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Application of construction waste composite powder material in small precast concrete

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Document pages: 11 pages

Abstract: Due to the prosperity of infrastructure construction, construction and demolition waste increased rapidly. In order to make effective use of construction waste, the potential use of construction waste composite powder material (cwcpm) as small precast concrete cementitious material is studied in this paper. Three types of such concrete, namely C20, C25 and C30, were selected to study the effects of cwcpm on its working properties, mechanical properties, impermeability and antifriction properties. In addition, the effects of cwcpm on the morphology, hydration products and pore structure characteristics of cement-based materials are also analyzed. The results are encouraging. Although cwcpm slightly reduces the mechanical properties of C20 concretend the 7 d compressive strengths of the C25 and C30 concretes, the 28 d compressive strength and the 90 d flexural strength of the C25 and C30 concretes are improved when CWCPM has a dosage less than 30 ; CWCPM improves the antipermeability and antifrost performances of the concretes due to its filling and pozzolanic effects; the best improvement is obtained at CWCPM dosage of 30 ; CWCPM optimizes cement hydration products, refines concrete pore structure, and gives rise to reasonable pore size distribution, therefore significantly improving the durability of the concretes.

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