CN114573315A - Non-autoclaved carbonization curing recycled light concrete and preparation method thereof - Google Patents
Non-autoclaved carbonization curing recycled light concrete and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
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- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
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- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
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- C04B40/0277—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element
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- 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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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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Abstract
The invention discloses a non-autoclaved carbonization curing regenerative light concrete, which comprises the following components in parts by weight: 40-70 parts of brick-concrete regenerated sand powder, 5-20 parts of cement, 5-20 parts of quicklime, 2-6 parts of gypsum, 1-15 parts of gas-generating carbonization curing agent and 1-3 parts of water reducing agent; adding 40-60 parts of water to the outside; the gas-generating carbonization curing agent is compounded by main raw materials of a gas-generating component, an early-strength curing component, a slow-release curing component, a foam stabilizing component and an adhesive component. The recycled lightweight concrete can effectively realize resource utilization of building solid wastes, simultaneously realize rapid molding and remarkable improvement of mechanical properties of the aerated concrete under the conditions of normal temperature and normal pressure, effectively shorten the curing time of the aerated concrete and reduce the energy consumption for curing; has important economic and environmental benefits.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to non-autoclaved carbonization curing recycled light concrete and a preparation method thereof.
Background
At present, the annual production of construction waste in the world is about 160 hundred million tons, wherein the annual production of construction waste in China is up to 24 hundred million tons. The huge amount of construction waste is usually disposed by adopting the traditional modes of landfill, accumulation and the like, not only occupies the land, but also causes serious pollution to the soil and the atmosphere. How to recycle and utilize construction waste as resources is one of the ecological problems to be solved urgently today.
The aerated concrete is a porous silicate product prepared by taking a siliceous material and a calcareous material as main raw materials, adding a proper amount of regulating material and gas former, and carrying out processes of stirring, pouring, standing, cutting, maintaining and the like. At present, the maintenance process of the aerated concrete mainly comprises three maintenance modes, namely natural maintenance, autoclaved maintenance (high temperature and high pressure), carbon dioxide mineralized maintenance (normal temperature and high pressure) and the like. The carbon dioxide mineralization curing is mainly used for accelerating the carbonation reaction of the cementing material, and the generated carbonate is used for filling the pores in the product, so that the performance of the concrete product can be improved in a short time. The technology can be carried out at normal temperature, and has the advantages of shorter time than a natural curing process, lower energy consumption than an autoclaved curing process and the like.
However, in order to promote the mineralization reaction to be sufficiently performed, the carbon dioxide mineralization curing technology generally needs to further utilize high pressure conditions to make the carbon dioxide gas sufficiently contact with the aerated concrete, such as: during research on the influence of carbon dioxide mineralization curing on solid waste lightweight concrete, for example, moutao et al, a test block needs to be cured for 3 days under natural curing conditions, then placed in a special carbon dioxide mineralization curing kettle, and cured for a period of time under the carbon dioxide curing pressure of 1MPa, so that mineralization curing work of the test block can be completed. This undoubtedly greatly increases the complexity of the curing process, increases the production cost, and restricts the popularization and development of the carbon dioxide mineralization curing technology. Therefore, there is a need to develop an aerated concrete that can make full use of construction waste and can be rapidly formed and improve mechanical properties at normal temperature and pressure.
Disclosure of Invention
The invention mainly aims to solve the problems and the defects in the prior art, provide the non-autoclaved carbonization curing recycled light concrete, effectively realize the resource utilization of the solid waste of the building, simultaneously realize the rapid forming and the obvious improvement of the mechanical property of the aerated concrete under the conditions of normal temperature and normal pressure, effectively shorten the curing time of the aerated concrete and reduce the curing energy consumption; has important economic and environmental benefits.
In order to realize the purpose, the invention adopts the technical scheme that:
the non-autoclaved carbonization curing recycled light concrete comprises the following components in parts by mass: 40-70 parts of brick-concrete regenerated sand powder, 5-20 parts of cement, 5-20 parts of quicklime, 2-6 parts of gypsum, 1-15 parts of gas-generating carbonization curing agent and 1-3 parts of water reducing agent; 40-60 parts of water (not containing water absorbed in subsequent water-absorbent resin) is added externally; the gas-generating carbonization curing agent is compounded by main raw materials of a gas-generating component, an early-strength curing component, a slow-release curing component, a foam stabilizing component and an adhesive component.
Preferably, the content of the gas-generating carbonization curing agent in the non-autoclaved carbonization curing regenerated light concrete is 5-10 parts; can give consideration to good light weight and high strength performance.
More preferably, the content of the gas-generating carbonization curing agent in the non-autoclaved carbonization curing regenerated light concrete is 8-10 parts; can effectively give consideration to good light weight and high strength performance.
In the scheme, the gas-generating carbonized curing agent comprises the following raw materials in parts by weight: 5-6 parts of gas generating component, 5-6 parts of early strength curing component, 5-6 parts of slow release curing component, 10-15 parts of adhesive component and 10-15 parts of foam stabilizing component.
In the scheme, the preparation method of the gas-generating carbonized curing agent comprises the following steps:
1) uniformly stirring and mixing the weighed gas generating component, early-strength curing component, slow-release curing component, adhesive component and foam stabilizing component;
2) naturally airing the obtained mixture to obtain the gas-forming carbonization curing agent; by bonding a plurality of functional components together, the improvement effect of the plurality of components (especially the gas generating component and the early strength curing component) in the air holes can be effectively promoted to be synchronously played.
In the scheme, the gas generating component is one or more of aluminum powder, aluminum powder paste, calcium carbide, sodium bicarbonate and the like.
In the scheme, the early strength curing component can be one or more of sodium bicarbonate, potassium bicarbonate, calcium bicarbonate and the like.
In the scheme, the foam stabilizing component can be selected from gleditschia horrida powder, sodium dodecyl benzene sulfonate or other special foam stabilizers for aerated concrete and the like.
In the scheme, the adhesive component can be organic or inorganic substances which have adhesive property and do not react with other components, and specifically can be one or more of epoxy resin adhesive, phenolic resin adhesive, urea resin adhesive and the like.
In the scheme, the slow-release curing component is obtained by uniformly mixing yeast, super absorbent resin and a binder and fumigating by adopting beeswax.
In the scheme, in the preparation process of the slow-release maintenance component, the raw materials and the weight parts of the raw materials comprise: 5-6 parts of yeast, 5-6 parts of super absorbent resin (the amount before water absorption), 10-12 parts of binder and 20-30 parts of beeswax; wherein the super absorbent resin is subjected to water saturation treatment before use.
In the scheme, the super absorbent resin can be selected from polyacrylic acid sodium salt and the like, and the water absorption multiple is 100-150 times; the adopted binder can be organic or inorganic substances which have adhesive property and do not react with other components, and specifically can be one or more of epoxy resin adhesive, phenolic resin adhesive, urea-formaldehyde resin adhesive and the like.
In the above scheme, the preparation method of the slow-release curing component specifically comprises the following steps:
1) uniformly mixing the weighed yeast, the water-saturated resin and the binder to obtain a mixture;
2) adding beeswax into a heating container, heating and melting, putting the obtained mixture above the heating container for fumigation until the surface of the mixture is completely wrapped by a wax layer to obtain the slow-release curing agent.
Preferably, the fumigating temperature is 180-230 ℃; the time is 1-5 h.
In the scheme, the brick-concrete recycled sand powder is obtained by crushing and grinding brick-concrete construction waste (without further sorting and separating bricks and concrete) in which bricks and concrete blocks which are recovered from the brick-concrete construction waste are mixed in any proportion; the 0.08mm screen residue is 5-25%.
In the above scheme, the water saturation treatment step of the super absorbent resin comprises: adding water with the mass of 150 times of 100-.
In the above scheme, the cement may be portland cement, ordinary portland cement, or pozzolana portland cement.
In the scheme, the water reducing agent can be a polycarboxylic acid water reducing agent or a naphthalene water reducing agent and the like; the water reducing rate is 20-30%.
In the scheme, quick lime is adopted as medium-speed lime, the digestion time is 7-15min, and the digestion temperature is 60-90 ℃; the gypsum is desulfurized gypsum which is a desulfurization byproduct of the thermal power plant.
The preparation method of the non-autoclaved carbonization curing recycled light concrete comprises the following steps:
1) weighing raw materials, wherein the raw materials and the weight parts of the raw materials comprise: 40-70 parts of brick-concrete regenerated sand powder, 5-20 parts of cement, 5-20 parts of quicklime, 2-6 parts of gypsum, 1-15 parts of gas-generating carbonization curing agent, 1-3 parts of water reducing agent and 40-60 parts of external water;
2) adding the weighed brick-concrete regenerated sand powder, cement, quicklime, gypsum, gas-generating carbonization curing agent, water reducer and water into a stirrer, and stirring to obtain mixed slurry;
3) and injecting the obtained mixed slurry into a mold, standing for gas generation, cutting off bread, demolding, and maintaining at room temperature to obtain the autoclaved carbonization-free cured and regenerated lightweight concrete test piece.
In the above scheme, the stirring step in step 2) includes: firstly, stirring at a speed of 100-200 r/min for 3-5 min; then stirring at a speed of 200-300 r/min for 1-3 min.
In the above scheme, the resting gas-forming conditions include: the standing temperature is 45-55 deg.C, and the standing time is 3-5 h.
In the scheme, the curing temperature is room temperature, and the curing time is 1-2 d.
The principle of the invention is as follows:
the gas-forming carbonization curing agent adopted by the invention can quickly carry out carbonization curing on the aerated concrete at normal temperature and normal pressure, and achieves the purposes of quickly forming and improving the mechanical property in a short time: the gas-forming carbonization curing agent consists of four parts, namely a traditional gas-forming agent, an early-stage curing agent, a slow-release curing agent and a foam stabilizer, and is obtained by bonding together through an adhesive and then airing; after the gas-generating carbonization curing agent is contacted with water, the traditional gas-generating component firstly reacts with the water to generate gas, so that pores are formed in the aerated concrete, meanwhile, the early-stage curing component (sodium bicarbonate) starts to react to generate carbon dioxide, on one hand, a part of gas-generating effect can be achieved, on the other hand, the carbon dioxide can perform carbonation reaction with gelled substances on the inner wall of the pores, and the generated carbonate can be mutually interpenetrated with the reacted gelled substances, so that the early strength of the pore wall is rapidly provided, and the purpose of short-time rapid forming is achieved; after the aerated concrete is formed, the slow-release curing component starts to play a role; the slow-release maintenance component mainly takes a super absorbent resin sodium polyacrylate as a carrier, yeast is fixed on the surface of the carrier through an adhesive, and then the yeast is fumigated on beeswax steam to form a waxy layer outside; on the one hand, the waxy layer can isolate external moisture to prevent the internal sodium polyacrylate from releasing water in advance, and on the other hand, the waxy layer can be used as a nutrient source of the yeast, and when the waxy layer is gradually degraded by the yeast, holes can be formed on the surface of the waxy layer, so that carbon dioxide generated by anaerobic respiration of the yeast is released, the carbonization and maintenance effects at the later stage are achieved, the internal sodium polyacrylate of the waxy layer is exposed, the internal moisture is released, and the internal maintenance effect is achieved.
The strength of the aerated concrete mainly comes from the hole walls of air holes, and the gas-forming carbonization curing agent adopted by the invention bonds and compounds various functional components such as traditional gas-forming components, early-stage curing components and the like; on one hand, the aerated concrete can be cured from a static stop stage, and along with thickening of aerated concrete slurry, sodium bicarbonate and the like in the gas-generating carbonization curing agent can synchronously and continuously release carbon dioxide slowly so as to generate carbonation reaction with hydration products of the aerated concrete in time and generate calcium carbonate to fill a pore structure on a pore wall, so that the early mechanical property of the aerated concrete is rapidly improved, and the aerated concrete can obtain higher strength after the static stop. On the other hand, the gas-generating carbonization curing agent adopted by the invention is beneficial to generating carbon dioxide in most of air holes, and simultaneously promotes the carbon dioxide to be in uniform contact with most of hole walls, so that the mineralization degrees of the hole walls are uniform and consistent, the stress concentration phenomenon caused by different mineralization degrees is avoided, and the mechanical property of the obtained concrete test piece is further ensured. In addition, the introduced high-water-absorptivity resin such as sodium polyacrylate and the like can release water absorbed by the high-water-absorptivity resin at a later stage, so that the further hydration of a gelled substance is promoted, and the later-stage mechanical strength is further improved by the maintenance effect of carbon dioxide released by anaerobic respiration of yeast at the later stage.
Compared with the prior art, the invention has the beneficial effects that:
1) the brick-concrete reclaimed sand powder is used as a main raw material, and is further combined with the compound gas-generating carbonization curing agent, so that the resource utilization of the solid waste of the building is effectively realized, the rapid forming and the remarkable improvement of the mechanical property of the aerated concrete under the normal-temperature and normal-pressure curing condition can be realized simultaneously, and a new thought can be provided for the preparation of the high-performance aerated concrete;
2) the preparation method provided by the invention is simple, wide in raw material source and low in cost, and can effectively shorten the curing time of the aerated concrete and reduce the curing energy consumption; has obvious environmental and economic benefits.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
In the following embodiments, the brick-concrete reclaimed sand powder is obtained by manually removing impurities in brick-concrete construction waste (wherein the mass ratio of bricks to concrete is about 7:3) collected from a certain construction site, crushing the brick-concrete construction waste by using a jaw crusher, and grinding the brick-concrete construction waste by using a ball mill; the 0.08mm screen residue is 13.5 percent.
The adopted cement is ordinary portland cement, and the 28d strength of the cement is 45.6 MPa.
The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is 25%.
The adopted sodium polyacrylate is a high water absorption resin, is a white powdery solid and has the water absorption multiple of 100 times; the water saturation treatment is carried out before use, and the specific steps comprise: adding 100 times of water into sodium polyacrylate, and soaking for 3h to fully absorb water.
The adopted adhesive is epoxy resin adhesive.
Quick lime is adopted as medium-speed lime, the digestion time is 10min, and the digestion temperature is 68 ℃; the gypsum is desulfurized gypsum which is a desulfurization byproduct of the thermal power plant.
Example 1
The preparation method of the non-autoclaved carbonized curing recycled lightweight concrete comprises the following steps:
1) weighing raw materials; the raw materials and the weight portions thereof are as follows: 60 parts of brick-concrete regenerated sand powder (weight parts, the same below, which is not described again), 20 parts of cement, 15 parts of quicklime, 5 parts of gypsum, 1 part of gas-generating carbonization curing agent, 1 part of water reducing agent and 50 parts of water;
the preparation method of the gas-generating carbonized curing agent comprises the following steps: adding 5 parts of yeast, the sodium polyacrylate salt subjected to water saturation treatment (wherein the content of the sodium polyacrylate salt is 5 parts) and 10 parts of adhesive into a stirrer, and stirring for 30min to obtain a mixture; pouring 20 parts of beeswax into a crucible, heating and melting for 5min at the temperature of 200 ℃, placing the mixture above the crucible, turning over once every half hour, and fumigating at 200 ℃ for 3h to obtain a slow-release curing agent; then adding 5 parts of aluminum powder, 5 parts of sodium bicarbonate, 5 parts of slow-release curing component, 10 parts of adhesive and 10 parts of foam stabilizing component into a stirrer, stirring for 30min, and drying at room temperature for 24h to obtain the gas-forming carbonization curing agent;
2) adding the weighed brick-concrete regenerated sand powder, cement, quicklime, gypsum, gas-generating carbonized curing agent, water reducer and water into a stirrer, stirring for 5min at the rotating speed of 150r/min, and then stirring for 3min at the rotating speed of 250r/min to obtain mixed slurry;
3) and injecting the obtained mixed slurry into a mold, standing and aerating for 5 hours in an environment of 45 ℃, cutting off bread heads, demolding, and curing for 2 days at room temperature to obtain the non-autoclaved carbonized cured regenerated light concrete test piece.
The concrete specimen obtained in this example had dimensions of 100mm X100 mm and a dry density of 523kg/m3The strength after standing and gas generation is 1.0MPa, and the compressive strength after curing for 2 days is 2.5 MPa.
Example 2
The preparation method of the non-autoclaved carbonized curing recycled lightweight concrete comprises the following steps:
1) weighing raw materials; the raw materials and the weight portions thereof are as follows: 60 parts of brick-concrete regenerated sand powder, 20 parts of cement, 15 parts of quick lime, 5 parts of gypsum, 5 parts of gas-generating carbonization curing agent, 1 part of water reducing agent and 50 parts of water;
the preparation method of the gas-generating carbonized curing agent comprises the following steps: adding 6 parts of yeast, the sodium polyacrylate salt subjected to water saturation treatment (wherein the content of the sodium polyacrylate salt is 6 parts) and 12 parts of adhesive into a stirrer, and stirring for 30min to obtain a mixture; pouring 20 parts of beeswax into a crucible, heating and melting for 5min at the temperature of 200 ℃, placing the mixture above the crucible, turning over once every half hour, and fumigating for 3h at the temperature of 200 ℃ to obtain a slow-release curing agent; adding 6 parts of aluminum powder, 6 parts of sodium bicarbonate, 6 parts of slow-release curing agent, 12 parts of adhesive and 12 parts of foam stabilizer into a stirrer, stirring for 30min, and drying at room temperature for 24h to obtain a gas-forming carbonized curing agent;
2) adding the weighed brick-concrete regenerated sand powder, cement, quicklime, gypsum, gas-generating carbonized curing agent, water reducer and water into a stirrer, stirring for 5min at the rotating speed of 150r/min, and then stirring for 3min at the rotating speed of 250r/min to obtain mixed slurry;
3) and (3) injecting the mixed slurry into a mold, standing and aerating for 5 hours in an environment of 45 ℃, cutting off bread heads, demolding, and maintaining for 2 days at room temperature to obtain the non-autoclaved carbonization-maintenance regenerated light concrete test piece.
The concrete test pieces obtained in this example had dimensions of 100mm × 100mm × 100mm and a dry density of 493kg/m3The strength after standing and gas evolution is 1.3MPa, and the compressive strength after curing for 2 days is 3.2 MPa.
Example 3
The preparation method of the non-autoclaved carbonized curing recycled lightweight concrete comprises the following steps:
1) weighing raw materials; the raw materials and the weight portions thereof are as follows: 60 parts of brick-concrete regenerated sand powder, 20 parts of cement, 15 parts of quicklime, 5 parts of gypsum, 10 parts of gas-generating carbonization curing agent, 1 part of water reducing agent and 50 parts of water;
the preparation method of the gas-generating carbonized curing agent comprises the following steps: adding 5 parts of yeast, the sodium polyacrylate salt subjected to water saturation treatment (wherein the content of the sodium polyacrylate salt is 5 parts) and 10 parts of adhesive into a stirrer, and stirring for 30min to obtain a mixture; pouring 20 parts of beeswax into a crucible, heating and melting for 5min at the temperature of 200 ℃, placing the mixture above the crucible, turning over once every half hour, and fumigating at 200 ℃ for 3h to obtain a slow-release curing agent; adding 5 parts of aluminum powder, 5 parts of sodium bicarbonate, 5 parts of slow-release curing component, 10 parts of adhesive and 10 parts of foam stabilizing component into a stirrer, stirring for 30min, and drying at room temperature for 24h to obtain a gas-forming carbonized curing agent;
2) adding the weighed brick-concrete regenerated sand powder, cement, quicklime, gypsum, gas-generating carbonized curing agent, water reducer and water into a stirrer, stirring for 5min at the rotating speed of 150r/min, and then stirring for 3min at the rotating speed of 250r/min to obtain mixed slurry;
3) and (3) injecting the mixed slurry into a mold, standing and aerating for 5 hours in an environment of 45 ℃, cutting off bread heads, demolding, and maintaining for 2 days at room temperature to obtain the non-autoclaved carbonization-maintenance regenerated light concrete test piece.
The concrete test pieces obtained in this example had dimensions of 100mm X100 mm and a dry density of 480kg/m3The strength after standing and gas generation is 1.8MPa, and the compressive strength after curing for 2d is 3.3 MPa; can effectively give consideration to good light weight and high strength performance.
Comparative example 1
An aerated concrete was prepared in substantially the same manner as in example 1, except that a gassing carbonization curing agent was not added, and 1 part of an aluminum paste was used for gassing; and meanwhile, curing by adopting different curing modes (a test piece A, a test piece B and a test piece C).
Test piece a: and maintaining for 28d under natural maintenance conditions.
And a test piece B: curing at 190 ℃ and 1.1MPa for 8 h.
Test piece C: curing for 3d under natural curing conditions, and curing for 2h under the carbon dioxide curing pressure of 1 MPa.
The concrete test pieces obtained in this comparative example were 100mm × 100mm × 100mm in size, and the results of the performance test are shown in the following table.
Table 1 comparative example 1 results of performance test of concrete test pieces obtained under different curing conditions
Comparative example 2
The preparation method of the aerated concrete is substantially the same as that of the aerated concrete in the embodiment 3, and the difference is that the aerated concrete comprises the following raw materials in parts by weight: 60 parts of brick-concrete regenerated sand powder, 20 parts of cement, 15 parts of quick lime, 5 parts of gypsum, 2 parts of aluminum powder paste, 2 parts of sodium bicarbonate, 1 part of water reducing agent and 50 parts of water.
The concrete test pieces obtained in the comparative example had dimensions of 100mm × 100mm × 100mm and a dry density of 520kg/m3The strength after standing and gas generation is 0.9MPa, and the compressive strength after curing for 2 days is 2.0 MPa. Comparing the comparative example with example 3, it can be seen that the gas-forming component aluminum powder paste and the early strength curing component sodium bicarbonate are directly mixed with other raw materials and added into the concrete system, which is not beneficial to ensuring that the gas-forming component aluminum powder paste and the early strength curing component sodium bicarbonate can synchronously exert the modification effect in the early stage of the concrete, and the obtained aerated concrete has lower strength after standing and gas forming and lower compressive strength after curing for 2 days.
The result shows that the aerated concrete provided by the invention can be quickly molded and the mechanical property of the aerated concrete can be improved in a short time while the resource utilization of the construction waste is realized, and the good light weight and high strength performance can be effectively considered; compared with the traditional high-temperature high-pressure maintenance mode, the energy consumption can be obviously reduced, and the safety is stronger; compared with the traditional natural curing mode and the carbon dioxide curing mode, the curing time is shorter, and the mechanical property can be further improved; has wider prospect in the development of the field of wall materials.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The non-autoclaved carbonization curing recycled light concrete is characterized by comprising the following components in parts by mass: 40-70 parts of brick-concrete regenerated sand powder, 5-20 parts of cement, 5-20 parts of quicklime, 2-6 parts of gypsum, 1-15 parts of gas-generating carbonization curing agent and 1-3 parts of water reducing agent; adding 40-60 parts of water to the outside; the gas-generating carbonization curing agent is compounded by main raw materials of a gas-generating component, an early-strength curing component, a slow-release curing component, a foam stabilizing component and an adhesive component.
2. The non-autoclaved carbonization curing regeneration light concrete as claimed in claim 1, wherein the gas-generating carbonization curing agent comprises the following raw materials in parts by weight: 5-6 parts of gas generating component, 5-6 parts of early strength curing component, 5-6 parts of slow release curing component, 10-15 parts of adhesive component and 10-15 parts of foam stabilizing component.
3. The autoclaved carbonization-curing recycled light concrete as claimed in claim 1, wherein the preparation method of the gas-generating carbonization curing agent comprises the following steps:
1) uniformly stirring and mixing the weighed gas forming component, the early strength curing component, the slow-release curing component, the adhesive component and the foam stabilizing component;
2) and naturally airing the obtained mixture to obtain the gas-forming carbonization curing agent.
4. The non-autoclaved carbonization curing recycled light concrete as claimed in claim 1, wherein the gas generating component is one or more of aluminum powder, aluminum powder paste, calcium carbide and sodium bicarbonate; the early strength curing component is one or more of sodium bicarbonate, potassium bicarbonate and calcium bicarbonate; the foam stabilizing component is gleditschia horrida powder or sodium dodecyl benzene sulfonate.
5. The non-autoclaved carbonization curing recycled light concrete as claimed in claim 1, wherein the slow-release curing component is obtained by uniformly mixing yeast, super absorbent resin and binder, and then fumigating with beeswax.
6. The non-autoclaved carbonization curing recycled light concrete as claimed in claim 5, wherein in the preparation process of the slow-release curing component, the raw materials and the weight portions thereof comprise: 5-6 parts of yeast, 5-6 parts of super absorbent resin, 10-12 parts of binder and 20-30 parts of beeswax; wherein the super absorbent resin is subjected to water saturation treatment before use.
7. The non-autoclaved carbonization curing recycled light concrete as claimed in claim 1, wherein the preparation method of the slow release curing component specifically comprises the following steps:
1) uniformly mixing the weighed yeast, the water-saturated resin and the binder to obtain a mixture;
2) adding beeswax into a heating container, heating to melt, and fumigating the mixture above the heating container to obtain the slow-release curing agent.
8. The autoclaved, carbonized and cured recycled light concrete as claimed in claim 1, wherein said brick-concrete recycled sand powder is obtained by crushing and pulverizing brick-concrete construction waste recovered from brick-concrete construction waste; the 0.08mm screen residue is 5-25%.
9. The preparation method of the autoclaved carbonization-curing-free recycled lightweight concrete as claimed in any one of claims 1 to 8, characterized by comprising the following steps:
1) weighing raw materials, wherein the raw materials and the weight parts of the raw materials comprise: 40-70 parts of brick-concrete reclaimed sand powder, 5-20 parts of cement, 5-20 parts of quick lime, 2-6 parts of gypsum, 1-15 parts of gas-generating carbonization curing agent, 1-3 parts of water reducing agent and 40-60 parts of external water;
2) adding the weighed brick-concrete regenerated sand powder, cement, quicklime, gypsum, gas-generating carbonization curing agent, water reducer and water into a stirrer, and stirring to obtain mixed slurry;
3) and injecting the obtained mixed slurry into a mold, standing for gas generation, cutting off bread, demolding, and maintaining at room temperature to obtain the autoclaved carbonization-free cured and regenerated lightweight concrete test piece.
10. The method of claim 9, wherein the static gas-evolving conditions comprise: standing at 45-55 deg.C for 3-5 h; the curing temperature is room temperature, and the curing time is 1-2 d.
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| CN114573315B (en) | 2023-04-28 |
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