Research on the Technology of Collaborative Preparation of Lightweight Aggregate with Fly Ash
The preparation technology of artificial lightweight aggregates was studied with traditional domestic and industrial solid waste such as fly ash,coal gangue,and municipal sludge as raw materials. The compressive strength,water absorption rate,and specific surface area of lightweight aggregates prepared under sintering temperatures of 1100℃,1140℃,1180℃,1200℃,1220℃,and 1250℃ were measured and analyzed. The research results indicate that fly ash,coal gangue,and mu-nicipal sludge can synergistically prepare lightweight aggregates. All the five components of sintered ceramic lightweight ag-gregates meet the national standard requirements in the sintering range of 1100℃-1220℃,and the compressive strength decreases sharply when the sintering temperature exceeds 1250℃,which does not meet the national standard requirements. Under sintering temperature conditions of 1200℃,the water absorption performance indicators of various components of ce-ramsite lightweight aggregates with fly ash content ranging from 15wt％ to 35wt％ are better than the national standards,but the specific surface area gradually decreases,while the water absorption and specific surface area of ceramsite lightweight aggregates with fly ash content ranging from 50wt％ both decrease.
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