Multi-element solid waste concrete block and preparation method thereof

Abstract

The invention discloses a multi-element solid waste concrete block and a preparation method thereof, and belongs to the field of building materials. The multi-element solid waste concrete block is prepared from phosphogypsum-based cement, recycled coarse aggregate, recycled fine aggregate, water, plant fibers and a water reducing agent in percentage by weight. The phosphogypsum-based cement is composed of phosphogypsum, slag, steel slag, limestone and a small amount of Portland cement clinker. The prepared gypsum concrete is vibrated and uniformly stirred, then put into a pressure forming machine, and prepared into a small hollow concrete block by means of extruding, vibrating, forming, demolding and curing. The compressive strength and the comprehensive performance of the prepared building block are guaranteed, the national waste resource comprehensive utilization industrial policy is met, the problem that construction waste and industrial waste residues are difficult to dispose is solved, and the building block has important practical significance and remarkable application value.

Description

technical field [0001] The invention belongs to the technical field of building materials, and particularly relates to a multi-component solid waste concrete block and a preparation method thereof. Background technique [0002] In 2019, my country's cement output was 2.33 billion tons. Large-scale infrastructure construction will continue for many years, and the demand for cement is still very large. However, the traditional cement not only consumes a large amount of limestone, clay, coal, etc., but also emits hundreds of millions of tons of CO2, SO2, NOX and other waste gas and dust into the environment, causing serious pollution to the environment. Therefore, in the future, the cement industry must strictly limit the amount of Portland cement clinker, and use less or no Portland cement clinker to produce hydraulic cementitious materials to replace ordinary cement. [0003] Phosphogypsum is an industrial by-product in the process of producing phosphoric acid by wet process...

AI Technical Summary

Problems solved by technology

At present, the treatment methods of construction waste in my country are relatively simple, and they are mostly used for roadbed backfill or non-load-bearing components. Most of them are landfilled or piled in the suburbs, and the resource utilization rate is less than 10%.

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