A method of using waste stone powder to prepare self-leveling mortar

Abstract

The invention discloses a preparation method of self-leveling mortar using waste stone powder. The method includes: (1) proportioning raw materials, to be specific, proportioning raw materials including, by weight, 24% to 28% of ordinary Portland cement 42.5, 12% to 17% of high early strength cement, 8% to 12% of fly ash, 48% to 50% of fine river sand, 8% to 10% of the waste stone powder, 0.02% to 0.04% of thickener, 0.02% to 0.04% of early strength agent, 0.02% to 0.04% of defoaming agent, 0 .1% to 0.12% of retarder and 0.1% to 0.13% of water reducing agent, with the raw materials adding up 100%; (2) uniformly mixing the ordinary Portland cement, the high early strength cement, the fly ash, the waste stone powder and the fine river sand, adding sequentially the thickener, the early strength agent, the defoaming agent and the retarder, and stirring evenly; according to the water-binder ratio of 0.4, gradually adding water, performing stirring for 1 minute before adding the water reducing agent, performing uniform mixing and standing for 30 seconds, and then performing quick stirring for 1 minute to obtain the self-leveling mortar. The use of the method costs less, improves stability of the mortar, increases early strength of the mortar, and solves a large number of environmental problems caused by the waste stone powder.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for preparing self-leveling mortar by using waste stone powder. Background technique [0002] Self-leveling mortar is a dry-mixed powdery material composed of a variety of active ingredients. It can be used after mixing with water on site. After a little spreading with a scraper, a high-level base surface can be obtained. It has high early strength and can improve construction efficiency. It is suitable for Fine leveling of concrete floors and all flooring materials are widely used in civil and commercial buildings. [0003] At present, my country's self-leveling mortar technology is not yet fully mature, and it is still facing problems such as poor work performance, low early strength and low utilization rate of waste residue. At present, self-leveling mortar basically uses fine river sand as aggregate, and since river sand mining has caused serious environm...

AI Technical Summary

Problems solved by technology

However, waste stone powder is only used in ordinary mortar concrete, and self-leveling mortar is a special mortar with high fluidity, which is very easy to segregate and bleed. A lot of research basically adopts the method of increasing the specific gravity of fine powder materials or adding thickeners. Improve the consistency and solve the problem of segregation and bleeding. The fineness of waste stone powder can meet the requirements. It is a relatively fine powder with a significant thickening effect. When it is used in ordinary mortar, this effect cannot be fully exerted, but for self-leveling Mortar, the effect is very obvious

[0005] At present, there is no report on using waste stone powder instead of river sand to make self-leveling mortar