Building material based on recycling of waste concrete

Abstract

The invention discloses a building material based on recycling of waste concrete, which is prepared from the following raw materials in parts by weight: 60 to 75 parts of waste concrete aggregate, 80 to 98 parts of cement, 85 to 108 parts of quartz sand, 96 to 145 parts of fly ash, 0.9 to 4.5 parts of polypropylene fiber, 0.4 to 5.5 parts of carbon fiber and 1 to 1.5 parts of polyacrylamide anionic surfactant. 12 to 25 parts of epoxy resin, 9 to 15 parts of modified phenolic resin glue, 1.5 to 2.4 parts of a compound additive and water; wherein the compound additive is prepared by mixing a naphthalene water reducer and sodium gluconate, and the modified phenolic resin glue is epoxy modified phenolic resin glue. According to the building material provided by the invention, the polypropylene fiber and the polyacrylamide anionic surfactant can form a certain cross-linking system in a building material system through a bridging effect, so that the internal density of the building material is improved, and the compressive property of the product is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and specifically to a building material based on the recycling and reuse of waste concrete. Background Art

[0002] The rapid development of the construction industry has led to a substantial annual increase in construction waste generated during the demolition and construction of construction projects; the increase in the discharge of waste concrete is likely to cause serious environmental problems and secondary environmental pollution; therefore, we should accelerate the research on the recycling and reuse of these large quantities of solid waste concrete in buildings.

[0003] The building materials made of waste concrete in the prior art generally still have problems such as low strength, high water absorption, small density, rough surface, many cracks, uneven properties between particles, and are prone to problems such as small slump, poor fluidity, and low compressive strength.

[0004] The defects of the existing building materials are:

[0005] 1. Patent document CN112456880A proposes a concrete processing technology doped with waste concrete blocks and the recycled concrete prepared thereby. The concrete of this patent document has the advantage of improving the flexural performance of the product, but this patent document does not consider further ensuring the full hydration reaction inside the concrete system to improve the density and compressive strength of the product;

[0006] 2. Application document CN109437714A discloses a green renewable building material and its preparation method. The building material of this patent document achieves the purpose of recycling waste concrete and avoids environmental pollution, but does not consider improving the mechanical properties of the building material, and the prepared building material is prone to problems such as many cracks and low compressive strength;

[0007] 3. In most cases, the building materials made of waste recycled concrete in the prior art do not consider reducing the cracking phenomenon of concrete and improving the strength of the product by increasing the water reduction rate of the building material;

[0008] 4. The strength and density of the building materials made of waste concrete in the prior art need to be further improved, and the comprehensive performance needs to be further improved. Summary of the Invention

[0009] The purpose of the present invention is to provide a building material based on the recycling and reuse of waste concrete to solve the problems raised in the above background art.

[0010] To achieve the above object, the present invention provides the following technical solution: A building material based on the recycling and reuse of waste concrete, which is made of the following raw materials by weight: 60 parts to 75 parts of waste concrete aggregate, 80 parts to 98 parts of cement, 85 parts to 108 parts of quartz sand, 96 parts to 145 parts of fly ash, 0.9 parts to 4.5 parts of polypropylene fiber, 0.4 parts to 5.5 parts of carbon fiber, 1 part to 1.5 parts of polyacrylamide anionic surfactant, 12 parts to 25 parts of epoxy resin, 9 parts to 15 parts of modified phenolic resin glue, 1.5 parts to 2.4 parts of compound admixture, and water;

[0011] Among them, the compound admixture is prepared by mixing naphthalene-based water reducer and sodium gluconate, and the modified phenolic resin glue is epoxy-modified phenolic resin glue.

[0012] Preferably, in the compound admixture, the mass ratio of naphthalene-based water reducer to sodium gluconate is (40 - 45):(1 - 1.2).

[0013] Preferably, the waste concrete aggregate is obtained through a series of treatments including crushing, debarring, sorting, screening, washing, and drying of waste concrete.

[0014] Preferably, the particle size of the waste concrete aggregate is 15μm to 50μm.

[0015] Preferably, the cement is ordinary Portland cement, and the fly ash is ordinary micro fly ash.

[0016] Preferably, the fineness modulus of the quartz sand is 1.6 to 2.4; the particle size of the fly ash is 1000 mesh to 1200 mesh.

[0017] Preferably, the diameter of the epoxy resin is 10μm to 18μm.

[0018] Preferably, the length of the polypropylene fiber is 8mm to 15mm, and the diameter is 0.02mm to 0.05mm; the length of the carbon fiber is 10mm to 45mm, and the diameter is 0.02mm to 0.03mm.

[0019] Preferably, a preparation method of a building material based on the recycling and reuse of waste concrete includes the following steps:

[0020] Step S1: Weigh each raw material according to the weight parts;

[0021] Step S2: Mix the cement, quartz sand, fly ash, polypropylene fiber, carbon fiber, epoxy resin, and part of the water, and stir well;

[0022] Step S3: Add the waste concrete aggregate while stirring to make it evenly dispersed;

[0023] Step S4: Continuously add polyacrylamide anionic surfactant, modified phenolic resin adhesive, compound admixture and the remaining water, and stir evenly to obtain a mixture;

[0024] Step S5: Pour the mixture into a mold, vibrate it, and then cure it in a humid environment at 18°C - 26°C for 3 - 5 days to obtain the building material.

[0025] Preferably, in Step S2, the starting stirring speed is 550 revolutions per minute to 600 revolutions per minute, mix at 85°C for 8 min to 12 min, adjust to 1200 r / min, and mix at 90°C for 12 min to 18 min;

[0026] In Step S4, the stirring speed is 1400 revolutions per minute to 600 revolutions per minute, and stir and mix at 105°C for 25 min to 36 min.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. For the building material provided by the present invention, polypropylene fiber and polyacrylamide anionic surfactant can form a certain cross-linking system through bridging action in the building material system, thereby improving the density inside the building material, enhancing the compressive performance of the product, and the cross-linking system has good water retention performance and can carry a certain amount of water. After being added to the system, it can effectively ensure that the hydration reaction of the system is more sufficient, thereby further improving the density of the system, further enhancing the water resistance and compressive performance of the product. At the same time, the present invention uses waste concrete raw materials to replace ordinary natural materials in the prior art, which can effectively relieve the pressure of the shortage of natural aggregates and the environmental pollution problem caused by concrete waste, and is one of the effective measures to ensure the sustainable development of society.

[0029] 2. In the present invention, adding modified phenolic resin adhesive can improve the mechanical properties of the building material. The modified phenolic resin adhesive is formed by the ring-opening reaction of the hydroxymethyl in phenolic resin and the epoxy group in epoxy resin, and at the same time, the hydroxyl group in epoxy resin forms hydrogen bonds or dehydrates with the unreacted hydroxymethyl, thereby improving the adhesiveness, toughness, weather resistance and mechanical strength of the modified phenolic resin. At the same time, the modified phenolic resin adhesive also retains the inherent advantages of phenolic resin adhesive. By adding modified phenolic resin adhesive, it can promote the hydration reaction inside the cement and can also fill the tiny defects and gaps in the building concrete, thereby improving the strength, hardness, durability and crack resistance of the building material.

[0030] 3. The water reduction rate of the product is increased by adding a compound admixture in the present invention. The compound admixture is prepared by mixing naphthalene-based water reducer and sodium gluconate in a certain proportion. When the naphthalene-based water reducer and sodium gluconate act together, the water reduction rate is increased significantly. The increase in the water reduction rate can reduce the cracking phenomenon of concrete, improve the strength of the product, and improve the surface glossiness of the product. The increase in the water reduction rate can also reduce the cement consumption and save costs.

[0031] 4. The performance of the building material is greatly improved by adding carbon fiber and polyester fiber to the concrete in the present invention. The carbon fiber and polyester fiber can form a network structure with the cement stone particles in the concrete, so as to improve the overall strength of the concrete, resist the internal stress and external stress generated by the concrete, and effectively reduce the cracking and fracture of the concrete. In addition, the addition of carbon fiber and polyester fiber can also improve the impact resistance, freeze-thaw resistance, fire resistance, durability and anti-aging performance of the building material, reduce the shrinkage and expansion of the concrete, extend the service life of the concrete, improve the antioxidant, durability and water resistance of the concrete, and make the concrete more stable and reliable. Through the synergistic action of each component, the prepared building material has excellent comprehensive performance, high compressive strength, sufficient stability, good environmental protection performance, and has high economic value, social value and ecological value. Specific embodiments

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] A building material based on the recycled utilization of waste concrete provided by the present invention is made of the following raw materials by weight: 60 to 75 parts of waste concrete aggregate, 80 to 98 parts of cement, 85 to 108 parts of quartz sand, 96 to 145 parts of fly ash, 0.9 to 4.5 parts of polypropylene fiber, 0.4 to 5.5 parts of carbon fiber, 1 to 1.5 parts of polyacrylamide anionic surfactant, 12 to 25 parts of epoxy resin, 9 to 15 parts of modified phenolic resin adhesive, 1.5 to 2.4 parts of compound admixture and water;

[0034] Among them, the compound admixture is prepared by mixing naphthalene-based water reducer and sodium gluconate, and the modified phenolic resin adhesive is epoxy-modified phenolic resin adhesive.

[0035] In the compound admixture, the mass ratio of naphthalene-based water reducer to sodium gluconate is (40 - 45):(1 - 1.2).

[0036] The waste concrete aggregate is obtained through a series of treatments including crushing, reinforcement removal, sorting, screening, cleaning and drying of the waste concrete.

[0037] The particle size of waste concrete aggregate is 15μm to 50μm.

[0038] The cement is ordinary Portland cement, and the fly ash is ordinary micro fly ash.

[0039] The fineness modulus of quartz sand is 1.6 to 2.4; the particle size of fly ash is 1000 mesh to 1200 mesh.

[0040] The diameter of the epoxy resin is 10 μm to 18 μm.

[0041] The length of the polypropylene fiber is 8mm to 15mm, and the diameter is 0.02mm to 0.05mm; the length of the carbon fiber is 10mm to 45mm, and the diameter is 0.02mm to 0.03mm.

[0042] The present invention provides a method for preparing a building material based on recycling and utilizing waste concrete, comprising the following steps:

[0043] Step S1: weighing each raw material according to weight;

[0044] Step S2: Mix cement, quartz sand, fly ash, polypropylene fiber, carbon fiber, epoxy resin and part of water, and stir them thoroughly;

[0045] Step S3: adding waste concrete aggregate while stirring to make it evenly dispersed;

[0046] Step S4: continue to add polyacrylamide anionic surfactant, modified phenolic resin glue, compound admixture and remaining water, and stir evenly to obtain a mixture;

[0047] Step S5, pouring the mixture into a mold, vibrating, and then curing in a humid environment at 18° C.-26° C. for 3-5 days to obtain the building material.

[0048] Wherein, in step S2, the stirring speed is started at 550 rpm to 600 rpm, mixed at 85°C for 8min to 12min, adjusted to 1200 rpm, and mixed at 90°C for 12min to 18min;

[0049] In step S4, the stirring speed is 1400 rpm to 600 rpm, and the stirring and mixing is carried out at 105° C. for 25 min to 36 min.

[0050] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0051] Embodiment 1:

[0052] The present embodiment provides a building material based on the recycling of waste concrete, which is made of the following raw materials in parts by weight: 66 parts of waste concrete aggregate, 90 parts of cement, 100 parts of quartz sand, 125 parts of fly ash, 3 parts of polypropylene fiber, 2.8 parts of carbon fiber, 1.3 parts of polyacrylamide anionic surfactant, 22 parts of epoxy resin, 11 parts of modified phenolic resin glue, 2 parts of compound admixture and water;

[0053] The compound admixture is prepared by mixing naphthalene-based water reducer and sodium gluconate, and the modified phenolic resin adhesive is epoxy-modified phenolic resin adhesive.

[0054] In the compound admixture, the mass ratio of naphthalene-based water reducer and sodium gluconate is 40:1.

[0055] The waste concrete aggregate is obtained through a series of treatments including crushing, reinforcement removal, sorting, screening, cleaning and drying of the waste concrete.

[0056] The particle size of waste concrete aggregate is 15μm to 50μm.

[0057] The cement is ordinary Portland cement, and the fly ash is ordinary micro fly ash.

[0058] The fineness modulus of quartz sand is 1.6 to 2.4; the particle size of fly ash is 1000 mesh to 1200 mesh.

[0059] The diameter of the epoxy resin is 10 μm to 18 μm.

[0060] The length of the polypropylene fiber is 8mm to 15mm, and the diameter is 0.02mm to 0.05mm; the length of the carbon fiber is 10mm to 45mm, and the diameter is 0.02mm to 0.03mm.

[0061] An embodiment of the present invention provides a method for preparing a building material based on recycling and utilizing waste concrete, comprising the following steps:

[0062] Step S1: weighing each raw material according to weight;

[0063] Step S2: Mix cement, quartz sand, fly ash, polypropylene fiber, carbon fiber, epoxy resin and part of water, and stir them thoroughly;

[0064] Step S3: adding waste concrete aggregate while stirring to make it evenly dispersed;

[0065] Step S4: continue to add polyacrylamide anionic surfactant, modified phenolic resin glue, compound admixture and remaining water, and stir evenly to obtain a mixture;

[0066] Step S5: Pour the mixture into a mold, vibrate it, and then cure it in a humid environment at 18°C - 26°C for 3 - 5 days to obtain the building material.

[0067] Among them, in step S2, the starting stirring speed is 550 revolutions per minute to 600 revolutions per minute, mix at 85°C for 8 min to 12 min, adjust to 1200 r / min, and mix at 90°C for 12 min to 18 min;

[0068] In step S4, the stirring speed is 1400 revolutions per minute to 600 revolutions per minute, and stir and mix at 105°C for 25 min to 36 min.

[0069] Example Two:

[0070] A building material based on the recycling of waste concrete provided in this example is made from the following raw materials by weight: 66 parts of waste concrete aggregate, 90 parts of cement, 100 parts of quartz sand, 125 parts of fly ash, 1 part of polypropylene fiber, 2.8 parts of carbon fiber, 1.3 parts of polyacrylamide anionic surfactant, 22 parts of epoxy resin, 11 parts of modified phenolic resin glue, 2 parts of compound admixture, and water;

[0071] Among them, the compound admixture is prepared by mixing naphthalene-based water reducer and sodium gluconate, and the modified phenolic resin glue is epoxy-modified phenolic resin glue.

[0072] In the compound admixture, the mass ratio of naphthalene-based water reducer to sodium gluconate is 40:1.

[0073] The waste concrete aggregate is obtained through a series of treatments including crushing, debarring, sorting, screening, cleaning, and drying of waste concrete.

[0074] The particle size of the waste concrete aggregate is 15μm - 50μm.

[0075] The cement is ordinary Portland cement, and the fly ash is ordinary micro fly ash.

[0076] The fineness modulus of the quartz sand is 1.6 - 2.4; the particle size of the fly ash is 1000 mesh - 1200 mesh.

[0077] The diameter of the epoxy resin is 10μm - 18μm.

[0078] The length of the polypropylene fiber is 8mm - 15mm, and the diameter is 0.02mm - 0.05mm; the length of the carbon fiber is 10mm - 45mm, and the diameter is 0.02mm - 0.03mm.

[0079] A preparation method of a building material based on the recycling of waste concrete provided by an embodiment of the present invention includes the following steps:

[0080] Step S1: Weigh each raw material according to parts by weight;

[0081] Step S2: Mix cement, quartz sand, fly ash, polypropylene fiber, carbon fiber, epoxy resin and part of the water, and stir thoroughly;

[0082] Step S3: Add waste concrete aggregate while stirring to make it evenly dispersed;

[0083] Step S4: Continue to add polyacrylamide anionic surfactant, modified phenolic resin glue, compound admixture and the remaining water, and stir evenly to obtain a mixture;

[0084] Step S5: Pour the mixture into a mold, vibrate, and then cure in a humid environment at 18°C - 26°C for 3 - 5 days to obtain building materials.

[0085] Among them, in Step S2, the starting stirring speed is 550 revolutions per minute to 600 revolutions per minute, mix at 85°C for 8 min to 12 min, adjust to 1200 r / min, and mix at 90°C for 12 min to 18 min;

[0086] In Step S4, the stirring speed is 1400 revolutions per minute to 600 revolutions per minute, and stir and mix at 105°C for 25 min to 36 min.

[0087] Example 3:

[0088] A building material based on the recycling of waste concrete provided in this example is made of the following raw materials according to parts by weight: 66 parts of waste concrete aggregate, 90 parts of cement, 100 parts of quartz sand, 125 parts of fly ash, 3 parts of polypropylene fiber, 0.4 part of carbon fiber, 1.3 parts of polyacrylamide anionic surfactant, 22 parts of epoxy resin, 11 parts of modified phenolic resin glue, 2 parts of compound admixture and water;

[0089] Among them, the compound admixture is prepared by mixing naphthalene-based water reducer and sodium gluconate, and the modified phenolic resin glue is epoxy-modified phenolic resin glue.

[0090] In the compound admixture, the mass ratio of naphthalene-based water reducer to sodium gluconate is 40:1.

[0091] The waste concrete aggregate is obtained through a series of treatments of crushing, debarring, sorting, screening, cleaning and drying of waste concrete.

[0092] The particle size of the waste concrete aggregate is 15μm to 50μm.

[0093] The cement is ordinary Portland cement, and the fly ash is ordinary micro fly ash.

[0094] The fineness modulus of quartz sand is 1.6 to 2.4; the particle size of fly ash is 1000 mesh to 1200 mesh.

[0095] The diameter of the epoxy resin is 10 μm to 18 μm.

[0096] The length of the polypropylene fiber is 8mm to 15mm, and the diameter is 0.02mm to 0.05mm; the length of the carbon fiber is 10mm to 45mm, and the diameter is 0.02mm to 0.03mm.

[0097] An embodiment of the present invention provides a method for preparing a building material based on recycling and utilizing waste concrete, comprising the following steps:

[0098] Step S1: weighing each raw material according to weight;

[0099] Step S2: Mix cement, quartz sand, fly ash, polypropylene fiber, carbon fiber, epoxy resin and part of water, and stir them thoroughly;

[0100] Step S3: adding waste concrete aggregate while stirring to make it evenly dispersed;

[0101] Step S4: continue to add polyacrylamide anionic surfactant, modified phenolic resin glue, compound admixture and remaining water, and stir evenly to obtain a mixture;

[0102] Step S5, pouring the mixture into a mold, vibrating, and then curing in a humid environment at 18° C.-26° C. for 3-5 days to obtain the building material.

[0103] Wherein, in step S2, the stirring speed is started at 550 rpm to 600 rpm, mixed at 85°C for 8min to 12min, adjusted to 1200 rpm, and mixed at 90°C for 12min to 18min;

[0104] In step S4, the stirring speed is 1400 rpm to 600 rpm, and the stirring and mixing is carried out at 105° C. for 25 min to 36 min.

[0105] Embodiment 4:

[0106] The present embodiment provides a building material based on the recycling of waste concrete, which is made of the following raw materials in parts by weight: 66 parts of waste concrete aggregate, 90 parts of cement, 100 parts of quartz sand, 125 parts of fly ash, 3 parts of polypropylene fiber, 2.8 parts of carbon fiber, 1 part of polyacrylamide anionic surfactant, 22 parts of epoxy resin, 11 parts of modified phenolic resin glue, 2 parts of compound admixture and water;

[0107] The compound admixture is prepared by mixing naphthalene-based water reducer and sodium gluconate, and the modified phenolic resin adhesive is epoxy-modified phenolic resin adhesive.

[0108] In the compound admixture, the mass ratio of naphthalene-based water reducer and sodium gluconate is 40:1.

[0109] The waste concrete aggregate is obtained through a series of treatments including crushing, reinforcement removal, sorting, screening, cleaning and drying of the waste concrete.

[0110] The particle size of waste concrete aggregate is 15μm to 50μm.

[0111] The cement is ordinary Portland cement, and the fly ash is ordinary micro fly ash.

[0112] The fineness modulus of quartz sand is 1.6 to 2.4; the particle size of fly ash is 1000 mesh to 1200 mesh.

[0113] The diameter of the epoxy resin is 10 μm to 18 μm.

[0114] The length of the polypropylene fiber is 8mm to 15mm, and the diameter is 0.02mm to 0.05mm; the length of the carbon fiber is 10mm to 45mm, and the diameter is 0.02mm to 0.03mm.

[0115] An embodiment of the present invention provides a method for preparing a building material based on recycling and utilizing waste concrete, comprising the following steps:

[0116] Step S1: weighing each raw material according to weight;

[0117] Step S2: Mix cement, quartz sand, fly ash, polypropylene fiber, carbon fiber, epoxy resin and part of water, and stir them thoroughly;

[0118] Step S3: adding waste concrete aggregate while stirring to make it evenly dispersed;

[0119] Step S4: continue to add polyacrylamide anionic surfactant, modified phenolic resin glue, compound admixture and remaining water, and stir evenly to obtain a mixture;

[0120] Step S5, pouring the mixture into a mold, vibrating, and then curing in a humid environment at 18° C.-26° C. for 3-5 days to obtain the building material.

[0121] Wherein, in step S2, the stirring speed is started at 550 rpm to 600 rpm, mixed at 85°C for 8min to 12min, adjusted to 1200 rpm, and mixed at 90°C for 12min to 18min;

[0122] In step S4, the stirring speed is 1,400 revolutions per minute to 600 revolutions per minute, and the mixture is stirred and mixed for 25 min to 36 min under the condition of 105 °C.

[0123] Example 5:

[0124] A building material based on the recycled utilization of waste concrete provided in this example is made from the following raw materials by weight: 66 parts of waste concrete aggregate, 90 parts of cement, 100 parts of quartz sand, 125 parts of fly ash, 3 parts of polypropylene fiber, 2.8 parts of carbon fiber, 1.3 parts of polyacrylamide anionic surfactant, 22 parts of epoxy resin, 9 parts of modified phenolic resin glue, 2 parts of compound admixture, and water;

[0125] Among them, the compound admixture is prepared by mixing naphthalene-based water reducer and sodium gluconate, and the modified phenolic resin glue is epoxy-modified phenolic resin glue.

[0126] In the compound admixture, the mass ratio of naphthalene-based water reducer to sodium gluconate is 40:1.

[0127] The waste concrete aggregate is obtained through a series of treatments of crushing, removing steel bars, sorting, screening, washing, and drying of waste concrete.

[0128] The particle size of the waste concrete aggregate is 15 μm to 50 μm.

[0129] The cement is ordinary Portland cement, and the fly ash is ordinary micro fly ash.

[0130] The fineness modulus of the quartz sand is 1.6 to 2.4; the particle size of the fly ash is 1,000 mesh to 1,200 mesh.

[0131] The diameter of the epoxy resin is 10 μm to 18 μm.

[0132] The length of the polypropylene fiber is 8 mm to 15 mm, and the diameter is 0.02 mm to 0.05 mm; the length of the carbon fiber is 10 mm to 45 mm, and the diameter is 0.02 mm to 0.03 mm.

[0133] A preparation method of a building material based on the recycled utilization of waste concrete provided by an embodiment of the present invention includes the following steps:

[0134] Step S1: Weigh each raw material according to the weight parts;

[0135] Step S2: Mix the cement, quartz sand, fly ash, polypropylene fiber, carbon fiber, epoxy resin, and part of the water, and stir well;

[0136] Step S3: Add the waste concrete aggregate while stirring to make it evenly dispersed;

[0137] Step S4: Continuously add an anionic polyacrylamide surfactant, a modified phenolic resin adhesive, a compound admixture, and the remaining water, and stir evenly to obtain a mixture;

[0138] Step S5: Pour the mixture into a mold, vibrate it, and then cure it in a humid environment at 18°C - 26°C for 3 - 5 days to obtain the building material.

[0139] Among them, in step S2, the starting stirring speed is 550 revolutions per minute to 600 revolutions per minute, mix at 85°C for 8 min to 12 min, adjust to 1200 r / min, and mix at 90°C for 12 min to 18 min;

[0140] In step S4, the stirring speed is 1400 revolutions per minute to 600 revolutions per minute, and stir and mix at 105°C for 25 min to 36 min.

[0141] Comparative Example 1:

[0142] A building material based on the recycling of waste concrete provided in this comparative example,

[0143] This building material is made from the following raw materials by weight: 66 parts of waste concrete aggregate, 90 parts of cement, 100 parts of quartz sand, 125 parts of fly ash, 1.3 parts of an anionic polyacrylamide surfactant, 22 parts of epoxy resin, 11 parts of a modified phenolic resin adhesive, 2 parts of a compound admixture, and water;

[0144] Among them, the compound admixture is prepared by mixing a naphthalene-based water reducer and sodium gluconate, and the modified phenolic resin adhesive is an epoxy-modified phenolic resin adhesive.

[0145] In the compound admixture, the mass ratio of the naphthalene-based water reducer to sodium gluconate is 40:1.

[0146] The waste concrete aggregate is obtained through a series of treatments of crushing, removing steel bars, sorting, screening, cleaning, and drying of waste concrete.

[0147] The particle size of the waste concrete aggregate is 15 μm to 50 μm.

[0148] The cement is ordinary Portland cement, and the fly ash is ordinary micro fly ash.

[0149] The fineness modulus of the quartz sand is 1.6 - 2.4; the particle size of the fly ash is 1000 mesh - 1200 mesh.

[0150] The diameter of the epoxy resin is 10 μm - 18 μm.

[0151] A preparation method of a building material based on the recycling of waste concrete provided in the comparative example of the present invention includes the following steps:

[0152] Step S1: Weigh each raw material by weight parts;

[0153] Step S2: Mix cement, quartz sand, fly ash, epoxy resin and part of water, and stir thoroughly;

[0154] Step S3: Add waste concrete aggregate while stirring to make it evenly dispersed;

[0155] Step S4: Continue to add polyacrylamide anionic surfactant, modified phenolic resin glue, compound admixture and the remaining water, and stir evenly to obtain a mixture;

[0156] Step S5: Pour the mixture into a mold, vibrate, and then cure in a humid environment at 18°C - 26°C for 3 - 5 days to obtain building materials.

[0157] Among them, in Step S2, the starting stirring speed is 550 revolutions per minute to 600 revolutions per minute, mix at 85°C for 8 min to 12 min, adjust to 1200 r / min, and mix at 90°C for 12 min to 18 min;

[0158] In Step S4, the stirring speed is 1400 revolutions per minute to 600 revolutions per minute, and stir and mix at 105°C for 25 min to 36 min.

[0159] The difference between the content of this Comparative Example 1 and Comparative Example 1 is that: there is no polypropylene fiber and carbon fiber in the raw materials of this comparative example, and the rest are the same as those in Comparative Example 1.

[0160] Comparative Example Two:

[0161] A building material provided by this comparative example based on the recycled utilization of waste concrete,

[0162] This building material is made from the following raw materials by weight parts: 66 parts of waste concrete aggregate, 90 parts of cement, 100 parts of quartz sand, 125 parts of fly ash, 22 parts of epoxy resin, 11 parts of modified phenolic resin glue, 2 parts of compound admixture and water;

[0163] Among them, the compound admixture is prepared by mixing naphthalene-based water reducer and sodium gluconate, and the modified phenolic resin glue is epoxy-modified phenolic resin glue.

[0164] In the compound admixture, the mass ratio of naphthalene-based water reducer to sodium gluconate is 40:1.

[0165] The waste concrete aggregate is obtained through a series of treatments of crushing, removing steel bars, sorting, screening, cleaning and drying of waste concrete.

[0166] The particle size of the waste concrete aggregate is 15μm - 50μm.

[0167] The cement is ordinary Portland cement, and the fly ash is ordinary micro fly ash.

[0168] The fineness modulus of quartz sand is 1.6 to 2.4; the particle size of fly ash is 1000 mesh to 1200 mesh.

[0169] The diameter of the epoxy resin is 10 μm to 18 μm.

[0170] A method for preparing a building material based on recycling and utilizing waste concrete provided in the comparative example of the present invention comprises the following steps:

[0171] Step S1: weighing each raw material according to weight;

[0172] Step S2: Mix cement, quartz sand, fly ash, epoxy resin and part of water, and stir them thoroughly;

[0173] Step S3: adding waste concrete aggregate while stirring to make it evenly dispersed;

[0174] Step S4: continue to add modified phenolic resin glue, compound admixture and remaining water, and stir evenly to obtain a mixture;

[0175] Step S5, pouring the mixture into a mold, vibrating, and then curing in a humid environment at 18° C.-26° C. for 3-5 days to obtain the building material.

[0176] Wherein, in step S2, the stirring speed is started at 550 rpm to 600 rpm, mixed at 85°C for 8min to 12min, adjusted to 1200 rpm, and mixed at 90°C for 12min to 18min;

[0177] In step S4, the stirring speed is 1400 rpm to 600 rpm, and the stirring and mixing is carried out at 105° C. for 25 min to 36 min.

[0178] The content of Comparative Example 2 is different from that of Comparative Example 1 in that the raw materials of this comparative example do not contain polypropylene fiber, carbon fiber and polyacrylamide anionic surfactant, and the rest are the same as those of Comparative Example 1.

[0179] Comparative Example 3:

[0180] The comparative example provides a building material based on the recycling of waste concrete, which is made of the following raw materials in parts by weight: 66 parts of waste concrete aggregate, 90 parts of cement, 100 parts of quartz sand, 125 parts of fly ash, 3 parts of polypropylene fiber, 2.8 parts of carbon fiber, 1.3 parts of polyacrylamide anionic surfactant, 22 parts of epoxy resin, 2 parts of compound admixture and water;

[0181] The compound admixture is prepared by mixing naphthalene-based water reducer and sodium gluconate.

[0182] In the compound admixture, the mass ratio of naphthalene-based water reducer and sodium gluconate is 40:1.

[0183] The waste concrete aggregate is obtained through a series of treatments including crushing, reinforcement removal, sorting, screening, cleaning and drying of the waste concrete.

[0184] The particle size of waste concrete aggregate is 15μm to 50μm.

[0185] The cement is ordinary Portland cement, and the fly ash is ordinary micro fly ash.

[0186] The fineness modulus of quartz sand is 1.6 to 2.4; the particle size of fly ash is 1000 mesh to 1200 mesh.

[0187] The diameter of the epoxy resin is 10 μm to 18 μm.

[0188] The length of the polypropylene fiber is 8mm to 15mm, and the diameter is 0.02mm to 0.05mm; the length of the carbon fiber is 10mm to 45mm, and the diameter is 0.02mm to 0.03mm.

[0189] A method for preparing a building material based on recycling and utilizing waste concrete provided in the comparative example of the present invention comprises the following steps:

[0190] Step S1: weighing each raw material according to weight;

[0191] Step S2: Mix cement, quartz sand, fly ash, polypropylene fiber, carbon fiber, epoxy resin and part of water, and stir them thoroughly;

[0192] Step S3: adding waste concrete aggregate while stirring to make it evenly dispersed;

[0193] Step S4: continue to add polyacrylamide anionic surfactant, compound admixture and remaining water, and stir evenly to obtain a mixture;

[0194] Step S5, pouring the mixture into a mold, vibrating, and then curing in a humid environment at 18° C.-26° C. for 3-5 days to obtain the building material.

[0195] Wherein, in step S2, the stirring speed is started at 550 rpm to 600 rpm, mixed at 85°C for 8min to 12min, adjusted to 1200 rpm, and mixed at 90°C for 12min to 18min;

[0196] In step S4, the stirring speed is 1,400 revolutions per minute to 600 revolutions per minute, and the mixture is stirred at 105°C for 25 min to 36 min.

[0197] The difference between Comparative Example 3 and Example 1 lies in that: the raw materials of this comparative example do not contain modified phenolic resin glue, and the rest are the same as those in Example 1.

[0198] The weight parts of the components of Examples 1-5 and Comparative Examples 1-3 are as follows:

[0199]

[0200] Performance test experiment:

[0201] Compressive strength: Referring to GB / T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", a number of standard cube specimens with a side length of 150 mm are made, cured at room temperature for 28 days, and the compressive strength test is carried out;

[0202] Splitting tensile strength: Referring to GB / T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", a number of standard cube specimens with a side length of 150 mm are made, cured at room temperature for 28 days, and the splitting tensile strength test is carried out;

[0203] Flexural strength: Referring to GB / T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", a number of standard specimens with dimensions of 150 mm * 150 mm * 600 mm are made, cured at room temperature for 28 days, and the flexural strength test is carried out;

[0204] The building materials described in Examples 1-5 and Comparative Examples 1-2 are all subjected to relevant performance tests with reference to the "Standard for Test Methods of Mechanical Properties of Ordinary Concrete" (GB50081-2002), and the test results are as follows:

[0205] Cube compressive strength (MPa) Splitting tensile strength (MPa) Flexural strength (MPa) Example 1 39.87 3.84 4.98 Example 2 39.34 3.87 4.99 Example 3 39.43 3.75 4.95 Example 4 39.48 3.78 4.97 Example 5 39.55 3.83 4.96 Comparative Example 1 37.23 3.13 4.24 Comparative Example 2 37.14 3.15 4.21 Comparative Example 3 37.21 3.11 4.18

[0206] Combining the above examples and comparative examples, and analyzing in combination with the test results:

[0207] Through the comparison between Examples 1-5 and Comparative Examples 1-2, the building materials based on the recycled utilization of waste concrete of the present invention have better excellent mechanical properties, which is the result of the synergistic effect of each raw material.

[0208] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

Claims

1. A building material based on the recycling and reuse of waste concrete, characterized in that The building material is made of the following raw materials in parts by weight: 60 to 75 parts of waste concrete aggregate, 80 to 98 parts of cement, 85 to 108 parts of quartz sand, 96 to 145 parts of fly ash, 0.9 to 4.5 parts of polypropylene fiber, 0.4 to 5.5 parts of carbon fiber, 1 to 1.5 parts of polyacrylamide anionic surfactant, 12 to 25 parts of epoxy resin, 9 to 15 parts of modified phenolic resin glue, 1.5 to 2.4 parts of compound admixture and water; The compound admixture is prepared by mixing a naphthalene-based water reducer and sodium gluconate, and the modified phenolic resin adhesive is an epoxy-modified phenolic resin adhesive.

2. The building material based on the recycled use of waste concrete according to claim 1, wherein: In the compound admixture, the mass ratio of the naphthalene-based water reducer to the sodium gluconate is (40-45): (1-1.2).

3. The building material based on the recycling of waste concrete according to claim 1, characterized in that: The waste concrete aggregate is obtained through a series of treatments including crushing, reinforcing bar removal, sorting, screening, cleaning and drying of the waste concrete.

4. A building material based on the recycling of waste concrete according to claim 3, characterized in that: The particle size of the waste concrete aggregate is 15 μm to 50 μm.

5. A building material based on the recycling of waste concrete according to claim 1, characterized in that: The cement is ordinary Portland cement, and the fly ash is ordinary micro fly ash.

6. A building material based on the recycling and reuse of waste concrete according to claim 1, characterized in that: The fineness modulus of the quartz sand is 1.6-2.4; the particle size of the fly ash is 1000-1200 meshes.

7. An architectural material based on the recycling of waste concrete according to claim 1, characterized in that: The diameter of the epoxy resin is 10 μm to 18 μm.

8. The building material based on the recycling of waste concrete according to claim 1, characterized in that: The length of the polypropylene fiber is 8 mm to 15 mm, and the diameter is 0.02 mm to 0.05 mm; the length of the carbon fiber is 10 mm to 45 mm, and the diameter is 0.02 mm to 0.03 mm.

9. A preparation method of a building material based on the recycling of waste concrete. For a building material based on the recycling of waste concrete according to any one of claims 1-8, it is characterized in that The steps include: Step S1: weighing each raw material according to weight; Step S2: Mix cement, quartz sand, fly ash, polypropylene fiber, carbon fiber, epoxy resin and part of water, and stir them thoroughly; Step S3: adding waste concrete aggregate while stirring to make it evenly dispersed; Step S4: continue to add polyacrylamide anionic surfactant, modified phenolic resin glue, compound admixture and remaining water, and stir evenly to obtain a mixture; Step S5, pouring the mixture into a mold, vibrating, and then curing in a humid environment at 18° C.-26° C. for 3-5 days to obtain the building material.

10. The method for preparing building materials based on recycling of waste concrete according to claim 9, wherein in step S2, the stirring speed is started at 550-600 rpm, mixed at 85°C for 8-12 min, adjusted to 1200 rpm, mixed at 90°C for 12-18 min; In step S4, the stirring speed is 1400 rpm to 600 rpm, and the stirring and mixing is carried out at 105° C. for 25 min to 36 min.

Images