Development of Practical Use of Recycled Aggregate for Concrete

为推广拆迁废旧混凝土再生骨料的实际应用，对存放在建筑垃圾临时堆场的拆迁废旧混凝土再生骨料(细粒和粗骨料)和含有这些再生骨料的混凝土的性能进行了研究。取得的主要结果如下：1.研究成果。与普通骨料混凝土相比，掺再生骨料混凝土的抗压强度和耐久性能较差。这些范围的大小受再生细集料质量的影响。通过加速试验，再生混凝土的碳化速度高于普通混凝土。通过加速试验，再生混凝土中钢筋锈蚀率大于普通骨料混凝土。在使用优质再生细骨料的情况下，可以通过调整混凝土的水灰比来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.