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<p>Traditionally, construction waste is mainly stacked in the open or simply landfilled, causing some environmental pollutions. At present, research on resource utilization of construction waste is relatively fewer compared with that on its sources, prediction and management. Additionally, most of its resource research is centered on several aspects, such as using as precursors of alkali-activated materials, reusing in cementitious mortars, concrete and bricks. Thus, it is of great significance to widen the ways of resource utilization of construction waste. In this study, construction waste and fly ash were utilized as raw materials to prepare ceramsite. The effects of raw material mass ratio, calcination temperature and calcination time on the properties and adsorption performance of the ceramsite were discussed. The optimal process parameters were determined to be the mass ratio of construction waste/fly ash 5:5, the calcination temperature 1120℃, and the calcination time 20&#xa0;min. The ceramsite obtained under those conditions possessed good properties including particle strength of 9.75&#xa0;MPa, void fraction of 61.09% and 1-h water absorption rate of 14.95% that met the standard requires of "Lightweight aggregate and its test methods" (GB/T 17431–2010) and “Artificial ceramsite filter for water treatment” (CJ/T 299–2008). The ceramsite exhibited an excellent performance that was comparable to or even superior to the other ceramsites studied previously and certain commercial ones, such as its high compressive strength (1.4 ~ 7.5 times that of the aforementioned), demonstrating the feasibility of its practical application.</p>

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Preparation and Characterization of Lightweight Ceramsite from Construction Waste and Coal Fly Ash

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Xue Song,
  • Weishuang Lou,
  • Zhengqiu Li,
  • Bopeng Zhao,
  • Lin Wang,
  • Xiu Li,
  • Yuejiao Zhang,
  • Wenjing Sun,
  • Yingming Zhang,
  • Yongde Liu,
  • Hongyun Yang

摘要

Traditionally, construction waste is mainly stacked in the open or simply landfilled, causing some environmental pollutions. At present, research on resource utilization of construction waste is relatively fewer compared with that on its sources, prediction and management. Additionally, most of its resource research is centered on several aspects, such as using as precursors of alkali-activated materials, reusing in cementitious mortars, concrete and bricks. Thus, it is of great significance to widen the ways of resource utilization of construction waste. In this study, construction waste and fly ash were utilized as raw materials to prepare ceramsite. The effects of raw material mass ratio, calcination temperature and calcination time on the properties and adsorption performance of the ceramsite were discussed. The optimal process parameters were determined to be the mass ratio of construction waste/fly ash 5:5, the calcination temperature 1120℃, and the calcination time 20 min. The ceramsite obtained under those conditions possessed good properties including particle strength of 9.75 MPa, void fraction of 61.09% and 1-h water absorption rate of 14.95% that met the standard requires of "Lightweight aggregate and its test methods" (GB/T 17431–2010) and “Artificial ceramsite filter for water treatment” (CJ/T 299–2008). The ceramsite exhibited an excellent performance that was comparable to or even superior to the other ceramsites studied previously and certain commercial ones, such as its high compressive strength (1.4 ~ 7.5 times that of the aforementioned), demonstrating the feasibility of its practical application.