Gypsum-based construction waste reclaimed sand plastering mortar and preparation method thereof

Abstract

The invention discloses a gypsum-based construction waste reclaimed sand plastering mortar and a preparation method thereof. The mortar is obtained in a way that water is added into mortar dry powder to be evenly stirred, wherein the mortar dry powder is prepared from the following raw materials in parts by weight: 20-50 parts of ardealite, 7-12 parts of coal ash, 3-5 parts of cement, 40-70 parts of construction waste reclaimed sand, 0.1-0.2 part of water-retaining thickener, 1-2 parts of water reducing agent and 0.1-0.3 part of retarder. The ardealite is taken as the main binding material of the mortar, and the construction waste reclaimed sand replaces a machine-made sand at a certain ratio; through formula regulation and additive adding, technical performances, including mortar strength, workability, construction performance and the like, can meet the requirements of the plastering mortar, the problem of the shortage of sand used for construction can be solved, and the pollution problem of solid wastes including the ardealite, the construction waste and the like can be solved.

Description

technical field [0001] The invention relates to the technical field of building materials, and specifically discloses a method for preparing plastering mortar for construction by using phosphogypsum as a cementitious material and replacing machine-made sand with recycled sand from construction waste. Background technique [0002] With the acceleration of industrialization and urbanization in our country, the construction industry has also developed rapidly, and the accompanying construction waste is increasing day by day. The amount of construction waste has accounted for 30%-40% of the total amount of urban waste. In 2014, my country's construction waste output reached more than 1.5 billion tons, and it is expected that by 2020, my country's construction waste output will reach its peak. The utilization rate of construction waste in my country is only 5%, the annual recycling rate of EU countries exceeds 90%, and the recycling rate of construction waste in South Korea and J...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a gypsum-based construction waste reclaimed sand plastering mortar and its preparation method. Phosphogypsum is used as the main cementing material of the mortar, and construction waste regenerated sand replaces machine-made sand according to a certain proportion. By adjusting the formula and Add admixtures to make the technical properties of mortar strength, workability and construction performance meet the requirements of plastering mortar, which can not only alleviate the shortage of construction sand, but also solve the pollution of solid waste such as phosphogypsum and construction waste, and achieve The purpose of turning waste into treasure and reducing the cost of mortar production