CN108314375B - Regenerated viscose mortar and preparation method thereof - Google Patents

Regenerated viscose mortar and preparation method thereof Download PDF

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Publication number
CN108314375B
CN108314375B CN201810043898.9A CN201810043898A CN108314375B CN 108314375 B CN108314375 B CN 108314375B CN 201810043898 A CN201810043898 A CN 201810043898A CN 108314375 B CN108314375 B CN 108314375B
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mortar
regenerated
viscose
fine aggregate
powder
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CN108314375A (en
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肖建庄
马志鸣
段珍华
张青天
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Tongji University
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Tongji University
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00Use 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
    • C04B18/04Waste materials; Refuse
    • C04B18/16Waste materials; Refuse from building or ceramic industry
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00Use 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
    • C04B20/02Treatment
    • C04B20/026Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017Aspects relating to the protection of the environment
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention provides a formula of regenerated viscose mortar. The invention further provides a preparation method of the regenerated viscose mortar. The invention further provides the regenerated viscose mortar and application thereof. The regenerated viscose mortar and the preparation method thereof provided by the invention not only solve the problem of demand of high-quality natural fine aggregate in the special viscose mortar, but also reduce the use amount of cement, and the large-scale application of related achievements further promotes the recycling level of construction waste in China, and particularly for the application of the high-quality regenerated fine aggregate and high-activity regenerated powder in the special viscose mortar, the preparation of full 'regenerated' raw materials of the special viscose mortar in the true sense is realized, and the environmental benefit, the economic benefit and the social benefit are more remarkable.

Description

Regenerated viscose mortar and preparation method thereof
Technical Field
The invention belongs to the technical field of civil engineering materials, relates to regenerated viscose mortar and a preparation method thereof, and particularly relates to viscose mortar prepared from regenerated raw materials and a preparation method thereof.
Background
The waste concrete and the waste red bricks in the construction waste account for 4/5 of the total amount of the urban construction waste, and the regeneration technology is an effective way for realizing the resource utilization of the construction waste by utilizing the waste concrete and the bricks to produce regeneration raw materials. At present, the recycled raw materials produced in China mainly comprise recycled fine aggregates and powder with the grain diameter of 0.1-5mm and recycled coarse aggregates with the grain diameter of 5-31.5 mm. The recycled coarse aggregate can be widely applied to high quality; however, most of the recycled fine aggregates and recycled powders are used as filling materials for low-quality and extensive application, and how to realize high-quality and high-added-value application of the recycled fine aggregates and the recycled powders is the direction of future development of recycling of construction wastes in China.
Along with the development of the building industry in China, the demand for natural sandstone aggregates is increasing day by day; in particular, the demand for high quality natural raw materials in the production of special mortars is more urgent. However, the mining of natural sandstone aggregates has been gradually reduced in China to alleviate the increasingly serious environmental problems. The serious shortage and insufficient supply of natural sandstone aggregate appear in many areas of China, and the healthy and orderly development of the construction industry is restricted. Therefore, there is a need to develop a building material that can replace natural building materials, especially high-quality recycled fine aggregates. Most of the viscose mixtures (such as ceramic tile glue mixtures) are high-quality natural fine aggregates of 40-140 meshes, but the supply of the high-quality natural fine aggregates in China cannot meet the production requirements of special viscose mortar mixtures. Meanwhile, as the exploitation of cement has been continuously increased, the shortage of supply of high-quality cement and cement has occurred. Therefore, the development of recycled aggregate similar to high-quality natural aggregate and active recycled powder with the gel property of cement materials is urgently needed at present.
Disclosure of Invention
In view of the defects of the prior art, the invention solves the problems of insufficient supply of construction waste recycling industry and high-quality natural raw materials in China, and combines the construction waste recycling and high-quality regenerated raw material production technology, and aims to provide the high-quality regenerated raw material viscose mortar which is low in production cost, high in waste material utilization rate, high in additional value, simple in process, good in stress performance, green and environment-friendly, and the preparation method thereof, and can be used for large-scale production and engineering application of viscose type mortar such as ceramic tile glue.
In order to achieve the above and other related objects, a first aspect of the present invention provides a formulation of a recycled viscose mortar, comprising the following components in parts by weight:
the components are metered and mixed to prepare the needed viscose mortar mixture produced by the regenerated raw materials. Preferably, the formula of the regenerated viscose mortar comprises the following components in parts by weight:
more preferably, the formula of the regenerated viscose mortar comprises the following components in parts by weight:
further preferably, the formula of the regenerated viscose mortar comprises the following components in parts by weight:
preferably, the cement is selected from any one of portland cement and ordinary portland cement. The ordinary portland cement is prepared by adding 6-20% of mixed materials and a proper amount of gypsum into portland cement clinker and grinding. The ordinary Portland cement has less mixed materials, and the components of the ordinary Portland cement are close to those of the Portland cement, so the ordinary Portland cement and the Portland cement have close performance, and can be replaced under certain conditions, if the concrete with high strength and high hardness is required, the Portland cement is preferably adopted generally, the ordinary Portland cement can also be adopted, and the application range of the ordinary Portland cement is wider.
Preferably, the strength grade of the cement is more than or equal to 32.5 grade. More preferably, the strength grade of the cement is more than or equal to 42.5 grade.
Preferably, the active regeneration powder is powder which is obtained by crushing the construction waste into powder with the particle size less than or equal to 75 mu m. The active regeneration powder is mineral admixture (cementing material).
More preferably, in the active regeneration powder, the mass percentage of the active regeneration powder with the particle size less than or equal to 45 μm in the total active regeneration powder is more than or equal to 50%.
Further preferably, in the active regeneration powder, the mass percentage of the active regeneration powder with the particle size less than or equal to 45 μm in the total active regeneration powder is more than or equal to 88%.
More preferably, in the active regeneration powder, the mass percentage of the active regeneration powder with the grain diameter less than or equal to 30 μm in the total active regeneration powder is more than or equal to 95%.
Preferably, the active regeneration powder is in a completely dry state, wherein the completely dry state is that the active regeneration powder is placed in a drying box to be dried for 24 hours at the temperature of 100 ℃ and 110 ℃, and the mass change of the active regeneration powder is less than 0.1%.
Preferably, the natural fine aggregate is natural river sand with the particle size of 40-140 meshes.
Preferably, in the natural fine aggregate, the mass ratio of the natural fine aggregate with the particle size of 40-120 meshes to the natural fine aggregate with the particle size of 120-140 meshes is more than or equal to 3: 1.
Preferably, the natural fine aggregate is subjected to water washing treatment, the mud content of the washed natural fine aggregate is less than or equal to 0.8%, and the mud block content of the washed natural fine aggregate is less than or equal to 0.3%.
Preferably, the recycled fine aggregate is construction waste particles crushed into construction waste particles with the particle size of 40-140 meshes. The recycled fine aggregate is obtained by crushing and screening construction waste. The crushing is carried out by adopting a cone crusher. And the screening is carried out by adopting a mechanical screening machine.
Preferably, in the recycled fine aggregate, the mass ratio of the recycled fine aggregate with the particle size of 40-120 meshes to the recycled fine aggregate with the particle size of 120-140 meshes is more than or equal to 3: 1.
Preferably, the recycled fine aggregate is subjected to water washing treatment, the mud content of the recycled fine aggregate after water washing is less than or equal to 0.5%, and the mud block content of the recycled fine aggregate after water washing is less than or equal to 0.3%.
More preferably, the construction waste comprises waste concrete and waste red bricks.
Further preferably, the mass percentage of the waste red bricks in the construction waste is less than or equal to 50%.
More preferably, the mass percentage of the waste red bricks in the construction waste is less than or equal to 20%.
Preferably, the cellulose is selected from one of hydroxypropyl methylcellulose or lignocellulose. The mortar prepared from the regenerated viscose mortar mixture has good working performance and good appearance performance (no cracking).
Preferably, the ground calcium carbonate is a conventionally used ground calcium carbonate, which is commercially available. The heavy calcium carbonate ensures that mortar prepared from the regenerated viscose mortar mixture has good toughness and strength, and has the functions of rapid solidification and lubrication.
Preferably, the redispersible latex powder is a conventionally used redispersible latex powder, which is commercially available. Specifically, the redispersible latex powder is selected from one of copolymer rubber powder of vinyl acetate and ethylene, ternary copolymer powder of ethylene, vinyl chloride and vinyl laurate, ternary copolymer powder of vinyl acetate, ethylene and vinyl ester of higher fatty acid, vinyl acetate homopolymerized rubber powder and styrene and butadiene copolymer rubber powder. The redispersible latex powder is used for improving the construction performance and the flow performance of mortar prepared from the regenerated viscose mortar mixture.
Preferably, the starch ether is a conventionally used starch ether, commercially available. Specifically, the starch ether is modified by a natural polymer of polysaccharides such as dextran or mannan to obtain a water-soluble powder. The starch ether ensures that mortar prepared from the regenerated viscose mortar mixture has good anti-sagging capability and good lubricity, and can improve the operating performance of the material and make the operation smoother.
The second aspect of the invention provides a preparation method of regenerated viscose mortar, which comprises the following steps:
1) according to the formula ratio, stirring the components to obtain a regenerated viscose mortar mixture;
2) and mixing the regenerated viscose mortar mixture with water to obtain the required regenerated viscose mortar.
Preferably, in the step 1), the stirring time is more than or equal to 2 min. More preferably, the stirring time is 10min or more. The different components are mixed thoroughly.
Preferably, in step 1), the temperature of the stirring is 10 to 60 ℃. More preferably, the temperature of the stirring is 20-40 ℃.
Preferably, in step 1), the relative humidity of the stirring is less than or equal to 50%. More preferably, the relative humidity of the agitation is 20% or less. The powder is not hydrated and hardened after being mixed.
Preferably, in the step 1), the recycled fine aggregate is obtained by crushing and screening construction waste in the recycled viscose mortar mixture.
More preferably, the crushing is performed using a jaw crusher or a cone crusher.
More preferably, the screening is performed using a mechanically vibrating sieve bed.
Preferably, in the step 1), the active regenerated powder is obtained by crushing, grinding and screening construction waste in the regenerated viscose mortar mixture.
More preferably, the crushing is performed using a jaw crusher or a cone crusher.
More preferably, the grinding is carried out using a ball mill.
More preferably, the screening is performed using a mechanically vibrating sieve bed.
Preferably, in the step 2), the mass ratio of the regenerated viscose mortar mixture to water is 1: 0.1-0.4.
More preferably, the mass ratio of the regenerated viscose mortar mixture to water is 1: 0.15-0.35.
Further preferably, the mass ratio of the regenerated viscose mortar mixture to water is 1: 0.2-0.3.
Preferably, in the step 2), the mixing time is more than or equal to 1 min. More preferably, the mixing time is 3-5 min.
The third aspect of the invention provides regenerated viscose mortar, which is prepared by the formula of the regenerated viscose mortar or the preparation method of the regenerated viscose mortar.
The fourth aspect of the invention provides the application of the regenerated viscose mortar in tile glue or stone glue.
The fifth aspect of the invention provides a construction method of regenerated adhesive mortar, which is to respectively coat the regenerated adhesive mortar on the cleaned wall surface layer and the back of the ceramic tile or the stone to be bonded, and forcibly rub and squeeze the back of the ceramic tile or the stone on the wall surface layer for bonding.
Preferably, the construction temperature is 5-35 ℃. More preferably, the temperature of the construction is 20-35 ℃.
Preferably, the regenerated viscose mortar should be used within 2-3 hours.
Preferably, water drenching is avoided during and within 24 hours after the construction.
As described above, the regenerated viscose mortar and the preparation method thereof provided by the invention have the following beneficial effects:
1) according to the regenerated viscose mortar and the preparation method thereof provided by the invention, the used production raw materials of the high-quality regenerated fine aggregate and the high-activity regenerated powder are all derived from building wastes, and the high-quality regenerated fine aggregate with higher particle roundness and similar performance to that of high-quality natural sand and the high-quality regenerated powder with better fineness and activity and similar performance to that of cement are obtained through high-efficiency resource technologies such as screening, crushing, grinding and the like, so that the prepared regenerated viscose mortar mixture and the prepared regenerated viscose mortar have excellent working performance and mechanical performance.
2) According to the regenerated viscose mortar and the preparation method thereof provided by the invention, the preparation of the high-quality regenerated fine aggregate, the active regenerated powder and the viscose mortar mixture is combined, the preparation method for producing the special viscose mortar mixture by using the high-quality regenerated raw material is firstly provided, the preparation method has the characteristics of low production cost, high environmental benefit and economic benefit and the like, and the problem of insufficient supply of high-quality natural sand and high-quality cement stone in China at the present stage is solved.
3) According to the regenerated viscose mortar and the preparation method thereof provided by the invention, the traditional extensive construction waste recycling mode is changed, a new recycling path is provided for the construction waste recycling of China through the production and application of high-quality regenerated raw materials, and the traditional extensive type of recycling treatment is changed into the refined high-added-value industry.
4) According to the regenerated viscose mortar and the preparation method thereof provided by the invention, the physical index parameters such as the fineness, the mud content and the like of the high-quality regenerated fine aggregate can reach or even exceed the related parameters of high-quality natural sand, and the regenerated viscose mortar can be widely used for preparing regenerated ceramic tile glue, and the construction performance, the appearance and the safety performance all meet the requirements of engineering and standard standards.
5) The regenerated viscose mortar produced by the high-quality regenerated fine aggregate-high-activity regenerated powder system regeneration raw material provided by the invention has higher recycling efficiency, can greatly absorb construction waste, and accelerates the recycling process of the construction waste in China.
Detailed Description
The present invention is further illustrated below with reference to specific examples, which are intended to be illustrative only and not to limit the scope of the invention.
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The following starting materials were used in comparative example 1 and examples 1-3:
1) cement: p.o42.5 portland cement.
2) Construction waste: the concrete brick comprises a mixture of waste concrete and waste red bricks, wherein the waste red bricks account for 10% of the construction waste by mass.
3) Active regeneration powder: the crushed construction waste with the grain diameter less than or equal to 75 mu m, and the active regeneration powder with the grain diameter less than or equal to 45 mu m accounts for more than or equal to 88 percent of the total mass of the active regeneration powder.
4) Natural fine aggregate: the natural river sand with the particle size of 40-140 meshes comprises 40 percent of natural fine aggregate with the particle size of 40-80 meshes, 40 percent of natural fine aggregate with the particle size of 80-120 meshes and 20 percent of natural fine aggregate with the particle size of 120-140 meshes. The mud content of the natural fine aggregate is less than or equal to 0.2 percent.
5) Regenerating fine aggregate: the crushed construction waste has the particle size of 40-140 meshes. The recycled fine aggregate with the particle size of 40-80 meshes accounts for 40 percent, the recycled fine aggregate with the particle size of 80-120 meshes accounts for 40 percent, and the recycled fine aggregate with the particle size of 120-140 meshes accounts for 20 percent. The mud content of the recycled fine aggregate is less than or equal to 0.2 percent.
6) Cellulose: lignocellulose meeting the national standard.
7) Heavy calcium carbonate: the conventionally used heavy calcium carbonate which meets the national standard.
8) Redispersible latex powder: the conventional redispersible latex powder meets the national standard.
9) Starch ether: the starch ether which is used conventionally meets the national standard.
Comparative example 1
A control sample of the regenerated viscose mortar mixture is prepared according to the following formula, and the formula of the control sample of the regenerated viscose mortar mixture is shown in Table 1. And mixing the control sample of the regenerated viscose mortar mixture with water to obtain the control sample of the regenerated viscose mortar. Wherein the mass ratio of the control sample of the regenerated viscose mortar mixture to the water is 1: 0.25. Construction is carried out on a control sample of the regenerated viscose mortar, a thin-pasting method is utilized for batch scraping without obstacles, the coating rate meets the standard, no obvious apparent cracking exists, the actually measured tensile bonding strength is more than or equal to 0.9MPa, the tensile bonding strength after soaking is more than or equal to 1.0MPa, and related technical indexes meet the requirements of national standard (JC/T547-2005).
TABLE 1
Formulation components Proportion (kg)
Cement 330
Active regeneration powder 0
Natural fine aggregate 600
Recycled fine aggregate 0
Lignocellulose 4
Ground calcium carbonate 5
Redispersible latex powder 20
Starch ethers 10
Example 1
The regenerated viscose mortar mixture sample No. 1 is prepared according to the following formula, and the formula in the regenerated viscose mortar mixture sample No. 1 is shown in Table 2. And mixing the regenerated viscose mortar mixture sample 1# with water to obtain a regenerated viscose mortar sample 1 #. Wherein the mass ratio of the regenerated viscose mortar mixture sample No. 1 to water is 1: 0.25. The regenerated viscose mortar sample 1 is constructed, a thin-pasting method is utilized to scrape the regenerated viscose mortar sample without obstacles, the coating rate meets the standard, no obvious apparent cracking exists, the actually measured tensile bonding strength is more than or equal to 1.0MPa, the tensile bonding strength after soaking is more than or equal to 1.1MPa, and the related technical indexes meet the regulations of national standard (JC/T547-.
TABLE 2
Formulation components Proportion (kg)
Cement 330
Active regeneration powder 0
Natural fine aggregate 300
Recycled fine aggregate 300
Lignocellulose 4
Ground calcium carbonate 5
Redispersible latex powder 20
Starch ethers 10
Example 2
The regenerated viscose mortar mixture sample No. 2 is prepared according to the following formula, and the formula in the regenerated viscose mortar mixture sample No. 2 is shown in Table 3. And mixing the regenerated viscose mortar mixture sample 2# with water to obtain a regenerated viscose mortar sample 2. Wherein the mass ratio of the regenerated viscose mortar mixture sample No. 2 to the water is 1: 0.25. Constructing a regenerated viscose mortar sample 2, scraping by using a thin-pasting method without obstacles, ensuring that the coating rate meets the standard and has no obvious apparent cracking, ensuring that the actually measured tensile bonding strength is more than or equal to 0.95MPa, the tensile bonding strength after soaking is more than or equal to 1.1MPa, and meeting the requirements of national standard (JC/T547-.
TABLE 3
Formulation components Proportion (kg)
Cement 330
Active regeneration powder 0
Natural fine aggregate 0
Recycled fine aggregate 600
Lignocellulose 4
Ground calcium carbonate 5
Redispersible latex powder 20
Starch ethers 10
Example 3
The regenerated viscose mortar mixture sample No. 3 is prepared according to the following formula, and the formula in the regenerated viscose mortar mixture sample No. 3 is shown in Table 4. And mixing the regenerated viscose mortar mixture sample 3# with water to obtain a regenerated viscose mortar sample 3. Wherein the mass ratio of the regenerated viscose mortar mixture sample No. 3 to the water is 1: 0.28. Constructing a regenerated viscose mortar sample 3, scraping by using a thin-pasting method without obstacles, ensuring that the coating rate meets the standard and has no obvious apparent cracking, ensuring that the actually measured tensile bonding strength is more than or equal to 1.1MPa, the tensile bonding strength after soaking is more than or equal to 1.2MPa, and meeting the regulation of national standard (JC/T547-.
TABLE 4
Formulation components Proportion (kg)
Cement 270
Active regeneration powder 60
Natural fine aggregate 0
Recycled fine aggregate 600
Lignocellulose 4
Ground calcium carbonate 5
Redispersible latex powder 20
Starch ethers 10
The workability, coating rate index, appearance characteristics and tensile adhesion strength of the regenerated viscose mortar produced from the regenerated raw materials were measured based on the above comparative example 1 and examples 1 to 3. The result shows that the regenerated viscose mortar produced by using the regenerated raw materials has good working performance and mechanical property, meets the national standard requirements, and can well meet the construction performance and safety of the regenerated viscose mortar.
In conclusion, the regenerated viscose mortar and the preparation method thereof provided by the invention not only solve the problem of demand of high-quality natural fine aggregate in the regenerated viscose mortar, but also reduce the using amount of cement, and the large-scale application of related results further promotes the recycling level of construction waste in China, and particularly realizes the recycling of the regenerated material in the regenerated viscose mortar for the common application of the high-quality regenerated fine aggregate and the high-activity regenerated powder, so that the environmental benefit, the economic benefit and the social benefit are more remarkable. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (8)

1. The regenerated viscose mortar comprises the following components in parts by weight:
the components include any one or more of the following conditions:
A1) the cement is selected from any one of Portland cement or ordinary Portland cement;
A2) the active regeneration powder is powder which is obtained by crushing the building waste into powder with the particle size less than or equal to 75 mu m;
A3) the natural fine aggregate is natural river sand with the particle size of 40-140 meshes;
A4) the recycled fine aggregate is construction waste particles with the particle size of 40-140 meshes, which are obtained by crushing construction waste;
A5) the cellulose is selected from one of hydroxypropyl methyl cellulose or lignocellulose;
the construction waste comprises waste concrete and waste red bricks, and the mass percentage of the waste red bricks in the construction waste is less than or equal to 50%;
in the active regeneration powder, the mass percentage of the active regeneration powder with the grain diameter less than or equal to 45 mu m in the total active regeneration powder is more than or equal to 50 percent;
in the natural fine aggregate, the mass ratio of the natural fine aggregate with the particle size of 40-120 meshes to the natural fine aggregate with the particle size of 120-140 meshes is more than or equal to 3: 1;
in the recycled fine aggregate, the mass ratio of the recycled fine aggregate with the particle size of 40-120 meshes to the recycled fine aggregate with the particle size of 120-140 meshes is more than or equal to 3: 1;
the recycled fine aggregate is subjected to water washing treatment, the mud content of the recycled fine aggregate after water washing is less than or equal to 0.5 percent, and the mud block content of the recycled fine aggregate after water washing is less than or equal to 0.3 percent;
the re-dispersible latex powder is selected from one of copolymer rubber powder of vinyl acetate and ethylene, ternary copolymer powder of ethylene, vinyl chloride and vinyl laurate, ternary copolymer powder of vinyl acetate, ethylene and vinyl ester of higher fatty acid, vinyl acetate acid homopolymerization rubber powder and styrene and butadiene copolymer rubber powder.
2. A method for preparing a recycled viscose mortar according to claim 1, comprising the following steps:
1) according to the proportion, all the components are stirred to obtain a regenerated viscose mortar mixture;
2) and mixing the regenerated viscose mortar mixture with water to obtain the required regenerated viscose mortar.
3. The preparation method of the regenerated viscose mortar according to claim 2, wherein in the step 1), the stirring time is not less than 2 min; the stirring temperature is 10-60 ℃; the relative humidity of the stirring is less than or equal to 50 percent.
4. The preparation method of the regenerated viscose mortar according to claim 2, wherein in the step 2), the mass ratio of the regenerated viscose mortar mixture to water is 1: 0.1-0.4.
5. The preparation method of the regenerated viscose mortar according to claim 2, wherein in the step 2), the mixing time is not less than 1 min.
6. Regenerated viscose mortar prepared by the method for preparing the regenerated viscose mortar according to claim 1 or any one of claims 2 to 5.
7. Use of the recycled cementitious mortar according to claim 6 in tile or stone glues.
8. A construction method of regenerated viscose mortar, which comprises the steps of respectively coating the regenerated viscose mortar according to claim 7 on the cleaned wall surface layer and the back surface of the ceramic tile or stone to be bonded, and forcibly rubbing the back surface of the ceramic tile or stone onto the wall surface layer for bonding.
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CN109095836B (en) * 2018-08-10 2020-07-14 同济大学 Recycled powder concrete for 3D printing construction and preparation method
CN109020369B (en) * 2018-08-10 2020-06-23 同济大学 Concrete material for 3D printing and preparation method
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