Full-machine-made sand masonry mortar taking limestone as aggregate and preparation method thereof

Abstract

The invention discloses full-machine-made sand masonry mortar taking limestone as aggregate and a preparation method of the full-machine-made sand masonry mortar. The full-machine-made sand masonry mortar taking limestone as the aggregate is prepared from the following components in parts by weight: 130 to 150 parts of cement, 720 to 790 parts of limestone machine-made sand, 100 to 150 parts of limestone powder, 0.2 to 0.25 part of cellulose ether and 0.005 to 0.02 part of an air entraining agent, wherein the limestone machine-made sand and the limestone powder are prepared by crushing high-calcium stones, the fineness modulus of the limestone machine-made sand is 2.5, and the fineness modulus of the limestone powder is 0.07. The full-machine-made sand masonry mortar with limestone as theaggregate has the advantages of being good in workability, small in bleeding amount, capable of relieving shortage of natural sand resources due to the fact that limestone tailings serve as machine-made sand, good in heat preservation and insulation effect and durable.

Description

technical field [0001] The invention relates to the technical field of building materials, more specifically, it relates to a fully machine-made sand masonry mortar with limestone as aggregate and a preparation method thereof. Background technique [0002] Masonry mortar is the mortar that binds bricks, stones, blocks, etc. into masonry. It is called masonry mortar. It plays the role of transferring load and is an important part of masonry. At present, dry-mixed masonry mortar is mainly prepared in a certain proportion with cement, natural sand, admixtures and other admixtures. [0003] In the prior art, the Chinese invention patent application document with the application number 201611043807.9 discloses a high-strength dry-mix masonry mortar and its preparation method, which is made of the following raw materials in parts by weight: Portland cement 100-150 parts, modified 20-30 parts of ground stone powder, 10-20 parts of blast furnace slag, 10-20 parts of iron ore tailin...

AI Technical Summary

Problems solved by technology

[0004] The existing dry-mixed masonry mortar uses river sand as aggregate, because river sand belongs to natural sand, and natural sand is a local resource, which has the characteristics of uneven distribution, non-renewable in a short time, and unsuitable for long-distance transportation, etc. Characteristics, at present, due to over-exploitation and other reasons in many areas of our country, natural sand resources are close to exhaustion. At present, many places have begun to ban or limit the mining of natural sand, which has led to the increasingly prominent contradiction between supply and demand of sand used in engineering construction. Therefore, the use of machine-made sand The sustainable development of replacing natural sand for dry-mixed masonry mortar has become a green and feasible development trend

[0005] However, due to the uneven particles and many internal pores of the machine-made sand, adding it to the dry-mixed masonry mortar will lead to an increase in the water demand of the mortar, a decrease in the consistency of the mortar, and bleeding, etc., so it is rarely used in the dry-mixed mortar

On the other hand, a large number of piled limestone tailings not only cause serious pollution to air, water and soil, but also occupy a large amount of agricultural land. Therefore, it is necessary to study how to make limestone tailings into machine-made sand and solve the problems caused by machine-made sand. The problems of large bleeding and workability deviation of mortar

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