CN111484286B - Method for preparing heat-preservation sound-insulation building material by recycling stone powder and waste cotton - Google Patents

Method for preparing heat-preservation sound-insulation building material by recycling stone powder and waste cotton Download PDF

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CN111484286B
CN111484286B CN202010293989.5A CN202010293989A CN111484286B CN 111484286 B CN111484286 B CN 111484286B CN 202010293989 A CN202010293989 A CN 202010293989A CN 111484286 B CN111484286 B CN 111484286B
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waste cotton
sound
heat
stone powder
recycling
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CN111484286A (en
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王军强
黄勇
王艳
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Hefei Jiuzhou Longteng Scientific And Technological Achievement Transformation Co ltd
Sichuan Chuangshi Zhongcheng Construction Engineering Co ltd
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Jiangsu Institute of Architectural Technology
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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
    • C04B28/04—Portland cements
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/12—Waste materials; Refuse from quarries, mining or the like
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/18—Waste materials; Refuse organic
    • C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
    • C04B18/248—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork from specific plants, e.g. hemp fibres
    • 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
    • C04B2111/52—Sound-insulating materials
    • 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
    • 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
    • C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
    • C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses a method for preparing a heat-preservation sound-insulation building material by recycling stone powder and waste cotton, which comprises the following steps: 1) mixing the raw materials in a dry manner; 2) carrying out aerial fog stirring on the raw materials; 3) testing the material performance; 4) molding a mold; 5) and (5) curing and aging. The heat-insulating and sound-insulating building material provided by the invention realizes the recycling of waste cotton and stone powder, and the manufactured building material has better mechanical property, thermal property and sound-insulating property, meets the requirements of heat-insulating and sound-insulating functions of building light boards or building blocks, has better energy-saving and environmental benefits, meets the development requirements of energy-saving, environment-friendly, low-cost and light building materials, and provides a channel and a feasible scheme for the recycling of the waste cotton.

Description

Method for preparing heat-preservation sound-insulation building material by recycling stone powder and waste cotton
Technical Field
The invention relates to a method for preparing a heat-preservation sound-insulation building material by recycling stone powder and waste cotton, belonging to the technical field of building materials.
Background
During the processing and production of cotton, cotton linter residue or secondary waste is generated, and most of the waste cotton is discarded in a refuse landfill, a waste pit or an open area at present, so that serious pollution is caused. Thus, a long-standing problem faced by the cotton ginning and textile industries is how to treat the waste cotton produced.
Lime and limestone are used as building materials in large quantities and are also important raw materials for many industries, and waste limestone not less than 20% is generated in mining and using processes, and the waste is discarded in landfills, waste pits or open areas, which causes problems of dust, environmental pollution, etc., such as air pollution in spring and summer storms, causing serious health hazards, especially asthma. The related research reports are less about the recycling of waste cotton and waste limestone in the civil engineering industry.
The fly ash, the limestone powder and the like belong to industrial solid waste materials, composite materials such as waste cotton and waste limestone powder in natural forms are used as fine aggregates, the heat preservation and sound insulation performance of the composite materials is optimized and improved, a novel building composite material which is economical, light, environment-friendly, heat preservation and sound insulation is manufactured, the utilization efficiency of solid waste resources is improved, and the composite material has positive significance for developing circular economy, building resource-saving and environment-friendly society.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for preparing a heat-preservation sound-insulation building material by recycling stone powder and waste cotton.
In order to achieve the purpose, the method for preparing the heat-preservation and sound-insulation building material by recycling the stone powder and the waste cotton comprises the following steps:
1) dry mixing of raw materials: according to the weight parts, 1 part of cement, 4.5-7.5 parts of stone powder, 0.15-0.25 part of admixture, 0.005-0.015 part of high-efficiency water reducing agent and 10-30% of regenerated waste cotton with cement volume substitution rate are uniformly mixed, put into a concrete mixer and stirred until the regenerated waste cotton is uniformly dispersed in the mixture;
2) raw material aerial fog stirring: when the stirrer is used for stirring, 0.45-0.55 part of water is sprayed on the mixture by an air pump, and the mixture is continuously stirred and mixed for not less than 3 min;
3) and (3) testing the material performance: testing the performance of the uniformly mixed mixture to meet the requirement;
4) molding a mold: manufacturing a mould according to the designed size, and extruding and forming the mixture in the mould in a pressing-in mode;
5) curing and curing: and curing the formed product at room temperature for 24h, curing in a curing tank for 28d, putting saturated lime water into the curing tank, and drying the cured product in a 105 ℃ ventilation furnace for 24h to obtain the heat-insulating and sound-insulating building material.
As an improvement, the strength grade of the cement in the step 1) is 42.5MPa, and the specific surface area is 2200-2(g), the 200 mu m sieve residue is 0.35 percent, the initial setting time is 160min and the final setting time is 260min and 130-.
As an improvement, the regenerated waste cotton is prepared by the following method:
firstly, weighing 100kg of waste cotton, adding 4kg of NaOH solution with the concentration of 85-95%, NaCl solution with the concentration of 5-10% and Na with the concentration of 1-5%2CO3Soaking waste cotton in the mixed solution at 5-30 deg.C for not less than 24 hr;
filtering and washing the soaked waste cotton by using 85-95% NaOH solution, controlling the temperature of the NaOH solution to rise from 40 ℃ to 90 ℃ within 30min, and then preserving the heat at 90-95 ℃ for 30min-40 min;
thirdly, washing the filtered waste cotton with hot water of 30-40 ℃;
drying to obtain the regenerated waste cotton with the fiber length of 50-300 mu m and the pH value of 8-9.
As an improvement, NaOH solution, NaCl solution and Na in the step (I)2CO3The volume ratio of the solution was 16:3: 1.
As an improvement, the limestone powder is limestone powder, the content of calcium carbonate is more than or equal to 75 percent, the 28d activity index is more than or equal to 60 percent, and the fineness is less than or equal to 15 percent.
As an improvement, the admixture adopts granulated blast furnace slag powder with the volume weight of 2300-2400kg/m3The specific surface area is 350-370m2The activity index of/kg, 28d is more than or equal to 75 percent, and the water demand ratio is less than or equal to 115 percent.
As an improvement, the high-efficiency water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is 25-30%.
As a modification, the product formed in the step 5) is a plate or a building block.
Compared with the prior art, the heat-preservation and sound-insulation building material provided by the invention realizes the recycling of waste cotton and stone powder, has better mechanical property, thermal property and sound insulation property, meets the requirements of heat-preservation and sound insulation functions of light building boards or building blocks, has better energy-saving and environmental benefits, meets the development requirements of energy-saving, environment-friendly, low-cost and light building materials, and provides a channel and a feasible scheme for the recycling of the waste cotton.
Drawings
FIG. 1 shows the regenerated waste cotton obtained in example 1 of the present invention, (a) is a conventional waste cotton, and (b) is regenerated waste cotton;
FIG. 2 shows the air sound insulation improvement of the thermal insulation and sound insulation building block prepared in the embodiment 1 of the invention; in the graph, the delta R represents the sound insulation improvement amount of air sound, the index reflects the degree of the optimized improvement of the sound insulation amount of the wall body, and the index has important significance on the sound insulation of the wall body (mantissas respectively correspond to weight counting and the frequency spectrum correction amount of traffic noise);
FIG. 3 is a weighted sound insulation amount of the heat preservation and sound insulation building block prepared in the embodiment 1 of the invention, Rw is a single-value rating value of the weighted sound insulation amount, and the larger the index is, the better the sound insulation performance of the reaction wall body is at the frequency spectrum of 50-3150 Hz; in the figure, WB-190 is 190mm thick of the material of the invention, WC-260 is 260mm thick of concrete, WB-240 is 240mm thick of the material of the invention, and LB-200 is 200mm thick of the light material.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention.
A method for preparing heat-preservation and sound-insulation building materials by recycling stone powder and waste cotton comprises the following steps:
1) dry mixing of raw materials: according to the weight portion, 1 portion of cement, 4.5 to 7.5 portions of stone powder, 0.15 to 0.25 portion of admixture, 0.005 to 0.015 portion of high-efficiency water reducing agent and 10 to 30 percent of cement volume substitution rate (the volume weight of the waste cotton is lower relative to other materials, the amount of the waste cotton is configured and arranged by adopting the volume method substitution rate and is easier to control, the 10 to 30 percent of volume substitution rate selected by the invention is equivalent to 8.5 to 26 percent of the mass of the cement) are uniformly mixed, put into a concrete mixer and stirred until the regenerated waste cotton is uniformly dispersed in the mixture;
2) raw material aerial fog stirring: when the stirrer is used for stirring, 0.45-0.55 part of water is sprayed on the mixture by an air pump, and the mixture is continuously stirred and mixed for not less than 3 min;
3) and (3) testing the material performance: testing the performance of the uniformly mixed mixture to meet the requirement;
4) molding a mold: manufacturing a mould according to the designed size, and extruding and forming the mixture in the mould in a pressing-in mode;
5) curing and curing: and curing the formed product at room temperature for 24h, curing in a curing tank for 28d, putting saturated lime water into the curing tank, and drying the cured product in a 105 ℃ ventilation furnace for 24h to obtain the heat-insulating and sound-insulating building material.
As an improvement, the strength grade of the cement in the step 1) is 42.5MPa, and the specific surface area is2200-2300cm2(g), the 200 mu m sieve residue is 0.35 percent, the initial setting time is 160min and the final setting time is 260min and 130-.
As an improvement, the regenerated waste cotton is prepared by the following method:
firstly, weighing 100kg of waste cotton, adding 4kg of NaOH solution with the concentration of 85-95%, NaCl solution with the concentration of 5-10% and Na with the concentration of 1-5%2CO3The waste cotton is soaked in the mixed solution at the temperature of 5-30 ℃ for not less than 24 hours, the soaking treatment of the waste cotton is favorable for the bonding of the waste cotton with a cementing material and an aggregate, the aggregation and agglomeration of waste cotton fibers are avoided, the waste cotton fibers are favorably and uniformly dispersed in slurry, the dispersion and bridging action of the waste cotton fibers can be improved, and the heat and sound insulation effect of the waste cotton fibers is improved;
filtering and washing the soaked waste cotton by using 85-95% NaOH solution, controlling the temperature of the NaOH solution to rise from 40 ℃ to 90 ℃ within 30min, and then preserving the heat at 90-95 ℃ for 30min-40 min;
thirdly, washing the filtered waste cotton with hot water of 30-40 ℃;
drying to obtain the regenerated waste cotton with the fiber length of 50-300 mu m and the pH value of 8-9.
As an improvement, NaOH solution, NaCl solution and Na in the step (I)2CO3The volume ratio of the solution was 16:3: 1.
As an improvement, the limestone powder is limestone powder, the content of calcium carbonate is more than or equal to 75 percent, the 28d activity index is more than or equal to 60 percent, and the fineness is less than or equal to 15 percent.
As an improvement, the admixture adopts granulated blast furnace slag powder with the volume weight of 2300-2400kg/m3The specific surface area is 350-370m2The activity index of/kg, 28d is more than or equal to 75 percent, and the water demand ratio is less than or equal to 115 percent.
As an improvement, the high-efficiency water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is 25-30%.
As a modification, the product formed in the step 5) is a plate or a building block.
The mechanical, thermal and acoustic performance tests of the heat-preservation and sound-insulation building material of the invention are as follows:
28d compression strength of 5.3-11.2MPa and bending strength of 1.73-3.46MPa, volume weight 1270-3The mass water absorption rate is 9.6-18.5%, the heat conductivity coefficient is 0.231-0.268W/m.k, the air sound and sound insulation performance of the plate with the thickness of 120mm reaches 45.7-47.3dB, and the air sound and sound insulation performance of the plate with the thickness of 190mm reaches 51.3-53.6 dB.
Example 1
A heat-preservation sound-insulation building material comprises the following raw materials in parts by weight: 1 part of cement, 0.176 part of regenerated waste cotton with the volume substitution rate of 15 percent of cement, 4.83 parts of stone powder, 0.15 part of admixture, 0.5 part of water and 0.008 part of high-efficiency water reducing agent;
wherein the cement is ordinary Portland cement, the strength grade is 42.5MPa, and the specific surface area is 2250cm2The volume of the sieve is 0.35 percent of the volume of 200 mu m, the initial setting time is 153min, the final setting time is 245min, and the stability is qualified;
the regenerated waste cotton is prepared by the following method:
firstly, 100kg of waste cotton (as shown in figure 1 (a)) is weighed, and 4kg of NaOH solution with the concentration of 90%, NaCl solution with the concentration of 7% and Na solution with the concentration of 3% are added2CO3The solution is mixed according to the volume ratio of 16:3:1, soaking the waste cotton in the mixed solution at the temperature of 25 ℃ for 26 hours;
filtering and washing the treated waste cotton by using a 90% NaOH solution, controlling the temperature of the NaOH solution to rise from 40 ℃ to 90 ℃ within 30min, and then preserving the heat at 90 ℃ for 30 min;
flushing the filtered waste cotton with hot water of 30 ℃;
and fourthly, drying to obtain the regenerated waste cotton with the fiber length of 50 to 300 mu m and the pH value of 8.5 (shown in figure 1 (b)).
Wherein the stone powder is limestone powder, the calcium carbonate content is 79 percent, the 28d activity index is 62 percent, and the fineness is 15 percent;
the admixture adopts granulated blast furnace slag powder with the volume weight of 2350kg/m3The specific surface area is 360m2The activity index of the mixture is 78 percent per kg at 28d, and the water demand ratio is 110 percent;
the high-efficiency water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is 25-30%;
a method for preparing heat-insulating and sound-insulating building materials by recycling stone powder and waste cotton comprises the following steps;
1) dry mixing of raw materials: uniformly mixing cement, regenerated waste cotton, stone powder, an admixture and a high-efficiency water reducing agent according to the formula ratio, putting the mixture into a concrete mixer, and stirring until the regenerated waste cotton is uniformly dispersed in the mixture;
2) raw material aerial fog stirring: in order to obtain a more uniform mixture, when the stirrer is used for stirring, water is sprayed onto the mixture by an air pump, and the mixture is continuously stirred and mixed for 5 min;
3) and (3) testing the material performance: mixing the uniform mixture, sampling to prepare a test piece, testing the physical, mechanical, thermal and acoustic properties of the test piece, and preparing the building insulation block by using the test piece after the design requirements are met;
4) building block manufacturing: manufacturing a mould according to the designed size, adopting a pressing-in mode to extrude and form the mixture in the mould, and keeping the pressure for 3 min;
5) curing and curing: and curing the formed building block at room temperature for 24h, curing in a curing tank for 28d, putting saturated lime water into the curing tank, and drying the cured building block in a 105 ℃ ventilation furnace for 24h to obtain the heat-preservation sound-insulation building block.
The mechanical property, thermal engineering and acoustic parameter tests of the heat-preservation and sound-insulation building block prepared in the embodiment 1 are as follows:
28d compressive strength of 10.3MPa, bending strength of 3.21MPa and volume weight of 1630kg/m3The mass water absorption rate is 13.4 percent, the heat conductivity coefficient is 0.252W/m.k, the air sound insulation performance of the building block with the thickness of 120mm reaches 45.2dB, and the air sound insulation performance of the building block with the thickness of 190mm reaches 50.1 dB. The double-sided plastering is adopted, the material has stable appearance size and convenient processing and manufacturing, the thermal and sound insulation performance of the 190mm thick building block reaches the index requirement of green building performance, and the heat preservation and sound insulation effect is good.
In addition, the performance of the thermal insulation and sound insulation block prepared in example 1 is compared with the performance of materials such as clay bricks and concrete walls, and the following table 1 and fig. 2 to 3 show in detail.
Table 1 properties of the insulation and sound insulation block obtained in example 1
Figure BDA0002451493400000061
As can be seen from an analysis table 1, the sound insulation quantity of the double-sided plastering wall body with the thickness of 190mm manufactured by the method is greatly improved compared with the sound insulation quantity of light building blocks, hollow bricks and light boards, the air sound insulation improvement quantity reaches 13-20dB, the sound insulation performance index of the double-sided plastering wall body meets the high sound insulation quantity requirement of high-requirement houses and green buildings, and the sound insulation index requirement of the 3A house performance is met.
In addition, as can be seen from fig. 2 to 3, compared with a light building block, a hollow building block or a light plate wall, the sound insulation performance index of the wall is greatly improved. The sound insulation performance index of the wall with the thickness of 190mm can meet the high index requirement of the sound insulation performance of buildings.
In the confirmation of green building performance, the test point adopts novel environment-friendly materials and recycled solid waste materials, so that the green and friendly sustainable development is realized, the building blocks in the test point sample house are made of the building blocks of the invention, and the sizes of the building blocks are 240 multiplied by 115 multiplied by 90mm and 180 multiplied by 90 mm.
Example 2
A heat-preservation sound-insulation building material comprises the following raw materials in parts by weight: 1 part of cement, 0.258 part of regenerated waste cotton with the volume substitution rate of 21 percent of cement, 6.39 parts of stone powder, 0.20 part of admixture, 0.49 part of water and 0.012 part of high-efficiency water reducing agent;
wherein the cement is ordinary Portland cement, the strength grade is 42.5MPa, and the specific surface area is 2250cm2The volume of the sieve is 0.35 percent of the volume of 200 mu m, the initial setting time is 153min, the final setting time is 245min, and the stability is qualified;
the regenerated waste cotton is prepared by the following method:
firstly, weighing 100kg of waste cotton, adding 4kg of NaOH solution with the concentration of 90%, NaCl solution with the concentration of 7% and Na with the concentration of 3%2CO3The solution is mixed according to the volume ratio of 16:3:1, soaking the waste cotton in the mixed solution at the temperature of 20 ℃ for 30 hours;
filtering and washing the treated waste cotton by using a 90% NaOH solution, controlling the temperature of the NaOH solution to rise from 40 ℃ to 90 ℃ within 30min, and then preserving the temperature for 40min at 90 ℃;
thirdly, washing the filtered waste cotton with hot water of 40 ℃;
drying to obtain the regenerated waste cotton with the fiber length of 50-300 mu m and the pH value of 8.5.
The limestone powder is limestone powder, the calcium carbonate content is 79 percent, the 28d activity index is 62 percent, and the fineness is 15 percent;
the admixture adopts granulated blast furnace slag powder with the volume weight of 2350kg/m3The specific surface area is 360m2The activity index of the mixture is 78 percent per kg at 28d, and the water demand ratio is 110 percent;
the high-efficiency water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is 25-30%;
a method for preparing heat-insulating and sound-insulating building materials by recycling stone powder and waste cotton comprises the following steps;
1) dry mixing of raw materials: uniformly mixing cement, regenerated waste cotton, stone powder, an admixture and a high-efficiency water reducing agent according to the formula ratio, putting the mixture into a concrete mixer, and stirring until the regenerated waste cotton is uniformly dispersed in the mixture;
2) raw material aerial fog stirring: in order to obtain a more uniform mixture, water is sprayed onto the mixture by an air pump when the stirrer stirs, and the mixture is continuously stirred and mixed for 4 min;
3) and (3) testing the material performance: mixing the uniform mixture, sampling to prepare a test piece, testing the physical, mechanical, thermal and acoustic properties of the test piece, and preparing the building insulation block by using the test piece after the design requirements are met;
4) building block manufacturing: manufacturing a mould according to the designed size, adopting a pressing-in mode to extrude and form the mixture in the mould, and keeping the pressure for 4 min;
5) curing and curing: and curing the formed building block at room temperature for 24h, curing in a curing tank for 28d, putting saturated lime water into the curing tank, and drying the cured building block in a 105 ℃ ventilation furnace for 24h to obtain the heat-preservation sound-insulation building block.
The mechanical property, thermal engineering and acoustic parameter tests of the heat-preservation and sound-insulation building block prepared in the embodiment 2 are as follows:
the 28d compressive strength is 6.85MPa, the bending strength is 2.31MPa, the volume weight is 1570kg/m3, the mass water absorption rate is 15.1 percent, the heat conductivity coefficient is 0.238W/m.k, and the air sound and sound insulation performance of a wall body with the thickness of 200mm reaches 52.3 dB. The double-sided plastering is adopted, the material has stable appearance size and convenient processing and manufacturing, the thermal and sound insulation performance of the 190mm thick wall body reaches the index requirement of green building performance, and the heat preservation and sound insulation effect is good.
In the green building performance determination, the test point adopts novel environment-friendly materials and recycled solid waste materials, so that the green and friendly sustainable development is realized, the building blocks in the test point sample house are made of the materials of the invention, and the sizes of the building blocks are 390 multiplied by 190 multiplied by 140mm and 190 multiplied by 140 mm.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (7)

1. A method for preparing heat-preservation and sound-insulation building materials by recycling stone powder and waste cotton is characterized by comprising the following steps:
1) dry mixing of raw materials: according to the weight parts, 1 part of cement, 4.5-7.5 parts of stone powder, 0.15-0.25 part of admixture, 0.005-0.015 part of high-efficiency water reducing agent and 10-30% of regenerated waste cotton with cement volume substitution rate are uniformly mixed, put into a concrete mixer and stirred until the regenerated waste cotton is uniformly dispersed in the mixture;
the regenerated waste cotton is prepared by the following method:
firstly, weighing 100kg of waste cotton, adding 4kg of NaOH solution with the concentration of 85-95%, NaCl solution with the concentration of 5-10% and Na with the concentration of 1-5%2CO3Soaking waste cotton in the mixed solution at 5-30 deg.C for not less than 24 hr;
filtering and washing the soaked waste cotton by using 85-95% NaOH solution, controlling the temperature of the NaOH solution to rise from 40 ℃ to 90 ℃ within 30min, and then preserving the heat at 90-95 ℃ for 30min-40 min;
thirdly, washing the filtered waste cotton with hot water of 30-40 ℃;
drying to obtain regenerated waste cotton with fiber length of 50-300 microns and pH value of 8-9;
2) raw material aerial fog stirring: when the stirrer is used for stirring, 0.45-0.55 part of water is sprayed on the mixture by an air pump, and the mixture is continuously stirred and mixed for not less than 3 min;
3) and (3) testing the material performance: testing the performance of the uniformly mixed mixture to meet the requirement;
4) molding a mold: manufacturing a mould according to the designed size, and extruding and forming the mixture in the mould in a pressing-in mode;
5) curing and curing: and curing the formed product at room temperature for 24h, curing in a curing tank for 28d, putting saturated lime water into the curing tank, and drying the cured product in a 105 ℃ ventilation furnace for 24h to obtain the heat-insulating and sound-insulating building material.
2. The method for preparing a heat-insulating and sound-insulating building material by recycling stone powder and waste cotton according to claim 1, wherein the strength grade of the cement in the step 1) is 42.5MPa, and the specific surface area is 2200-2300cm2(g), the 200 mu m sieve residue is 0.35 percent, the initial setting time is 160min and the final setting time is 260min and 130-.
3. The method for preparing heat-preservation and sound-insulation building material by recycling stone powder and waste cotton according to claim 1, wherein NaOH solution, NaCl solution and Na in the step (i)2CO3The volume ratio of the solution was 16:3: 1.
4. The method for preparing the heat-preservation and sound-insulation building material by recycling the stone powder and the waste cotton according to claim 1, wherein the stone powder is limestone powder, the content of calcium carbonate is more than or equal to 75 percent, the 28d activity index is more than or equal to 60 percent, and the fineness is less than or equal to 15 percent.
5. The method for preparing a thermal insulation and sound insulation building material by recycling stone powder and waste cotton according to claim 1, wherein the admixture is granulated blast furnace slag powder with a volume weight of 2300-2400kg/m3The specific surface area is 350-370m2The activity index of/kg, 28d is more than or equal to 75 percent, and the water demand ratio is less than or equal to 115 percent.
6. The method for preparing the heat-preservation sound-insulation building material by recycling the stone powder and the waste cotton according to claim 1, wherein the high-efficiency water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is 25% -30%.
7. The method for preparing the heat and sound insulation building material by recycling the stone powder and the waste cotton according to claim 1, wherein the product formed in the step 5) is a plate or a block.
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Citations (2)

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Publication number Priority date Publication date Assignee Title
CN106284713A (en) * 2016-08-15 2017-01-04 马常芳 The foam cement polyurethane foam composite insulation boards that a kind of pore is stable
CN107673696A (en) * 2017-10-26 2018-02-09 陈宗熙 A kind of foam concrete self-insulating wall material and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT383588B (en) * 1980-05-30 1987-07-27 Partek Ab BUILDING PLATE BASE PANEL TO BE MANUFACTURED ON THE PLASTER BASE

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106284713A (en) * 2016-08-15 2017-01-04 马常芳 The foam cement polyurethane foam composite insulation boards that a kind of pore is stable
CN107673696A (en) * 2017-10-26 2018-02-09 陈宗熙 A kind of foam concrete self-insulating wall material and preparation method thereof

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