Autoclaved aerated concrete block produced from sludge and carbide slag

Abstract

The invention relates to an autoclaved aerated concrete block prepared by using sludge and carbide slag, which belongs to the field of environmental protection and the field of building materials. The raw materials and various raw materials required for preparing the autoclaved aerated concrete block are proportioned by weight percentage as calcium carbide slag 25-45%, sludge 25-35%, silica sand 15-30%, and cement clinker 6-12%. , 3-6% of natural gypsum ingredients, plus 0.6-0.9% of the total mass of the above mixed dry material water reducing agent, 0.06%-0.12% of aluminum powder and 35%-45% of 48 ℃ ~ 55 ℃ warm water. The wet compressive strength of the aerated concrete block prepared by the present invention reaches more than 3.5MPa, the absolute dry compressive strength reaches more than 5MPa, and the dry bulk density is 550kg / m3~650kg / m3, which meets the national standard for autoclaved aerated concrete masonry. According to the requirements of block performance indicators, it opens up a new way of utilization for the difficult-to-use sludge and carbide slag resources, which is conducive to solving the problems of sludge and carbide slag stockpiling occupying land resources and polluting the environment.

Description

technical field [0001] The invention belongs to the fields of environmental protection and wall materials, and in particular relates to an autoclaved aerated concrete block prepared from sludge and carbide slag. Background technique [0002] Autoclaved aerated concrete block is currently the only single wall material that can achieve 50% building energy saving. It has the characteristics of light weight, heat preservation, heat insulation, sound absorption, fire prevention, and easy processing. In view of these characteristics, under the background that the country prohibits the use of clay bricks, autoclaved aerated concrete blocks are occupying a growing market as wall materials. At present, there are mainly air concrete products prepared by two raw material systems of lime_cement_sand and lime_cement_fly ash in circulation in the market in our country. Because it plays an important role in the field of concrete and its supply is becoming increasingly tense, it is bound t...

AI Technical Summary

Problems solved by technology

The added value of the above-mentioned building materials is relatively low, which limits the transportation distance of the product, and makes it difficult for carbide slag to be consumed and utilized in large quantities

In addition, calcium carbide slag contains high magnesium and is used to prepare cement products or lime-sand bricks, and its durability is difficult to guarantee

[0005] The invention uses calcium carbide slag to prepare autoclaved aerated concrete blocks, so that the active components in the raw materials can fully react under autoclaved conditions, and overcome the problems of high magnesium content and insufficient heat insulation of lime-sand brick wall materials , and give full play to the characteristics of light weight, heat preservation, heat insulation, sound absorption, fire prevention, and easy processing of aerated concrete to provide an energy-saving wall material. Therefore, sludge and carbide slag are two major pollution sources affecting the urban environment. Using them to produce eco-environmental materials is in line with the development direction of circular economy