Effective Use of Demolition Waste Concrete Stored in Temporary Stock Yard for Construction Waste Materials

为了开发建筑垃圾回收利用系统，本研究以建筑垃圾临时堆场中存放的拆除废混凝土为研究对象，建立了建筑垃圾回收利用系统。研究了由这些废旧材料制成的再生骨料(细骨料和粗骨料)的性能及其变化。同时，对再生骨料混凝土和混凝土结构(钢筋混凝土梁)的性能进行了研究。主要研究成果如下：(1)在相同水灰比条件下，再生混凝土的抗压强度比普通混凝土降低10%。对于杨氏模量，再生混凝土的降幅大于强度情况，并且受再生骨料的原始砂浆掺量的影响较大。(2)再生混凝土的塑性变形能力比普通混凝土差，导致钢筋混凝土梁的开裂弯矩和极限抗剪强度劣化。

In this study, to develope the recycle system for construction waste materials, recycled use system of demolition waste concrete stored in temporary stock yars for construction waste materials were considered. The properties and their variations of recycled aggregates (both fine and coarse) made from these waste materials were investigated. At the same time, the properties of concrete and concrete structures(reinforced concrete beams) containing these recycled aggregates were studied. Main results obtained are as follows.(1) Compressive strength of recycled concrete is lower 10% than that of normal concrete for the same water cement ratio. As for Youn's modulus, the reduction for recycled concrete is larger than the case of strength, and are affected strongly by the amount of origin mortar containing recycled aggregate.(2) Capacity of plastic deformation of recyled concrete is inferior to that of normal concrete, resulting deterioration of crack moment and ultimate shear strength of the reinforced concrete beams.