Light sand without burning and preparation method thereof

Abstract

The invention discloses light sand without burning and a preparation method thereof. The light sand without burning is prepared by the following steps: crushing aerated concrete leftover material or waste aerated concrete into particles, stirring cement, finely ground silicon-contained material and water storage material uniformly so as to prepare powder body material with canned surface; and spraying a surface modifier solution on the surfaces of aerated concrete particles, then canning the aerated concrete particles and the powder body into a ball, standing for one hour so as to conduct secondary canning to a ball, standing the formed spherical particle for 2-10h, and then pressurizing and evaporating the particle under the conditions of 80-190 DEG C and 1atm-15atm, thereby obtaining light particles with particle size being not more than 5mm, stacking density being not more than 1200kg / m3, cylinder pressure being more than 3.5MPa and water absorbing rate being not more than 5%. On the basis of saving production raw materials, the strength of the light aggregate can be improved effectively, and the water absorbing rate is reduced.

Description

technical field [0001] The invention belongs to the technical field of new building materials, and in particular relates to an unfired lightweight sand and a preparation method thereof. Background technique [0002] The heavy structure and poor thermal insulation performance are important obstacles to the development of ordinary concrete. Since the United States produced light aggregate shale ceramsite in 1913, the engineering community has begun to use light aggregate instead of ordinary sand and gravel aggregate. Reduce the weight of ordinary concrete, improve a series of properties such as concrete thermal insulation. Light aggregate has the advantages of light structure weight, good thermal insulation performance, energy saving and environmental protection, etc., making new building materials such as lightweight aggregate concrete hollow blocks, beams, and slabs made of it as raw materials widely used in high-rise buildings, long-span structural engineering, Wall materi...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of high-temperature calcination, high cost, and insufficient strength of light aggregates in the prior art, the present invention provides a non-fired light sand and its preparation method, which uses waste aerated concrete as raw material and does not require Calcining at high temperature can greatly increase the strength of light aggregate particles and significantly reduce the water absorption of light aggregate