Grading method of mechanism sand used for dry-mixed mortar, and prepared dry mixed mortar

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...

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

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