photosensitive material; 1-2 parts water-reducing agent; 1-3 parts expanding agent; 0.5-1 part dispersant; 0.3-0.5 parts stabilizer;

[0008] The photosensitizing materials are sodium peroxide and polyacid-based inorganic photosensitizers.

[0009] Preferably, the weight ratio of the polyacid-based inorganic photosensitizer to sodium peroxide is 1:(3~5).

[0010] Preferably, the polyacid-based inorganic photosensitizer is a Keggin-type polyacid, a Dawson-type polyacid, or an Anderson-type polyacid.

[0011] This invention also discloses a method for preparing photosensitive concrete, comprising the following preparation steps:

[0012] Preparation of S1 photosensitizing agent solution: Sodium peroxide is added to the reactor, then deionized water is added and stirred. After the sodium peroxide is completely dissolved, polyacid-based inorganic photosensitizer is added and stirred evenly for 30-60 minutes. Then, a dispersant is added and stirring is continued for 10-15 minutes. After stirring is completed, a mixture is obtained. The mixture is transferred to an ultrasonic mixer, a stabilizer is added, and ultrasonic treatment is started. After ultrasonic treatment is completed, a photosensitizing agent solution is obtained.

[0013] Preparation of S2 photosensitive concrete: First, clean and dry the fine aggregate and coarse aggregate. Then, add the cement, fine aggregate and coarse aggregate to the mixing mixer in sequence. Mix at low speed until completely mixed. Then, slowly add the photosensitive functional agent solution prepared in S1 to the mixing mixer. After the addition is completed, increase the speed of the mixing mixer and mix evenly. Then add the water-reducing agent and expansion agent and continue to mix at the original speed to finally form photosensitive concrete paste.

[0014] S3 Molding and Curing: Pour the photosensitive concrete slurry obtained in step S2 into the mold, vibrate to compact it to prevent air bubbles, control the ambient temperature and humidity for initial curing, demold after the initial curing time is over, and then perform secondary curing. After secondary curing, the photosensitive concrete is obtained.

[0015] Preferably, in the S1 photosensitizing agent solution preparation step, the mass ratio of sodium peroxide to deionized water is 1:(15~25).

[0016] Preferably, in the S1 photosensitizing agent solution preparation step, the stirring speed of the reactor is 800~1200 rpm; the ultrasonic frequency of the ultrasonic mixer is 20~50 kHz; and the ultrasonic treatment time is 20~40 min.

[0017] Preferably, in the S2 photosensitive concrete preparation step, the mixing speed in the mixing mixer is 200~400 rpm; the mixing time is 5~10 min; after the photosensitive functional solution is added, the speed of the mixing mixer is increased to 600~1000 rpm.

[0018] Preferably, in the S3 molding and curing step, the ambient temperature during the initial curing is 40~50℃; the ambient humidity is 80~90%; and the initial curing time is 20~25h.

[0019] Preferably, in the S3 molding and curing step, the ambient temperature during the secondary curing is 20~30℃; the ambient humidity is 60~70%; and the secondary curing time is 25~30 days.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] This invention provides a photosensitive concrete, which is composed of cement, fine aggregate, coarse aggregate, photosensitive material, water-reducing agent, expanding agent, dispersant, and stabilizer. The addition of the photosensitive material endows the concrete with photosensitivity, enabling it to undergo a photocatalytic reaction under light conditions, decomposing harmful substances in the air, effectively purifying indoor air, and improving the building's microenvironment. Through photocatalysis, it can reduce the erosion of the concrete surface by environmental pollutants (such as acidic rainwater and chlorides), thereby improving the concrete's corrosion resistance and long-term durability. It can be used to prepare novel wall materials or lightweight building materials.

[0022] This invention also provides a method for preparing photosensitive concrete. In preparing the photosensitive functional agent solution, after adding the stabilizer, an ultrasonic mixer is used to evenly disperse the photosensitive material in the solution. After the base material is evenly mixed, the photosensitive functional agent solution, water-reducing agent, and expanding agent are added. By optimizing the incorporation method of the photosensitive material and the composition of the concrete, the shortcomings of uneven incorporation of the photosensitive material and high concrete porosity leading to easy water absorption are effectively solved, thus improving the corrosion resistance and photocatalytic efficiency of the concrete. Detailed Implementation

[0023] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0024] For experiments not specifically described in the examples, the procedures or conditions should be followed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0025] Example 1: A photosensitive concrete, composed of the following components in parts by weight:

[0026] The composition includes: 50 parts cement; 10 parts fine aggregate; 5 parts coarse aggregate; 3 parts photosensitive material; 1 part water-reducing agent; 1 part expanding agent; 0.5 parts dispersant; and 0.3 parts stabilizer. The photosensitive material consists of sodium peroxide and Keggin-type polyacid, with a weight ratio of sodium peroxide to Keggin-type polyacid of 3:1.

[0027] A method for preparing photosensitive concrete includes the following preparation steps:

[0028] Preparation of S1 photosensitizing agent solution: Sodium peroxide was added to the reactor, and then deionized water was added and stirred. The mass ratio of sodium peroxide to deionized water was 1:15. The stirring speed of the reactor was 800 rpm. After the sodium peroxide was completely dissolved, Keggin type polyacid was added and stirred evenly. After stirring for 30 min, a dispersant was added and stirring was continued for 10 min. After stirring was completed, a mixture was obtained. The mixture was transferred to an ultrasonic mixer. The ultrasonic frequency of the ultrasonic mixer was set to 20 kHz. After adding a stabilizer, ultrasonic treatment was started. The ultrasonic treatment time was 20 min. After ultrasonic treatment was completed, the photosensitizing agent solution was obtained.

[0029] Preparation of S2 photosensitive concrete: First, clean and dry the fine aggregate and coarse aggregate. Then, add the cement, fine aggregate and coarse aggregate to the mixing mixer in sequence. Set the speed of the mixer to 200 rpm and mix at low speed for 5 minutes until completely mixed. Then, slowly add the photosensitive functional agent solution prepared in S1 to the mixing mixer. After the addition is completed, increase the speed of the mixing mixer to 600 rpm. Mix the materials in the mixer evenly and then add the water-reducing agent and expansion agent. Continue to mix at the original speed for 2 hours to finally form photosensitive concrete paste.

[0030] S3 Molding and Curing: Pour the photosensitive concrete slurry obtained in step S2 into the mold, vibrate to compact it to prevent air bubbles, and control the ambient temperature at 40℃ and the ambient humidity at 80% for initial curing. The initial curing time is 20 hours. After the initial curing time is completed, demold the concrete and perform a second curing. Control the second curing temperature at 20℃ and the second curing humidity at 60% for 20 days. After the second curing, the photosensitive concrete is obtained.

[0031] Example 2: A photosensitive concrete, composed of the following components in parts by weight:

[0032] The composition includes 55 parts cement; 11 parts fine aggregate; 5.5 parts coarse aggregate; 3.5 parts photosensitive material; 1.2 parts water-reducing agent; 1.5 parts expanding agent; 0.6 parts dispersant; and 0.35 parts stabilizer. The photosensitive material consists of sodium peroxide and Keggin-type polyacid, with a weight ratio of sodium peroxide to Keggin-type polyacid of 3.5:1.

[0033] A method for preparing photosensitive concrete includes the following preparation steps:

[0034] Preparation of S1 photosensitizing agent solution: Sodium peroxide was added to the reactor, and then deionized water was added and stirred. The mass ratio of sodium peroxide to deionized water was 1:17. The stirring speed of the reactor was 850 rpm. After the sodium peroxide was completely dissolved, Keggin type polyacid was added and stirred evenly. After stirring for 40 min, a dispersant was added and stirring was continued for 11 min. After stirring was completed, a mixture was obtained. The mixture was transferred to an ultrasonic mixer. The ultrasonic frequency of the ultrasonic mixer was set to 25 kHz. After adding a stabilizer, ultrasonic treatment was started. The ultrasonic treatment time was 25 min. After ultrasonic treatment was completed, the photosensitizing agent solution was obtained.

[0035] Preparation of S2 photosensitive concrete: First, clean and dry the fine aggregate and coarse aggregate. Then, add the cement, fine aggregate and coarse aggregate to the mixing mixer in sequence. Set the speed of the mixer to 250 rpm and mix at low speed for 5 minutes until completely mixed. Then, slowly add the photosensitive functional agent solution prepared in S1 to the mixing mixer. After the addition is completed, increase the speed of the mixing mixer to 700 rpm and mix the materials in the mixer evenly. Then add the water-reducing agent and the expansion agent and continue to mix at the original speed for 2.2 hours to finally form photosensitive concrete paste.

[0036] S3 Molding and Curing: Pour the photosensitive concrete slurry obtained in step S2 into the mold, vibrate to compact it to prevent air bubbles, and control the ambient temperature at 42℃ and the ambient humidity at 80% for initial curing. The initial curing time is 21 hours. After the initial curing time is completed, demold the concrete and perform a second curing. Control the second curing temperature at 22℃ and the second curing humidity at 60% for 22 days. After the second curing, the photosensitive concrete is obtained.

[0037] Example 3: A photosensitive concrete, composed of the following components in parts by weight:

[0038] The composition includes 60 parts cement; 12 parts fine aggregate; 6 parts coarse aggregate; 4 parts photosensitive material; 1.4 parts water-reducing agent; 2 parts expanding agent; 0.7 parts dispersant; and 0.4 parts stabilizer. The photosensitive material consists of sodium peroxide and Keggin-type polyacid, with a weight ratio of sodium peroxide to Keggin-type polyacid of 4:1.

[0039] A method for preparing photosensitive concrete includes the following preparation steps:

[0040] Preparation of S1 photosensitizing agent solution: Sodium peroxide was added to the reactor, and then deionized water was added and stirred. The mass ratio of sodium peroxide to deionized water was 1:20. The stirring speed of the reactor was 900 rpm. After the sodium peroxide was completely dissolved, Keggin type polyacid was added and stirred evenly. After stirring for 50 min, a dispersant was added and stirring was continued for 12 min. After stirring was completed, a mixture was obtained. The mixture was transferred to an ultrasonic mixer. The ultrasonic frequency of the ultrasonic mixer was set to 30 kHz. After adding a stabilizer, ultrasonic treatment was started. The ultrasonic treatment time was 30 min. After ultrasonic treatment was completed, the photosensitizing agent solution was obtained.

[0041] Preparation of S2 photosensitive concrete: First, clean and dry the fine aggregate and coarse aggregate. Then, add the cement, fine aggregate and coarse aggregate to the mixing mixer in sequence. Set the speed of the mixer to 300 rpm and mix at low speed for 7 minutes until completely mixed. Then, slowly add the photosensitive functional agent solution prepared in S1 to the mixing mixer. After the addition is completed, increase the speed of the mixing mixer to 800 rpm and mix the materials in the mixer evenly. Then add the water-reducing agent and the expansion agent and continue to mix at the original speed for 2.5 hours to finally form the photosensitive concrete paste.

[0042] S3 Molding and Curing: Pour the photosensitive concrete slurry obtained in step S2 into the mold, vibrate to compact it to prevent air bubbles, and control the ambient temperature at 45℃ and the ambient humidity at 85% for initial curing. The initial curing time is 22 hours. After the initial curing time is completed, demold the concrete and perform a second curing. Control the second curing temperature at 25℃ and the second curing humidity at 65% for 25 days. After the second curing, the photosensitive concrete is obtained.

[0043] Example 4: A photosensitive concrete, composed of the following components in parts by weight:

[0044] The composition includes 65 parts cement; 14 parts fine aggregate; 7 parts coarse aggregate; 4.5 parts photosensitive material; 1.7 parts water-reducing agent; 2.5 parts expanding agent; 0.85 parts dispersant; and 0.45 parts stabilizer. The photosensitive material consists of sodium peroxide and Keggin-type polyacid, with a weight ratio of sodium peroxide to Keggin-type polyacid of 4.5:1.

[0045] A method for preparing photosensitive concrete includes the following preparation steps:

[0046] Preparation of S1 photosensitizing agent solution: Sodium peroxide was added to the reactor, and then deionized water was added and stirred. The mass ratio of sodium peroxide to deionized water was 1:23. The stirring speed of the reactor was 950 rpm. After the sodium peroxide was completely dissolved, Keggin type polyacid was added and stirred evenly. After stirring for 55 min, a dispersant was added and stirring was continued for 13 min. After stirring was completed, a mixture was obtained. The mixture was transferred to an ultrasonic mixer. The ultrasonic frequency of the ultrasonic mixer was set to 40 kHz. After adding a stabilizer, ultrasonic treatment was started. The ultrasonic treatment time was 35 min. After ultrasonic treatment was completed, the photosensitizing agent solution was obtained.

[0047] Preparation of S2 photosensitive concrete: First, clean and dry the fine aggregate and coarse aggregate. Then, add the cement, fine aggregate and coarse aggregate to the mixing mixer in sequence. Set the speed of the mixer to 350 rpm and mix at low speed for 8 minutes until completely mixed. Then, slowly add the photosensitive functional agent solution prepared in S1 to the mixing mixer. After the addition is completed, increase the speed of the mixing mixer to 900 rpm. Mix the materials in the mixer evenly and then add the water-reducing agent and the expansion agent. Continue to mix at the original speed for 2.5 hours to finally form photosensitive concrete paste.

[0048] S3 Molding and Curing: Pour the photosensitive concrete slurry obtained in step S2 into the mold, vibrate to compact it to prevent air bubbles, and control the ambient temperature at 47℃ and the ambient humidity at 85% for initial curing. The initial curing time is 23 hours. After the initial curing time is completed, demold the concrete and perform a second curing. Control the second curing temperature at 27℃ and the second curing humidity at 65% for 27 days. After the second curing, the photosensitive concrete is obtained.

[0049] Example 5: A photosensitive concrete, composed of the following components in parts by weight:

[0050] The composition includes 70 parts cement; 15 parts fine aggregate; 8 parts coarse aggregate; 5 parts photosensitive material; 2 parts water-reducing agent; 3 parts expanding agent; 1 part dispersant; and 0.5 parts stabilizer. The photosensitive material consists of sodium peroxide and Keggin-type polyacid, with a weight ratio of sodium peroxide to Keggin-type polyacid of 5:1.

[0051] A method for preparing photosensitive concrete includes the following preparation steps:

[0052] Preparation of S1 photosensitizing agent solution: Sodium peroxide was added to the reactor, and then deionized water was added and stirred. The mass ratio of sodium peroxide to deionized water was 1:25. The stirring speed of the reactor was 1000 rpm. After the sodium peroxide was completely dissolved, Keggin type polyacid was added and stirred evenly. After stirring for 60 min, a dispersant was added and stirring was continued for 15 min. After stirring was completed, a mixture was obtained. The mixture was transferred to an ultrasonic mixer. The ultrasonic frequency of the ultrasonic mixer was set to 50 kHz. After adding a stabilizer, ultrasonic treatment was started. The ultrasonic treatment time was 40 min. After ultrasonic treatment was completed, the photosensitizing agent solution was obtained.

[0053] Preparation of S2 photosensitive concrete: First, clean and dry the fine aggregate and coarse aggregate. Then, add the cement, fine aggregate and coarse aggregate to the mixing mixer in sequence. Set the speed of the mixer to 400 rpm and mix at low speed for 10 minutes until completely mixed. Then, slowly add the photosensitive functional agent solution prepared in S1 to the mixing mixer. After the addition is completed, increase the speed of the mixing mixer to 1000 rpm. Mix the materials in the mixer evenly and then add the water-reducing agent and the expansion agent. Continue to mix at the original speed for 3 hours to finally form photosensitive concrete paste.

[0054] S3 Molding and Curing: Pour the photosensitive concrete slurry obtained in step S2 into the mold, vibrate to compact it to prevent air bubbles, and control the ambient temperature at 50℃ and the ambient humidity at 90% for initial curing. The initial curing time is 25 hours. After the initial curing time is completed, demold the concrete and then perform a second curing. Control the second curing temperature at 30℃ and the second curing humidity at 70% for 30 days. After the second curing, the photosensitive concrete is obtained.

[0055] Example 6: The Keggin-type polyacid in the raw materials was replaced with Dawson-type polyacid, and the other raw materials were the same as in Example 3. The preparation method and parameters were also the same as in Example 3.

[0056] Example 7: The Keggin-type polyacid in the raw materials was replaced with the Anderson-type polyacid, and the other raw materials were the same as in Example 3. The preparation method and parameters were also the same as in Example 3.

[0057] Example 8: A photosensitive concrete, composed of the following components in parts by weight:

[0058] The composition includes 60 parts cement; 12 parts fine aggregate; 6 parts coarse aggregate; 4 parts photosensitive material; 1.4 parts water-reducing agent; 2 parts expanding agent; 0.7 parts dispersant; and 0.4 parts stabilizer. The photosensitive material consists of sodium peroxide and Keggin-type polyacid, with a weight ratio of sodium peroxide to Keggin-type polyacid of 4:1.

[0059] A method for preparing photosensitive concrete includes the following preparation steps:

[0060] Preparation of S1 photosensitizing agent solution: Sodium peroxide and Keggin-type polyacid were added to the reactor, and then deionized water was added and stirred. The mass ratio of sodium peroxide to deionized water was 1:20. The stirring speed of the reactor was 900 rpm. After the sodium peroxide and Keggin-type polyacid were completely dissolved, dispersant and stabilizer were added and stirring was continued for 42 min. After stirring was completed, the photosensitizing agent solution was obtained.

[0061] Preparation of S2 photosensitive concrete: First, clean and dry the fine aggregate and coarse aggregate. Then, add the cement, fine aggregate and coarse aggregate to the mixing mixer in sequence. Set the speed of the mixer to 300 rpm and mix at low speed for 7 minutes until completely mixed. Then, slowly add the photosensitive functional agent solution prepared in S1 to the mixing mixer. After the addition is completed, increase the speed of the mixing mixer to 800 rpm and mix the materials in the mixer evenly. Then add the water-reducing agent and the expansion agent and continue to mix at the original speed for 2.5 hours to finally form the photosensitive concrete paste.

[0062] S3 Molding and Curing: Pour the photosensitive concrete slurry obtained in step S2 into the mold, vibrate to compact it to prevent air bubbles, and control the ambient temperature at 45℃ and the ambient humidity at 85% for initial curing. The initial curing time is 22 hours. After the initial curing time is completed, demold the concrete and perform a second curing. Control the second curing temperature at 25℃ and the second curing humidity at 65% for 25 days. After the second curing, the photosensitive concrete is obtained.

[0063] Example 9: A photosensitive concrete, composed of the following components in parts by weight:

[0064] The composition includes 65 parts cement; 14 parts fine aggregate; 7 parts coarse aggregate; 4.5 parts photosensitive material; 1.7 parts water-reducing agent; 2.5 parts expanding agent; 0.85 parts dispersant; and 0.45 parts stabilizer. The photosensitive material is titanium dioxide.

[0065] A method for preparing photosensitive concrete includes the following preparation steps:

[0066] Preparation of S1 photosensitizing agent solution: Titanium dioxide was added to the reactor, and then deionized water was added and stirred. The mass ratio of sodium peroxide to deionized water was 1:23. The stirring speed of the reactor was 950 rpm. After the titanium dioxide was stirred and mixed evenly, a dispersant was added and stirring was continued for 13 min. After stirring was completed, a mixture was obtained. The mixture was transferred to an ultrasonic mixer. The ultrasonic frequency of the ultrasonic mixer was set to 40 kHz. After adding a stabilizer, ultrasonic treatment was started. The ultrasonic treatment time was 35 min. After ultrasonic treatment was completed, the photosensitizing agent solution was obtained.

[0067] Preparation of S2 photosensitive concrete: First, clean and dry the fine aggregate and coarse aggregate. Then, add the cement, fine aggregate and coarse aggregate to the mixing mixer in sequence. Set the speed of the mixer to 350 rpm and mix at low speed for 8 minutes until completely mixed. Then, slowly add the photosensitive functional agent solution prepared in S1 to the mixing mixer. After the addition is completed, increase the speed of the mixing mixer to 900 rpm. Mix the materials in the mixer evenly and then add the water-reducing agent and the expansion agent. Continue to mix at the original speed for 2.5 hours to finally form photosensitive concrete paste.

[0068] S3 Molding and Curing: Pour the photosensitive concrete slurry obtained in step S2 into the mold, vibrate to compact it to prevent air bubbles, and control the ambient temperature at 47℃ and the ambient humidity at 85% for initial curing. The initial curing time is 23 hours. After the initial curing time is completed, demold the concrete and perform a second curing. Control the second curing temperature at 27℃ and the second curing humidity at 65% for 27 days. After the second curing, the photosensitive concrete is obtained.

[0069] Example 10: A type of concrete, composed of the following components in parts by weight:

[0070] 60 parts cement; 12 parts fine aggregate; 6 parts coarse aggregate; 1.4 parts water-reducing agent; 2 parts expansion agent; 0.7 parts dispersant; 0.4 parts stabilizer.

[0071] A method for preparing concrete includes the following preparation steps:

[0072] (1) Concrete preparation: First, clean and dry the fine aggregate and coarse aggregate. Then, add the cement, fine aggregate and coarse aggregate to the mixing mixer in sequence. Set the speed of the mixer to 300 rpm and mix at low speed for 7 minutes until fully mixed. Then, slowly add the dispersant and stabilizer liquid to the mixing mixer. After the addition is completed, increase the speed of the mixing mixer to 800 rpm. Mix the materials in the mixer evenly and then add the water-reducing agent and expansion agent. Continue to mix at the original speed for 2.5 hours to finally form concrete paste.

[0073] (2) Molding and curing: Pour the photosensitive concrete slurry obtained in step (1) into the mold, vibrate to compact it to prevent air bubbles from being generated, control the ambient temperature at 45℃ and the ambient humidity at 85% for initial curing, the initial curing time is 22h, after the initial curing time is over, demold, and then carry out secondary curing, control the secondary curing temperature at 25℃ and the secondary curing humidity at 65%, the secondary curing time is 25d, and after the secondary curing, concrete is obtained.

[0074] The performance of the photosensitive concrete prepared in Examples 1-9 and the concrete prepared in Example 10 were tested, and the test results are shown in the table below:

[0075]

[0076] As shown in the table above, Examples 1-5 screened the parameters in the preparation method, with the photosensitive concrete obtained in Examples 3-4 exhibiting the best performance. Examples 4, 6-7, and 9 screened the types of photosensitive materials. The data in the table shows that the photosensitive concrete prepared in Examples 4 and 6-7 had better performance, while the photosensitive concrete prepared in Example 9 had low compressive strength, poor frost resistance and corrosion resistance, and high carbonation depth. Examples 4 and 8 screened the method and order of adding photosensitive materials during the preparation of the S1 photosensitive functional agent solution. The test data in the table shows that the photosensitive concrete in Example 4 performed better than that in Example 9.

[0077] The photosensitive concrete prepared in Examples 1-9 and the concrete prepared in Example 10 were tested for toluene-like organic compounds in the air. The initial toluene content in the ambient air was 5.2 mg / m³. The toluene content in the ambient air was measured after the above concrete was placed in the environment for 1 day, 5 days, and 15 days. The test results are shown in the table below:

[0078]

[0079] As can be seen from the experimental data in the table above, the photosensitive concrete prepared by the preparation method provided by this invention has the function of purifying the environment. Among them, the mixture of sodium peroxide and polyacid-based inorganic photosensitizer has the best purification effect.

[0080] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A photosensitive concrete, characterized in that, It consists of the following components in parts by weight: 50-70 parts cement; 10-15 parts fine aggregate; 5-8 parts coarse aggregate; 3-5 parts photosensitive material; 1-2 parts water-reducing agent; 1-3 parts expanding agent; 0.5-1 part dispersant; 0.3-0.5 parts stabilizer; The photosensitive material is sodium peroxide and a polyacid-based inorganic photosensitizer; The weight ratio of the polyacid-based inorganic photosensitizer to sodium peroxide is 1:(3~5).

2. The photosensitive concrete according to claim 1, characterized in that, The polyacid-based inorganic photosensitizer is a Keggin-type polyacid, a Dawson-type polyacid, or an Anderson-type polyacid.

3. The method for preparing photosensitive concrete according to claim 1, characterized in that, The preparation steps include the following: Preparation of S1 photosensitizing agent solution: Sodium peroxide is added to the reactor, then deionized water is added and stirred. After the sodium peroxide is completely dissolved, polyacid-based inorganic photosensitizer is added and stirred evenly for 30-60 minutes. Then, a dispersant is added and stirring is continued for 10-15 minutes. After stirring is completed, a mixture is obtained. The mixture is transferred to an ultrasonic mixer, a stabilizer is added, and ultrasonic treatment is started. After ultrasonic treatment is completed, a photosensitizing agent solution is obtained. Preparation of S2 photosensitive concrete: First, clean and dry the fine aggregate and coarse aggregate. Then, add the cement, fine aggregate and coarse aggregate to the mixing mixer in sequence. Mix at low speed until completely mixed. Then, slowly add the photosensitive functional agent solution prepared in S1 to the mixing mixer. After the addition is completed, increase the speed of the mixing mixer and mix evenly. Then add the water-reducing agent and expansion agent and continue to mix at the original speed to finally form photosensitive concrete paste. S3 Molding and Curing: Pour the photosensitive concrete slurry obtained in step S2 into the mold, vibrate to compact it to prevent air bubbles, control the ambient temperature and humidity for initial curing, demold after the initial curing time is over, and then perform secondary curing. After secondary curing, the photosensitive concrete is obtained.

4. The method for preparing photosensitive concrete according to claim 3, characterized in that, In the preparation step of the S1 photosensitizing agent solution, the mass ratio of sodium peroxide to deionized water is 1:(15~25).

5. The method for preparing photosensitive concrete according to claim 3, characterized in that, In the preparation step of the S1 photosensitizing functional agent solution, the stirring speed of the reactor is 800~1200 rpm; the ultrasonic frequency of the ultrasonic mixer is 20~50 kHz; and the ultrasonic treatment time is 20~40 min.

6. The method for preparing photosensitive concrete according to claim 3, characterized in that, In the S2 photosensitive concrete preparation step, the mixing speed in the mixing mixer is 200~400 rpm; after the photosensitive functional solution is added, the speed of the mixing mixer is increased to 600~1000 rpm.

7. The method for preparing photosensitive concrete according to claim 3, characterized in that, In the S3 molding and curing process, the ambient temperature during the initial curing is 40~50℃; the ambient humidity is 80~90%; and the initial curing time is 20~25h.

8. The method for preparing photosensitive concrete according to claim 3, characterized in that, In the S3 molding and curing process, the ambient temperature during the secondary curing is 20~30℃; the ambient humidity is 60~70%; and the secondary curing time is 25~30 days.

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