All-solid-waste green low-carbon rapid repairing material and preparation method thereof

Abstract

The invention discloses an all-solid-waste green low-carbon rapid repairing material, which is prepared from the following components in parts by weight: 40 to 60 parts of solid-waste-based mixed powder, 10 to 15 parts of acrylamide-based premixed liquid, 40 to 50 parts of fine aggregate, 1 to 2 parts of water reducing agent, 1 to 2 parts of 2-hydroxyethyl methacrylate and 2 to 3 parts of visible light initiator, the solid waste-based mixed powder comprises fly ash, mineral powder and coal gangue powder; the acrylamide premixed solution is a mixed solution of acrylamide and polyethylene glycol diacrylate. By adopting an all-solid waste gel system, compared with a traditional inorganic repair material, the all-solid waste gel system has the advantages of low hydration heat release rate, high compactness, high strength, chloride ion penetration resistance, high freeze thawing resistance and the like, can effectively solve the problems of air shrinkage, temperature difference shrinkage, early cracks and the like, and ensures the durability of an obtained repair layer; and the carbon emission can be reduced, and meanwhile, the high-added-value utilization of various solid wastes is realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building materials, and particularly relates to a full-solid-waste green low-carbon rapid repair material and a preparation method thereof. BACKGROUND

[0002] Concrete has been widely used in highway engineering due to its high strength and low cost. However, high-frequency driving impact, fatigue, and harsh service environment such as sun and rain can easily cause different degrees of damage to the concrete pavement, seriously affecting the durability of the road structure. In order to reduce the life cycle cost and prolong the service life of the existing road structure, effective reinforcement and long-term repair are often needed.

[0003] Concrete pavement repair materials can be divided into inorganic repair materials (such as Portland cement, phosphate cement, and sulphoaluminate cement), organic repair materials (epoxy resin and polyester), and organic-inorganic composite materials (emulsified asphalt and epoxy resin mortar). At present, polymer concrete and repair mortar are more commonly used, and repair mortar can be sprayed and poured. However, polymers such as epoxy resin have the problem of high cost. Inorganic cement repair materials refer to materials with different properties prepared by adding additives and other materials to different types of cement. According to the composition of the material, it can be divided into repair mortar mainly composed of special cement and cement-based materials mixed with other inorganic minerals. Inorganic cement rapid repair materials have the advantages of low cost, easy construction operation, and good compatibility with old structures, but also have the disadvantages of low bonding strength with old structures and high maintenance cost. The hardening of inorganic cement rapid repair materials mainly uses early strength agents to quickly promote cement hydration and hardening to achieve the effect of repair, and the cement consumption is high, which produces a high hydration heat in a short time, resulting in surface temperature cracks and affecting the repair performance. At the same time, the high cement consumption leads to high carbon emissions and high cost of the product. Therefore, it is particularly important to use industrial solid waste to prepare a full-solid-waste rapid repair material with good performance and low cost. SUMMARY

[0004] The main purpose of the present application is to solve the problems and deficiencies in the prior art, and to provide a rapid repair material prepared from full-industrial-solid-waste materials, which can reduce carbon emissions and realize high-value utilization of various solid wastes.

[0005] To achieve the above-mentioned purposes, the technical scheme adopted by the present application is as follows: The application discloses a kind of all solid waste green low carbon fast repair materials, and each component and its weight fraction include: solid waste base mixed powder 40~60 parts, acrylamide-based premix 10~15 parts, fine aggregate 40~50 parts, water reducing agent 1~2 parts, 2-hydroxyethyl methacrylate (HEMA) 1~2 parts, visible light initiator 2~3 parts;The solid waste base mixed powder includes fly ash, mineral powder and coal gangue powder;Acrylamide-based premix is the mixed solution of acrylamide and polyethylene glycol diacrylate (PEGDA).

[0006] Further, in the mixing process of the all solid waste green low carbon fast repair material, 2-hydroxyethyl methacrylate (HEMA) and a photoinitiator are introduced after the other components are uniformly mixed. After the obtained mixture is filled in the place needing repair, hardening is carried out after sunlight or ultraviolet irradiation to achieve the repair effect. In the above scheme, the visible light initiator can be 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone or the like.

[0007] In the above scheme, the molecular weight of the polyethylene glycol diacrylate is 200~700.

[0008] In the above scheme, in the acrylamide-based premix, the mass ratio of acrylamide, polyethylene glycol diacrylate (PEGDA) and water is 10~30:1~5:20~50.

[0009] In the above scheme, in the solid waste base mixed powder, the mass ratio of fly ash, mineral powder and coal gangue powder is 50~70:10~20:10~20.

[0010] In the above scheme, the fly ash is F class II or above, and the specific surface area is 320~400 m 2 / kg; the mineral powder is S75 or above, and the specific surface area is 500~800 m 2 / kg; the bulk density of the coal gangue powder is 1.2~1.8 g / cm³, the residual carbon content is 5~11%, and the particle size is 40~80 μm.

[0011] In the above scheme, the fine aggregate is medium sand, and quartz sand can be selected, and the grading requirement is: 2.0~1.0 mm content 15~30%, 1.0~0.5 mm content 45~85%, and 0.5~0.25 mm content 5~30%.

[0012] In the above scheme, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 30~40%.

[0013] The mechanical properties of the full solid waste material are generally not as good as traditional cement-based materials, especially in strength, toughness and durability. The performance requirements of repair materials are higher, especially when used for structural repair, which requires good durability. The application first uses a polymerizable composite monomer solution to disperse the full solid waste-based material, effectively improving the particle agglomeration problem and significantly improving the uniform distribution of solid waste in the matrix, providing a uniform reaction interface for subsequent reactions. The application innovatively uses a 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy) phenyl]-1-propanone visible light-responsive initiator, which is different from traditional ultraviolet initiators and has stronger biocompatibility and deeper penetration curing ability. It can also effectively reduce the thermal stress concentration caused by thermal polymerization or ultraviolet curing, has stronger light penetration, and can still achieve complete photocuring on thick-layer materials or rough / wet substrates, solving the problem of traditional UV initiators that only limit surface curing, and significantly improving the applicability and reliability of the repair system on complex substrates. Compared with thermal initiation systems or traditional ultraviolet rapid polymerization methods, the 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy) phenyl]-1-propanone visible light-responsive initiator initiates the reaction by low-energy light, reducing the heat generated during the curing process of the material, effectively alleviating the volume shrinkage stress concentration problem caused by local heating, and combining with the HEMA flexible monomer and adjustable ratio design in the application, the curing deformation and interface cracking can be controlled from the source. It can be uniformly dispersed in the PEGDA / HEMA double monomer system without adding external solvents. The initiation free radical activity is moderate, which can avoid the phenomenon of insufficient internal stress release or polymerization interruption caused by too fast crosslinking rate, and form a continuous, high-toughness, high-interface-adaptive three-dimensional network structure by copolymerization with flexible segments. By introducing HEMA as a reactive diluent in the PEGDA base system, the viscosity of the system can be effectively reduced, the operability can be improved, and the crosslinking density and internal stress release mechanism can also be effectively controlled, making the formed material more stable during the curing process, avoiding the cracking problem caused by stress accumulation in traditional injection molding systems, etc.

[0014] Unlike traditional molding methods that require molds or heat treatment, the application relies on visible light in-situ curing technology, which can achieve rapid shaping without the need for mold or heat treatment molding conditions, significantly shortening the construction cycle and meeting the rapid repair needs. The dispersed solid waste particles are cured by in-situ curing, thereby achieving the purpose of rapid hardening of the full solid waste-based material. The unreacted potential pozzolanic active components in the material continue to participate in the later hydration reaction during the service period, significantly enhancing the post-strength, toughness and corrosion resistance of the repair material, achieving the performance improvement of the "fast hardening-post strength" two-stage performance.

[0015] The preparation method of the full-solid waste green low-carbon rapid repair material comprises the following steps: 1) preparing a premix liquid: acrylamide and polyethylene glycol diacrylate (PEGDA) are weighed and added to water, and stirred uniformly (10-20 min) to prepare a premix liquid; 2) preparing a solid waste-based mixed powder: fly ash, mineral powder and coal gangue powder are weighed and stirred uniformly (5-8 min) to obtain a solid waste-based mixed powder; 3) preparing a mixed slurry: acrylamide-based premix liquid, water reducing agent, solid waste-based mixed powder and fine aggregate are weighed according to the proportion and added to a stirrer, and an alkali solution is added to adjust the pH value of the obtained mixture to 7-9, and the stirring treatment (1-3 min) is continued to obtain a mixed slurry; 4) preparing a rapid repair material: the obtained mixed slurry, 2-hydroxyethyl methacrylate (HEMA) and a visible light initiator are added to the stirrer, and stirring treatment (10-20 s) is carried out to uniformly mix, thereby obtaining the full-solid waste green low-carbon rapid repair material.

[0016] Further, after the obtained full-solid waste green low-carbon rapid repair material is poured into a part to be repaired, light or ultraviolet light is irradiated for 20-30 min, and then the repair effect is achieved.

[0017] The present application utilizes a polymerizable monomer solution to disperse full-solid waste powder, and then the slurry is gelled through in-situ polymerization reaction to promote the preparation of a repair material with high strength and good compactness. The slurry is coagulated and formed by using a three-dimensional cross-linked gel network to obtain a filling material with sufficient strength. The solid content of the repair material designed in the present application can reach 80-90%, and after curing, the drying shrinkage is reduced, the overall compactness is improved, and the mechanical properties of the rapid repair material are further improved.

[0018] The present application introduces a dual-initiation system (visible light + free radical synergistic system), realizes rapid polymerization and curing through photochemical reaction, greatly improves the early strength and molding speed, controls the curing heat and volume shrinkage, reduces the construction stress and structural damage risk. The dual-initiator system (visible light assisted) used in the present application has higher light penetration depth and faster reaction rate, and combined with flexible monomers (such as HEMA) to regulate viscosity and permeability, it can realize sufficient filling and curing of deep cracks and substrate micropores.

[0019] The present application replaces the hydration exothermic process with an in-situ photocuring process, and introduces flexible chain segment monomers (such as HEMA) and interfacial modifiers (PEGDA / HEMA) to buffer shrinkage stress, control the volume change of the material hardening process from the source, and effectively inhibit crack formation. The introduced high molecular low viscosity system (PEGDA / HEMA) interfacial active agent combination not only gives the material excellent flowability and wettability, but also plays a key role in interfacial regulation. On the one hand, the low surface tension of PEGDA / HEMA enables the system to actively penetrate into micron-sized pores and interfacial cracks when contacting rough, porous, wet, or even aged substrates, achieving interfacial adaptive spreading and filling; on the other hand, its bifunctional structure (PEG segment provides flexibility and diffusion, and acrylic group provides reactivity) can achieve the synergistic effect of mechanical interlocking + chemical bonding during photocuring, significantly improving the bonding strength of the new and old interfaces.

[0020] Traditional cement-based rapid repair materials rely on intense hydration exothermic reactions during hardening, which can easily cause thermal stress concentration and dry shrinkage cracking at the new and old interfaces. In addition, due to the large size and rough surface of cement particles, they cannot effectively penetrate into the microstructure, resulting in poor interfacial adhesion and insufficient bonding strength. The present application introduces a PEGDA / HEMA interfacial modifier system, which can deeply penetrate before photocuring and form a dense cross-linked film after curing, thereby reducing interfacial stress concentration and the risk of interfacial defects. It is particularly suitable for repair applications of complex structures or water-containing substrates.

[0021] The present application can effectively promote the active penetration of low-viscosity photocured full-solid waste composite repair slurry materials based on the PEGDA / HEMA system into micro-pores and rough interfaces for curing, forming a mechanical interlocking + chemical bonding dual effect, significantly improving the bonding strength of the new and old interfaces, and being suitable for wet, complex, or aged substrates. The present application utilizes the potential pozzolanic activity and micro-aggregate effect of solid waste, and can still release SiO2 / Al2O3 components during the service period after curing, participating in subsequent pozzolanic reaction / secondary hydration, further improving the compactness, durability, and mechanical properties of the material in the later stage.

[0022] The application adopts a full solid waste cementitious system, early strength uses in-situ polymerization reaction to improve strength, and at the same time solves the problems that the hydration reaction of ordinary cement rapid repair material is violent, the heat release rate is high, temperature stress is easily caused, the water loss rate is fast, and dry shrinkage, temperature difference shrinkage and other problems are caused. The solidified repair material provided by the application realizes in-situ solidification repair of the concrete surface or cracks with high bonding force and low shrinkage rate in a short time through multiple means of synergistic photocuring of double initiators, synergistic polymerization of flexible monomers and interface activity enhancement, and is especially suitable for complex engineering site repair tasks which are difficult to construct or time-limited. The application solves the problems of insufficient solidification depth, high brittleness, large shrinkage and poor bonding force with the base. The application uses the pozzolanic effect and micro aggregate effect of solid waste base materials to solve the problem of poor later strength. The introduction of high molecular materials enables the slurry to quickly penetrate into the interface of raw materials, improving the bonding force of the new and old interfaces.

[0023] Compared with the prior art, the application has the following beneficial effects: 1) The application adopts a full solid waste cementitious system, which can eliminate the use of cement compared with traditional inorganic repair materials, realizes the resource utilization of various industrial wastes, has significant economic and environmental benefits, and has the effect of rapid solidification, which can effectively shorten the repair time. 2) The application uses the pozzolanic effect and micro aggregate effect of solid waste base materials to effectively solve the problems of insufficient later hydration, insufficient structural density and low long-term strength, and even strength decline, and realizes high early strength without using cementitious materials. 3) The full solid waste base material used in the application has a low hydration heat release rate compared with traditional inorganic repair materials, which can effectively solve the problems of dry shrinkage, temperature difference shrinkage, early cracks and other problems, and ensure the durability of the obtained repair layer. The micro aggregate effect of the full solid waste base material further improves the density, improves the resistance to chloride ion penetration and freeze-thaw resistance, and is more suitable for road repair in long-term heavy load or harsh weather conditions. DETAILED DESCRIPTION

[0024] The application will be further described in detail below through specific implementation cases. The specific implementation cases are implemented on the premise of the application technology, and the detailed implementation mode and specific operation process are given, but the scope of protection of the application is not limited to the following implementation cases.

[0025] In the following examples, the fly ash is provided by Zhongjian West Construction Xinjiang Co., Ltd., and its category is F class II, and the specific surface area is 350 m 2 / kg; the mineral powder is provided by Zhongjian West Construction Xinjiang Co., Ltd., and its grade is S75, and the specific surface area is 580 m 2 / kg; the coal gangue powder used was provided by Hebei Qingjiang New Material Technology Co., Ltd., and had a bulk density of 1.2-1.8 g / cm³, residual carbon (5-11%), and a particle size range of 40-80 μm. The medium sand used was quartz sand, and the gradation requirement was as follows: 2.0-1.0 mm content 20-25%, 1.0-0.5 mm content 25-30%, and 0.5-0.25 mm content 45-50%.

[0026] The water reducing agent used was a polycarboxylic acid water reducing agent, and the water reducing rate was 25%.

[0027] The visible light initiator used was Irgacure 2959, which was provided by Ningbo Huiwangcheng Plastic Co., Ltd.

[0028] Example 1 A full-solid-waste green low-carbon rapid repair material, and a preparation method thereof, the preparation method comprising the following steps: 1) 45 parts of water were weighed, 30 parts of acrylamide were weighed and added to the water, and then 5 parts of polyethylene glycol diacrylate (PEGDA) were added, which was placed in a magnetic stirrer and stirred at a speed of 1500 rpm for 15 min to prepare an acrylamide-based premix liquid; 2) 60 parts of fly ash, 20 parts of mineral powder, and 20 parts of coal gangue powder were weighed and added to a mixer, and mixed for 8 min to obtain a full-solid-waste mixed material; 3) 15 parts of the acrylamide-based premix liquid, 1 part of the polycarboxylic acid water reducing agent, 50 parts of the mixed powder, and 40 parts of the medium sand were weighed and added to a stirrer, and ammonia water (concentration 25-28%) was used to adjust the pH to 8, and the stirring time was 1 min to obtain a mixed slurry; 4) The obtained mixed slurry, 1 part of 2-hydroxyethyl methacrylate (HEMA), and 2 parts of Irgacure 2959 were added to the stirrer and stirred for 10 s, and then poured out to obtain a full-solid-waste-based rapid repair material.

[0029] The obtained rapid repair material is cast into a shape with a size of 100mmx100mmx100mm, and after vibration to the surface of the slurry, it is placed in a static chamber, and after ultraviolet irradiation for 0.5h, the compressive strength is detected after demolding, and the remaining test block is placed in a standard curing chamber (humidity not less than 95%, temperature 20±2℃) for curing for 3 days and 28 days, and then the compressive strength test is performed. The 0.5h compressive strength is 8.4MPa, the splitting tensile strength is 1.2MPa, and the electric flux is 1100C; the 3-day compressive strength is 11.2MPa, the splitting tensile strength is 2.4MPa, and the electric flux is 785C; the 28-day compressive strength is 22.4MPa, the splitting tensile strength is 4.1MPa, and the electric flux is 450C; the initial viscosity of the material is 11.7Pa·s, the 7-day interfacial splitting bonding strength is 3.7MPa, and the 3-day drying shrinkage rate is 5.378x10 -6 .

[0030] Example 2 A full solid waste green low-carbon rapid repair material, the preparation method comprising the following steps: 1) Take 20 parts of water, take 20 parts of acrylamide and add it to the water, then add 4 parts of polyethylene glycol diacrylate (PEGDA), and place it in a magnetic stirrer and stir at a speed of 1500rpm for 20min to prepare an acrylamide-based premix; 2) Take 70 parts of fly ash, take 15 parts of mineral powder, and take 15 parts of coal gangue powder and add them to a mixer, mix for 8min to obtain a solid waste-based mixed material; 3) Take 10 parts of acrylamide-based premix, take 2 parts of polycarboxylic acid water reducer, take 60 parts of solid waste-based mixed powder, and take 45 parts of medium sand, and add them to a stirrer, and use ammonia water to adjust the pH to 7, and stir for 3min to obtain a mixed slurry; 4) Take the obtained mixed slurry, 1 part of 2-hydroxyethyl methacrylate (HEMA), and 2 parts of Irgacure 2959, and add them to a stirrer and stir for 20s, then pour out to obtain a full solid waste-based rapid repair material.

[0031] The obtained rapid repair material is cast into a shape with a size of 100mmx100mmx100mm, and is vibrated to the surface of the floating slurry and then placed in a static chamber. After being irradiated by sunlight for 0.5h, the mold is removed for compression strength detection. The remaining test block is placed in a standard curing chamber (humidity is not less than 95%, temperature is 20±2℃) for curing for 3 days and 28 days, and then the compression strength test is performed. The 0.5h compression strength is measured to be 7.6MPa, the splitting tensile strength is 1.7MPa, the electric flux is 920C, the 3-day strength is 10.4MPa, the splitting tensile strength is 2.7MPa, the electric flux is 640C, the 28-day strength is 21.5MPa, the splitting tensile strength is 3.8MPa, the electric flux is 320C, the initial viscosity of the material is 10.8Pa·s, the 7-day interface splitting bonding strength is 4.4MPa, and the 3-day drying shrinkage rate is 6.238x10 -6 .

[0032] Example 3 A full-solid-waste green low-carbon rapid repair material, and a preparation method thereof, are disclosed. 1) 50 parts of water are weighed, 15 parts of acrylamide are weighed and added into the water, and then 5 parts of polyethylene glycol diacrylate (PEGDA) are added. The mixture is placed in a magnetic stirrer and stirred at a speed of 1500rpm for 20min to prepare an acrylamide-based premix liquid; 2) 50 parts of fly ash, 20 parts of mineral powder and 10 parts of coal gangue powder are weighed and added into a mixer, and mixed for 8min to obtain a solid-waste-based mixed material; 3) 15 parts of the acrylamide-based premix liquid, 1 part of a polycarboxylic acid water reducer and 40 parts of the solid-waste-based mixed powder are weighed, 40 parts of medium sand are added into a stirrer, and the pH value is adjusted to 9 by using ammonia water. The mixture is stirred for 3min to obtain a mixed slurry; 4) The obtained mixed slurry, 1 part of 2-hydroxyethyl methacrylate (HEMA) and 1 part of Irgacure 2959 are added into the stirrer and stirred for 10s, and then poured out to obtain a full-solid-waste-based rapid repair material.

[0033] The obtained rapid repair material is cast into shape, the size of the test piece is 100mmx100mmx100mm, and after vibrating to the surface of the floating slurry, it is placed in a static chamber, and after ultraviolet irradiation for 0.5h, the compression strength test is carried out after the mold is removed. The remaining test block is placed in a standard curing chamber (humidity not less than 95%, temperature 20±2℃) for 3 days and 28 days, and then the compression strength test is carried out. The 0.5h compression strength is 8.8MPa, the splitting tensile strength is 2.3MPa, and the electric flux is 710C; the 3-day compression strength is 12.1MPa, the splitting tensile strength is 3.4MPa, and the electric flux is 920C; the 28-day compression strength is 24.5MPa, the splitting tensile strength is 4.3MPa, and the electric flux is 340C, the initial viscosity of the material is 11.3Pa·s, the 7-day interface splitting bonding strength is 4.1MPa, and the 3-day drying shrinkage rate is 5.769x10 -6 .

[0034] Comparative Example 1 A kind of green low carbon rapid repair material of all solid waste, its preparation method includes the following steps: 1) take water 50 parts, take acrylamide 15 parts and add it into water, then add 2-hydroxyethyl methacrylate (HEMA) 1 part and Irgacure 2959 1 part in sequence, place it in a magnetic stirrer and stir at 1500rpm speed for 20min, to prepare a premix liquid; 2) take fly ash 50 parts, take mineral powder 20 parts, take coal gangue powder 10 parts and add them into a mixer, mix for 8min, to obtain a solid waste-based mixed material; 3) take the premix liquid 15 parts, take polycarboxylate superplasticizer 1 part, take solid waste-based mixed material 40 parts, take medium sand 40 parts, add them into a stirrer, and use ammonia water to adjust pH=9, stir for 3min, to obtain a rapid repair material of all solid waste base.

[0035] The obtained repair material is cast into shape, the size of the test piece is 100mmx100mmx100mm, and after vibrating to the surface of the floating slurry, it is placed in a static chamber, and after ultraviolet irradiation for 0.5h, the compression strength test is carried out after the mold is removed. The remaining test block is placed in a standard curing chamber (humidity not less than 95%, temperature 20±2℃) for 3 days and 28 days, and then the compression strength test is carried out. The 0.5h compression strength is 8.8MPa, the splitting tensile strength is 2.3MPa, and the electric flux is 710C; the 3-day compression strength is 12.1MPa, the splitting tensile strength is 3.4MPa, and the electric flux is 920C; the 28-day compression strength is 24.5MPa, the splitting tensile strength is 4.3MPa, and the electric flux is 340C, the initial viscosity of the material is 11.3Pa·s, the 7-day interface splitting bonding strength is 4.1MPa, and the 3-day drying shrinkage rate is 5.769x10 -6The interface bonding performance is poor due to the aggregation of the powder in the section, and the electric flux is large, indicating that the anti-ion corrosion ability is poor and the long-term durability is poor.

[0036] Comparative Example 2 A full solid waste green low-carbon rapid repair material, the preparation method comprising the following steps: 1) Take 50 parts of water, take 15 parts of acrylamide, add it to water, then add 5 parts of polyethylene glycol diacrylate (PEGDA), place it in a magnetic stirrer and stir at a speed of 1500 rpm for 20 min, to prepare an acrylamide-based premix; 2) Take 50 parts of fly ash, take 20 parts of mineral powder, and take 10 parts of coal gangue powder, add them to a mixer, mix for 8 min, to obtain a solid waste-based mixed material; 3) Take 15 parts of acrylamide-based premix, take 1 part of polycarboxylic acid water reducer, take 40 parts of mixed powder, and take 40 parts of medium sand, add them to a stirrer, adjust the pH to 9 with ammonia water, and stir for 3 min, to obtain a mixed slurry; 4) Take the obtained mixed slurry, add 1 part of Irgacure 2959 to the stirrer and stir for 10 s, then pour it out, to obtain a full solid waste-based rapid repair material.

[0037] The obtained rapid repair material is poured into a mold with a size of 100 mm x 100 mm x 100 mm, vibrated, and then placed in a static chamber after the surface is floated. After being irradiated with ultraviolet light for 0.5 h, the mold is removed for compression strength detection. The remaining test block is placed in a standard curing chamber (humidity not less than 95%, temperature 20±2℃) for 3 days and 28 days, and then subjected to compression strength test. The measured 0.5 h compression strength is 3.5 MPa, the splitting tensile strength is 1.1 MPa, and the electric flux is 1220; the 3-day compression strength is 5.7 MPa, the splitting tensile strength is 1.4 MPa, and the electric flux is 1120; the 28-day compression strength is 10.6 MPa, the splitting tensile strength is 1.7 MPa, and the electric flux is 1025; the initial viscosity of the material is 22.3 Pa·s, the 7-day interface splitting bonding strength is 1.8 MPa, and the 3-day drying shrinkage rate is 87.358 x 10 -6 .

[0038] Comparative Example 3 A full solid waste green low-carbon rapid repair material, the preparation method comprising the following steps: 1) Take 45 parts of water, take 30 parts of acrylamide, add it to water, then add 5 parts of polyethylene glycol diacrylate (PEGDA), place it in a magnetic stirrer and stir at a speed of 1500 rpm for 15 min, to prepare an acrylamide-based premix; 2) Take 60 parts of fly ash, take 20 parts of slag, take 20 parts of coal gangue powder, add them to the mixer, mix for 8 minutes, and get the full solid waste mixed material; 3) Take 15 parts of acrylamide premix, take 1 part of polycarboxylic acid water reducer, take 50 parts of mixed powder, take 40 parts of medium sand, add them to the mixer, adjust the pH to 8 with ammonia water, stir for 1 minute, and get the mixed slurry; 4) Take the obtained mixed slurry, 1 part of 2-hydroxyethyl methacrylate (HEMA), add it to the mixer and stir for 10 seconds, pour it out, and get the full solid waste based rapid repair material. The rapid repair material is shaped, the specimen size is 100mmx100mmx100mm, and the surface is vibrated and floated. After placing in the static chamber, the ultraviolet light is irradiated for 0.5h, the compression strength is detected after demolding, the remaining test block is placed in the standard curing chamber (humidity is not less than 95%, temperature is 20±2℃), and the compression strength test is carried out after 3 days and 28 days. The 0.5h rapid repair material is not cured and has no strength, so it does not have the characteristics of rapid repair, the 3-day strength is 3.1MPa, the splitting tensile strength is 1.1MPa, and the electric flux is 1720. The 28-day strength is 10.5MPa, the splitting tensile strength is 1.7MPa, the electric flux is 1560, the initial viscosity of the material is 13.9Pa·s, the 7-day interface splitting bonding strength is 2.4MPa, and the 3-day drying shrinkage rate is 67.233x10 -6 .

[0039] The present application is not limited to the above-mentioned embodiments, and those skilled in the art can make several improvements and refinements without departing from the principles of the present application, which are also considered within the protection scope of the present application. The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

Claims

1. A green, low-carbon, all-solid waste rapid repair material, comprising the following components and their weight percentages: 40-60 parts of solid waste-based mixed powder, 10-15 parts of acrylamide-based premixed liquid, 40-50 parts of fine aggregate, 1-2 parts of water reducer, 1-2 parts of 2-hydroxyethyl methacrylate, and 2-3 parts of visible light initiator; the solid waste-based mixed powder comprises fly ash, mineral powder, and coal gangue powder; the acrylamide-based premixed liquid is a mixture of acrylamide and polyethylene glycol diacrylate.

2. The all-solid waste green low-carbon rapid repair material according to claim 1 is characterized in that: During the mixing process, 2-hydroxyethyl methacrylate and visible light initiator are introduced after the other components are evenly mixed.

3. The all-solid waste green low-carbon rapid repair material according to claim 1 is characterized in that: In the acrylamide-based premix, the mass ratio of acrylamide, polyethylene glycol diacrylate, and water is 10-30:1-5:20-50.

4. The all-solid waste green low-carbon rapid repair material according to claim 1 is characterized in that: In the solid waste-based mixed powder, the mass ratio of fly ash, mineral powder and coal gangue powder is 50~70:10~20:10~20.

5. The all-solid waste green low-carbon rapid repair material according to claim 1 is characterized in that: The fly ash is of Class F II or above, with a specific surface area of ​​320-400 m 2 / kg; the mineral powder should be S75 grade or above, with a specific surface area of ​​500~800 m 2 / kg; the bulk density of coal gangue powder is 1.2~1.8 g / cm³, the residual carbon content is 5~11%, and the particle size is 40~80μm.

6. The all-solid waste green low-carbon rapid repair material according to claim 1 is characterized in that: The fine aggregate is medium-grade sand, and the grading requirements are: 15-30% of 2.0-1.0 mm, 45-85% of 1.0-0.5 mm, and 5-30% of 0.5-0.25 mm.

7. The all-solid waste green low-carbon rapid repair material according to claim 1, characterized in that: The water reducing agent is a polycarboxylic acid water reducing agent, and its water reducing rate is 30-40%.

8. The all-solid waste green low-carbon rapid repair material according to claim 1 is characterized in that: The visible light initiator is 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone.

9. The method for preparing the all-solid waste green low-carbon rapid repair material according to any one of claims 1 to 8, characterized in that: The steps include: 1) Prepare the premix: Add weighed acrylamide and polyethylene glycol diacrylate to water and stir to prepare an acrylamide-based premix. 2) Preparation of solid waste-based mixed powder: Mix the weighed fly ash, mineral powder, and coal gangue powder evenly to obtain a solid waste-based mixed powder; 3) Preparation of mixed slurry: Add the acrylamide-based premix, water reducer, solid waste-based mixed powder, and fine aggregate weighed according to the proportion into a blender, add alkali solution to adjust the pH value of the resulting mixture to 7-9, and continue stirring to obtain a mixed slurry; 4) Preparation of rapid repair material: The obtained mixed slurry, 2-hydroxyethyl methacrylate, and visible light initiator are added into a blender and stirred to obtain the all-solid waste green and low-carbon rapid repair material.

10. The preparation method according to claim 9, characterized in that The obtained all-solid waste green low-carbon rapid repair material is poured into the part to be repaired, and then exposed to sunlight or ultraviolet light for 20 to 30 minutes to solidify and achieve the repair effect.