Premixed dry mortar

Abstract

The invention relates to a building material technology, in particular to a concrete premix. A premixed dry mortar is prepared by mainly mixing the components of 12-25 percent of cement, 3-4 percent of pulverized fuel ash, 32-50 percent of yellow sand, 2.7-3.4 percent of mortar thickening powder and 0-0.05 percent of additive. The premixed dry mortar is characterized in that sodium silicate casting used sand is added in the main components. The invention solves the problem of larger consumption of the yellow sand in the traditional premixed dry mortar.

Description

technical field [0001] The invention relates to building material technology, in particular to a premixed material for concrete. Background technique [0002] Foundry used sand can be divided into three types: green mold used sand, resin used sand and water glass used sand. But as far as old sand regeneration is concerned, it is relatively difficult. The discarded old sand is alkaline, and there is no grass in the place where it is dumped. In addition, there is a relative shortage of high-quality quartz sand resources in my country. If the old sand is not comprehensively utilized and discarded in large quantities, it will be a great waste of limited resources and cause serious environmental pollution. China is the largest country in the world's foundry industry. In 2008, the annual output of castings in my country reached more than 30 million tons, accounting for 40% of the world's output. The amount of old sand discarded in the country is more than 30 million tons a year, ...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned defects, the technical problem to be solved in the present invention is to provide a dry powder mortar with a small amount of yellow sand in view of the problem that the yellow sand used in the existing dry powder mortar is relatively large.

Images