Construction solid waste recycled concrete and processing technology thereof

Abstract

The present application relates to the field of concrete technology, and discloses a construction solid waste recycled concrete and its processing technology. The raw materials of the construction solid waste recycled concrete include silicate cement, recycled aggregate, trimethylsiloxysilicate and calcium hydroxybenzenesulfonate. Recycling the recycled aggregate to prepare recycled concrete promotes the recycling of construction solid waste. Trimethylsiloxysilicate can react with calcium hydroxide generated by the hydration of silicate cement to generate trimethylsiloxy calcium silicate, which forms a spatial network structure with calcium hydroxybenzenesulfonate. This structure has a strong binding force to silicate cement and can fill the pores of concrete, thereby improving the bonding force of silicate cement to recycled aggregate, making the concrete dense after solidification, and forming a relatively dense package for the recycled aggregate. The obtained concrete has high compressive strength, strong crack resistance, and good impermeability.

Description

Technical Field

[0001] The present application relates to the field of concrete technology, and more specifically, to a construction solid waste recycled concrete and a processing technology thereof. Background Art

[0002] In the past, construction solid waste was primarily dumped and landfilled. In recent years, the construction solid waste utilization industry has emerged, with applications such as recycled concrete and mortar in construction projects and recycled permeable bricks in municipal projects, contributing to the circular development of the construction industry.

[0003] Recycled concrete refers to new concrete made by crushing, cleaning, and grading discarded concrete blocks, mixing them with grading in a certain proportion, partially or completely replacing natural aggregates such as sand and gravel (mainly coarse aggregates), and then adding cement, water, etc.

[0004] Since waste concrete is subjected to large external forces during the crushing process, a large number of fine cracks will appear inside the aggregate, making the water absorption rate and water absorption rate of the recycled aggregate much higher than that of natural aggregate. In addition, the recycled aggregate is prone to water loss, resulting in poor compressive strength and weak crack resistance of some related recycled concrete. Summary of the Invention

[0005] In view of the fact that some related construction solid waste recycled concretes have poor compressive strength and weak crack resistance, this application develops a construction solid waste recycled concrete with high compressive strength and strong crack resistance and its processing technology.

[0006] In the first aspect, the present application proposes a construction solid waste recycled concrete and adopts the following technical solution.

[0007] Disclosed is construction solid waste recycled concrete, wherein the raw materials of the construction solid waste recycled concrete include silicate cement, recycled aggregate, trimethylsiloxysilicate and calcium hydroxybenzenesulfonate.

[0008] By adopting the above technical solution, trimethylsiloxysilicate reacts with calcium hydroxide generated by the hydration of Portland cement to form trimethylsiloxy calcium silicate. This product has a calcium silicate-based structure at one end, which provides good adhesion to Portland cement molecules. The trimethylsilyl group at the other end has a three-dimensional structure that fills the pores in concrete. Calcium hydroxybenzenesulfonate, with two hydroxyl groups and a sulfonic acid group on the benzene ring, is hydrophilic and can adsorb hydrated Portland cement particles, forming a spatial network structure. Since calcium hydroxybenzenesulfonate and trimethylsiloxysilicate are uniformly dispersed in concrete during the concrete mixing process, and since the sulfonic acid group of calcium hydroxybenzenesulfonate and the calcium silicate group of the above-mentioned product both have electron pair donors and electron acceptors, they have a complexing effect, so that calcium hydroxybenzenesulfonate and trimethylsiloxy calcium silicate form a spatial cross-linked structure. This structure has a strong binding force to silicate cement, can fill the pores in concrete, and enhance the bonding force of silicate cement to recycled aggregates, making the concrete dense after setting, forming a relatively dense package for the recycled aggregates, making the recycled aggregates less likely to lose water or absorb water, and the resulting concrete has high compressive strength, strong crack resistance, and good impermeability. On the other hand, calcium hydroxybenzenesulfonate also has a retarding effect because it has two hydroxyl groups and a sulfonic acid group on the benzene ring, both of which are hydrophilic and can adsorb silicate cement particles and water molecules, so that the mutual contact between silicate cement molecules and water molecules is shielded, hindering the hydration process of silicate cement molecules, extending the setting time of silicate cement, reducing the shrinkage rate of concrete, and improving the crack resistance of concrete.

[0009] As an improvement to the construction solid waste recycled concrete, the recycled aggregate is obtained by recycling waste concrete, crushing the waste concrete to obtain aggregate particles and mortar particles, then screening to remove the mortar particles to obtain the aggregate particles, placing the aggregate particles into a mixer for stirring, so that the aggregate particles repeatedly fall from a high place and collide with each other, so that the mortar on the surface of the aggregate particles is completely or partially removed, and finally the recycled aggregate is obtained.

[0010] By adopting the above technical solution, waste concrete is recycled and the resulting recycled aggregate can be gravel. The recycled aggregate can be screened to obtain particles with a particle size of 10 to 40 mm. Aggregate particles can be dropped from a height and collided with each other using equipment such as a concrete mixer to remove mortar adhering to the surface of the aggregate particles, thereby increasing their compressive strength, reducing water absorption, and improving their fluidity in the recycled concrete, reducing the difficulty of construction.

[0011] It should be noted that the aggregate described in this application is coarse aggregate with a diameter greater than 5 mm, such as crushed stone, riprap, etc.

[0012] As an improvement to the construction solid waste recycled concrete, the mass ratio of the silicate cement, the recycled aggregate, the trimethylsiloxysilicate and the calcium hydroxybenzenesulfonate is 100:(200-300):(0.5-5):(1-8).

[0013] By adopting the above technical solution, calcium hydroxybenzenesulfonate and calcium trimethylsiloxysilicate form a spatial cross-linked structure, uniformly filling the pores of the concrete, making the concrete dense after solidification, forming a relatively dense wrapping for the recycled aggregate, making the recycled aggregate less likely to lose water or absorb water, and the resulting concrete has high compressive strength, strong crack resistance, and good impermeability.

[0014] As an improvement to the construction solid waste recycled concrete, the mass ratio of the silicate cement, the recycled aggregate, the trimethylsiloxysilicate and the calcium hydroxybenzenesulfonate is 100:(200-300):(2-3):(4-5).

[0015] By adopting the above technical solution, the compressive strength, crack resistance and impermeability of the obtained concrete reach optimal values.

[0016] As an improvement of the construction solid waste recycled concrete, the construction solid waste recycled concrete also includes perfluorooctylethyl trisiloxane.

[0017] By adopting the above technical solution, perfluorooctylethyl trisiloxane has a perfluorosiloxane chain with a water-repellent effect. When mixed in concrete, it can be interspersed in the spatial cross-linked structure formed by calcium hydroxybenzenesulfonate and trimethylsiloxy calcium silicate, further improving the concrete's impermeability, increasing the concrete's service life in water, and better protecting the steel bars in the concrete.

[0018] As an improvement of the construction solid waste recycled concrete, the mass ratio of the silicate cement to the perfluorooctylethyl trisiloxane is 100:(0.5-2).

[0019] By adopting the above technical solution, perfluorooctylethyl trisiloxane can be evenly interspersed in the spatial cross-linked structure formed by calcium hydroxybenzenesulfonate and trimethylsiloxy calcium silicate, and the concrete has stronger impermeability.

[0020] As an improvement of the construction solid waste recycled concrete, the construction solid waste recycled concrete also includes carboxyl polyethylene glycol acrylamide.

[0021] By adopting the above technical solution, carboxyl polyethylene glycol acrylamide has a longer molecular chain, which contains hydrophilic groups such as carboxyl, hydroxyl, and amide. It can adsorb the hydroxyl groups of calcium hydroxybenzenesulfonate and also has a strong water absorption effect, forming a water retention effect, so that the concrete has strong water retention, slow water loss during initial curing, and basically no need for watering for moisturizing, which improves the convenience of curing, and the prepared concrete has strong crack resistance.

[0022] As an improvement of the construction solid waste recycled concrete, the mass ratio of the silicate cement to the carboxyl polyethylene glycol acrylamide is 100:(3-5).

[0023] By adopting the above technical solution, the concrete has strong water retention and strong crack resistance. If the carboxy polyethylene glycol acrylamide accounts for too much, the concrete setting time will be too long, which is not conducive to construction. If the carboxy polyethylene glycol acrylamide accounts for too little, the concrete water retention is not strong enough, and curing may require additional measures such as sprinkling and humidification, which is inconvenient.

[0024] As an improvement to the construction solid waste recycled concrete, the construction solid waste recycled concrete also includes fly ash, the fly ash has a particle size of 100 to 200 μm, a porosity of 60 to 70%, and a mass ratio of the Portland cement to the fly ash of 100:(5 to 10).

[0025] By adopting the above technical solution, fly ash with a specific particle size and porosity has low water absorption, which helps improve the fluidity of concrete and reduces the heat released by the hydration of Portland cement, thereby reducing the occurrence of cracks. Fly ash is the fine ash captured from the flue gas after coal combustion. Its components include SiO2, Al2O3, FeO, Fe2O3, CaO, TiO2, etc.

[0026] On the second aspect, the present application also proposes a processing technology for recycled concrete from construction solid waste as described above, and adopts the following technical solution.

[0027] A processing process for the construction solid waste recycled concrete as described above comprises mixing the silicate cement, the recycled aggregate, the trimethylsiloxysilicate and the calcium hydroxybenzenesulfonate, adding sand and water and stirring evenly to obtain the construction solid waste recycled concrete.

[0028] By adopting the above technical solution, recycled aggregates can be reused, and the prepared recycled concrete improves the poor compressive strength and weak crack resistance of construction solid waste recycled concrete, and obtains a dense, high compressive strength, strong crack resistance and good impermeability recycled concrete.

[0029] In summary, the construction solid waste recycled concrete and its processing technology of the present application have the following beneficial effects:

[0030] Reuse recycled aggregates to prepare recycled concrete and promote the recycling of construction solid waste.

[0031] By recycling waste concrete, crushing the waste concrete, screening aggregate particles, placing the aggregate particles in equipment such as concrete mixers, and making the aggregate particles fall from a high place and collide with each other, the mortar adhering to the surface of the aggregate particles is removed, thereby increasing their compressive strength, reducing water absorption, and improving their fluidity in recycled concrete, reducing the difficulty of construction.

[0032] Through the modification effect of trimethylsiloxysilicate and calcium hydroxybenzenesulfonate, the prepared concrete improves the water absorption rate and water absorption rate of the recycled aggregate, which leads to the poor compressive strength and weak crack resistance of the recycled concrete. The obtained concrete forms a relatively dense wrapping of the recycled aggregate, making it difficult for the recycled aggregate to lose water or absorb water. The obtained concrete has high compressive strength, strong crack resistance, and good impermeability. DETAILED DESCRIPTION

[0033] The following describes some embodiments of construction solid waste recycled concrete and its processing technology.

[0034] Example 1

[0035] Recycling waste concrete generated by house demolition and / or road construction. The waste concrete is crushed with a jaw crusher to obtain aggregate particles and mortar particles. The fine mortar particles are then screened to remove the aggregate particles. The aggregate particles are placed in a concrete mixer and stirred, causing the aggregate particles to repeatedly fall from a high altitude and collide with each other to remove the mortar attached to the surface of the aggregate particles. Aggregates with a particle size of 10 to 40 mm are then screened to obtain recycled aggregate.

[0036] 100 parts by mass of Portland cement, 260 parts by mass of recycled aggregate, 2.5 parts by mass of trimethylsiloxysilicate and 4.5 parts by mass of calcium hydroxybenzenesulfonate are mixed to obtain a construction solid waste recycled concrete.

[0037] The recycled aggregates used in the following examples and comparative examples were all obtained in the same manner as in Example 1.

[0038] Example 2

[0039] Sand and water were added to the construction solid waste recycled concrete prepared in Example 1 and stirred evenly to obtain a finished product of construction solid waste recycled concrete. Specifically, the construction solid waste recycled concrete prepared in Example 2 had a mix ratio of 100 parts Portland cement, 260 parts recycled aggregate, 2.5 parts trimethylsiloxysilicate, 4.5 parts calcium hydroxybenzenesulfonate, 120 parts sand, and 40 parts water.

[0040] At a temperature of 20-35° C. and a relative humidity of 55-75%, the initial setting time of the recycled concrete of Example 2 was measured using a concrete setting time meter to be 2.5 hours, while the final setting time was 5 hours. Compared with ordinary concrete, it has a longer initial setting time and a shorter final setting time, making it more convenient for construction.

[0041] Example 3

[0042] By mass, 100 parts of Portland cement, 260 parts of recycled aggregate, 2 parts of trimethylsiloxysilicate and 5 parts of calcium hydroxybenzenesulfonate were mixed, and 120 parts of sand and 40 parts of water were added and stirred evenly to obtain a construction solid waste recycled concrete.

[0043] Example 4

[0044] By mass, 100 parts of Portland cement, 260 parts of recycled aggregate, 3 parts of trimethylsiloxysilicate and 4 parts of calcium hydroxybenzenesulfonate were mixed, and 120 parts of sand and 40 parts of water were added and stirred evenly to obtain a construction solid waste recycled concrete.

[0045] Example 5

[0046] By mass, 100 parts of Portland cement, 260 parts of recycled aggregate, 0.5 parts of trimethylsiloxysilicate and 1 part of calcium hydroxybenzenesulfonate were mixed, and 120 parts of sand and 40 parts of water were added and stirred evenly to obtain a construction solid waste recycled concrete.

[0047] Example 6

[0048] By mass, 100 parts of Portland cement, 260 parts of recycled aggregate, 5 parts of trimethylsiloxysilicate and 8 parts of calcium hydroxybenzenesulfonate were mixed, and 120 parts of sand and 40 parts of water were added and stirred evenly to obtain a construction solid waste recycled concrete.

[0049] Example 7

[0050] Compared with Example 2, the raw materials of the recycled concrete in this embodiment further include perfluorooctylethyl trisiloxane, as shown below.

[0051] By mass, 100 parts of Portland cement, 260 parts of recycled aggregate, 2.5 parts of trimethylsiloxysilicate, 4.5 parts of calcium hydroxybenzenesulfonate and 0.5 part of perfluorooctylethyl trisiloxane were mixed, and 120 parts of sand and 40 parts of water were added and stirred evenly to obtain a construction solid waste recycled concrete.

[0052] Example 8

[0053] Compared with Example 7, the amount of perfluorooctylethyl trisiloxane added in this example is different, as shown below.

[0054] By mass, 100 parts of Portland cement, 260 parts of recycled aggregate, 2.5 parts of trimethylsiloxysilicate, 4.5 parts of calcium hydroxybenzenesulfonate and 2 parts of perfluorooctylethyl trisiloxane were mixed, and 120 parts of sand and 40 parts of water were added and stirred evenly to obtain a construction solid waste recycled concrete.

[0055] Example 9

[0056] Compared with Example 2, the raw materials of the recycled concrete in this embodiment further include carboxyl polyethylene glycol acrylamide, as follows.

[0057] By mass, 100 parts of Portland cement, 260 parts of recycled aggregate, 2.5 parts of trimethylsiloxysilicate, 4.5 parts of calcium hydroxybenzenesulfonate and 3 parts of carboxyl polyethylene glycol acrylamide are mixed, and 120 parts of sand and 40 parts of water are added and stirred evenly to obtain a construction solid waste recycled concrete.

[0058] Example 10

[0059] Compared with Example 9, the amount of carboxyl polyethylene glycol acrylamide added in this example is different, as follows.

[0060] By mass, 100 parts of Portland cement, 260 parts of recycled aggregate, 2.5 parts of trimethylsiloxysilicate, 4.5 parts of calcium hydroxybenzenesulfonate and 5 parts of carboxyl polyethylene glycol acrylamide are mixed, and 120 parts of sand and 40 parts of water are added and stirred evenly to obtain a construction solid waste recycled concrete.

[0061] Example 11

[0062] Compared with Example 2, the raw materials of the recycled concrete in this embodiment further include fly ash, as described below.

[0063] A construction solid waste recycled concrete was obtained by mixing 100 parts by weight of Portland cement, 260 parts by weight of recycled aggregate, 2.5 parts by weight of trimethylsiloxysilicate, 4.5 parts by weight of calcium hydroxybenzenesulfonate, and 5 parts by weight of fly ash. 120 parts by weight of sand and 40 parts by weight of water were then added and stirred uniformly to obtain the resultant mixture. The fly ash had a particle size of 100 to 200 μm and a porosity of 63%.

[0064] Example 12

[0065] Compared with Example 9, the amount of fly ash added in this example is different, as follows.

[0066] A construction solid waste recycled concrete was obtained by mixing 100 parts by weight of Portland cement, 260 parts by weight of recycled aggregate, 2.5 parts by weight of trimethylsiloxysilicate, 4.5 parts by weight of calcium hydroxybenzenesulfonate, and 10 parts by weight of fly ash. 120 parts by weight of sand and 40 parts by weight of water were then added and stirred uniformly to obtain the fly ash. The fly ash had a particle size of 100 to 200 μm and a porosity of 63%.

[0067] Example 13

[0068] Compared with Example 2, the raw materials of the recycled concrete in this embodiment further include perfluorooctylethyl trisiloxane, carboxyl polyethylene glycol acrylamide and fly ash, as shown in the following details.

[0069] A construction solid waste recycled concrete was prepared by mixing 100 parts by weight of Portland cement, 260 parts by weight of recycled aggregate, 2.5 parts by weight of trimethylsiloxysilicate, 4.5 parts by weight of calcium hydroxybenzenesulfonate, 1.25 parts by weight of perfluorooctylethyl trisiloxane, 4 parts by weight of carboxypolyethylene glycol acrylamide, and 7.5 parts by weight of fly ash. The mixture was then mixed with 120 parts by weight of sand and 40 parts by weight of water, and stirred uniformly to obtain the resultant mixture. The fly ash had a particle size of 100 to 200 μm and a porosity of 63%.

[0070] Comparative Example 1

[0071] Compared with Example 2, the raw materials of the recycled concrete in this comparative example do not include trimethylsiloxysilicate, and the original addition amount of trimethylsiloxysilicate is completely converted into the addition amount of calcium hydroxybenzenesulfonate, as shown below.

[0072] By mass, 100 parts of Portland cement, 260 parts of recycled aggregate and 7 parts of calcium hydroxybenzenesulfonate were mixed, and 120 parts of sand and 40 parts of water were added and stirred evenly to obtain a construction solid waste recycled concrete.

[0073] Comparative Example 2

[0074] Compared with Example 2, the raw materials of the recycled concrete in this comparative example do not include calcium hydroxybenzenesulfonate, and the original addition amount of calcium hydroxybenzenesulfonate is completely converted into the addition amount of trimethylsiloxysilicate, as shown below.

[0075] By mass, 100 parts of Portland cement, 260 parts of recycled aggregate and 7 parts of trimethylsiloxysilicate were mixed, and 120 parts of sand and 40 parts of water were added and stirred evenly to obtain a construction solid waste recycled concrete.

[0076] Comparative Example 3

[0077] Compared with Example 2, the raw materials of the recycled concrete in this comparative example do not include trimethylsiloxysilicate and calcium hydroxybenzenesulfonate.

[0078] By mass, 100 parts of Portland cement and 260 parts of recycled aggregate are mixed, and 120 parts of sand and 40 parts of

[0079] The water is stirred evenly to obtain a construction solid waste recycled concrete.

[0080] Comparative Example 4

[0081] Compared with Example 2, this comparative example uses first-use common aggregate instead of recycled aggregate. The common aggregate is crushed stone with a particle size of 10 to 40 mm. The specific scheme is as follows.

[0082] 100 parts by mass of Portland cement, 260 parts by mass of ordinary aggregate, 2.5 parts by mass of trimethylsiloxysilicate and 4.5 parts by mass of calcium hydroxybenzenesulfonate were mixed, and 120 parts by mass of sand and 40 parts by mass of water were added and stirred uniformly to obtain a concrete.

[0083] Test Example 1

[0084] The compressive strength, impermeability grade, and crack resistance of the concrete prepared in Examples 2 to 13 and Comparative Examples 1 to 4 were tested 28 days after molding. The test standards and results are as follows.

[0085] Compressive strength: Determined according to the compressive strength test in GB / T 50081-2019 "Standard for Test Methods for Physical and Mechanical Properties of Concrete".

[0086] Water penetration resistance: The water penetration resistance grade is determined according to the step-by-step pressure method in the "Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete" (GB / T 50082-2009). The unsteady-state chloride ion migration coefficient (DRCM) of the concrete is measured according to the "Rapid Chloride Ion Migration Coefficient Method" in the "Chloride Ion Penetration Resistance Test" (GB / T 50082-2009). The chloride ion penetration resistance grade is assessed based on the measured DRCM according to the "Concrete Durability Test and Assessment Standard JGJ / T193-2009."

[0087] Crack resistance: According to the early crack resistance test in GB / T 50082-2009 "Standard for Test Methods for Long-term Properties and Durability of Ordinary Concrete", the number of cracks per unit area of ​​concrete and the total cracked area per unit area are calculated.

[0088] The test results of the above test items are shown in Table 1 below.

[0089] Table 1 Performance test of concrete prepared in Examples 2 to 13 and Comparative Examples 1 to 4

[0090]

[0091]

[0092] In Table 1, the water penetration resistance level > P12 means that when the sample is tested to level 13 (1.4 MPa water pressure), 4 or more of the 6 parts in each embodiment or comparative example still do not show water penetration, and the test is stopped.

[0093] As can be seen from Table 1, the concrete prepared in Examples 1-13 and Comparative Example 4 achieved comparable compressive strength, water penetration resistance, chloride ion penetration resistance, and crack resistance. Examples 1-13 used recycled aggregate, while Comparative Example 4 used virgin, ordinary aggregate. The addition of trimethylsiloxysilicate and calcium hydroxybenzenesulfonate to the concrete, through the solutions presented in the examples, substantially improved the effects of the recycled aggregate's water absorption rate and rate, which were significantly higher than those of natural aggregate. This approach offers broad application prospects.

[0094] Compared with Example 2, in Example 7-8, perfluorooctylethyl trisiloxane is added to the concrete raw materials, and its resistance to chloride ion penetration is improved. This is because perfluorooctylethyl trisiloxane can be evenly interspersed in the spatial cross-linked structure formed by calcium hydroxybenzenesulfonate and trimethylsiloxy calcium silicate, further improving the impact of the concrete's impermeability.

[0095] Compared with Example 2, the concrete raw materials of Examples 9-10 increase carboxyl polyethylene glycol acrylamide, and their crack resistance is improved. This is because carboxyl polyethylene glycol acrylamide has a longer molecular chain, which contains hydrophilic groups such as carboxyl, hydroxyl, and amide, which can adsorb the hydroxyl groups of calcium hydroxybenzenesulfonate and has a strong water absorption effect, making the concrete have strong water retention and slow water loss during initial curing. The prepared concrete has strong crack resistance.

[0096] In Example 13, compared with Example 2, perfluorooctylethyl trisiloxane, carboxyl polyethylene glycol acrylamide and fly ash are added to the concrete raw materials, and the compressive strength, resistance to chloride ion penetration and crack resistance of the concrete are slightly improved.

[0097] Compared with Example 2, the concrete raw materials of Comparative Example 1 lack trimethylsiloxysilicate, and its compressive strength, water penetration resistance grade, chloride ion penetration resistance grade, crack resistance, etc. are significantly reduced. This is because trimethylsiloxysilicate can react with calcium hydroxide generated by hydration of silicate cement to form trimethylsiloxy calcium silicate. One end of the product is a calcium silicate-based structure, which has good adhesion to the silicate cement molecules, and the other end is a trimethylsilyl-based spatial structure that has the function of filling the pores of the concrete. The concrete prepared in Comparative Example 1 lacks these effects, resulting in performance degradation.

[0098] Compared with Example 2, the concrete raw materials of Comparative Example 2 lack calcium hydroxybenzenesulfonate, which cannot form a spatial cross-linked structure with the product calcium trimethylsiloxysilicate, resulting in weak adhesion of silicate cement to recycled aggregate, thereby reducing the compressive strength, water penetration resistance, chloride ion penetration resistance and crack resistance of the concrete.

[0099] Compared with Example 2, in Comparative Example 3, the concrete raw materials lack trimethylsiloxysilicate and calcium hydroxybenzenesulfonate, and the prepared concrete has poor compressive strength, water penetration resistance, chloride ion penetration resistance and crack resistance.

[0100] Based on the results of the above embodiments, comparative examples, and test examples, the construction solid waste recycled concrete and its processing method of the present invention reuse recycled aggregate to produce recycled concrete, promoting the recycling of construction solid waste. By recycling and crushing waste concrete, screening aggregate particles, removing mortar adhering to the surface of the aggregate particles, and modifying the concrete with trimethylsiloxysilicate and calcium hydroxybenzenesulfonate, the resulting concrete improves the effects of the high water absorption rate and water absorption rate of the recycled aggregate. The resulting concrete forms a relatively dense coating around the recycled aggregate, making it less susceptible to water loss or water absorption. The resulting concrete exhibits high compressive strength, strong crack resistance, and good impermeability.

[0101] The above description is merely a preferred embodiment of the present application. The scope of protection of the present application is not limited to the above embodiment. All technical solutions based on the concept of the present application are within the scope of protection of the present application. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present application should also be considered to fall within the scope of protection of the present application.

Claims

1. A construction solid waste recycled concrete, characterized in that: The raw materials of the construction solid waste recycled concrete include silicate cement, recycled aggregate, trimethylsiloxysilicate and calcium hydroxybenzenesulfonate; The mass ratio of the silicate cement, the recycled aggregate, the trimethylsiloxysilicate and the calcium hydroxybenzenesulfonate is 100: (200-300): (0.5-5): (1-8).

2. The construction solid waste recycled concrete according to claim 1, characterized in that: The recycled aggregate is obtained by recycling waste concrete, crushing the waste concrete to obtain aggregate particles and mortar particles, then screening to remove the mortar particles to obtain the aggregate particles, placing the aggregate particles in a mixer for stirring, causing the aggregate particles to repeatedly fall from a high place and collide with each other, thereby completely or partially removing the mortar on the surface of the aggregate particles, and finally obtaining the recycled aggregate.

3. The construction solid waste recycled concrete according to claim 1, characterized in that: The mass ratio of the silicate cement, the recycled aggregate, the trimethylsiloxysilicate and the calcium hydroxybenzenesulfonate is 100: (200-300): (2-3): (4-5).

4. The construction solid waste recycled concrete according to claim 1, characterized in that: The construction solid waste recycled concrete also includes perfluorooctylethyl trisiloxane.

5. The construction solid waste recycled concrete according to claim 4, characterized in that: The mass ratio of the silicate cement to the perfluorooctylethyl trisiloxane is 100:(0.5~2).

6. The construction solid waste recycled concrete according to claim 1, characterized in that: The construction solid waste recycled concrete also includes carboxyl polyethylene glycol acrylamide.

7. The construction solid waste recycled concrete according to claim 6, characterized in that: The mass ratio of the silicate cement to the carboxyl polyethylene glycol acrylamide is 100:(3-5).

8. The construction solid waste recycled concrete according to claim 1, characterized in that: The construction solid waste recycled concrete also includes fly ash, the particle size of the fly ash is 100-200 μm, and the porosity of the fly ash is 60-70%; the mass ratio of the silicate cement to the fly ash is 100:(5-10).

9. A process for processing construction solid waste recycled concrete according to any one of claims 1 to 8, characterized in that: The processing technology includes: The silicate cement, the recycled aggregate, the trimethylsiloxysilicate and the calcium hydroxybenzenesulfonate are mixed, and sand and water are added and stirred evenly to obtain the construction solid waste recycled concrete.

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