CN118084424A - Special high-cohesiveness mortar for aerated building blocks and preparation method thereof - Google Patents

Special high-cohesiveness mortar for aerated building blocks and preparation method thereof Download PDF

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Publication number
CN118084424A
CN118084424A CN202410183745.XA CN202410183745A CN118084424A CN 118084424 A CN118084424 A CN 118084424A CN 202410183745 A CN202410183745 A CN 202410183745A CN 118084424 A CN118084424 A CN 118084424A
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China
Prior art keywords
mortar
parts
powder
cohesiveness
aerated
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Application number
CN202410183745.XA
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Chinese (zh)
Inventor
张基勇
熊豪
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Zhejiang Yanxiang New Material Co ltd
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Zhejiang Yanxiang New Material Co ltd
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Priority to CN202410183745.XA priority Critical patent/CN118084424A/en
Publication of CN118084424A publication Critical patent/CN118084424A/en
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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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • 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
    • C04B2111/34—Non-shrinking or non-cracking materials
    • C04B2111/343—Crack resistant 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
    • C04B2201/50—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)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The application relates to the field of mortar, and particularly discloses high-cohesiveness mortar special for aerated building blocks and a preparation method thereof. The special high-cohesiveness mortar for the aerated building block comprises the following components in parts by weight: 90-110 parts of cement, 20-30 parts of filler, 550-570 parts of sand, 160-180 parts of water, 0.35-0.45 part of air entraining agent, 1.5-1.7 parts of additive and 14-18 parts of redispersible emulsion powder. The preparation method of the special high-cohesiveness mortar for the aerated building block comprises the following steps: adding water into cement, stirring uniformly, adding sand, stirring uniformly, adding filler, air entraining agent, additive and dispersible emulsion powder while stirring, and stirring uniformly. The mortar is used for aerated brickwork, has good water retention property, and can well avoid hollowing and cracking of a mortar layer; the mortar has good toughness, reduces the cracking generated after the mortar is dried and contracted, and has better permeation resistance.

Description

Special high-cohesiveness mortar for aerated building blocks and preparation method thereof
Technical Field
The application relates to the field of mortar, in particular to high-cohesiveness mortar special for aerated building blocks and a preparation method thereof.
Background
The autoclaved aerated concrete accurate building block can become a wall building material leader and has infinite development space. Because the autoclaved aerated concrete precise building block is of a porous structure and high in porosity, the weight of the autoclaved aerated concrete precise building block is reduced by 3/5 compared with that of a solid brick, so that the weight of a building is reduced, the energy consumption of the building is greatly reduced, the requirements of energy conservation, material reduction and environmental protection are completely met, in addition, the autoclaved aerated concrete precise building block also has the advantages of very good heat insulation and heat preservation effects, good fireproof performance and the like, and is a mainstream wall product developed in the current society.
The autoclaved aerated concrete accurate building block has higher porosity, water is added on the surface of the building block before ordinary mortar is used for masonry and plastering, the surface of the autoclaved aerated concrete accurate building block is still very dry, the water retention rate of ordinary mortar is lower, the autoclaved aerated concrete accurate building block quickly absorbs water in the ordinary mortar, the ordinary mortar is not matched with the autoclaved aerated concrete accurate building block, the adhesion of the mortar to the aerated building block is easy to be unstable, the wall surface of the autoclaved aerated building block is easy to be painted with hollows and cracks, the overall appearance of the building is influenced, the wall after hollows and cracks are more easily corroded by rainwater, the mortar layer is further shed, the safety of pedestrians and passing vehicles is threatened, the consumption of the mortar is also improved, and the energy consumption is high, and does not accord with the current trend of environmental protection requirements. Therefore, it is particularly important to develop a mortar with high adhesion suitable for aerated block.
Disclosure of Invention
In order to solve the problem of weak bonding of mortar to the aerated building block, the application provides the special high-bonding mortar for the aerated building block and a preparation method thereof.
In a first aspect, the application provides a special high-cohesiveness mortar for aerated building blocks, which adopts the following technical scheme:
The special high-cohesiveness mortar for the aerated building block comprises the following components in parts by weight: 90-110 parts of cement, 20-30 parts of filler, 550-570 parts of sand, 160-180 parts of water, 0.35-0.45 part of air entraining agent, 1.5-1.7 parts of additive and 14-18 parts of redispersible emulsion powder;
The filler is a composition of fly ash, heavy calcium powder, bentonite, talcum powder and asbestos powder.
By adopting the technical scheme, the filler is a composition of the fly ash, the heavy calcium powder, the bentonite, the talcum powder and the asbestos powder, the fly ash improves the water retention performance of the mortar, improves the lubricity and the plasticity of the mortar, so that the mortar is easier to construct and use, contains active substances such as silicate and the like, enhances the impermeability and the durability of the mortar, and reduces the possibility of cracking of a mortar layer.
The heavy calcium powder reduces the shrinkage of mortar and has better reinforcing effect. The bentonite can adsorb water to form a colloid substance, so that the viscosity of the mortar is increased, the construction is convenient, the water content of the mortar can be increased, the mortar is hydrated sufficiently, the bonding force of the mortar to aerated bricks is improved, the toughness of the mortar is also improved, and the mortar is prevented from cracking.
The talcum powder improves the compactness and crack resistance of the mortar, and the principles of the talcum powder such as surface charge and adsorption, can adsorb moisture and organic substances, improves the water content of the mortar, and improves the water-retaining property of the mortar. The asbestos powder reduces the cracking possibility of the coating, improves the water-retaining property of the mortar, improves the strength of the mortar, and simultaneously improves the bonding property of the mortar to brickwork.
Optionally, the weight ratio of the fly ash to the heavy calcium powder to the bentonite to the talcum powder to the asbestos powder is (11-13) (2.7-3.3) (0.9-1.1) (2.7-3.3) (5.4-6.6).
By adopting the technical scheme, under the proportion in the range, the mortar has the characteristics of strong bonding performance to the aerated building block, difficult cracking, good waterproof property, high strength and good toughness, and has excellent properties, thereby being suitable for bonding the aerated building block.
Optionally, the weight ratio of the fly ash to the heavy calcium powder to the bentonite to the talcum powder to the asbestos powder is 12:3:1:3:6.
By adopting the technical scheme, the mortar has better performance under the proportion.
Optionally, the additive is hydroxypropyl methylcellulose.
By adopting the technical scheme, the agent is hydroxypropyl methylcellulose with good water retention performance, effectively prevents the phenomena of strength reduction and cracking caused by too fast drying and insufficient hydration of mortar, has better thickening effect, and ensures that the mortar has strong bonding capability and good sagging performance.
Optionally, the CS air entraining agent reduces the density of the mortar, improves the sagging performance of the mortar and improves the yield of the mortar. The filler can reduce the shrinkage of the mortar, reduce the breadth influence of the air entraining agent on the mortar, and improve the toughness and the permeability resistance of the mortar.
In a second aspect, the application provides a preparation method of special high-cohesiveness mortar for aerated building blocks, which adopts the following technical scheme:
The preparation method of the special high-cohesiveness mortar for the aerated building block comprises the following steps: 100 parts of cement is added with 170 parts of water and then stirred uniformly, 560 parts of sand is added and stirred uniformly, and then 25 parts of filler, 0.4 part of air entraining agent, 1.6 parts of additive and 16 parts of dispersible emulsion powder are added and stirred uniformly.
By adopting the technical scheme, the mortar preparation method is simple, and the mortar preparation difficulty is reduced, so that the construction efficiency is improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. The composition of the fly ash, the heavy calcium powder, the bentonite, the talcum powder and the asbestos powder is used as the filler of the mortar, so that the mortar has high water content, good water retention and good sagging property, and the sagging property of the aerated building block is high, the surface of the aerated building block is used for the mortar without wetting the aerated building block by water in advance, the mortar can be directly brushed, the drop is low, the aerated building block does not need to be applied with water, the dryness of the aerated building block is small, and the important factors of cracking of a mortar layer are eliminated; meanwhile, the mortar has good water retention property, and the occurrence of hollowing and cracking of a mortar layer is well avoided; the mortar has good toughness, reduces the cracking generated after the mortar is dried and contracted, and has better permeation resistance.
Detailed Description
The present application will be described in further detail with reference to examples.
Raw material name
Shield stone cement brand silicate PO42.5 cement, river sand, hydroxypropyl methylcellulose, CS air entraining agent, 325 meshes of fly ash, 200 meshes of heavy calcium powder, 200 meshes of bentonite, 800 meshes of talcum powder and 60 meshes of asbestos powder; the re-dispersible emulsion powder is 80-100 meshes.
Examples
Example 1
The special high-cohesiveness mortar for the aerated building block comprises the following components in parts by weight: 90-110 parts of cement, 30 parts of filler, 570 parts of sand, 180 parts of water, 0.45 part of CS air entraining agent, 1.7 parts of hydroxypropyl methyl cellulose and 18 parts of redispersible emulsion powder;
The filler is a composition of fly ash, heavy calcium powder, bentonite, talcum powder and asbestos powder, and the weight ratio of the fly ash to the heavy calcium powder to the bentonite to the talcum powder to the asbestos powder is 18:2.5:7.6:1.5:3.7.
The preparation method of the special high-cohesiveness mortar for the aerated building block comprises the following steps: adding cement into a stirrer according to the required weight parts, adding water, stirring uniformly, adding sand, stirring uniformly, adding filler, air entraining agent, additive and dispersible emulsion powder while stirring, and stirring uniformly.
Example 2
The special high-cohesiveness mortar for the aerated building block comprises the following components in parts by weight: 90 parts of cement, 20 parts of filler, 550 parts of sand, 160 parts of water, 0.35 part of CS air entraining agent, 1.5 parts of hydroxypropyl methyl cellulose and 14 parts of redispersible emulsion powder;
The filler is a composition of fly ash, heavy calcium powder, bentonite, talcum powder and asbestos powder, and the weight ratio of the fly ash to the heavy calcium powder to the bentonite to the talcum powder to the asbestos powder is 6.4:8.2:0.4:5.1:2.6.
The preparation method of the special high-cohesiveness mortar for the aerated building block comprises the following steps: adding cement into a stirrer according to the required weight parts, adding water, stirring uniformly, adding sand, stirring uniformly, adding filler, air entraining agent, additive and dispersible emulsion powder while stirring, and stirring uniformly.
Example 3
The special high-cohesiveness mortar for the aerated building block comprises the following components in parts by weight: 100 parts of cement, 25 parts of filler, 560 parts of sand, 170 parts of water, 0.4 part of CS air entraining agent, 1.6 parts of hydroxypropyl methyl cellulose and 16 parts of redispersible emulsion powder;
the filler is a composition of fly ash, heavy calcium powder, bentonite, talcum powder and asbestos powder, and the weight ratio of the fly ash to the heavy calcium powder to the bentonite to the talcum powder to the asbestos powder is 3.6:4.8:0.6:8.4:5.5.
The preparation method of the special high-cohesiveness mortar for the aerated building block comprises the following steps: adding cement into a stirrer according to the required weight parts, adding water, stirring uniformly, adding sand, stirring uniformly, adding filler, air entraining agent, additive and dispersible emulsion powder while stirring, and stirring uniformly.
Example 4
The difference from example 3 is that the weight ratio of fly ash, heavy calcium powder, bentonite, talcum powder and asbestos powder is 11:2.9:0.9:2.7:5.4.
Example 5
The difference with example 3 is that the weight ratio of fly ash, heavy calcium powder, bentonite, talcum powder and asbestos powder is 13:3.3:1.1:3.3:6.6.
Example 6
The difference with example 3 is that the weight ratio of fly ash, heavy calcium powder, bentonite, talcum powder and asbestos powder is 12:3:1:3:6.
Comparative example
Comparative example 1
The difference from example 6 is that the filler is added in an amount of 40 parts.
Comparative example 2
The difference from example 6 is that the filler is added in an amount of 10 parts.
Comparative example 3
The difference from example 6 is that no filler is added.
Comparative example 4
The difference from example 6 is that bentonite is not included in the filler.
Comparative example 5
The difference from example 6 is that the filler does not contain fly ash, heavy calcium powder, talcum powder and asbestos powder.
Performance test
Preparation of mortar test pieces experiments are carried out according to JGJ/T70-2009 building mortar basic performance test method standard, and the preparation specification of mortar compression test pieces is 70.7mm, and experimental equipment is as follows: 20KN electronic universal tester.
Mortar bond strength test was performed according to masonry mortar and plaster mortar for autoclaved aerated concrete (JC 890-2001), experimental facility: bond strength pullout instrument.
Determination of Water retention according to JGJ/T70 standard of basic Performance test method for construction mortar, experimental facilities: 100 x 25 mortar water retention rate tester.
TABLE 1
It can be seen from the combination of examples 1 to 3 and comparative examples 1 to 3 and the combination of table 1 that the water retention of mortar is remarkably improved, and at the same time the adhesion of mortar to aerated blocks is also improved, and at the same time the strength of mortar is improved, by adding a composition formed of fly ash, ground calcium carbonate, bentonite, talc powder, and asbestos powder.
It can be seen from the combination of examples 1-3 and examples 4-6 and the combination of Table 1 that the components in the filler are different, the improvement of each performance of the mortar is different, and when the weight ratio of the fly ash, the heavy calcium powder, the bentonite, the talcum powder and the asbestos powder is 12:3:1:3:6, the strength, the cohesiveness and the water retention performance of the mortar are optimal.
As can be seen from the combination of example 6 and comparative examples 3 to 5 and the combination of table 1, when bentonite is added, the improvement of mortar strength and bonding performance is not obvious, but when the filler is added from the combination of fly ash, heavy calcium powder, bentonite, talcum powder and asbestos powder, the synergistic effect is achieved, so that a small amount of bentonite can play a strong role, the strength and bonding performance of the mortar are greatly improved, the reason is probably that calcium ions in the bentonite and calcium carbonate are subjected to ion exchange to generate calcareous bentonite, the thickness of a Diffusion Double Layer (DDL) in the bentonite is reduced, the free water flowing space is increased, but the compression deformation of the mortar is weakened, and the mortar strength is greatly improved; meanwhile, the calcium bentonite can improve the cohesiveness with the aerated building block, so that the cohesiveness strength is improved.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.

Claims (6)

1. The special high-cohesiveness mortar for the aerated building block is characterized by comprising the following components in parts by weight: 90-110 parts of cement, 20-30 parts of filler, 550-570 parts of sand, 160-180 parts of water, 0.35-0.45 part of air entraining agent, 1.5-1.7 parts of additive and 14-18 parts of redispersible emulsion powder;
The filler is a composition of fly ash, heavy calcium powder, bentonite, talcum powder and asbestos powder.
2. The aerated block specific high adhesion mortar of claim 1, wherein: the weight ratio of the fly ash to the heavy calcium powder to the bentonite to the talcum powder to the asbestos powder is (11-13) (2.7-3.3) (0.9-1.1) (2.7-3.3) (5.4-6.6).
3. The aerated block specific high adhesion mortar of claim 1, wherein: the weight ratio of the fly ash to the heavy calcium powder to the bentonite to the talcum powder to the asbestos powder is 12:3:1:3:6.
4. The aerated block specific high adhesion mortar of claim 1, wherein: the additive is hydroxypropyl methylcellulose.
5. The aerated block specific high adhesion mortar of claim 1, wherein: the air entraining agent is CS air entraining agent.
6. A method for preparing the special high-cohesiveness mortar for aerated building blocks according to any one of claims 1 to 5, which is characterized by comprising the following steps: 100 parts of cement is added with 170 parts of water and then stirred uniformly, 560 parts of sand is added and stirred uniformly, and then 25 parts of filler, 0.4 part of air entraining agent, 1.6 parts of additive and 16 parts of dispersible emulsion powder are added and stirred uniformly.
CN202410183745.XA 2024-02-19 2024-02-19 Special high-cohesiveness mortar for aerated building blocks and preparation method thereof Pending CN118084424A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410183745.XA CN118084424A (en) 2024-02-19 2024-02-19 Special high-cohesiveness mortar for aerated building blocks and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410183745.XA CN118084424A (en) 2024-02-19 2024-02-19 Special high-cohesiveness mortar for aerated building blocks and preparation method thereof

Publications (1)

Publication Number Publication Date
CN118084424A true CN118084424A (en) 2024-05-28

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Country Status (1)

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