Mechanism sand dry-mixed mortar and preparation method thereof

Abstract

The invention discloses a mechanism sand dry-mixed mortar and a preparation method thereof, belonging to the technical field of building materials. According main points in a technical scheme of the invention, the mechanism sand dry-mixed mortar comprises the following components: cement, tailing sand, natural river sand, fly ash, a water-retaining thickener, redispersible latex powder, metakaolin, shell powder and a polycarboxylic acid water reducer. According to the invention, the tailing sand widely available is used as a main fine aggregate, and the compounding of the natural river sand and mechanism sand can make up for the problems of poor grading characteristics and grain shape defects of the mechanism sand; by strictly controlling the content of stone powder in the tailing sand, the processing properties of drying and grading of the tailing sand are improved; gaps in the dry-mixed mortar are filled in by the metakaolin and shell powder, so the compactness and impermeability ofthe hardened mortar are enhanced; the water-retaining and thickening properties of the dry-mixed mortar is improved through the water-retaining thickener; and the raw materials of the dry-mixed mortarare improved in dispersion uniformity and workability is improved, and the adhesion between the raw materials of the dry-mixed mortar is enhanced.

Description

technical field [0001] The invention relates to the technical field of building materials, more specifically, it relates to a machine-made sand dry-mixed mortar and a preparation method thereof. Background technique [0002] Construction mortar is an indispensable building material in civil engineering. Its consumption is large and its scope of use is second only to concrete. Traditional mortar is made by mixing cement, lime paste and sand with water at the construction site. Its disadvantages are: it requires a large area of ​​raw material stockpile, the mixing ratio is not accurately controlled, and the quality fluctuates greatly, which often causes building quality problems such as shelling and cracking, and causes dust pollution to the environment. Therefore, the quality of mortar cannot be effectively guaranteed. The waste of materials is serious, and the environmental protection problems are prominent, which seriously affects the quality of construction projects and bu...

AI Technical Summary

Problems solved by technology

Its disadvantages are: it requires a large area of ​​raw material stockpile, the mixing ratio is not accurately controlled, and the quality fluctuates greatly, which often causes building quality problems such as shelling and cracking, and causes dust pollution to the environment. Therefore, the quality of mortar cannot be effectively guaranteed. The waste of materials is serious, and environmental protection issues are prominent, seriously affecting the quality of construction projects and building functions

However, compared with river sand, machine-made sand has the following disadvantages: ①The machine-made sand produced by the traditional sand and gravel production line is generally long and flat; The modulus is too large; ②The gradation is unreasonable, and its gradation is characterized by more at both ends and less in the middle, that is, there are more particles above 1.18mm and below 0.6mm, and there are few particles between 0.6-1.18mm. If it replaces the natural sand in ordinary plastering mortar, the workability will be poor and it will be difficult to construct; ③The water absorption is higher than that of river sand and the water content is high. It can be used after drying, but because of its fineness, it is difficult to wet transport and dry; these all restrict the use of machine-made sand

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