Composite household garbage incinerator bottom slag coal ash for concrete

Abstract

The invention relates to a composite household garbage incinerator bottom slag coal ash for concrete, and the coal ash is prepared by grinding the bottom slag of a household garbage incinerator, wet discharged coal ash, basalt and composite activity excitant by virtue of grinding equipment and then mixing the materials uniformly. The fineness of the composite coal ash is controlled to be less than 15% of residues via a square hole sieve 45mm in diameter, and the water content of the coal ash is less than 0.5%. The coal ash is simple in production process, and takes easily obtained wet discharged coal ash, the bottom slag of the household garbage incinerator, waste corner material of a basalt plant and other industrial wastes as main raw materials. By virtue of optimal combination, the optimal superimposed effect and grain composition of all components are expressed fully, thus part of cement in the concrete can be replaced by the composite coal ash. The coal ash can be used for saving resources and energy source, and is beneficial to industrial production, environmental protection, energy conservation and emission reduction, can be used for developing a new way for the resource utilization of the bottom slag of the municipal household garbage incinerator, and has good social effects and economic benefits.

Description

technical field [0001] The invention belongs to the field of construction, and relates to a construction material, in particular to a composite domestic waste incinerator bottom slag fly ash for concrete. Background technique [0002] As today's bulk man-made building materials, cement concrete plays an important role in economic construction, but the cementitious material used in concrete—cement, has serious problems in the production process of resource consumption, energy consumption and environmental pollution. A large amount of non-renewable resources such as limestone, clay, and coal emit tons of CO 2 , SO 2 Exhaust gas and dust will cause serious pollution to the environment. In the context of the increasing importance of energy and natural resource conservation around the world, most countries have shown active interest in the economic, environmental and technological advantages of industrial waste in the construction process, and many industrial wastes have been s...

AI Technical Summary

Problems solved by technology

At present, the use of wet-discharged fly ash as a concrete admixture has the following disadvantages: 1. Use wet-discharged coal ash to make slurry, but the moisture is difficult to control, and because the wet-discharged ash site is not next to the concrete mixing station, the slurry It is difficult to transport, and the quality is unstable, and it is difficult to guarantee the quality of concrete. Second, the wet-discharged fly ash is dried first and then ground. The production process is dusty, the air pollution is serious, the energy consumption is too high, and the cost is high

Patent 200910052024.0 discloses a composite admixture for concrete and its preparation method. It is mentioned that the composite admixture is made of municipal solid waste incineration bottom ash, fly ash and slag, and the used municipal solid waste incineration bottom ash has not been screened , contains more impurities (metals, unburned substances), and has a large content of soluble salts, which can easily affect the performance of concrete

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