Effects of Various Admixtures on the Performance of Renovation and Demolition Waste Flow Backfill Materials and Their Engineering Applications
Renovation waste and demolition waste consists with complex compositions,challenging the retreatment process and utilization as construction waste.Recycled aggregates from these sources present significant fluctuations in quality and performance,thus failing to complied with the required standards.Apart from being used in the production of cement bricks,there is insufficient effective methods for utilization.On the other hand,flow backfill materials have low strength requirements and advantages such as self-leveling,easy mixing,and backfilling capabilities,making them applicable for wide-ranging disposal of various industrial solid waste and construction debris.This paper focuses on the limitations of existing construction waste flow backfill materials,especially those using cement as a solidifying agent.The impact of different types of admixtures on the performance of flow backfill materials was studied.Research results show that,for renovation and demolition waste flow backfill materials,the addition of sludge incineration ash significantly reduces the fluidity.Incorporating steel slag powder increases the water permeability,while mineral powder slightly reduces the compressive strength.The inclusion of fly ash can effectively can improve material water permeability and regulates its flowability.Based on these findings,flow backfill materials for foundation pit backfilling projects involving renovation and demolition waste were determined and applied in the Yunnan Baiyao Shanghai International Center project.
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