CN114031340B - Plastering mortar containing recycled aggregate of waste clay brick - Google Patents

Plastering mortar containing recycled aggregate of waste clay brick Download PDF

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Publication number
CN114031340B
CN114031340B CN202111440939.6A CN202111440939A CN114031340B CN 114031340 B CN114031340 B CN 114031340B CN 202111440939 A CN202111440939 A CN 202111440939A CN 114031340 B CN114031340 B CN 114031340B
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recycled aggregate
waste clay
plastering mortar
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parts
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CN202111440939.6A
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CN114031340A (en
Inventor
高建明
徐振海
郭照恒
赵亚松
朱兆辉
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Southeast University
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Southeast University
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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
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/46—Water-loss or fluid-loss reducers, hygroscopic or hydrophilic agents, water retention 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00482—Coating or impregnation materials
    • C04B2111/00508—Cement paints
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses plastering mortar containing recycled aggregate of waste clay bricks, which consists of the following raw materials in parts by weight: 110 to 170 parts of cement, 30 to 90 parts of fly ash, 400 to 560 parts of river sand, 240 to 400 parts of recycled aggregate of waste clay bricks and 0.16 to 1 part of water retention thickener. The plastering mortar prepared by using the recycled aggregate of the waste clay bricks as the raw material can realize resource utilization of the waste clay bricks, reduce the harm of wastes to the environment, save river sand resources and reduce the production cost of the plastering mortar, and meanwhile, the prepared plastering mortar has higher water retention rate, compressive strength and tensile bonding strength.

Description

Plastering mortar containing recycled aggregate of waste clay brick
Technical Field
The invention relates to a building material, in particular to plastering mortar containing recycled aggregate of waste clay bricks.
Background
The plastering mortar is used for the surface of a building or a building member, has the functions of protecting a wall body and the ground from erosion of wind, rain and harmful impurities, improving the moisture resistance, corrosion resistance and weathering resistance, increasing the durability and simultaneously ensuring that the building achieves the effects of smooth surface, cleanness and beauty. River sand is one of important raw materials for preparing plastering mortar, but with the continuous promotion of urbanization and industrialization, a large amount of river sand resources are rapidly consumed. In recent years, the continuous tightening of environmental protection policies limits the exploitation of river sand resources, which leads to the increasing scarcity of river sand resources and seriously restricts the healthy development of plastering mortar industry, and the existing plastering mortar has insufficient water retention rate, compressive strength and tensile bonding strength and cannot meet the requirements.
The removal of old buildings in the course of urbanization can generate a large amount of construction waste. Currently, most of the demolished buildings are brick masonry structures, and about half of the construction waste is clay bricks. In the past decades, china has produced over 200 hundred million meters 3 The clay bricks of (1), and the clay bricks are finally removed. However, most of the waste clay bricks have been mainly disposed of in landfills so far. Not only occupies a large amount of valuable land resources, but also causes environmental pollution in the processes of transportation, landfill and storage. Therefore, the resource utilization of the waste clay bricks is imperative and urgent.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide plastering mortar containing recycled aggregate of waste clay bricks, which solves the problems that the performance of the existing plastering mortar cannot meet the requirement and the waste clay bricks are not recycled.
The technical scheme is as follows: the plastering mortar containing the recycled aggregate of the waste clay brick comprises the following raw materials in parts by weight:
110 to 170 portions of cement
30-90 parts of fly ash
400 to 560 portions of river sand
240-400 parts of recycled aggregate of waste clay brick
0.16 to 1 portion of water retention thickening agent.
The sieve residue of the square-hole sieve with the granularity of 45 microns of the fly ash is less than or equal to 30 percent, the water requirement ratio is less than or equal to 105 percent, the water content is less than or equal to 1.0 percent, and SiO 2 、Al 2 O 3 And Fe 2 O 3 The total mass fraction is more than or equal to 70 percent.
The fineness modulus of the river sand is 2.3-3.0, the mud content is less than or equal to 2.0%, and the mud block content is less than or equal to 1.0%.
The particle size of the recycled aggregate of the waste clay brick is less than 4.75 mm, the fineness modulus is 2.3-3.3, the content of particles smaller than 75 micrometers is less than or equal to 15%, the content of micro powder of the recycled fine aggregate is controlled, and excessively high micro powder content can cause excessively high consistency loss rate and excessively short setting time of plastering mortar.
The water-retaining thickener is any one of hydroxypropyl methyl cellulose ether, methyl cellulose ether or hydroxyethyl methyl cellulose ether.
The technical principle is as follows: the recycled aggregate of the waste clay brick has porous surface and higher water absorption than river sand, can reduce the effective water-cement ratio in cement paste and improve the water retention rate of plastering mortar. In addition, the micro powder in the recycled aggregate of the waste clay brick has volcanic ash activity, and can perform volcanic ash reaction with a hydration product calcium hydroxide of cement to generate hydrated calcium silicate gel, so that the microstructure of cement slurry in plastering mortar is optimized. The surface of the recycled aggregate of the waste clay brick is porous, and cement paste can enter gaps of the aggregate, so that the friction force of an interface transition area between the aggregate and the cement paste is increased. In addition, the surface of the recycled aggregate of the waste clay brick can also react with calcium hydroxide to generate hydration products, and the microstructure of the interface transition region is optimized. Therefore, the waste clay brick recycled aggregate with proper mixing amount can improve the compressive strength and the tensile bonding strength of the plastering mortar.
Has the advantages that: the invention can realize the resource utilization of the waste clay bricks, avoids the occupation of land resources and the pollution to the environment, reduces the consumption of river sand by plastering mortar, reduces the consumption of natural river sand resources, improves the water retention rate of the plastering mortar by waste clay brick recycled aggregate, improves the pore structure, and improves the compressive strength and the tensile bonding strength of the plastering mortar by waste clay brick recycled aggregate with proper mixing amount.
Detailed Description
The present invention will be further described with reference to comparative examples and examples.
Taking plastering mortar without adding waste clay brick recycled aggregate as a comparative example, the concrete is as follows:
comparative example 1
The plastering mortar without the recycled aggregate of the waste clay brick comprises the following components: 110 portions of cement, 90 portions of fly ash, 800 portions of river sand and 0.16 portion of water-retaining thickener.
Wherein the cement is ordinary portland cement; the particle size of the fly ash is 45 microns, the screen residue of a square hole sieve is less than or equal to 30 percent, the water requirement ratio is 102 percent, the water content is less than or equal to 1.0 percent, and SiO 2 、Al 2 O 3 And Fe 2 O 3 The total mass fraction is 86%; the fineness modulus of the river sand is 2.4, the mud content is 1.68 percent, and the mud block content is 0.2 percent; the water-retaining thickener is hydroxypropyl methyl cellulose ether.
And uniformly stirring the raw materials, adding water, stirring, and controlling the consistency of the mortar to be 90-100 mm to obtain the plastering mortar containing the recycled aggregate of the waste clay brick.
And testing the water retention rate, consistency loss rate, compressive strength and tensile bonding strength of the plastering mortar according to the test methods of national standard GB/T25181-2019 premixed mortar and industrial standard JGJ/T70-2009 building mortar basic performance test method standard. The water retention rate is 88.7 percent, the consistency loss rate is 13.7 percent, the 28-day compressive strength is 9.78mpa, and the 14-day tensile bond strength is 0.45Mpa.
Comparative example 2
The plastering mortar without the recycled aggregate of the waste clay brick comprises the following components: 140 parts of cement, 60 parts of fly ash, 800 parts of river sand and 0.5 part of water-retaining thickener.
Wherein the cement is ordinary portland cement; the particle size of the fly ash is 45 microns, the screen residue of a square hole sieve is less than or equal to 30 percent, the water requirement ratio is 102 percent, the water content is less than or equal to 1.0 percent, and SiO 2 、Al 2 O 3 And Fe 2 O 3 The total mass fraction is 86%; the fineness modulus of the river sand is 2.9, the mud content is 1.82 percent, and the mud block content is 0.5 percent; the water-retaining thickener is methyl cellulose ether.
The raw materials are evenly stirred, water is added for stirring, and the thickness of the mortar is controlled to be 90-100 mm, so that the plastering mortar containing the recycled aggregate of the waste clay brick is prepared.
And testing the water retention rate, consistency loss rate, compressive strength and tensile bonding strength of the plastering mortar according to the test methods of national standard GB/T25181-2019 premixed mortar and industrial standard JGJ/T70-2009 building mortar basic performance test method standard. The water retention rate is 90.1%, the consistency loss rate is 14.6%, the 28-day compressive strength is 13.54mpa, and the 14-day tensile bonding strength is 0.58Mpa.
Comparative example 3
The plastering mortar without the recycled aggregate of the waste clay brick comprises the following components: 170 parts of cement, 30 parts of fly ash, 800 parts of river sand and 1 part of water-retaining thickener.
Wherein the cement is portland cement; the grain size of the fly ash is 45 microns, the screen residue of a square hole sieve is less than or equal to 30 percent, the water requirement ratio is 102 percent, the water content is less than or equal to 1.0 percent, and SiO 2 、Al 2 O 3 And Fe 2 O 3 The total mass fraction is 86%; the fineness modulus of the river sand is 2.9, the mud content is 1.82 percent, and the mud block content is 0.5 percent; the water-retaining thickener is hydroxyethyl methyl cellulose ether.
The raw materials are evenly stirred, water is added for stirring, and the thickness of the mortar is controlled to be 90-100 mm, so that the plastering mortar containing the recycled aggregate of the waste clay brick is prepared.
And testing the water retention rate, consistency loss rate, compressive strength and tensile bonding strength of the plastering mortar according to the test methods of national standard GB/T25181-2019 premixed mortar and industrial standard JGJ/T70-2009 building mortar basic performance test method standard. The water retention rate is 92.7 percent, the consistency loss rate is 9.8 percent, the 28-day compressive strength is 15.32Mpa, and the 14-day tensile bonding strength is 0.58Mpa.
Example 1
The plastering mortar containing the recycled aggregate of the waste clay brick comprises the following components: 110 parts of cement, 90 parts of fly ash, 560 parts of river sand, 240 parts of recycled aggregate of waste clay bricks and 0.16 part of water-retaining thickener.
Wherein the cement is ordinary portland cement; the grain size of the fly ash is 45 microns, the screen residue of a square hole sieve is less than or equal to 30 percent, the water requirement ratio is 102 percent, the water content is less than or equal to 1.0 percent, and SiO 2 、Al 2 O 3 And Fe 2 O 3 The total mass fraction is 86%; the fineness modulus of the river sand is 2.4, the mud content is 1.68 percent, and the mud block content is 0.2 percent; the particle size of the recycled aggregate of the waste clay brick is less than 4.75 mm, the fineness modulus is 3.2, and the content of particles smaller than 75 micrometers is 12.21%; the water-retaining thickener is hydroxypropyl methyl cellulose ether.
And uniformly stirring the raw materials, adding water, stirring, and controlling the consistency of the mortar to be 90-100 mm to obtain the plastering mortar containing the recycled aggregate of the waste clay brick. A
The water retention, consistency loss, compressive strength and tensile bond strength of the plastering mortar were measured according to the test methods in the comparative examples. The water retention rate is 89.9%, which is improved by 1.35% compared with the comparative example 1; the consistency loss rate is 15.8%, which is improved by 15.33% compared with the comparative example 1; the 28-day compressive strength is 11.08MPa, which is improved by 13.29 percent compared with the comparative example 1; the tensile bond strength was 0.52MPa for 14 days, which was 15.56% higher than that of comparative example 1.
Example 2
The plastering mortar containing the recycled aggregate of the waste clay brick comprises the following components: 110 parts of cement, 90 parts of fly ash, 400 parts of river sand, 400 parts of waste clay brick recycled aggregate and 0.16 part of water retention thickener.
Wherein the cement is ordinary portland cement; the grain size of the fly ash is 45 microns, the screen residue of a square hole sieve is less than or equal to 30 percent, the water requirement ratio is 102 percent, the water content is less than or equal to 1.0 percent, and SiO 2 、Al 2 O 3 And Fe 2 O 3 The total mass fraction is 86%; the fineness modulus of the river sand is 2.4, the mud content is 1.68 percent, and the mud block content is 0.2 percent; the particle size of the recycled aggregate of the waste clay brick is less than 4.75 mm, the fineness modulus is 3.2, and the content of particles smaller than 75 micrometers is 12.21%; the water-retaining thickener is hydroxypropyl methyl cellulose ether.
And uniformly stirring the raw materials, adding water, stirring, and controlling the consistency of the mortar to be 90-100 mm to obtain the plastering mortar containing the recycled aggregate of the waste clay brick.
The water retention, consistency loss, compressive strength and tensile bond strength of the plastering mortar were tested according to the test methods of comparative examples. The water retention rate is 91.4 percent, which is improved by 3.04 percent compared with the comparative example 1; the consistency loss rate is 22.6%, which is improved by 78.27% compared with the comparative example 1; the 28-day compressive strength is 10.76Mpa, which is improved by 10.02 percent compared with the comparative example 1; the tensile bond strength was 0.51MPa for 14 days, which was 13.33% higher than that of comparative example 1.
Example 3
The plastering mortar containing the recycled aggregate of the waste clay brick comprises the following components: 140 parts of cement, 60 parts of fly ash, 480 parts of river sand, 320 parts of waste clay brick recycled aggregate and 0.5 part of water retention thickener.
Wherein the cement is ordinary portland cement; the grain size of the fly ash is 45 microns, the screen residue of a square hole sieve is less than or equal to 30 percent, the water requirement ratio is 102 percent, the water content is less than or equal to 1.0 percent, and SiO 2 、Al 2 O 3 And Fe 2 O 3 The total mass fraction is 86%; the fineness modulus of the river sand is 2.9, the mud content is 1.82 percent, and the mud block content is 0.5 percent; the particle size of the recycled aggregate of the waste clay brick is less than 4.75 mm, the fineness modulus is 2.8, and the content of particles smaller than 75 micrometers is 13.72%; the water-retaining thickener is methyl cellulose ether.
And uniformly stirring the raw materials, adding water, stirring, and controlling the consistency of the mortar to be 90-100 mm to obtain the plastering mortar containing the recycled aggregate of the waste clay brick.
The water retention, consistency loss, compressive strength and tensile bond strength of the plastering mortar were tested according to the test methods of comparative examples. The water retention rate is 92.2 percent, which is improved by 2.33 percent compared with the comparative example 2; the consistency loss rate is 16.5 percent, which is improved by 13.01 percent compared with the comparative example 2; the 28-day compressive strength is 14.89Mpa, which is improved by 9.97 percent compared with the comparative example 2; the tensile bond strength after 14 days is 0.70MPa, which is improved by 20.69 percent compared with that of the comparative example 2.
Example 4
The plastering mortar containing the recycled aggregate of the waste clay brick comprises the following components: 170 parts of cement, 30 parts of fly ash, 560 parts of river sand, 240 parts of recycled aggregate of waste clay bricks and 1 part of water-retaining thickener.
Wherein the cement is portland cement; the grain size of the fly ash is 45 microns, the screen residue of a square hole sieve is less than or equal to 30 percent, the water requirement ratio is 102 percent, the water content is less than or equal to 1.0 percent, and SiO 2 、Al 2 O 3 And Fe 2 O 3 The total mass fraction is 86%; the fineness modulus of the river sand is 2.9, the mud content is 1.82 percent, and the mud block content is 0.5 percent; the particle size of the recycled aggregate of the waste clay brick is less than 4.75 mm, the fineness modulus is 2.8, and the content of particles smaller than 75 micrometers is 13.72 percent; the water-retaining thickener is hydroxyethyl methyl cellulose ether.
The raw materials are evenly stirred, water is added for stirring, and the thickness of the mortar is controlled to be 90-100 mm, so that the plastering mortar containing the recycled aggregate of the waste clay brick is prepared.
The water retention, consistency loss, compressive strength and tensile bond strength of the plastering mortar were tested according to the test methods of comparative examples. The water retention rate is 94.6 percent, which is improved by 2.05 compared with the comparative example 3; the consistency loss rate is 11.8 percent, which is improved by 20.41 percent compared with the comparative example 3; the 28-day compressive strength is 16.20Mpa, which is improved by 5.74 percent compared with the comparative example 3; the tensile bond strength was 0.71MPa for 14 days, which was 22.41% higher than that of comparative example 3.
In conclusion, the recycled aggregate of the waste clay brick adopted by the invention has porous surface, high micro powder content and high water absorption rate, and is easy to cause the consistency loss rate of the plastering mortar to increase, the maximum mixing amount of the recycled aggregate of the waste clay brick is 50 percent of the total amount of the fine aggregate, so that the problem that the consistency loss rate of the plastering mortar within 2 hours is not qualified when the mixing amount of the recycled aggregate of the waste clay brick exceeds 50 percent is solved.

Claims (4)

1. The plastering mortar containing the recycled aggregate of the waste clay brick is characterized by comprising the following raw materials in parts by weight:
110 to 170 portions of cement
30-90 parts of fly ash
400 to 560 portions of river sand
240-400 parts of recycled aggregate of waste clay brick
0.16-1 part of water-retaining thickening agent;
the particle size of the recycled aggregate of the waste clay brick is less than 4.75 mm, the fineness modulus is 2.3-3.3, and the content of particles smaller than 75 micrometers is less than or equal to 15%.
2. The plastering mortar containing recycled aggregate of waste clay bricks as claimed in claim 1, wherein the particle size of the fly ash is 45 μm square-hole sieve residue is less than or equal to 30%, the water demand ratio is less than or equal to 105%, the water content is less than or equal to 1.0%, and SiO is 2 、Al 2 O 3 And Fe 2 O 3 The total mass fraction is more than or equal to 70 percent.
3. The plastering mortar containing recycled aggregate of waste clay bricks as claimed in claim 1, wherein the fineness modulus of the river sand is 2.3-3.0, the mud content is less than or equal to 2.0%, and the mud cake content is less than or equal to 1.0%.
4. The plastering mortar containing recycled aggregate of waste clay bricks as claimed in claim 1, wherein the water-retaining thickener is any one of hydroxypropyl methyl cellulose ether, methyl cellulose ether or hydroxyethyl methyl cellulose ether.
CN202111440939.6A 2021-11-30 2021-11-30 Plastering mortar containing recycled aggregate of waste clay brick Active CN114031340B (en)

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CN114956743A (en) * 2022-04-07 2022-08-30 临沂蓝泰环保科技有限公司 Wet-mixed mortar containing modified recycled brick-concrete sand powder, preparation process and application
CN114988798A (en) * 2022-05-30 2022-09-02 东南大学 Masonry mortar prepared from recycled brick aggregate and preparation method thereof
CN114890757A (en) * 2022-06-30 2022-08-12 深圳市衡骏环保科技有限公司 Recycled aggregate concrete and preparation method thereof
CN115057641A (en) * 2022-06-30 2022-09-16 深圳市衡骏环保科技有限公司 Engineering waste soil-based regenerative functional aggregate and preparation method thereof

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KR101389528B1 (en) * 2012-09-07 2014-05-02 주식회사 컨앤폴리 Construction method of two-srory building using red clay brick
CN108046706A (en) * 2017-12-25 2018-05-18 北京首钢资源综合利用科技开发公司 A kind of external wall plastering dry mixed color mortar prepared using building waste
CN112608093A (en) * 2020-07-28 2021-04-06 厦门天润锦龙建材有限公司 Dry-mixed plastering mortar prepared from recycled aggregate and preparation method thereof
CN113402220A (en) * 2021-01-21 2021-09-17 山东科技大学 Application of waste clay brick powder in preparation of plastering mortar and preparation method thereof

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