CN115536431B - Alkali-activated recycled aggregate composite foam concrete for roof panels and preparation method thereof - Google Patents
Alkali-activated recycled aggregate composite foam concrete for roof panels and preparation method thereof Download PDFInfo
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- CN115536431B CN115536431B CN202211400377.7A CN202211400377A CN115536431B CN 115536431 B CN115536431 B CN 115536431B CN 202211400377 A CN202211400377 A CN 202211400377A CN 115536431 B CN115536431 B CN 115536431B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses alkali-activated recycled aggregate composite foam concrete for roof panels and a preparation method thereof, wherein the alkali-activated recycled aggregate composite foam concrete comprises the following raw materials in parts by weight: 60-80 parts of modified recycled aggregate, 10-20 parts of alkali activator, 5-10 parts of cement, 5-10 parts of foaming agent, 20-30 parts of fly ash, 10-30 parts of modified fiber, 0.5-3 parts of foam stabilizer, 10-30 parts of slag micro powder, 70-100 parts of water and 5-10 parts of water reducer. The alkali-activated recycled aggregate composite foam concrete provided by the invention solves the problems of poor volume stability, low strength and poor durability of the foam concrete, has the anti-permeability performance of the super-hydrophobic self-protection effect, and has important theoretical significance and engineering application value when being used for constructing a roof heat-insulation waterproof system.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to alkali-activated recycled aggregate composite foam concrete for a roof panel and a preparation method thereof.
Background
The foam concrete is a porous concrete material prepared by preparing a foaming agent solution into prefabricated foam in a mechanical foaming mode, adding the prefabricated foam into cement slurry, mixing, stirring, casting, molding and maintaining, has the functions of light weight, heat insulation, impact resistance, shock resistance, sound insulation, humidity adjustment and the like, and is widely applied to construction of maintenance structures. In recent years, the application range of foam concrete has been developed from simple filling to a plurality of medium-high end application scenes such as integration of building fire prevention and high efficiency energy conservation, impact resistance, high temperature heat insulation, adsorption filtration and the like, but the foam concrete has low strength and belongs to hydrophilic materials, the foam concrete is easy to cause leakage in the service process, the service life is seriously influenced, and the foam concrete also becomes one of the bottlenecks for restricting the application of the foam concrete.
In the application of roof panels, researchers develop EPS passive heat-insulating roof panels which are prepared by mixing and prefabricating cement and polyethylene foam test blocks under the action of a proper amount of additives. The heat insulation roof has the characteristics of light weight, high strength and fire resistance, is convenient and quick to construct and excellent in heat insulation performance, and realizes the combination of a semi-prefabricated semi-cast-in-place process. Besides using roof boards to construct a roof system, people also provide a concept of a cast-in-place foam concrete energy-saving waterproof integrated system, and the method is a roof structure which is composed of a foam concrete heat-preservation and slope-finding layer, a high-molecular waterproof coiled material composite waterproof layer and a polymer waterproof mortar protective layer and has the effects of energy saving and water prevention. Besides the functions of energy conservation, heat preservation and slope finding, the cast-in-place foam concrete layer also has the advantages of buffering large deformation and large stress, and the whole system is made of inorganic materials except the high-molecular composite waterproof coiled material, so that the material has the essential properties of economy, environmental protection, durability and the like.
However, due to the instability of the foam, the foam concrete is easy to collapse after being poured. When the density of the foam concrete is continuously reduced, the proportion of foam in the main body composition is continuously increased compared with slurry, so that the instability phenomenon of bubbles is easily caused, and the problems of uneven pore diameter, a large number of communicating pores and poor mechanical property of the hardened foam concrete are caused. In addition, due to the high water absorption property of the foam concrete, when the foam concrete is soaked in a water environment for a long time, harmful media and water in the environment can enter the foam concrete, and the durability of the foam concrete is greatly threatened while the mechanical property and the heat preservation property of the foam concrete are reduced.
From the whole roofing system, it has the following drawbacks: (1) There is the gap between heat preservation and the waterproof layer, also has the clearance between the heated board, runs into rainy weather, and during the rainwater probably flowed into these gaps, erosion heat preservation and waterproof layer caused heat preservation and waterproof layer effect to subtract suddenly. (2) The waterproof layer is easy to damage in the construction process, the waterproof layer is usually tightly attached to the surface of the roof structure, and once roof cracking and deformation occur, the waterproof layer can be torn, so that the waterproof function of the whole roof structure is influenced. In addition, the heat insulation layer is arranged on the waterproof layer, so that the problem of damage to the waterproof layer can be caused inevitably in the construction process. And (3) the treatment difficulty of the leakage points is high, and the consumption cost is extremely high. (4) The thermal insulation performance of the roof is poor, and rainwater can be accumulated between the thermal insulation layer and the waterproof layer to influence the thermal insulation performance.
Therefore, improving the impermeability and hydrophobicity of foam concrete in roofing systems is a significant concern.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the alkali-activated recycled aggregate composite foam concrete for the roof panel and the preparation method thereof, solves the problems of poor volume stability, low strength and poor durability of the foam concrete, has the anti-permeability performance of the super-hydrophobic self-protection effect, and has important theoretical significance and engineering application value when being used for constructing a roof heat-insulation waterproof system.
In order to achieve the purpose, the invention provides the following technical scheme:
an alkali-activated recycled aggregate composite foam concrete for roof panels comprises the following raw materials in parts by weight: 60-80 parts of modified recycled aggregate, 10-20 parts of alkali activator, 15-25 parts of cement, 5-10 parts of foaming agent, 20-30 parts of fly ash, 10-30 parts of modified fiber, 0.5-3 parts of foam stabilizer, 10-30 parts of slag micro powder, 70-100 parts of water and 5-10 parts of water reducer.
Preferably, the alkali activator comprises sodium hydroxide, calcium oxide and sodium silicate, and the mass ratio of the sodium hydroxide to the calcium oxide to the sodium silicate is 1:3-5:2-3; the foaming agent is one or more of sodium lauroyl sarcosinate, 30% hydrogen peroxide by mass concentration, polymethacrylic acid and sodium methallyl sulfonate; the cement is one or more of 42.5 common Portland cement, 52.5 common Portland cement and 42.5 quick-hardening sulphoaluminate cement; the foam stabilizer is one or more of hydroxypropyl methyl cellulose ether, calcium stearate, trisodium phosphate and polymethacrylamide; the water reducing agent is one of sodium methylene dinaphthalene sulfonate and polycarboxylic acid water reducing agent.
Preferably, the preparation method of the modified recycled aggregate comprises the following steps:
(1) Crushing the waste concrete and then sieving the crushed waste concrete with a 60-mesh sieve to obtain regenerated micro powder; adding the regenerated micro powder into a hydrochloric acid solution, soaking, then adding into a ball milling tank, carrying out ball milling, and filtering, washing and drying after the ball milling is finished to obtain pretreated regenerated micro powder;
(2) Adding the pretreated regenerated micro powder in the step (1) into a ball milling tank, then adding gamma-mercaptopropyl-trimethoxysilane, carrying out ball milling, adding into deionized water after the ball milling is finished, then adding volcanic ash and nano-silica, carrying out stirring reaction, and filtering and drying after the reaction is finished to obtain modified regenerated micro powder;
(3) And (3) adding the modified regenerated micro powder obtained in the step (2) into deionized water, then adding PVA and tridecafluorooctyltriethoxysilane, carrying out constant-temperature reaction, drying and crushing after the reaction is finished, and sieving by a 80-mesh sieve to obtain the modified regenerated aggregate.
Preferably, the mass concentration of the hydrochloric acid solution in the step (1) is 4-7%, and the dipping condition is 5-10h at room temperature; the ball milling speed is 1000-2000r/min, and the time is 1-3h; pretreating the regenerated micro powder in the step (2): gamma-mercaptopropyl trimethoxysilane: volcanic ash: the mass ratio of the nano silicon dioxide is 100:3-6:10-15:10-20 parts of; the ball milling speed is 2000-3000r/min, and the ball milling time is 0.5-1h; the temperature of the stirring reaction is 60-80 ℃, and the time is 2-4h.
Preferably, the modified recycled micro powder in the step (3): PVA: the mass ratio of the tridecafluorooctyltriethoxysilane is 100:2-4:5-7; the constant temperature reaction is carried out at 80-100 ℃ for 1-3h.
Preferably, the preparation method of the modified fiber comprises the following steps:
(a) Adding glass fiber and polypropylene fiber into potassium permanganate solution for soaking, and filtering, washing, drying and ball-milling after soaking to obtain mixed fiber;
(b) And (b) adding the mixed fiber obtained in the step (a) into absolute ethyl alcohol, then adding stearic acid and isobutyl triethoxysilane, stirring for reaction, and filtering, washing and drying after the reaction is finished to obtain the modified fiber.
Preferably, the concentration of the potassium permanganate solution in the step (a) is 5-10g/L; the mass ratio of the glass fiber to the polypropylene fiber is 3:1-2; the ball milling speed is 1500-2500r/min, and the time is 1-2h.
Preferably, the mass ratio of the mixed fiber, the stearic acid and the isobutyl triethoxysilane in the step (b) is 100:10-20:5-10; the temperature of the stirring reaction is 50-80 ℃, and the reaction time is 3-6h.
The invention also discloses a preparation method of the alkali-activated recycled aggregate composite foam concrete for the roof board, which comprises the following steps:
weighing raw materials according to a formula, mixing and stirring modified recycled aggregate, alkali activator, cement, fly ash, modified fiber, slag micro powder and water reducer to prepare a uniform mixture, wherein the stirring speed is 300-400 r/min;
step two, stirring and mixing the foaming agent, the foam stabilizer and water uniformly to obtain a foaming solution;
and step three, adding the foaming solution obtained in the step two into the mixture obtained in the step one, stirring until the mixture is uniformly mixed, then performing injection molding, and putting the mixture into a standard curing box for curing to obtain the alkali-activated recycled aggregate composite foam concrete for the roof panel.
The invention also protects the application of the alkali-activated recycled aggregate composite foam concrete for the roof board in the roof board.
The aggregate prepared by the waste concrete is called recycled concrete aggregate (recycled aggregate for short), if the recycled aggregate prepared by simple crushing and screening processes has more edges and corners, rough surface and hardened cement mortar contained in the components, and in addition, a large amount of microcracks are generated in the concrete block due to damage accumulation in the crushing process, the recycled aggregate has high porosity, high water absorption, small stacking density, high porosity and high crushing index. The recycled concrete prepared by the recycled aggregate has large water content, low strength after hardening, low elastic modulus, and lower durability such as impermeability, frost resistance, carbonization resistance, shrinkage, creep and chloride ion permeability resistance than common concrete. Because the quality difference of the waste concrete is large, the performance difference of the recycled aggregate prepared by a simple process is also large, and the popularization and the application of the recycled aggregate are inconvenient. In order to improve the performance of recycled concrete, the low-quality recycled aggregate obtained by simple crushing needs to be subjected to strengthening treatment, namely, the performance of the aggregate is improved by improving the particle shape of the aggregate and removing hardened set cement attached to the surface of the recycled aggregate: the performance of the reinforced recycled aggregate is obviously improved, and the performance difference of the recycled aggregate prepared from waste concrete with different strength grades is smaller, so that the quality control of the recycled aggregate is facilitated, and the popularization and the application of the recycled concrete are facilitated.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the alkali-activated recycled aggregate composite foam concrete for the roof panel, provided by the invention, the recycled aggregate is subjected to strengthening modification treatment, and the waste concrete is firstly subjected to crushing and sieving treatment to remove impurities such as metal, wood, bricks and the like, and then is subjected to dipping and ball milling under an acidic condition to obtain active recycled micro powder; then, adding gamma-mercaptopropyl-trimethoxysilane to carry out sulfhydrylation on the regenerated micro powder, improving the reaction activity of the regenerated micro powder, and then reacting the volcanic ash and the nano-silica with the volcanic ash and the nano-silica, wherein the volcanic ash and the nano-silica not only can enable fine active particles to directly fill pores of the regenerated aggregate, but also can enable the active particles to react with sulfhydryls on the regenerated micro powder to generate a new hydration product, so that the surface adhesion of the volcanic ash and the nano-silica on the regenerated aggregate is improved, the pores of the regenerated aggregate can be further filled, the compactness of the regenerated aggregate is improved, and the water absorption of the regenerated aggregate is reduced, thereby improving the microhardness of an old interface transition zone between the regenerated aggregate and the new adhesion mortar and the stone, and the strength and durability of the regenerated aggregate; and finally, reacting the recycled aggregate coated with the volcanic ash and the nano-silica on the surface with PVA and tridecafluorooctyltriethoxysilane, filling pores in mortar in the recycled aggregate, generating silanol after the fluorosilane is subjected to hydrolysis reaction when meeting water, reacting with hydroxyl and sulfydryl on the surface of the recycled aggregate, further fixing the silanol on the surface of the material, and forming a layer of molecular film formed by combining covalent bonds, so that the surface energy of the recycled aggregate is reduced, thereby reducing the water absorption of the recycled aggregate, meanwhile, the tridecafluorooctyltriethoxysilane is used as a hydrophobic agent, is added into the recycled aggregate by an internal doping method, and the hydrophobic modified powder is used as a partial cementing material and can improve the impermeability and hydrophobicity of the cement-based material to a certain extent.
(2) The invention provides alkali-activated recycled aggregate composite foam concrete for roof panels, which is prepared by the steps of firstly carrying out acid treatment on glass fibers and polypropylene fibers, and then carrying out ball milling activation to activate the surfaces of the fibers and complicate the structure of the fibers, so that the reaction efficiency and the reaction activity of the fibers and small molecular compounds are improved; the stearic acid and isobutyl triethoxy silane are added, so that on one hand, the dispersibility among the mixed fibers can be improved, and the mixed fibers are prevented from agglomerating, and on the other hand, the stearic acid can also improve the internal pore structure of the foam concrete material, so that the pore particle size and the pore volume are reduced, and the hydrophobicity and the impermeability of the concrete are improved; after the modified fibers are doped, the fibers are in a disordered distribution state, the fibers can adjust the uniformity degree in the concrete, so that the concrete keeps integrity in hardening, the distribution state of the materials is changed, the generation probability of cracks is reduced, and even if cracks occur, the fiber network can restrict the continuous expansion of the concrete; meanwhile, the polypropylene fiber has the advantages of soft texture, high monofilament tensile strength and the like, can play a good role in reinforcing ribs when added into the foam concrete, can improve the meshing capability inside the foam concrete, inhibits the generation and development of microcracks, and improves the crack resistance and the durability of the foam concrete.
(3) The alkali-activated recycled aggregate composite foam concrete for the roof panel, provided by the invention, solves the problems of poor volume stability, low strength and poor durability of the foam concrete, has the anti-permeability performance of a super-hydrophobic self-protection effect, and has important theoretical significance and engineering application value when being used for constructing a roof heat-insulation waterproof system.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The fly ash is purchased from Shijiazhuang Yuanjingjing products GmbH, and the mesh number is 325 meshes; the slag micro powder is purchased from Ning Bo mineral products, inc. in Lingshu county, and the mesh number is 325 meshes; the waste concrete is from waste concrete disassembled from a certain project of Bijian construction group Limited company in Zhejiang province; the volcanic ash is purchased from tourmaline mineral products, inc; the nano silicon dioxide is obtained from the resource industry Co., ltd of dragon of Dongguan and is German Gusai R972 hydrophobic nano silicon dioxide; the glass fiber is purchased from Taianshenyang composite materials, inc., the diameter of the fiber is 9-13 μm, and the length of the fiber is 3mm; the polypropylene fiber is purchased from Shijiazhu Yongchan chemical engineering Co., ltd, and the diameter of the fiber is 10-12mm; the polycarboxylic acid water reducing agent is purchased from Liaoning Colon Fine chemical industries, inc., and has the brand number of SP409; the sodium methylenedinaphthalene sulfonate is purchased from Shandong Xiang Sho New materials Co.
Example 1
A preparation method of alkali-activated recycled aggregate composite foam concrete for roof panels comprises the following steps:
weighing raw materials according to a formula, mixing and stirring 70 parts of modified recycled aggregate, 15 parts of alkali activator, 20 parts of 42.5 quick-hardening sulphoaluminate cement, 25 parts of fly ash, 20 parts of modified fiber, 20 parts of slag micropowder and 8 parts of polycarboxylic acid water reducer to prepare a uniform mixture, wherein the stirring speed is 350r/min; the alkali activator is prepared from the following components in a mass ratio of 1:4:3, mixing sodium hydroxide, calcium oxide and sodium silicate;
step two, stirring and mixing 8 parts of sodium lauroyl sarcosinate, 2 parts of hydroxypropyl methyl cellulose ether and 90 parts of water uniformly to obtain a foaming solution;
and step three, adding the foaming solution obtained in the step two into the mixture obtained in the step one, stirring until the mixture is uniformly mixed, then performing injection molding, and putting the mixture into a standard curing box for curing to obtain the alkali-activated recycled aggregate composite foam concrete for the roof panel.
The preparation method of the modified recycled aggregate comprises the following steps:
(1) Crushing the waste concrete and then sieving the crushed waste concrete with a 60-mesh sieve to obtain regenerated micro powder; adding 100g of regenerated micro powder into 300mL of 6% hydrochloric acid solution, soaking for 7h at room temperature, then adding into a ball milling tank, carrying out ball milling for 2h at the ball milling speed of 1500r/min, and filtering, washing and drying after the ball milling is finished to obtain pretreated regenerated micro powder;
(2) Adding 100g of the pretreated regenerated micro powder (100 g) in the step (1) into a ball milling tank, then adding 5g of gamma-mercaptopropyl-trimethoxysilane, carrying out ball milling at the ball milling speed of 2500r/min for 1h, adding 500mL of deionized water after the ball milling is finished, then adding 13g of volcanic ash and 15g of nano-silica, stirring at 70 ℃ for reaction for 3h, and filtering and drying after the reaction is finished to obtain modified regenerated micro powder;
(3) And (3) adding 100g of the modified regenerated micro powder (100 g) in the step (2) into 300mL of deionized water, then adding 3g of PVA and 6g of tridecafluorooctyltriethoxysilane, reacting for 3 hours at a constant temperature of 90 ℃, drying and crushing at 90 ℃ after the reaction is finished, and sieving by a 80-mesh sieve to obtain the modified regenerated aggregate.
The preparation method of the modified fiber comprises the following steps:
(a) Adding 30g of glass fiber and 15g of polypropylene fiber into 150mL of 8g/L potassium permanganate solution for soaking for 4 hours, filtering, washing and drying after soaking, and performing ball milling at the ball milling speed of 2000r/min for 1.5 hours to obtain mixed fiber;
(b) And (b) adding the mixed fiber (100 g) in the step (a) into 700mL of absolute ethyl alcohol, then adding 15g of stearic acid and 8g of isobutyl triethoxysilane, stirring and reacting for 4h at 70 ℃, and filtering, washing and drying after the reaction is finished to obtain the modified fiber.
Example 2
A preparation method of alkali-activated recycled aggregate composite foam concrete for roof panels comprises the following steps:
weighing raw materials according to a formula, mixing and stirring 70 parts of modified recycled aggregate, 15 parts of alkali activator, 15-25 parts of 52.5 ordinary portland cement, 25 parts of fly ash, 20 parts of modified fiber, 25 parts of slag micropowder and 8 parts of sodium methylene dinaphthalene sulfonate water reducer to prepare a uniform mixture, wherein the stirring speed is 350r/min; the alkali activator is prepared from the following components in a mass ratio of 1:4:2, sodium hydroxide, calcium oxide and sodium silicate;
step two, stirring and mixing 8 parts of sodium methallyl sulfonate, 1 part of trisodium phosphate and 80 parts of water uniformly to obtain a foaming solution;
and step three, adding the foaming solution obtained in the step two into the mixture obtained in the step one, stirring until the mixture is uniformly mixed, then performing injection molding, and putting the mixture into a standard curing box for curing to obtain the alkali-activated recycled aggregate composite foam concrete for the roof panel.
The preparation method of the modified recycled aggregate comprises the following steps:
(1) Crushing the waste concrete and then sieving the crushed waste concrete with a 60-mesh sieve to obtain regenerated micro powder; adding 100g of regenerated micro powder into 300mL of hydrochloric acid solution with the mass concentration of 5%, soaking for 8h at room temperature, then adding into a ball milling tank, carrying out ball milling for 2h at the ball milling speed of 1500r/min, and filtering, washing and drying after the ball milling is finished to obtain pretreated regenerated micro powder;
(2) Adding 100g of the pretreated regenerated micro powder (100 g) in the step (1) into a ball milling tank, adding 4g of gamma-mercaptopropyl-trimethoxysilane, carrying out ball milling at the ball milling speed of 2500r/min for 0.5h, adding the ball milled micro powder into 500mL of deionized water, adding 13g of volcanic ash and 15g of nano-silica, stirring and reacting at 70 ℃ for 3h, and filtering and drying the reaction product to obtain modified regenerated micro powder;
(3) And (3) adding 100g of the modified regenerated micro powder (100 g) in the step (2) into 300mL of deionized water, then adding 3g of PVA and 6g of tridecafluorooctyltriethoxysilane, reacting for 3 hours at a constant temperature of 95 ℃, drying and crushing at 90 ℃ after the reaction is finished, and sieving by a 80-mesh sieve to obtain the modified regenerated aggregate.
The preparation method of the modified fiber comprises the following steps:
(a) Adding 30g of glass fiber and 18g of polypropylene fiber into 150mL of 7g/L potassium permanganate solution for soaking for 4 hours, filtering, washing and drying after soaking, and performing ball milling at the ball milling speed of 2000r/min for 1 hour to obtain mixed fiber;
(b) And (b) adding the mixed fiber (100 g) in the step (a) into 700mL of absolute ethanol, then adding 18g of stearic acid and 7g of isobutyl triethoxysilane, stirring and reacting for 5 hours at 60 ℃, and filtering, washing and drying after the reaction is finished to obtain the modified fiber.
Example 3
A preparation method of alkali-activated recycled aggregate composite foam concrete for roof panels comprises the following steps:
weighing raw materials according to a formula, mixing and stirring 60 parts of modified recycled aggregate, 10 parts of alkali activator, 15 parts of 42.5 ordinary portland cement, 20 parts of fly ash, 10 parts of modified fiber, 10 parts of slag micropowder and 5 parts of sodium methylene dinaphthalene sulfonate water reducer to prepare a uniform mixture, wherein the stirring speed is 300r/min; the alkali activator is prepared from the following components in a mass ratio of 1:3:2, mixing sodium hydroxide, calcium oxide and sodium silicate;
step two, stirring and mixing 5 parts of hydrogen peroxide with the mass concentration of 30%, 0.5 part of calcium stearate and 70 parts of water uniformly to obtain a foaming solution;
and step three, adding the foaming solution obtained in the step two into the mixture obtained in the step one, stirring until the mixture is uniformly mixed, then performing injection molding, and putting the mixture into a standard curing box for curing to obtain the alkali-activated recycled aggregate composite foam concrete for the roof panel.
The preparation method of the modified recycled aggregate comprises the following steps:
(1) Crushing the waste concrete and then sieving the crushed waste concrete with a 60-mesh sieve to obtain regenerated micro powder; adding 100g of regenerated micro powder into 300mL of hydrochloric acid solution with the mass concentration of 4%, soaking for 10h at room temperature, then adding into a ball milling tank, carrying out ball milling for 3h at the ball milling speed of 1000r/min, and filtering, washing and drying after the ball milling is finished to obtain pretreated regenerated micro powder;
(2) Adding the pretreated regenerated micro powder (100 g) obtained in the step (1) into a ball milling tank, then adding 3g of gamma-mercaptopropyl-trimethoxysilane, carrying out ball milling at the ball milling speed of 2000r/min for 1h, adding the ball milled micro powder into 500mL of deionized water, then adding 10g of volcanic ash and 10g of nano-silica, stirring at 60 ℃ for reaction for 4h, and filtering and drying after the reaction is finished to obtain modified regenerated micro powder;
(3) And (3) adding 100g of the modified regenerated micro powder obtained in the step (2) into 300mL of deionized water, then adding 2g of PVA and 5g of tridecafluorooctyltriethoxysilane, reacting for 4 hours at a constant temperature of 80 ℃, drying and crushing at 90 ℃ after the reaction is finished, and sieving with an 80-mesh sieve to obtain the modified regenerated aggregate.
The preparation method of the modified fiber comprises the following steps:
(a) Adding 30g of glass fiber and 10g of polypropylene fiber into 150mL of 5g/L potassium permanganate solution for soaking for 5 hours, filtering, washing and drying after soaking, and carrying out ball milling for 2 hours at the ball milling speed of 1500r/min to obtain mixed fiber;
(b) And (b) adding the mixed fiber (100 g) in the step (a) into 700mL of absolute ethyl alcohol, then adding 10g of stearic acid and 5g of isobutyl triethoxysilane, stirring and reacting at 50 ℃ for 6h, and filtering, washing and drying after the reaction is finished to obtain the modified fiber.
Example 4
A preparation method of alkali-activated recycled aggregate composite foam concrete for roof panels comprises the following steps:
weighing raw materials according to a formula, mixing and stirring 80 parts of modified recycled aggregate, 20 parts of alkali activator, 25 parts of 42.5 quick-hardening sulphoaluminate cement, 30 parts of fly ash, 30 parts of modified fiber, 30 parts of slag micropowder and 10 parts of polycarboxylic acid water reducer to prepare a uniform mixture, wherein the stirring speed is 400r/min; the alkali activator is prepared from the following components in a mass ratio of 1:5:3, mixing sodium hydroxide, calcium oxide and sodium silicate;
step two, stirring and mixing 10 parts of sodium methallyl sulfonate, 3 parts of hydroxypropyl methyl cellulose ether and 100 parts of water uniformly to obtain a foaming solution;
and step three, adding the foaming solution obtained in the step two into the mixture obtained in the step one, stirring until the mixture is uniformly mixed, then performing injection molding, and putting the mixture into a standard curing box for curing to obtain the alkali-activated recycled aggregate composite foam concrete for the roof panel.
The preparation method of the modified recycled aggregate comprises the following steps:
(1) Crushing the waste concrete and then sieving the crushed waste concrete with a 60-mesh sieve to obtain regenerated micro powder; adding 100g of regenerated micro powder into 300mL of hydrochloric acid solution with the mass concentration of 7%, soaking for 10h at room temperature, then adding into a ball milling tank, carrying out ball milling for 1h at the ball milling speed of 2000r/min, and filtering, washing and drying after the ball milling is finished to obtain pretreated regenerated micro powder;
(2) Adding 100g of the pretreated regenerated micro powder (100 g) in the step (1) into a ball milling tank, then adding 6g of gamma-mercaptopropyl-trimethoxysilane, carrying out ball milling at the ball milling speed of 3000r/min for 0.5h, adding the ball milled micro powder into 500mL of deionized water, then adding 15g of volcanic ash and 20g of nano-silica, stirring and reacting at 80 ℃ for 2h, and filtering and drying the reaction product to obtain modified regenerated micro powder;
(3) And (3) adding 100g of the modified regenerated micro powder (100) in the step (2) into 300mL of deionized water, then adding 4g of PVA and 7g of tridecafluorooctyltriethoxysilane, reacting for 2 hours at a constant temperature of 100 ℃, drying and crushing at 90 ℃ after the reaction is finished, and sieving by a 80-mesh sieve to obtain the modified regenerated aggregate.
The preparation method of the modified fiber comprises the following steps:
(a) Adding 30g of glass fiber and 20g of polypropylene fiber into 150mL of 10g/L potassium permanganate solution for soaking for 3 hours, filtering, washing and drying after soaking is finished, and performing ball milling for 1 hour at the ball milling speed of 2500r/min to obtain mixed fiber;
(b) And (b) adding the mixed fiber (100 g) in the step (a) into 700mL of absolute ethyl alcohol, then adding 20g of stearic acid and 10g of isobutyl triethoxysilane, stirring and reacting at 80 ℃ for 3h, and filtering, washing and drying after the reaction is finished to obtain the modified fiber.
Comparative example 1
A preparation method of alkali-activated recycled aggregate composite foam concrete for roof panels comprises the following steps:
weighing raw materials according to a formula, mixing and stirring 70 parts of recycled aggregate, 15 parts of alkali activator, 20 parts of 42.5 quick-hardening sulphoaluminate cement, 25 parts of fly ash, 20 parts of modified fiber, 20 parts of slag micropowder and 8 parts of polycarboxylic acid water reducer to prepare a uniform mixture, wherein the stirring speed is 350r/min; the alkali activator is prepared from the following components in a mass ratio of 1:4:3, mixing sodium hydroxide, calcium oxide and sodium silicate;
step two, stirring and mixing 8 parts of sodium lauroyl sarcosinate, 2 parts of hydroxypropyl methyl cellulose ether and 90 parts of water uniformly to obtain a foaming solution;
and step three, adding the foaming solution obtained in the step two into the mixture obtained in the step one, stirring until the mixture is uniformly mixed, then performing injection molding, and putting the mixture into a standard curing box for curing to obtain the alkali-activated recycled aggregate composite foam concrete for the roof panel.
The preparation method of the recycled aggregate comprises the following steps:
crushing the waste concrete and then sieving the crushed waste concrete with a 60-mesh sieve to obtain regenerated micro powder; adding 100g of regenerated micro powder into 300mL of 6% hydrochloric acid solution, soaking for 7h at room temperature, then adding into a ball milling tank, carrying out ball milling for 2h at the ball milling speed of 1500r/min, and filtering, washing and drying after the ball milling is finished to obtain the regenerated aggregate.
The preparation method of the modified fiber comprises the following steps:
(a) Adding 30g of glass fiber and 15g of polypropylene fiber into 150mL of 8g/L potassium permanganate solution for soaking for 4 hours, filtering, washing and drying after the soaking is finished, and performing ball milling for 1.5 hours at the ball milling speed of 2000r/min to obtain mixed fiber;
(b) And (b) adding the mixed fiber (100 g) in the step (a) into 700mL of absolute ethanol, then adding 15g of stearic acid and 8g of isobutyl triethoxysilane, stirring and reacting for 4h at 70 ℃, and filtering, washing and drying after the reaction is finished to obtain the modified fiber.
Comparative example 2
A preparation method of alkali-activated recycled aggregate composite foam concrete for roof panels comprises the following steps:
weighing raw materials according to a formula, mixing and stirring 70 parts of modified recycled aggregate, 15 parts of alkali activator, 20 parts of 42.5 quick-hardening sulphoaluminate cement, 25 parts of fly ash, 20 parts of mixed fiber, 20 parts of slag micropowder and 8 parts of polycarboxylic acid water reducer to prepare a uniform mixture, wherein the stirring speed is 350r/min; the alkali activator is prepared from the following components in a mass ratio of 1:4:3, mixing sodium hydroxide, calcium oxide and sodium silicate;
step two, stirring and mixing 8 parts of sodium lauroyl sarcosinate, 2 parts of hydroxypropyl methyl cellulose ether and 90 parts of water uniformly to obtain a foaming solution;
and step three, adding the foaming solution obtained in the step two into the mixture obtained in the step one, stirring until the mixture is uniformly mixed, then performing injection molding, and putting the mixture into a standard curing box for curing to obtain the alkali-activated recycled aggregate composite foam concrete for the roof panel.
The preparation method of the modified recycled aggregate comprises the following steps:
(1) Crushing the waste concrete and then sieving the crushed waste concrete with a 60-mesh sieve to obtain regenerated micro powder; adding 100g of regenerated micro powder into 300mL of hydrochloric acid solution with the mass concentration of 6%, soaking for 7h at room temperature, then adding into a ball milling tank, carrying out ball milling for 2h at the ball milling speed of 1500r/min, and filtering, washing and drying after the ball milling is finished to obtain pretreated regenerated micro powder;
(2) Adding 100g of the pretreated regenerated micro powder (100 g) in the step (1) into a ball milling tank, then adding 5g of gamma-mercaptopropyl-trimethoxysilane, carrying out ball milling at the ball milling speed of 2500r/min for 1h, adding 500mL of deionized water after the ball milling is finished, then adding 13g of volcanic ash and 15g of nano-silica, stirring at 70 ℃ for reaction for 3h, and filtering and drying after the reaction is finished to obtain modified regenerated micro powder;
(3) And (3) adding 100g of the modified regenerated micro powder (100 g) in the step (2) into 300mL of deionized water, then adding 3g of PVA and 6g of tridecafluorooctyltriethoxysilane, reacting for 3 hours at a constant temperature of 90 ℃, drying and crushing at 90 ℃ after the reaction is finished, and sieving by a 80-mesh sieve to obtain the modified regenerated aggregate.
The preparation method of the mixed fiber comprises the following steps:
and adding 30g of glass fiber and 15g of polypropylene fiber into 150mL of 8g/L potassium permanganate solution for soaking for 4 hours, and filtering, washing and drying after the soaking is finished to obtain the mixed fiber.
Comparative example 3
A preparation method of alkali-activated recycled aggregate composite foam concrete for roof panels comprises the following steps:
weighing raw materials according to a formula, and mixing and stirring 70 parts of recycled aggregate, 15 parts of alkali activator, 20 parts of 42.5 quick-hardening sulphoaluminate cement, 25 parts of fly ash, 20 parts of mixed fiber, 20 parts of slag micropowder and 8 parts of polycarboxylic acid water reducer to prepare a uniform mixture, wherein the stirring speed is 350r/min; the alkali activator is prepared from the following components in a mass ratio of 1:4:3, mixing sodium hydroxide, calcium oxide and sodium silicate;
step two, stirring and mixing 8 parts of sodium lauroyl sarcosinate, 2 parts of hydroxypropyl methyl cellulose ether and 90 parts of water uniformly to obtain a foaming solution;
and step three, adding the foaming solution obtained in the step two into the mixture obtained in the step one, stirring until the mixture is uniformly mixed, then performing injection molding, and putting the mixture into a standard curing box for curing to obtain the alkali-activated recycled aggregate composite foam concrete for the roof panel.
The preparation method of the recycled aggregate comprises the following steps:
crushing the waste concrete and then sieving the crushed waste concrete with a 60-mesh sieve to obtain regenerated micro powder; adding 100g of regenerated micro powder into 300mL of 6% hydrochloric acid solution, soaking for 7h at room temperature, then adding into a ball milling tank, carrying out ball milling for 2h at the ball milling speed of 1500r/min, and filtering, washing and drying after the ball milling is finished to obtain the regenerated aggregate.
The preparation method of the mixed fiber comprises the following steps:
and adding 30g of glass fiber and 15g of polypropylene fiber into 150mL of 8g/L potassium permanganate solution for soaking for 4 hours, and filtering, washing and drying after the soaking is finished to obtain the mixed fiber.
The alkali-activated recycled aggregate composite foam concrete prepared in the examples 1-4 and the comparative examples 1-3 is subjected to performance tests, wherein the dry density, the compressive strength and the water absorption are tested according to the standard JG/T266-2011 foam concrete, and the compressive strength is 100mm multiplied by 100mm; the contact angle was measured using an optical contact angle measuring instrument (SL 200KS, solon, usa). The test results are given in table 1 below:
as can be seen from the above Table 1, the alkali-activated recycled aggregate composite foam concrete prepared in the embodiments 1 to 4 of the invention has good hydrophobic property, water absorption and mechanical property, and all the properties meet the corresponding requirements of the national specification JGT 266-2011 foam concrete. According to the invention, the recycled aggregate and the modified fiber are modified, after the modified recycled aggregate and the modified fiber are added, the fibers are distributed in a random manner in the foam concrete, the shrinkage capacity of a hydration product is dispersed on the fibers, the generation and development of micro cracks of the foam concrete are effectively inhibited, the strength is improved, and the doping of the fibers can reduce the breakage of the foam and improve the appearance of a pore channel, so that the density and the average pore diameter of the foam concrete are reduced, and the volume water absorption rate of the foam concrete is reduced; in the comparative example 1, the recycled aggregate is not modified, so that the mechanical property and the hydrophobic property of the recycled aggregate are obviously reduced; comparative example 2 does not modify the mixed fiber, resulting in a decrease in water absorption; comparative example 3 has not modified the recycled aggregate and the mixed fiber, and both the hydrophobic property and the water absorption rate are significantly reduced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The alkali-activated recycled aggregate composite foam concrete for the roof panel is characterized by comprising the following raw materials in parts by weight: 60-80 parts of modified recycled aggregate, 10-20 parts of alkali activator, 15-25 parts of cement, 5-10 parts of foaming agent, 20-30 parts of fly ash, 10-30 parts of modified fiber, 0.5-3 parts of foam stabilizer, 10-30 parts of slag micro powder, 70-100 parts of water and 5-10 parts of water reducer;
the preparation method of the modified recycled aggregate comprises the following steps:
(1) Crushing the waste concrete and then sieving the crushed waste concrete with a 60-mesh sieve to obtain regenerated micro powder; adding the regenerated micro powder into a hydrochloric acid solution, soaking, then adding into a ball milling tank, carrying out ball milling, and filtering, washing and drying after the ball milling is finished to obtain pretreated regenerated micro powder;
(2) Adding the pretreated regenerated micro powder in the step (1) into a ball milling tank, then adding gamma-mercaptopropyl-trimethoxysilane, carrying out ball milling, adding into deionized water after the ball milling is finished, then adding volcanic ash and nano-silica, carrying out stirring reaction, and filtering and drying after the reaction is finished to obtain modified regenerated micro powder;
(3) Adding the modified regenerated micro powder obtained in the step (2) into deionized water, then adding PVA and tridecafluorooctyltriethoxysilane, carrying out constant temperature reaction, drying and crushing after the reaction is finished, and sieving by a 80-mesh sieve to obtain the modified regenerated aggregate;
the preparation method of the modified fiber comprises the following steps:
(a) Adding glass fiber and polypropylene fiber into potassium permanganate solution for soaking, and filtering, washing, drying and ball-milling after soaking to obtain mixed fiber;
(b) And (b) adding the mixed fiber obtained in the step (a) into absolute ethyl alcohol, then adding stearic acid and isobutyl triethoxysilane, stirring for reaction, and filtering, washing and drying after the reaction is finished to obtain the modified fiber.
2. The alkali-activated recycled aggregate composite foam concrete for roof panels as claimed in claim 1, wherein the alkali activator comprises sodium hydroxide, calcium oxide and sodium silicate, and the mass ratio of sodium hydroxide, calcium oxide and sodium silicate is 1:3-5:2-3; the foaming agent is one or more of sodium lauroyl sarcosinate, hydrogen peroxide with the mass concentration of 30% and sodium methallyl sulfonate; the cement is one or more of 42.5 common Portland cement, 52.5 common Portland cement and 42.5 quick-hardening sulphoaluminate cement; the foam stabilizer is one or more of hydroxypropyl methyl cellulose ether, calcium stearate and trisodium phosphate; the water reducing agent is one of sodium methylene dinaphthalene sulfonate and polycarboxylic acid water reducing agent.
3. The alkali-activated recycled aggregate composite foam concrete for roof panels as claimed in claim 1, wherein the hydrochloric acid solution in the step (1) has a mass concentration of 4-7%, and the impregnation condition is that the impregnation is carried out at room temperature for 5-10h; the ball milling speed is 1000-2000r/min, and the time is 1-3h; pretreating the regenerated micro powder in the step (2): gamma-mercaptopropyl trimethoxysilane: volcanic ash: the mass ratio of the nano silicon dioxide is 100:3-6:10-15:10-20 parts of; the ball milling speed is 2000-3000r/min, and the ball milling time is 0.5-1h; the temperature of the stirring reaction is 60-80 ℃, and the time is 2-4h.
4. The alkali-activated recycled aggregate composite foam concrete for roof panels as claimed in claim 1, wherein the modified recycled micro powder in step (3): PVA: the mass ratio of the tridecafluorooctyltriethoxysilane is 100:2-4:5-7; the constant temperature reaction is carried out at 80-100 ℃ for 1-3h.
5. The alkali-activated recycled aggregate composite foamed concrete for roof panels as claimed in claim 1, wherein the concentration of the potassium permanganate solution in step (a) is 5-10g/L; the mass ratio of the glass fiber to the polypropylene fiber is 3:1-2; the ball milling speed is 1500-2500r/min, and the time is 1-2h.
6. The alkali-activated recycled aggregate composite foam concrete for roof panels as claimed in claim 1, wherein the mass ratio of the mixed fibers, the stearic acid and the isobutyltriethoxysilane in the step (b) is 100:10-20:5-10; the temperature of the stirring reaction is 50-80 ℃, and the reaction time is 3-6h.
7. A method of making an alkali activated recycled aggregate composite foam concrete for roof panels as claimed in any one of claims 1 to 6, comprising the steps of:
weighing raw materials according to a formula, mixing and stirring modified recycled aggregate, alkali activator, cement, fly ash, modified fiber, slag micropowder and water reducer to prepare a uniform mixture, wherein the stirring speed is 300-400 r/min;
step two, stirring and mixing the foaming agent, the foam stabilizer and water uniformly to obtain a foaming solution;
and step three, adding the foaming solution obtained in the step two into the mixture obtained in the step one, stirring until the mixture is uniformly mixed, then performing injection molding, and putting the mixture into a standard curing box for curing to obtain the alkali-activated recycled aggregate composite foam concrete for the roof panel.
8. Use of the alkali-activated recycled aggregate composite foam concrete for roof panels according to any one of claims 1 to 6 in roof panels.
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