Photosensitive concrete and preparation method thereof

Abstract

The invention relates to the field of concrete preparation, in particular to photosensitive concrete and a preparation method thereof. The photosensitive concrete provided by the invention is prepared from the following raw materials in parts by weight: 50 to 70 parts of cement; 10 to 15 parts of fine aggregate; 5-8 parts of coarse aggregate; 3-5 parts of a photosensitive material; 1-2 parts of a water reducing agent; 1-3 parts of an expanding agent; 0.5-1 part of a dispersant; and 0.3-0.5 part of a stabilizing agent. The light-sensitive material is added into the raw materials, so that the concrete has certain light sensitivity to purify air and improve corrosion resistance. The invention also provides a preparation method of the photosensitive concrete, which comprises the following three steps: S1, preparation of a photosensitive functional agent solution, S2, preparation of the photosensitive concrete, and S3, forming and curing, the method effectively overcomes the defects that the doping amount of the photosensitive material is not uniform, and the concrete is high in porosity and easy to absorb water by optimizing the doping mode of the photosensitive material and the composition of the concrete; the corrosion resistance and the photocatalytic efficiency of the concrete are improved, and the concrete can also be used for preparing a novel wall material or a light building material.

Description

Technical Field

[0001] The present invention relates to the field of concrete preparation, and particularly to a photosensitive concrete and a preparation method thereof. Background Art

[0002] Concrete, as an indispensable basic material in the construction industry, is widely used globally due to its good durability, plasticity, and economy. However, during long-term use, traditional concrete materials are vulnerable to environmental erosion, such as the penetration of pollutants in the air and water erosion, resulting in a decline in the indoor air quality of buildings and even affecting the health of occupants. In addition, with the acceleration of the urbanization process, the airtightness of buildings has increased, and harmful gases (such as formaldehyde, benzene, etc.) released by indoor decoration materials are difficult to effectively discharge, further exacerbating the air environment problems in buildings.

[0003] Photocatalysis technology, as a cutting-edge scientific and technological means, ingeniously utilizes light energy to drive catalytic reactions without the need for additional chemical energy input, demonstrating unique advantages of high efficiency and environmental friendliness. This technology can not only promote the rate of chemical reactions but also reduce the generation of harmful substances during the reaction process, being environmentally friendly and sustainable. In recent years, with the improvement of people's awareness of the quality of life and environmental protection, photocatalysis technology has received extensive attention and application in multiple fields such as air purification, water treatment, and self-cleaning, with remarkable results. However, despite the great potential of photocatalysis technology, its traditional application form is powdered photocatalytic materials, and there are many challenges in large-scale applications in actual projects. These powdered materials are not only difficult to be evenly distributed and are prone to loss, but may also cause environmental pollution during construction and maintenance, restricting their application scope. Therefore, exploring new carrier materials to achieve the stable and efficient application of photocatalysis technology has become an important research direction.

[0004] Combining photocatalysis technology with concrete materials provides a new idea for solving the above problems. By reasonably incorporating photosensitive materials into concrete, photocatalytically active concrete can be prepared. This new type of concrete can decompose harmful substances in the air, such as formaldehyde, benzene, etc., under light conditions, effectively purify indoor air, and improve the building microenvironment; it can also be used to prepare new wall materials or lightweight building materials. Therefore, photosensitive concrete has great development prospects. Summary of the Invention

[0005] In view of the above existing technical problems, a photosensitive concrete and a preparation method thereof are provided. The photosensitive concrete prepared by this method has good compressive strength, frost resistance, corrosion resistance, and a relatively low carbonation depth, and at the same time has the ability to purify air and absorb organic substances such as toluene in the air.

[0006] The present invention discloses a photosensitive concrete, which is composed of the following components in parts by weight: 50 - 70 parts of cement; 10 - 15 parts of fine aggregate; 5 - 8 parts of coarse aggregate; 3 - 5 parts of photosensitive material; 1 - 2 parts of water reducing agent; 1 - 3 parts of expansive agent; 0.5 - 1 part of dispersant; 0.3 - 0.5 part of stabilizer; Among them, the photosensitive material is sodium peroxide and polyacid - based inorganic photosensitizer.

[0007] Preferably, the weight ratio of the polyacid - based inorganic photosensitizer to sodium peroxide is 1:(3 - 5).

[0008] Preferably, the polyacid - based inorganic photosensitizer is Keggin - type polyacid, Dawson - type polyacid or Anderson - type polyacid.

[0009] The present invention also discloses a preparation method of photosensitive concrete, including the following preparation steps: S1 Preparation of photosensitive functional agent solution: Add sodium peroxide to a reactor, then add deionized water and stir to mix. After sodium peroxide is completely dissolved, add the polyacid - based inorganic photosensitizer and stir to mix evenly, and continue stirring for 30 - 60 min. Then add the dispersant and continue stirring for 10 - 15 min. After the stirring ends, obtain a mixed solution. Transfer the mixed solution to an ultrasonic mixer, add the stabilizer and start ultrasonic treatment. After the ultrasonic treatment ends, obtain the photosensitive functional agent solution; S2 Preparation of photosensitive concrete: First, wash and dry the fine aggregate and the coarse aggregate. Then, add cement, the fine aggregate and the coarse aggregate to a mixing and stirring machine in sequence. Stir at a low speed until completely mixed. Slowly add the photosensitive functional agent solution prepared in S1 to the above - mentioned mixing and stirring machine. After the addition is completed, increase the rotation speed of the mixing and stirring machine to mix evenly, then add the water reducing agent and the expansive agent, and continue to stir at the original speed to finally form a photosensitive concrete slurry; S3 Molding and curing: Pour the photosensitive concrete slurry obtained in step S2 into a mold, vibrate and compact it to prevent the generation of bubbles. Control the environmental temperature and humidity for initial curing. After the initial curing time ends, demold. After demolding, perform secondary curing. After the secondary curing, obtain the photosensitive concrete.

[0010] Preferably, in the step S1 of preparing the photosensitive functional agent solution, the mass ratio of sodium peroxide to deionized water is 1:(15 - 25).

[0011] Preferably, in the step S1 of preparing the photosensitive functional agent solution, the stirring speed of the reactor is 800 - 1200 rpm; the ultrasonic frequency of the ultrasonic mixer is 20 - 50 kHz; the time of ultrasonic treatment is 20 - 40 min.

[0012] Preferably, in the step of preparing photosensitive concrete in S2, the speed of low-speed stirring in the mixing blender is 200-400 rpm; the stirring time is 5-10 min; after adding the photosensitive functional solution, the rotation speed of the mixing blender is increased to 600-1000 rpm.

[0013] Preferably, in the step of forming and curing in S3, the ambient temperature during initial curing is 40-50 °C; the ambient humidity is 80-90%; the initial curing time is 20-25 h.

[0014] Preferably, in the step of forming and curing in S3, the ambient temperature during secondary curing is 20-30 °C; the ambient humidity is 60-70%; the secondary curing time is 25-30 d.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The present invention provides a photosensitive concrete. The raw materials of this photosensitive concrete are composed of cement, fine aggregate, coarse aggregate, photosensitive material, water reducing agent, expansion agent, dispersant and stabilizer. The addition of the photosensitive material makes the concrete have certain photosensitivity. Under light conditions, a photocatalytic reaction occurs to decompose harmful substances in the air, effectively purifying the indoor air and improving the building microenvironment. Through photocatalysis, the erosion of the concrete surface by environmental pollutants (such as acidic rainwater, chlorides, etc.) can be reduced, thereby improving the corrosion resistance of the concrete and the long-term durability of the concrete; it can be used to prepare new wall materials or lightweight building materials.

[0016] The present invention also provides a preparation method of photosensitive concrete. When preparing the photosensitive functional agent solution, after adding the stabilizer, the ultrasonic mixer is used to disperse the photosensitive material in the photosensitive functional agent solution evenly. After the base material is mixed evenly, the photosensitive functional agent solution, water reducing agent and expansion agent are added. By optimizing the incorporation method of the photosensitive material and the composition of the concrete, the disadvantages of uneven incorporation amount of the photosensitive material and high porosity of the concrete prone to water absorption are effectively solved, and the corrosion resistance and photocatalytic efficiency of the concrete are improved. Specific embodiments

[0017] The following embodiments are provided to better further understand the present invention, which is not limited to the best embodiment, and does not limit the content and protection scope of the present invention. Any product that is the same as or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with other prior art features falls within the protection scope of the present invention.

[0018] For those steps or conditions not specified in the examples, the operations or conditions of the conventional experimental steps described in the literature in this field can be followed. For the reagents or instruments not specified by the manufacturer, they are all conventional reagent products that can be obtained through commercial purchase.

[0019] Example 1: A photosensitive concrete, which is composed of the following components in parts by weight: Cement: 50 parts; fine aggregate: 10 parts; coarse aggregate: 5 parts; photosensitive material: 3 parts; water reducing agent: 1 part; expansive agent: 1 part; dispersant: 0.5 part; stabilizer: 0.3 part. Among them, the photosensitive material is sodium peroxide and Keggin-type polyacid, and the weight ratio of sodium peroxide to Keggin-type polyacid is 3:1.

[0020] A preparation method of the photosensitive concrete includes the following preparation steps: S1 Preparation of photosensitive functional agent solution: Add sodium peroxide to the reactor, and then add deionized water and stir to mix. The mass ratio of sodium peroxide to deionized water is 1:15; the stirring speed of the reactor is 800 rpm; after sodium peroxide is completely dissolved, add Keggin-type polyacid and stir to mix evenly, and continue stirring for 30 min. Then add the dispersant and continue stirring for 10 min. After the stirring is completed, obtain the mixed solution. Transfer the mixed solution to an ultrasonic mixer, set the ultrasonic frequency of the ultrasonic mixer to 20 kHz, add the stabilizer and start ultrasonic treatment. The ultrasonic treatment time is 20 min. After the ultrasonic treatment is completed, obtain the photosensitive functional agent solution; S2 Preparation of photosensitive concrete: First, wash and dry the fine aggregate and coarse aggregate, and then add cement, fine aggregate and coarse aggregate to the mixing and stirring machine in sequence. Set the rotation speed of the mixer to 200 rpm and stir at low speed for 5 min for complete mixing. Then slowly add the photosensitive functional agent solution prepared in S1 to the above mixing and stirring machine. After the addition is completed, increase the rotation speed of the mixing and stirring machine to 600 rpm. After the materials in the mixer are mixed evenly, add the water reducing agent and the expansive agent, and continue to stir at the original speed for 2 h to finally form the photosensitive concrete slurry; S3 Molding and curing: Pour the photosensitive concrete slurry obtained in step S2 into the mold, vibrate and compact it to prevent the generation of bubbles. Control the environmental temperature at 40 °C and the environmental humidity at 80% for initial curing. The initial curing time is 20 h. After the initial curing time is over, demold. After demolding, perform secondary curing. Control the secondary curing temperature at 20 °C and the secondary curing humidity at 60%. The secondary curing time is 20 d. After the secondary curing, obtain the photosensitive concrete.

[0021] Example 2: A photosensitive concrete, which is composed of the following components in parts by weight: Cement: 55 parts; fine aggregate: 11 parts; coarse aggregate: 5.5 parts; photosensitive material: 3.5 parts; water reducing agent: 1.2 parts; expansive agent: 1.5 parts; dispersant: 0.6 part; stabilizer: 0.35 part. Among them, the photosensitive material is sodium peroxide and Keggin-type polyacid, and the weight ratio of sodium peroxide to Keggin-type polyacid is 3.5:1.

[0022] A preparation method of photosensitive concrete, comprising the following preparation steps: S1 Preparation of photosensitive functional agent solution: Add sodium peroxide to a reactor, and then add deionized water and stir to mix. The mass ratio of sodium peroxide to deionized water is 1:17; the stirring speed of the reactor is 850 rpm; after the sodium peroxide is completely dissolved, add Keggin-type polyacid and stir to mix evenly, and continue stirring for 40 min. Then add a dispersant and continue stirring for 11 min. After the stirring is completed, a mixed solution is obtained. Transfer the mixed solution to an ultrasonic mixer, set the ultrasonic frequency of the ultrasonic mixer to 25 kHz, add a stabilizer and start ultrasonic treatment. The ultrasonic treatment time is 25 min. After the ultrasonic treatment is completed, a photosensitive functional agent solution is obtained; S2 Preparation of photosensitive concrete: First, wash and dry the fine aggregate and coarse aggregate, and then sequentially add cement, fine aggregate and coarse aggregate to a mixing and stirring machine. Set the rotation speed of the mixer to 250 rpm and stir at a low speed for 5 min to mix completely. Then slowly add the photosensitive functional agent solution prepared in S1 to the above mixing and stirring machine. After the addition is completed, increase the rotation speed of the mixing and stirring machine to 700 rpm. After mixing the materials in the mixer evenly, add a water reducing agent and an expansion agent, and continue to stir at the original speed for 2.2 h to finally form a photosensitive concrete slurry; S3 Molding and curing: Pour the photosensitive concrete slurry obtained in step S2 into a mold, vibrate and compact it to prevent air bubbles from generating. Control the environmental temperature to be 42 °C and the environmental humidity to be 80% for initial curing. The initial curing time is 21 h. After the initial curing time is over, demold, and then perform secondary curing. Control the secondary curing temperature to be 22 °C and the secondary curing humidity to be 60%. The secondary curing time is 22 d. After the secondary curing, photosensitive concrete is obtained.

[0023] Example 3: A photosensitive concrete, composed of the following components in parts by weight: 60 parts of cement; 12 parts of fine aggregate; 6 parts of coarse aggregate; 4 parts of photosensitive material; 1.4 parts of water reducing agent; 2 parts of expansion agent; 0.7 part of dispersant; 0.4 part of stabilizer. Among them, the photosensitive material is sodium peroxide and Keggin-type polyacid, and the weight ratio of sodium peroxide to Keggin-type polyacid is 4:1.

[0024] A preparation method of photosensitive concrete, comprising the following preparation steps: Preparation of S1 photosensitive functional agent solution: Add sodium peroxide to the reactor, and then add deionized water and stir to mix. The mass ratio of sodium peroxide to deionized water is 1:20. The stirring speed of the reactor is 900 rpm. After the sodium peroxide is completely dissolved, add Keggin-type polyacid and stir to mix evenly, and continue stirring for 50 minutes. Then add a dispersant and continue stirring for 12 minutes. After the stirring is completed, a mixed solution is obtained. Transfer the mixed solution to an ultrasonic mixer, set the ultrasonic frequency of the ultrasonic mixer to 30 kHz, add a stabilizer and then start ultrasonic treatment. The ultrasonic treatment time is 30 minutes. After the ultrasonic treatment is completed, a photosensitive functional agent solution is obtained. Preparation of S2 photosensitive concrete: First, wash and dry the fine aggregate and coarse aggregate. Then, add cement, fine aggregate, and coarse aggregate to the mixing blender in sequence. Set the rotation speed of the mixer to 300 rpm and stir at a low speed for 7 minutes until completely mixed. Then, slowly add the photosensitive functional agent solution prepared in S1 to the above mixing blender. After the addition is completed, increase the rotation speed of the mixing blender to 800 rpm. After the materials in the mixer are mixed evenly, add a water reducing agent and an expansion agent, and continue to stir at the original speed for 2.5 hours to finally form a photosensitive concrete slurry. S3 Molding and curing: Pour the photosensitive concrete slurry obtained in step S2 into a mold, vibrate and compact it to prevent air bubbles from generating. Control the environmental temperature at 45 °C and the environmental humidity at 85% for initial curing. The initial curing time is 22 hours. After the initial curing time is completed, demold. After demolding, perform secondary curing. Control the secondary curing temperature at 25 °C and the secondary curing humidity at 65%. The secondary curing time is 25 days. After the secondary curing, photosensitive concrete is obtained.

[0025] Example 4: A photosensitive concrete is composed of the following components in parts by weight: Cement 65 parts; fine aggregate 14 parts; coarse aggregate 7 parts; photosensitive material 4.5 parts; water reducing agent 1.7 parts; expansion agent 2.5 parts; dispersant 0.85 parts; stabilizer 0.45 parts. Among them, the photosensitive material is sodium peroxide and Keggin-type polyacid, and the weight ratio of sodium peroxide to Keggin-type polyacid is 4.5:1.

[0026] A preparation method of a photosensitive concrete includes the following preparation steps: Preparation of S1 photosensitive functional agent solution: Add sodium peroxide into a reactor, and then add deionized water and stir to mix. The mass ratio of sodium peroxide to deionized water is 1:23. The stirring speed of the reactor is 950 rpm. After sodium peroxide is completely dissolved, add Keggin-type polyacid and stir to mix evenly, and continue stirring for 55 min. Then add a dispersant and continue stirring for 13 min. After stirring ends, obtain a mixed solution. Transfer the mixed solution to an ultrasonic mixer, set the ultrasonic frequency of the ultrasonic mixer to 40 kHz, add a stabilizer and then start ultrasonic treatment. The ultrasonic treatment time is 35 min. After ultrasonic treatment ends, obtain the photosensitive functional agent solution. Preparation of S2 photosensitive concrete: First, wash and dry the fine aggregate and coarse aggregate. Then, add cement, fine aggregate, and coarse aggregate into a mixing blender in sequence. Set the rotation speed of the blender to 350 rpm and stir at a low speed for 8 min until completely mixed. Then, slowly add the photosensitive functional agent solution prepared in S1 into the above mixing blender. After the addition is completed, increase the rotation speed of the mixing blender to 900 rpm. After mixing the materials in the blender evenly, add a water reducing agent and an expansion agent, and continue to stir at the original speed for 2.5 h to finally form a photosensitive concrete slurry. Molding and curing: Pour the photosensitive concrete slurry obtained in step S2 into a mold, vibrate and compact it to prevent air bubbles from generating. Control the environmental temperature at 47 °C and the environmental humidity at 85% for initial curing. The initial curing time is 23 h. After the initial curing time ends, demold. After demolding, perform secondary curing. Control the secondary curing temperature at 27 °C and the secondary curing humidity at 65%. The secondary curing time is 27 d. After secondary curing, obtain the photosensitive concrete.

[0027] Example 5: A photosensitive concrete is composed of the following components in parts by weight: Cement 70 parts; fine aggregate 15 parts; coarse aggregate 8 parts; photosensitive material 5 parts; water reducing agent 2 parts; expansion agent 3 parts; dispersant 1 part; stabilizer 0.5 part. Among them, the photosensitive material is sodium peroxide and Keggin-type polyacid, and the weight ratio of sodium peroxide to Keggin-type polyacid is 5:1.

[0028] A preparation method of a photosensitive concrete includes the following preparation steps: Preparation of S1 photosensitive functional agent solution: Add sodium peroxide to the reactor, and then add deionized water and stir to mix. The mass ratio of sodium peroxide to deionized water is 1:25; the stirring speed of the reactor is 1000 rpm; after the sodium peroxide is completely dissolved, add Keggin-type polyacid and stir to mix evenly, and continue to stir for 60 min. Then add a dispersant and continue to stir for 15 min. After the stirring is completed, a mixed solution is obtained. Transfer the mixed solution to an ultrasonic mixer, set the ultrasonic frequency of the ultrasonic mixer to 50 kHz, add a stabilizer and then start ultrasonic treatment. The ultrasonic treatment time is 40 min. After the ultrasonic treatment is completed, a photosensitive functional agent solution is obtained; S2 Preparation of photosensitive concrete: First, wash and dry the fine aggregate and coarse aggregate, and then add cement, fine aggregate and coarse aggregate to the mixing blender in sequence. Set the rotation speed of the mixer to 400 rpm and stir at a low speed for 10 min until completely mixed. Then slowly add the photosensitive functional agent solution prepared in S1 to the above mixing blender. After the addition is completed, increase the rotation speed of the mixing blender to 1000 rpm. After the materials in the mixer are mixed evenly, add a water reducing agent and an expansion agent, and continue to stir at the original speed for 3 h to finally form a photosensitive concrete slurry; S3 Molding and curing: Pour the photosensitive concrete slurry obtained in step S2 into a mold, vibrate and compact it to prevent the generation of bubbles. Control the environmental temperature at 50 °C and the environmental humidity at 90% for initial curing. The initial curing time is 25 h. After the initial curing time is over, demold, and then perform secondary curing. Control the secondary curing temperature at 30 °C and the secondary curing humidity at 70%. The secondary curing time is 30 d. After the secondary curing, photosensitive concrete is obtained.

[0029] Example 6: Replace the Keggin-type polyacid in the raw materials with Dawson-type polyacid, and the rest of the raw materials are the same as those in Example 3. The preparation method and parameters are the same as those in Example 3.

[0030] Example 7: Replace the Keggin-type polyacid in the raw materials with Anderson-type polyacid, and the rest of the raw materials are the same as those in Example 3. The preparation method and parameters are the same as those in Example 3.

[0031] Example 8: A photosensitive concrete is composed of the following components in parts by weight: Cement 60 parts; fine aggregate 12 parts; coarse aggregate 6 parts; photosensitive material 4 parts; water reducing agent 1.4 parts; expansion agent 2 parts; dispersant 0.7 parts; stabilizer 0.4 parts. Among them, the photosensitive material is sodium peroxide and Keggin-type polyacid, and the weight ratio of sodium peroxide to Keggin-type polyacid is 4:1.

[0032] A preparation method of photosensitive concrete includes the following preparation steps: Preparation of S1 photosensitive functional agent solution: Add sodium peroxide and Keggin-type polyacid to a reactor, and then add deionized water and stir to mix. The mass ratio of sodium peroxide to deionized water is 1:20; the stirring speed of the reactor is 900 rpm; after sodium peroxide and Keggin-type polyacid are completely dissolved, add a dispersant and a stabilizer and continue stirring for 42 min. After the stirring is completed, a photosensitive functional agent solution is obtained; Preparation of S2 photosensitive concrete: First, wash and dry the fine aggregate and coarse aggregate, and then add cement, fine aggregate, and coarse aggregate to a mixing blender in sequence. Set the rotation speed of the blender to 300 rpm and stir at a low speed for 7 min until completely mixed. Then, slowly add the photosensitive functional agent solution prepared in S1 to the above mixing blender. After the addition is completed, increase the rotation speed of the mixing blender to 800 rpm. After the materials in the blender are mixed evenly, add a water reducing agent and an expansion agent, and continue to stir at the original speed for 2.5 h to finally form a photosensitive concrete slurry; S3 Molding and curing: Pour the photosensitive concrete slurry obtained in step S2 into a mold, vibrate and compact it to prevent the generation of bubbles. Control the environmental temperature at 45 °C and the environmental humidity at 85% for initial curing. The initial curing time is 22 h. After the initial curing time ends, demold. After demolding, perform secondary curing. Control the secondary curing temperature at 25 °C and the secondary curing humidity at 65%. The secondary curing time is 25 d. After secondary curing, photosensitive concrete is obtained.

[0033] Example 9: A photosensitive concrete is composed of the following components in parts by weight: 65 parts of cement; 14 parts of fine aggregate; 7 parts of coarse aggregate; 4.5 parts of photosensitive material; 1.7 parts of water reducing agent; 2.5 parts of expansion agent; 0.85 part of dispersant; 0.45 part of stabilizer. Among them, the photosensitive material is titanium dioxide.

[0034] A preparation method of a photosensitive concrete includes the following preparation steps: S1 Photosensitive functional agent solution preparation: Add titanium dioxide to a reactor, and then add deionized water and stir to mix. The mass ratio of sodium peroxide to deionized water is 1:23; the stirring speed of the reactor is 950 rpm; after titanium dioxide is stirred and mixed evenly, add a dispersant and continue stirring for 13 min. After the stirring is completed, transfer the mixture to an ultrasonic mixer. Set the ultrasonic frequency of the ultrasonic mixer to 40 kHz. After adding a stabilizer, start ultrasonic treatment. The ultrasonic treatment time is 35 min. After the ultrasonic treatment is completed, a photosensitive functional agent solution is obtained; Preparation of S2 photosensitive concrete: First, wash and dry the fine aggregate and coarse aggregate, then sequentially add cement, fine aggregate, and coarse aggregate to a mixing blender. Set the rotation speed of the blender to 350 rpm and stir at a low speed for 8 minutes until completely mixed. Then, slowly add the photosensitive functional agent solution prepared in S1 to the above mixing blender. After the addition is complete, increase the rotation speed of the mixing blender to 900 rpm. After mixing the materials in the blender evenly, add water reducing agent and expansion agent, and continue to stir at the original speed for 2.5 hours to finally form a photosensitive concrete slurry. S3 Molding and curing: Pour the photosensitive concrete slurry obtained in step S2 into a mold, vibrate and compact it to prevent the generation of bubbles. Control the environmental temperature at 47 °C and the environmental humidity at 85% for initial curing. The initial curing time is 23 hours. After the initial curing time ends, demold, and then perform secondary curing. Control the secondary curing temperature at 27 °C and the secondary curing humidity at 65%. The secondary curing time is 27 days. After secondary curing, photosensitive concrete is obtained.

[0035] Example 10: A kind of concrete, which is composed of the following components in parts by weight: 60 parts of cement; 12 parts of fine aggregate; 6 parts of coarse aggregate; 1.4 parts of water reducing agent; 2 parts of expansion agent; 0.7 part of dispersant; 0.4 part of stabilizer.

[0036] A preparation method of a kind of concrete, which includes the following preparation steps: (1) Concrete preparation: First, wash and dry the fine aggregate and coarse aggregate, then sequentially add cement, fine aggregate, and coarse aggregate to a mixing blender. Set the rotation speed of the blender to 300 rpm and stir at a low speed for 7 minutes until completely mixed. Then, slowly add the dispersant and stabilizer solution to the above mixing blender. After the addition is complete, increase the rotation speed of the mixing blender to 800 rpm. After mixing the materials in the blender evenly, add water reducing agent and expansion agent, and continue to stir at the original speed for 2.5 hours to finally form a concrete slurry. (2) Molding and curing: Pour the photosensitive concrete slurry obtained in step (1) into a mold, vibrate and compact it to prevent the generation of bubbles. Control the environmental temperature at 45 °C and the environmental humidity at 85% for initial curing. The initial curing time is 22 hours. After the initial curing time ends, demold, and then perform secondary curing. Control the secondary curing temperature at 25 °C and the secondary curing humidity at 65%. The secondary curing time is 25 days. After secondary curing, concrete is obtained.

[0037] Perform performance tests on the photosensitive concrete prepared in Examples 1 - 9 and the concrete prepared in Example 10. The test results are shown in the following table:

[0038] According to the above table, Examples 1 to 5 are for screening various parameters in the preparation method. Among them, the performance of the photosensitive concrete obtained in Examples 3 to 4 is the best; Examples 4, 6 to 7, and 9 are for screening the types of photosensitive materials. From the data in the above table, it can be seen that the performance of the photosensitive concrete prepared in Examples 4 and 6 to 7 is better, while the photosensitive concrete prepared in Example 9 has low compressive strength, poor frost resistance and corrosion resistance, and a high carbonation depth. Examples 4 and 8 are for screening the addition method and order of the photosensitive material during the preparation of the photosensitive functional agent solution in Preparation Method S1. From the above test data, it can be seen that the performance of the photosensitive concrete in Example 4 is better than that in Example 9.

[0039] The photosensitive concrete prepared in Examples 1 to 9 and the concrete prepared in Example 10 were tested for the purification of toluene-like organic compounds in the air. The initial content of toluene in the ambient air was 5.2 mg / m³. After placing the above concrete in the environment for 1 d, 5 d, and 15 d, the content of toluene in the ambient air was detected. The test results are shown in the following table:

[0040] From the experimental data in the above table, it can be seen that the photosensitive concrete prepared by the preparation method provided by the present invention has the function of purifying the environment, and the purification effect is the best when the photosensitive material is a mixture of sodium peroxide and a polyacid-based inorganic photosensitive agent.

[0041] Obviously, the above examples are only for clear illustration and not for limiting the implementation mode. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation modes here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A photosensitive concrete, characterized in that: It is composed of the following ingredients in parts by weight: 50~70 parts of cement; 10~15 parts of fine aggregate; 5~8 parts of coarse aggregate; 3~5 parts of photosensitive material; 1~2 parts of water reducing agent; 1~3 parts of expansion agent; 0.5~1 parts of dispersant; 0.3~0.5 parts of stabilizer; Wherein, the photosensitive material is sodium peroxide and a polyacid-based inorganic photosensitizer.

2. The photosensitive concrete according to claim 1, characterized in that: The weight ratio of the polyacid-based inorganic photosensitizer to sodium peroxide is 1:(3-5).

3. 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.

4. A method for preparing photosensitive concrete, characterized in that: The method comprises the following preparation steps: S1 Preparation of photosensitizer solution: sodium peroxide is added to the reactor, and then deionized water is added and stirred to mix. After the sodium peroxide is completely dissolved, a polyacid-based inorganic photosensitizer is added and stirred to mix evenly and continued to stir for 30 to 60 minutes. A dispersant is added and stirred for 10 to 15 minutes. After the stirring is completed, a mixed solution is obtained. The mixed solution is transferred to an ultrasonic mixer, and a stabilizer is added and ultrasonic treatment is started. After the ultrasonic treatment is completed, a photosensitizer solution is obtained. S2 preparation of photosensitive concrete: first wash and dry the fine aggregate and coarse aggregate, then add cement, fine aggregate and coarse aggregate into a mixing mixer in sequence, stir at a low speed until completely mixed, slowly add the photosensitive functional agent solution prepared in S1 into the above mixing mixer, increase the speed of the mixing mixer after the addition is completed, mix evenly, then add the water reducing agent and the expansion agent, continue to stir at the original speed, and finally form a photosensitive concrete slurry; S3 molding and curing: pour the photosensitive concrete slurry obtained in step S2 into a mold, vibrate and compact it to prevent the generation of bubbles, control the ambient temperature and humidity for initial curing, demould after the initial curing time is over, perform secondary curing after demoulding, and obtain photosensitive concrete after secondary curing.

5. A method for preparing photosensitive concrete according to claim 4, characterized in that: In the S1 photosensitizer solution preparation step, the mass ratio of sodium peroxide to deionized water is 1:(15-25).

6. A method for preparing photosensitive concrete according to claim 4, characterized in that: In the S1 photosensitizer 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.

7. The method for preparing photosensitive concrete according to claim 4, characterized in that: In the S2 photosensitive concrete preparation step, the low-speed stirring speed of the mixing mixer is 200-400 rpm; the stirring time is 5-10 min; after the photosensitive functional solution is added, the speed of the mixing mixer is increased to 600-1000 rpm.

8. The method for preparing photosensitive concrete according to claim 5, characterized in that: In the S3 molding and curing step, the ambient temperature during the initial curing is 40~50°C; the ambient humidity is 80~90%; and the initial curing time is 20~25h.

9. The method for preparing photosensitive concrete according to claim 4, characterized in that: In the S3 molding and curing step, the ambient temperature during the secondary curing is 20~30°C; the ambient humidity is 60~70%; and the secondary curing time is 25~30d.

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