Development of Practical Use of Recycled Aggregate for Concrete

在这项研究中，以推广的实际使用的拆除废弃物混凝土制成的再生骨料（细和粗）的性能进行了调查，从拆除废弃物混凝土储存在临时堆场的建筑废料和混凝土含有这些再生骨料。主要研究结果如下：1.与普通骨料混凝土相比，再生骨料混凝土的抗压强度和耐久性较差。而这些范围内的掺量受再生细集料质量的影响.加速试验表明再生混凝土的碳化速度比普通混凝土快.加速试验表明再生混凝土中钢筋的锈蚀率大于普通骨料混凝土中钢筋的锈蚀率。在使用优质再生细骨料的情况下，通过调整混凝土的水灰比可以恢复再生混凝土的这些劣化性能。

In this study, to spread the practical use of recycled aggregate made from demolition waste concrete, the properties of recycled aggregates (both fine and coarse) made from the demolition waste concrete stored in temporary stock yards for construction waste materials and concretes containing these recycled aggregates were investigated. Main results obtained are as follows.1. Compressive strength and durability of concrete containing recycled aggregate are worse compared normal aggregate concrete. And the amount of these range are affected by the quality of recycled fine aggregate.2. Speed of carbonation of recycled concrete by accelerated test are higher than that of normal concrete. And the rates of rust of steel bar in the recycled concrete are larger than the case in the normal aggregate concrete by accelerated test.3. These deterioration properties of recycled concrete can be recovered by adjusting the water cement ratio of concrete in the case that high quality recycled fine aggregate is used.