CN106830748B - Plastering mortar additive and preparation method thereof - Google Patents

Plastering mortar additive and preparation method thereof Download PDF

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Publication number
CN106830748B
CN106830748B CN201710211632.6A CN201710211632A CN106830748B CN 106830748 B CN106830748 B CN 106830748B CN 201710211632 A CN201710211632 A CN 201710211632A CN 106830748 B CN106830748 B CN 106830748B
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China
Prior art keywords
percent
plastering mortar
mortar
admixture
fly ash
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Expired - Fee Related
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CN201710211632.6A
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CN106830748A (en
Inventor
杨玉生
刘小生
赵剑明
汪小刚
温彦锋
刘启旺
王龙
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China Institute of Water Resources and Hydropower Research
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China Institute of Water Resources and Hydropower Research
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Priority to CN201710211632.6A priority Critical patent/CN106830748B/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
    • 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
    • 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
    • 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

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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 invention relates to the technical field of mortar admixtures, and discloses a plastering mortar admixture and a preparation method thereof. The invention comprises the following components in percentage by weight: 84 to 92 percent of mineral admixture, 2.8 to 5 percent of air entraining agent, 0.7 to 3 percent of adhesive, 2.5 to 8 percent of water-retaining agent and 1 to 3 percent of anti-crack fiber; the mineral admixture consists of fly ash and slag powder, and the mass ratio of the fly ash to the slag powder is 3-5: 1. the plastering mortar has simple components, low cost and comprehensive functions, can effectively improve the toughness and strength of the plastering mortar, and avoids the problems of cracking, shrinkage and the like of the plastering mortar.

Description

plastering mortar additive and preparation method thereof
Technical Field
The invention relates to the technical field of mortar admixtures, in particular to a plastering mortar admixture and a preparation method thereof.
Background
Most northern areas in China are arid and rainless, and large-scale irrigation area engineering construction is carried out in arid and semiarid areas for developing agricultural production, such as western juniper irrigation areas of Jilin, Ningxia yellow river irrigation areas, Gansu river irrigation areas and the like. However, due to the cold and dry condition in northern areas, the plastering mortar used in the construction process of the channel is easy to crack and shrink due to poor water retention.
The plastering mortar is generally composed of silicate series cement, sand, water and the like, is a brittle material, has the problems of high compressive strength, low tensile strength, poor toughness, easy cracking and large shrinkage caused by poor water retention and the like, and greatly limits the popularization and application of the plastering mortar in irrigation works in northern areas.
At present, functional additives are added to improve the performance of mortar and improve the toughness and strength of the mortar. The existing mortar admixtures are various, but the existing mortar admixtures can not solve the problems existing in plastering mortar, and although the general mortar admixtures can temporarily solve the problems of cracking, shrinkage, low strength, poor toughness and the like of the plastering mortar, the phenomena of cracking, gaps and ash falling caused by overlarge water-cement ratio can still occur after later-stage condensation. The conventional mortar admixture has the defects of multiple formula components, high cost, no pertinence, incomplete performance improvement, complex use process and difficult control, and the interaction among various additives added by autonomous operation cannot be controlled, so that the conventional mortar admixture is lack of normative constraint and has strong dependence on personnel experience.
disclosure of Invention
The plastering mortar admixture provided by the invention has the advantages of simple components, low cost and comprehensive functions, can effectively improve the toughness and strength of plastering mortar, and avoids the problems of cracking, shrinkage and the like of plastering mortar.
The technical problem to be solved is that: at present, no additive is used for plastering mortar, and the problems of cracking, shrinkage, low strength, poor toughness and the like of the plastering mortar cannot be effectively solved by common mortar additives.
In order to solve the technical problems, the invention adopts the following technical scheme:
The plastering mortar admixture comprises the following components in percentage by weight: 84 to 92 percent of mineral admixture, 2.8 to 5 percent of air entraining agent, 0.7 to 3 percent of adhesive, 2.5 to 8 percent of water-retaining agent and 1 to 3 percent of anti-crack fiber; the mineral admixture consists of fly ash and slag powder, and the mass ratio of the fly ash to the slag powder is 3-5: 1.
The plastering mortar additive is characterized in that the mass ratio of the fly ash to the slag powder is 4: 1.
The plastering mortar additive further comprises 45-53 mass percent of SiO in the fly ash227-32% of Al2O35-6% of Fe2O3And 4-4.2% CaO.
The plastering mortar admixture of the invention further comprises an air entraining agent which is sodium fatty alcohol polyoxyethylene ether sulfate.
The plastering mortar additive is characterized in that the adhesive is vinyl acetate-ethylene copolymer latex powder.
The plastering mortar admixture of the invention further comprises a water retention agent which is hydroxypropyl methyl cellulose ether and/or starch ether, and the viscosity is more than 15000 mPa.s.
The plastering mortar additive is characterized in that the anti-crack fibers are a mixture of two or more than two polypropylene short fibers with the following longitudinal surface forms, wherein the fibers are A bunched, B wavy and C spiral, and the two ends of the fibers are provided with screw threads.
The preparation method of the plastering mortar additive comprises the following steps:
Step one, preparing materials: preparing the following components in percentage by weight:
84 to 92 percent of mineral admixture, 2.8 to 5 percent of air entraining agent, 0.7 to 3 percent of adhesive, 2.5 to 8 percent of water-retaining agent and 1 to 3 percent of anti-crack fiber; the mineral admixture consists of fly ash and slag powder, and the mass ratio of the fly ash to the slag powder is 3-5: 1;
Step two, mixing: adding an air entraining agent into the mineral admixture, uniformly stirring, then adding a binder, a water-retaining agent and anti-crack fibers, and uniformly stirring to prepare powder.
The application method of the plastering mortar admixture is added into the dry-mixed mortar according to the proportion, and the adding proportion is 1-2% of the mortar cementing material.
Compared with the prior art, the plastering mortar additive has the following beneficial effects:
The plastering mortar additive disclosed by the invention is used by matching the fly ash and the slag powder, and combines the spherical physical property and the volcanic ash activity of the fly ash with the fineness and the activity of the slag powder, so that the fly ash is used as a carrier, functional additives and anti-cracking fibers in the additive are well dispersed, the production process of the additive is simplified, the performance of the additive is more stable, and the basic performance of the plastering mortar can be effectively improved. The fly ash and the slag powder provided by the invention are added into the mortar according to the use ratio, so that the wear resistance and the durability are better. Short fibers with different surface forms are introduced into the plastering mortar admixture to serve as anti-cracking fibers, and the plastering mortar admixture is used in a matching manner in different forms, so that the toughness and anti-cracking performance of the cement mortar are improved, the abrasion loss of the plastering mortar is improved, the problems of cracking, shrinkage, low strength and poor toughness of the plastering mortar are effectively solved, and the construction stability is guaranteed. The invention is suitable for plastering buildings and building blocks as well as plastering internal and external walls and ceilings of the buildings, and has wide application range.
Detailed Description
Preparation examples
The plastering mortar admixture of the present invention was prepared as follows;
The preparation method comprises the following steps of preparing materials according to the components shown in the table 1 and the table 2, adding an air entraining agent into a mineral admixture, uniformly stirring, adding a binder, a water-retaining agent and anti-crack fibers, and uniformly stirring to prepare powder.
Table 1 weight percentages of the raw material components in the preparation examples
The types and the dosage ratios of the anti-crack fibers are shown in table 2.
(percent by mass) Preparation example 1 Preparation example 2 Preparation example 3 Preparation example 4
A bundle shape 100 70 50 60
b wave shape 30 20 10
C helix shape 30 20
D both ends are threaded 10
The plastering mortar admixture prepared in the preparation example is added into dry-mixed mortar in a proportion of 1-2% of mortar gel material, the mortar gel material is 18% of cement, 71.5% of fine sand and 10.5% of water, wherein the cement is commercially available P.O42.5R ordinary portland cement.
The obtained plastering mortar is subjected to basic performance index test according to the relevant regulations in JGJ/T70-2009 'building mortar basic performance test method standard', and the specific results are shown in Table 3.
Table 3 basic performance test results using the plastering mortars of the preparation examples
Preparation example 1 Preparation example 2 Preparation example 3 preparation example 4
The water reduction rate% 8.2 9.7 10.7 11.5
Setting time h 8 7 6 5
28d compressive strength MPa 13.5 12.4 13.9 14.8
14d tensile bond strength MPa 0.68 0.58 0.71 0.76
Shrinkage of 28 d% 0.62 0.64 0.56 0.59
Percent loss of freeze-thaw strength for 50 times% 17.4 17.8 16.5 16.8
As can be seen from Table 3, the mortar ratio in the general plastering mortar is 1:3, the water cement ratio is 0.8, the plastering mortar admixture prepared by the invention has the mortar ratio in the mixed plastering mortar of 1:4 and the water cement ratio of 0.6, thereby greatly reducing the using amount of cement, reducing the water cement ratio and improving the water retention of the mortar; the prepared plastering mortar has better bonding strength, toughness and frost resistance.
Comparative example 1
the plastering mortar admixture prepared in the above preparation example 1 was set as an experimental group 1, and 5 control groups were set at the same time. The reference group 1 does not use slag powder, only uses fly ash, and the other components and the using amount are completely the same as those of the preparation example 1; the control group 2 does not use fly ash, only uses slag powder, and the other components and the using amount are completely the same as those of the preparation example 1; the mass ratio of the fly ash to the slag powder used in the control groups 3-5 is 7: 1. 1: 1 and 1:3, the other components and the use amount are completely the same as the preparation example 1.
The control and preparation example 1 were mixed in the same manner and were each incorporated in a dry-mixed mortar in an amount of 1.5%. The basic performance indexes of the obtained plastering mortar are tested, and the specific results are shown in table 4.
Table 4 basic performance test results of the plastering mortar obtained in comparative example 1
Experimental group 1 Control 1 control 2 Control 3 Control 4 Control 5
The water reduction rate% 8.2 5.2 6 7.8 7.6 8.5
28d compressive strength MPa 13.5 8.6 9.2 10.5 9.8 11.4
Abrasion loss kg/m2 3.6 5.2 5.1 4.3 4.1 4.2
Percent loss of freeze-thaw strength for 50 times% 17.4 20.1 21.6 18.2 18.4 18.9
As can be seen from table 4, the comparison group 1 and the comparison group 2 using the fly ash or the slag powder alone have the mortar water-reducing rate of 5-6%, which is obviously lower than that of the other groups used in combination, and the fly ash and the slag powder are used in combination, so that the compactness, the fluidity and the plasticity of the mortar can be effectively improved, the water content of the mortar is reduced, bleeding and segregation are reduced, the loss of fluidity is reduced, and the fluidity and the cohesiveness of the mortar are improved; the compression strength of the mixed mortar is obviously better than that of the mortar used alone, and the plastering mortar has better wear resistance and durability.
The fly ash and the slag powder are mixed according to different proportions, and the effect is greatly different. The fly ash is spherical particles of several microns to several hundred microns, is a typical non-homogeneous substance, and can be used as a carrier by being mixed with slag powder with enough fineness and activity due to the spherical physical property and the volcanic ash activity of the fly ash, so that the functional auxiliary agent and anti-crack fibers in the additive are well dispersed, the production process of the additive is simplified, the performance of the additive is more stable, and the basic performance of the plastering mortar can be effectively improved.
Compared with a control group 3-a control group 5, the plastering mortar added with the additive in the preparation example 1 has the advantages that the compressive strength is improved by 20-30%, the loss rate of the freeze-thaw strength is reduced by 5-10%, and the abrasion loss is reduced by 12-17%.
Comparative example 2
The plastering mortar admixture prepared in the preparation example 2 was set as an experimental group 2, and 4 control groups were set. The anti-crack fibers with single surface morphology used in the control groups 6 to 9 respectively have the longitudinal surface morphology of A bundle, B wave and C spiral, the two ends of D are provided with screw threads, the fiber length is 5 to 10mm, and the other components and the use amount are completely the same as those in the preparation example 3.
The control and preparation example 3 were mixed in the same manner and were each incorporated in a dry-mixed mortar at an addition rate of 2%. The basic performance indexes of the obtained plastering mortar are tested, and the specific results are shown in table 5.
Table 5 results of basic property test of the plastering mortar obtained in comparative example 2
Experimental group 2 control 6 Control 7 Control 8 Control 9
The water reduction rate% 9.7 8.5 8.3 8.4 8.5
28d compressive strength MPa 12.4 13.2 12.8 12.8 13.1
Abrasion loss kg/m2 3.8 4.3 4.5 4.3 4.4
Percent loss of freeze-thaw strength for 50 times% 17.8 17.6 18.1 17.8 17.7
14d tensile bond strength MPa 0.58 0.49 0.52 0.54 0.51
As can be seen from Table 5, the experimental group 2 using the plastering mortar admixture of the present invention has a certain improvement in tensile bond strength, and the abrasion loss of the obtained plastering mortar is effectively reduced by 10-15% as compared with the mortar obtained by other control groups; therefore, the short fibers with different surface forms are reasonably combined, so that various basic performances of the plastering mortar can be improved, the problems of cracking, shrinkage, low strength and poor toughness of the plastering mortar are effectively solved, and the construction stability is guaranteed.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.

Claims (5)

1. the plastering mortar additive is characterized in that: the paint consists of the following components in percentage by weight: 84 to 92 percent of mineral admixture, 2.8 to 5 percent of air entraining agent, 0.7 to 3 percent of adhesive, 2.5 to 8 percent of water-retaining agent and 1 to 3 percent of anti-crack fiber; the mineral admixture is composed of fly ash and slag powder, and the mass ratio of the fly ash to the slag powder is 4: 1; the anti-crack fiber is a mixture of two or more than two polypropylene short fibers with the following longitudinal surface forms, wherein A is in a bundle shape, B is in a wave shape, C is in a spiral shape, and the two ends D are provided with screw threads; the plastering mortar admixture is added into the dry-mixed mortar according to the proportion of 1-2% of the mortar cementing material, and the air entraining agent is sodium fatty alcohol-polyoxyethylene ether sulfate.
2. the plastering mortar admixture according to claim 1, wherein: the fly ash contains SiO with the mass percent of 45-53%227-32% of Al2O35-6% of Fe2O3And 4-4.2% CaO.
3. The plastering mortar admixture according to claim 1, wherein: the binder is vinyl acetate-ethylene copolymer latex powder.
4. The plastering mortar admixture according to claim 1, wherein: the water retention agent is hydroxypropyl methyl cellulose ether and/or starch ether, and the viscosity is greater than 15000 mPa.s.
5. The method for preparing the plastering mortar admixture of any one of claims 1 to 4, wherein: the method comprises the following steps:
Step one, preparing materials: preparing the following components in percentage by weight:
84 to 92 percent of mineral admixture, 2.8 to 5 percent of air entraining agent, 0.7 to 3 percent of adhesive, 2.5 to 8 percent of water-retaining agent and 1 to 3 percent of anti-crack fiber; the mineral admixture is composed of fly ash and slag powder, and the mass ratio of the fly ash to the slag powder is 4: 1;
Step two, mixing: adding an air entraining agent into the mineral admixture, uniformly stirring, then adding a binder, a water-retaining agent and anti-crack fibers, and uniformly stirring to prepare powder.
CN201710211632.6A 2017-03-31 2017-03-31 Plastering mortar additive and preparation method thereof Expired - Fee Related CN106830748B (en)

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CN101891431B (en) * 2010-07-08 2013-05-08 深圳广田装饰集团股份有限公司 Light energy-saving plastering mortar and construction method thereof
CN105777025B (en) * 2016-03-09 2018-01-12 武汉理工大学 A kind of light thermal-insulation early-strength cement-based floor self-leveling material and preparation method thereof

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