CN114573315B - Autoclaved carbonization maintenance regenerated lightweight concrete and preparation method thereof - Google Patents

Autoclaved carbonization maintenance regenerated lightweight concrete and preparation method thereof Download PDF

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CN114573315B
CN114573315B CN202210219728.8A CN202210219728A CN114573315B CN 114573315 B CN114573315 B CN 114573315B CN 202210219728 A CN202210219728 A CN 202210219728A CN 114573315 B CN114573315 B CN 114573315B
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CN114573315A (en
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陈潇
张浩宇
汪昱凡
翁少雄
杨永楷
李北星
赵青林
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Wuhan University of Technology WUT
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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
    • C04B28/14—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
    • 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
    • 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
    • C04B20/10—Coating or impregnating
    • C04B20/1018—Coating or impregnating with organic materials
    • C04B20/1022—Non-macromolecular compounds
    • C04B20/1025—Fats; Fatty oils; Ester type waxes; Higher fatty acids; Derivatives thereof
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • C04B40/0277—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • 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
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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Abstract

The invention discloses a non-autoclaved carbonized curing regenerated lightweight concrete, which comprises the following components in parts by weight: 40-70 parts of brick-concrete reclaimed 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 reducer; adding 40-60 parts of water; wherein the gas-generating carbonization curing agent is compounded by using a gas-generating component, an early-strength curing component, a slow-release curing component, a foam stabilizing component and a gluing component as main raw materials. The recycled lightweight concrete can effectively realize the recycling of building solid wastes, simultaneously realize the rapid forming of the aerated concrete and the remarkable improvement of mechanical properties under the condition 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.

Description

Autoclaved carbonization maintenance regenerated lightweight concrete and preparation method thereof
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a autoclaved carbonization maintenance regenerated lightweight concrete and a preparation method thereof.
Background
Currently, the annual output of the world is about 160 hundred million tons, and the annual output of the country is up to 24 hundred million tons. The huge amount of construction waste is generally disposed in the traditional landfill and accumulation modes, not only occupies the land, but also causes serious pollution to the soil and the atmosphere. How to recycle the construction waste and recycle the construction waste is one of the ecological problems to be solved in the present day.
The aerated concrete is a porous silicate product prepared by taking siliceous materials and calcareous materials as main raw materials, adding proper amounts of regulating materials and gas generating agents, and carrying out processes of stirring, pouring, standing, cutting, curing and the like. The existing curing process of the aerated concrete mainly comprises three curing modes of natural curing, autoclaved curing (high temperature and high pressure) and carbon dioxide mineralization curing (normal temperature and high pressure). The carbon dioxide mineralization maintenance is mainly realized by accelerating the carbonation reaction of the cementing material and filling the pores in the product by using the generated carbonate, 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 the natural curing process, lower energy consumption than the autoclaved curing process and the like.
However, in order to promote the mineralization reaction to be sufficiently carried out, the carbon dioxide mineralization curing technology generally needs to further utilize high pressure conditions to make carbon dioxide gas fully contact with aerated concrete, such as: hu Shutao and the like, when researching the influence of carbon dioxide mineralization curing on solid waste lightweight concrete, the test block is required to be cured for 3 days under the natural curing condition, then put into a special carbon dioxide mineralization curing kettle, and cured for a period of time under the carbon dioxide curing pressure of 1MPa, so that the mineralization curing work of the test block can be completed. This clearly 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, it is necessary to develop an aerated concrete which can make full use of construction waste and can rapidly mold and improve mechanical properties at normal temperature and pressure.
Disclosure of Invention
Aiming at the problems and the defects existing in the prior art, the invention provides the autoclaved carbonization curing regenerated lightweight concrete, which can effectively realize the recycling of building solid waste, simultaneously realize the rapid molding of the aerated concrete under the condition of normal temperature and normal pressure and the remarkable improvement of the mechanical property, effectively shorten the curing time of the aerated concrete and reduce the curing energy consumption; has important economic and environmental benefits.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the autoclaved carbonization maintenance regenerated lightweight concrete comprises the following components in parts by weight: 40-70 parts of brick-concrete reclaimed 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 reducer; 40-60 parts of additional water (without water absorbed in the subsequent water-absorbing resin); wherein the gas-generating carbonization curing agent is compounded by using a gas-generating component, an early-strength curing component, a slow-release curing component, a foam stabilizing component and a gluing component as main raw materials.
Preferably, in the autoclaved-free carbonized curing regenerated lightweight concrete, the content of the aerated carbonized curing agent is 5-10 parts; can give consideration to both good light weight and high strength.
More preferably, in the autoclaved-free carbonized curing regenerated lightweight concrete, the content of the aerated carbonized curing agent is 8-10 parts; can effectively give consideration to good light weight and high strength performance.
In the scheme, the foaming carbonization curing agent comprises the following raw materials in parts by weight: 5-6 parts of a foaming component, 5-6 parts of an early-strength curing component, 5-6 parts of a slow-release curing component, 10-15 parts of an adhesive component and 10-15 parts of a foam stabilizing component.
In the above scheme, the preparation method of the gas-generating carbonization curing agent comprises the following steps:
1) Uniformly stirring and mixing the weighed gas generating component, the early-strength curing component, the slow-release curing component, the adhesive component and the foam stabilizing component;
2) Naturally airing the obtained mixture to obtain the gas-generating carbonization curing agent; by bonding the various functional components together, the simultaneous development of the various components (particularly the gas generating component and the early strength curing component) in the pores can be effectively promoted.
In the above scheme, the gas generating component is one or more of aluminum powder, aluminum paste, calcium carbide, sodium bicarbonate and the like.
In the scheme, the early-strength maintenance 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 gleditsia sinensis powder, sodium dodecyl benzene sulfonate or other foam stabilizing agents special for aerated concrete.
In the above scheme, the adhesive component can be selected from organic or inorganic substances which have adhesive property and do not react with other components, and specifically one or more of epoxy resin adhesive, phenolic resin adhesive, urea resin adhesive and the like can be selected.
In the scheme, the slow-release maintenance component is obtained by uniformly mixing yeast, the super absorbent resin and the binder, and fumigating by adopting beeswax.
In the above scheme, in the preparation process of the slow-release maintenance component, each raw material and the weight portion thereof comprise: 5-6 parts of yeast, 5-6 parts of super absorbent resin (the dosage 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 sodium polyacrylate or the like, and the water absorption multiple of the super absorbent resin is 100-150 times; the adhesive can be organic or inorganic substances which have adhesive property and do not react with other components, and can be one or more of epoxy resin adhesive, phenolic resin adhesive, urea resin adhesive and the like.
In the above scheme, the preparation method of the slow-release maintenance component specifically comprises the following steps:
1) Uniformly mixing the weighed yeast, the water-saturated super absorbent resin and the binder to obtain a mixture;
2) Adding beeswax into a heating container, heating to melt, placing the obtained mixture above the heating container, fumigating until the surface is completely coated with waxy layer to obtain the slow-release curing agent.
Preferably, the fumigation temperature is 180-230 ℃; the time is 1-5 h.
In the scheme, the brick-concrete reclaimed sand powder is obtained by crushing and grinding brick-concrete construction waste (without further sorting and separating the brick and the concrete) obtained by recycling the brick-concrete construction waste and mixing the concrete blocks in any proportion; the screen residue of 0.08mm is 5-25%.
In the above scheme, the water saturation treatment step of the super absorbent resin comprises the following steps: adding 100-150 times of water into the high water-absorbing resin, and soaking for 1-3 hours to enable the high water-absorbing resin to fully absorb water.
In the above scheme, the cement can be Portland cement, portland cement or volcanic ash Portland cement.
In the scheme, the water reducer can be selected from polycarboxylic acid water reducer, naphthalene water reducer and the like; the water reducing rate is 20-30%.
In the scheme, the quicklime is the medium-speed lime, the digestion time is 7-15min, and the digestion temperature is 60-90 ℃; the gypsum is desulfurization gypsum which is a desulfurization byproduct of a thermal power plant.
The preparation method of the autoclaved-free carbonization maintenance regenerated lightweight concrete comprises the following steps:
1) Weighing raw materials, wherein the raw materials comprise the following components in parts by weight: 40-70 parts of brick-concrete reclaimed 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 reducer and 40-60 parts of additional water;
2) Adding the weighed brick-concrete reclaimed 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 (3) injecting the obtained mixed slurry into a mould, standing for gas generation, cutting off a bread head, demoulding, and curing at room temperature to obtain the autoclaved carbonization curing regenerated lightweight concrete test piece.
In the above scheme, the stirring treatment step in the step 2) includes: firstly, stirring for 3-5 min at the speed of 100-200 r/min; stirring at the speed of 200-300 r/min for 1-3 min.
In the above scheme, the static stopping gas generating condition includes: the rest temperature is 45-55deg.C, and the rest time is 3-5h.
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 aerated carbonization curing agent adopted by the invention can lead aerated concrete to be carbonized and cured rapidly at normal temperature and normal pressure, thereby achieving the purposes of rapid molding and improving mechanical properties in a short time: the foaming carbonization curing agent consists of four parts of a traditional foaming agent, an early curing agent, a slow-release curing agent and a foam stabilizer, which are bonded together by an adhesive and then dried to obtain the foaming carbonization curing agent; 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 as to form pores in the aerated concrete, meanwhile, the early-stage curing component (sodium bicarbonate) starts to react to generate carbon dioxide, on one hand, the carbon dioxide can play a part in gas generation, on the other hand, the carbon dioxide can carry out carbonation reaction with the gel substances on the inner wall of the pores, and the generated carbonate can interpenetrate with the reacted gel substances, so that the early strength of the pore walls is rapidly provided, and the aim of rapid forming in a short time is fulfilled; after the aerated concrete is formed, the slow-release curing component begins to play a role; the slow-release maintenance component mainly takes a super absorbent resin sodium polyacrylate as a carrier, fixes yeast on the surface of the super absorbent resin sodium polyacrylate through an adhesive, fumigates the yeast on beeswax steam and forms a waxy layer outside the yeast; on the one hand, this layer wax coating can isolate external moisture, prevents that inside sodium polyacrylate from releasing water in advance, and on the other hand, wax coating can be as the nutrition source of microzyme, and when wax coating was degraded by microzyme gradually, will form the hole on the surface to make the carbon dioxide release that microzyme anaerobic breathe produced, play the carbonization maintenance effect of later stage, still can make the inside sodium polyacrylate of wax coating expose, thereby make its inside moisture release, exert its internal maintenance effect.
The strength of the aerated concrete mainly comes from the pore wall of the pore, and the aerated carbon curing agent adopted by the invention is prepared by bonding and compounding various functional components such as traditional aerated components, early curing components and the like; on one hand, the aerated concrete can be maintained from the static stop stage, and along with the thickening of the aerated concrete slurry, sodium bicarbonate and the like in the aerated carbonization maintenance agent can synchronously and continuously release carbon dioxide slowly so as to timely perform carbonation reaction with hydration products of the aerated concrete, and calcium carbonate is generated to fill pore structures on the pore walls, so that the early mechanical property of the aerated concrete is rapidly improved, and higher strength can be obtained when the static stop is finished. On the other hand, the gas-generating carbonization curing agent is favorable for generating carbon dioxide in most of air holes, and simultaneously promotes the carbon dioxide to uniformly contact with most of hole walls, so that the mineralization degree of the hole walls is uniform and consistent, the phenomenon of stress concentration 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 absorbent resin such as sodium polyacrylate can release the water absorbed by the high water absorbent resin in the later stage, so that the further hydration of the gelled substance is promoted, and the carbon dioxide released by the anaerobic respiration of the yeast is cooperated to generate the later-stage maintenance effect, so that the later-stage mechanical strength is further improved.
Compared with the prior art, the invention has the beneficial effects that:
1) The invention takes the brick-concrete reclaimed sand powder as the main raw material, further combines the composite gas-generating carbonization curing agent, effectively realizes the recycling of building solid waste, can realize the rapid molding of aerated concrete and the remarkable improvement of mechanical property under the normal-temperature and normal-pressure curing condition, and can provide a new idea for the preparation of high-performance aerated concrete;
2) The preparation method is simple, wide in raw material sources and low in cost, and can effectively shorten the curing time of the aerated concrete and reduce the curing energy consumption; has remarkable environmental and economic benefits.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the following examples, the brick-concrete reclaimed sand powder is obtained by collecting brick-concrete construction waste (wherein the mass ratio of bricks to concrete is about 7:3) from a certain construction site, manually removing impurities in the brick-concrete reclaimed sand powder, crushing the brick-concrete construction waste by a jaw crusher, and grinding the brick-concrete reclaimed sand powder by a ball mill; the 0.08mm screen residue is 13.5%.
The cement adopted is ordinary Portland cement, and the 28d strength is 45.6MPa.
The water reducer is polycarboxylic acid high-efficiency water reducer, and the water reducing rate is 25%.
The adopted sodium polyacrylate is a super absorbent resin, white powdery solid, and the water absorption multiple is 100 times; the water saturation treatment is carried out before use, and the specific steps comprise: adding 100 times of water into the sodium polyacrylate salt, and soaking for 3 hours to enable the sodium polyacrylate salt to fully absorb water.
The adhesive is epoxy resin adhesive.
The quicklime is middle-speed lime, the digestion time is 10min, and the digestion temperature is 68 ℃; the gypsum is desulfurization gypsum which is a desulfurization byproduct of a thermal power plant.
Example 1
The preparation method of the autoclaved carbonization maintenance regenerated lightweight concrete comprises the following steps:
1) Weighing raw materials; the raw materials and the parts by weight thereof are as follows: 60 parts of brick-concrete reclaimed sand powder (the weight parts are the same and are not repeated), 20 parts of cement, 15 parts of quicklime, 5 parts of gypsum, 1 part of gas-generating carbonization curing agent, 1 part of water reducer and 50 parts of water;
the preparation method of the gas-generating carbonization curing agent comprises the following steps: adding 5 parts of yeast, sodium polyacrylate after water saturation treatment (wherein the content of the sodium polyacrylate 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 200 ℃, placing the mixture above the crucible, turning over once every half hour, and fumigating for 3h at 200 ℃ 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 a gas-generating carbonization curing agent;
2) Adding the weighed brick-concrete reclaimed sand powder, cement, quicklime, gypsum, gas-generating carbonization curing agent, water reducing agent and water into a stirrer, stirring for 5min at a rotating speed of 150r/min, and stirring for 3min at a rotating speed of 250r/min to obtain mixed slurry;
3) And (3) injecting the obtained mixed slurry into a mould, standing still and stopping gas emission for 5 hours at the temperature of 45 ℃, cutting off the surface packet head, demoulding, and curing for 2d at room temperature to obtain the autoclaved carbonization curing regenerated lightweight concrete test piece.
The concrete test pieces obtained in this example had dimensions of 100 mm. Times.100 mm and a dry density of 523kg/m 3 The strength after static stopping of the gas generation is 1.0MPa, and the compressive strength after 2d curing is 2.5MPa.
Example 2
The preparation method of the autoclaved carbonization maintenance regenerated lightweight concrete comprises the following steps:
1) Weighing raw materials; the raw materials and the parts by weight thereof are as follows: 60 parts of brick-concrete reclaimed sand powder, 20 parts of cement, 15 parts of quicklime, 5 parts of gypsum, 5 parts of gas-generating carbonization curing agent, 1 part of water reducer and 50 parts of water;
the preparation method of the gas-generating carbonization curing agent comprises the following steps: adding 6 parts of yeast, sodium polyacrylate after water saturation treatment (wherein the content of the sodium polyacrylate 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 200 ℃, placing the mixture above the crucible, turning over once every half hour, and fumigating for 3h at 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 the gas-generating carbonization curing agent;
2) Adding the weighed brick-concrete reclaimed sand powder, cement, quicklime, gypsum, gas-generating carbonization curing agent, water reducing agent and water into a stirrer, stirring for 5min at a rotating speed of 150r/min, and stirring for 3min at a rotating speed of 250r/min to obtain mixed slurry;
3) And (3) injecting the mixed slurry into a mould, standing still and stopping gas emission for 5 hours at the temperature of 45 ℃, cutting off the surface packet head, demoulding, and curing for 2d at room temperature to obtain the autoclaved carbonization curing regenerated lightweight concrete test piece.
The concrete test pieces obtained in this example had dimensions of 100 mm. Times.100 mm and a dry density of 493kg/m 3 The strength after static stopping of the gas generation is 1.3MPa, and the compressive strength after 2d curing is 3.2MPa.
Example 3
The preparation method of the autoclaved carbonization maintenance regenerated lightweight concrete comprises the following steps:
1) Weighing raw materials; the raw materials and the parts by weight thereof are as follows: 60 parts of brick-concrete reclaimed 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 reducer and 50 parts of water;
the preparation method of the gas-generating carbonization curing agent comprises the following steps: adding 5 parts of yeast, sodium polyacrylate after water saturation treatment (wherein the content of the sodium polyacrylate 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 200 ℃, placing the mixture above the crucible, turning over once every half hour, and fumigating for 3h at 200 ℃ to obtain a slow-release curing agent; adding 5 parts of aluminum powder, 5 parts of sodium bicarbonate, 5 parts of slow-release curing components, 10 parts of adhesive and 10 parts of foam stabilizing components into a stirrer, stirring for 30min, and drying at room temperature for 24h to obtain a gas-generating carbonization curing agent;
2) Adding the weighed brick-concrete reclaimed sand powder, cement, quicklime, gypsum, gas-generating carbonization curing agent, water reducing agent and water into a stirrer, stirring for 5min at a rotating speed of 150r/min, and stirring for 3min at a rotating speed of 250r/min to obtain mixed slurry;
3) And (3) injecting the mixed slurry into a mould, standing still and stopping gas emission for 5 hours at the temperature of 45 ℃, cutting off the surface packet head, demoulding, and curing for 2d at room temperature to obtain the autoclaved carbonization curing regenerated lightweight concrete test piece.
The concrete test pieces obtained in this example had dimensions of 100 mm. Times.100 mm and a dry density of 480kg/m 3 The strength after static stopping and gas generating is 1.8MPa, and the compressive strength after 2d curing is 3.3MPa; can effectively give consideration to good light weight and high strength performance.
Comparative example 1
The aerated concrete was prepared in the same manner as in example 1, except that no aerated carbonization curing agent was added and 1 part of aluminum paste was used for aeration; and meanwhile, different curing modes (test piece A, test piece B and test piece C) are adopted for curing.
Test piece a: curing for 28 days under the natural curing condition.
Test piece B: curing for 8h at 190 ℃ and 1.1MPa at high temperature and high pressure.
Test piece C: curing for 3d under natural curing conditions, and curing for 2h under the carbon dioxide curing pressure of 1 MPa.
The dimensions of the concrete test pieces obtained in this comparative example were 100 mm. Times.100 mm, 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
Figure BDA0003536466840000061
Figure BDA0003536466840000071
Comparative example 2
The preparation method of the aerated concrete is almost the same as that of the embodiment 3, except that the raw materials and the parts by weight thereof are as follows: 60 parts of brick-concrete reclaimed sand powder, 20 parts of cement, 15 parts of quicklime, 5 parts of gypsum, 2 parts of aluminum powder paste, 2 parts of sodium bicarbonate, 1 part of water reducer and 50 parts of water.
The concrete test pieces obtained in this comparative example had dimensions of 100 mm. Times.100 mm and a dry density of 520kg/m 3 The strength after stopping the gas generation is 0.9MPa, and the compressive strength after curing for 2 days is 2.0MPa. As can be seen by comparing the comparative example with the example 3, the air-entraining component aluminum powder paste and the early-strength curing component sodium bicarbonate are directly mixed with other raw materials and added into a concrete system, so that the air-entraining component aluminum powder paste and the early-strength curing component sodium bicarbonate are not beneficial to ensuring that the air-entraining component aluminum powder paste and the early-strength curing component sodium bicarbonate synchronously play a modifying role in the early stage of concrete, and the strength of the air-entraining component aluminum powder paste and the early-strength curing component sodium bicarbonate after curing for 2 days are low.
The results show that the aerated concrete obtained by the invention can realize the recycling of construction waste, simultaneously can rapidly form and improve the mechanical properties of the aerated concrete in a short time, and can effectively give consideration to good light weight and high strength properties; 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 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 provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.

Claims (7)

1. The autoclaved carbonization maintenance regenerated lightweight concrete is characterized by comprising the following components in parts by weight: 40-70 parts of brick-concrete reclaimed 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 reducer; adding 40-60 parts of water; wherein the gas-generating carbonization curing agent is compounded by using a gas-generating component, an early-strength curing component, a slow-release curing component, a foam stabilizing component and a gluing component as main raw materials;
the foaming carbonization curing agent comprises the following raw materials in parts by weight: 5-6 parts of a gas generating component, 5-6 parts of an early-strength curing component, 5-6 parts of a slow-release curing component, 10-15 parts of an adhesive component and 10-15 parts of a foam stabilizing component;
the slow-release maintenance component is obtained by uniformly mixing yeast, super absorbent resin and a binder, and fumigating by adopting beeswax;
in the preparation process of the slow-release maintenance component, the slow-release maintenance component comprises the following raw materials in parts by weight: 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.
2. The autoclaved-free carbonized curing recycled lightweight concrete as recited in claim 1, wherein the preparation method of the aerated carbonized curing agent comprises the following steps:
1) Uniformly stirring and mixing the weighed gas generating component, the early-strength curing component, the slow-release curing component, the adhesive component and the foam stabilizing component;
2) Naturally airing the obtained mixture to obtain the gas-generating carbonization curing agent.
3. The autoclaved-free carbonized curing recycled lightweight concrete according to claim 1, wherein the gas generating component is one or more of aluminum powder, aluminum paste, calcium carbide and sodium bicarbonate; the early-strength maintenance component is one or more of sodium bicarbonate, potassium bicarbonate and calcium bicarbonate; the foam stabilizing component is gleditsia sinensis powder or sodium dodecyl benzene sulfonate.
4. The autoclaved-free carbonized curing recycled lightweight concrete according to 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 super absorbent resin and the binder to obtain a mixture;
2) And adding beeswax into a heating container, heating and melting, and placing the obtained mixture above the heating container for fumigation to obtain the slow-release curing agent.
5. The autoclaved-free carbonized curing recycled lightweight concrete according to claim 1, wherein the brick-concrete recycled sand powder is obtained by crushing and grinding brick-concrete construction waste recovered from brick-concrete construction waste; the screen residue of 0.08mm is 5-25%.
6. The method for preparing the autoclaved-free carbonized cured regenerated lightweight concrete according to any one of claims 1 to 5, which is characterized by comprising the following steps:
1) Weighing raw materials, wherein the raw materials comprise the following components in parts by weight: 40-70 parts of brick-concrete reclaimed 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 reducer and 40-60 parts of additional water;
2) Adding the weighed brick-concrete reclaimed 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 (3) injecting the obtained mixed slurry into a mould, standing for gas generation, cutting off a bread head, demoulding, and curing at room temperature to obtain the autoclaved carbonization curing regenerated lightweight concrete test piece.
7. The method of claim 6, wherein the resting gas generating conditions comprise: the rest temperature is 45-55 ℃, and the rest time is 3-5h; the curing temperature is room temperature, and the curing time is 1-2 d.
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