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Grading method of machine-made sand for dry-mixed mortar and prepared dry-mixed mortar

A technology for dry-mixed mortar and machine-made sand, applied in the field of construction mortar, can solve the problems of unstable quality, gradation, powder content in sand, soil powder content and moisture that cannot be controlled within the standard range, and achieves good workability. , The effect of improving bond strength and toughness

Active Publication Date: 2020-11-24
章丘华明水泥新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the existing machine-made sand quality and unstable gradation, and the powder content, soil powder content and water content in the sand cannot be controlled within the standard range, the present invention provides a gradation method and preparation of machine-made sand for dry-mixed mortar dry mix mortar

Method used

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  • Grading method of machine-made sand for dry-mixed mortar and prepared dry-mixed mortar
  • Grading method of machine-made sand for dry-mixed mortar and prepared dry-mixed mortar
  • Grading method of machine-made sand for dry-mixed mortar and prepared dry-mixed mortar

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1, the gradation design of machine-made sand

[0034] In the present invention, the medium sand in the machine-made sand, that is, the part below 4.75mm and the fineness modulus between 2.3-3.0, is screened again into three kinds of coarse, medium and fine sands, wherein the fineness modulus of the coarse sand is 4.3-4.6, The fineness modulus of medium sand is 3.7-4.0, and the fineness modulus of fine sand is 1.4-1.7.

[0035] Specifically, according to the gradation method of machine-made sand for dry-mixed mortar of the present invention, the gradation design of machine-made sand is shown in Table 1 below:

[0036] Table 1 Gradation design of machine-made sand (particle size unit: mm)

[0037]

[0038] Among them, the fine sand gradation below 0.15 has a powder content of 26% to 32%.

Embodiment 2

[0039] Embodiment 2, the preparation and performance detection of admixture

[0040] The admixture used in the present invention is prepared from cellulose ether, vinyl acetate homopolymer powder (PVAC), starch ether, polysiloxane, and polycarboxylic acid in a ratio of 50:32:1.4:12.6:4.

[0041] Preparation method: Take 50 parts of cellulose ether, 32 parts of vinyl acetate homopolymer powder (PVAC), 1.4 parts of starch ether, 12.6 parts of polysiloxane, and 4 parts of polycarboxylic acid, put them into the mixer and mix them for 30 minutes, then pack them in 25Kg Bag and ready to use.

[0042] The admixture of the present invention (experimental group) and the conventional single admixture HPMC (control group) were used to prepare dry-mixed mortar. Except for the admixture, the other components and dosages of the two dry-mixed mortars DPM5 were the same. The performance comparison of the two mortars is shown in Table 4 below.

[0043] Table 4 Performance comparison of dry-m...

Embodiment 3

[0046] Embodiment 3, different types of dry-mixed mortar formulations and properties prepared by the inventive method

[0047] The formula is shown in Table 2. The machine-made sand used in each type of dry-mixed mortar adopts the gradation in Table 1 of Example 1, and the admixture in Example 2 is used as the admixture.

[0048] Table 2 Formulas of different types of dry-mixed mortar (unit: kg)

[0049] cement fly ash coarse sand Middle sand fine sand Admixture DMM5 100 50 210 40 600 0.37 DMM7.5 110 50 290 / 550 0.39 DMM10 130 50 310 / 510 0.40 DPM5 110 50 / 410 430 0.40 DPM10 130 50 / 430 390 0.44 DPM15 150 50 / 450 350 0.48 DPM20 170 50 / 470 310 0.50

[0050] Among them, the preparation of plastering mortar (DPM) first determines the amount of cement and fly ash in the plastering mortar according to the test ratio. The powder content of the particle size below 0.15 is com...

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Abstract

The invention relates to a grading method of mechanism sand used for dry-mixed mortar, and the prepared dry-mixed mortar. The grading method of the mechanism sand used for the dry-mixed mortar comprises the step of sieving the mechanism sand part, which has the particle size of 4.75mm or less and the fineness modulus of 2.3-3.0, into three types of sand, i.e., coarse sand, medium sand and fine sand, wherein the fineness modulus of the coarse sand is 4.3-4.6, the fineness modulus of the medium sand is 3.7-4.0, and the fineness modulus of the fine sand is 1.4-1.7. Furthermore, the dry-mixed mortar is prepared according to a grading formula of the mechanism sand; the ratio of the two or three types of sand in the dry-mixed mortar is adjusted according to the variety of the mortar. The contentof powder with the particle size of less than 0.15 is controlled, so that the powder content of dry-mixed plastering mortar (DPM) can be further effectively controlled; the fineness modulus of dry-mixed masonry mortar (DMM) is 2.3-2.6; the powder content of the DPM is controlled to be within a range of 26-30%, and the fineness modulus of the finished product mortar is controlled to be within a range of 2.1-2.3. The quality of the mortar is guaranteed. By combining the use of a composite additive, the construction performance of the mortar is greatly improved, and the quality of the mortar isguaranteed.

Description

technical field [0001] The invention belongs to the field of building mortar, and in particular relates to a method for grading machine-made sand for dry-mixed mortar and the prepared dry-mixed mortar. Background technique [0002] Mortar is a widely used material in construction engineering, and is widely used in masonry structures, reinforced concrete structures and other projects. Dry-mixed mortar, also known as dry-mixed mortar, refers to the selection of quantitative aggregates, fine aggregates, quantitative cementitious materials (such as cement) and special performance admixtures in a certain proportion and mixed into bulk or bagged finished mortar. Transported to the construction site, the dry-mixed mortar is mixed with water and used, with good workability and stable quality. [0003] The aggregates and fine aggregates used in dry-mixed mortar, that is, sand, are divided into natural sand and machine-made sand, with a particle size below 4.75mm and a fineness modul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B14/06
CPCC04B28/00C04B2201/50C04B14/06C04B18/08C04B24/383C04B24/38C04B24/42C04B24/26C04B24/283
Inventor 杨永华
Owner 章丘华明水泥新型建材有限公司
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