建筑废弃混凝土再生利用新技术的试验研究

Experimental study on new technology of the construction waste concrete recycling

将废弃混凝土破碎加工成再生集料部分或全部代替天然集料,配制形成再生混凝土实现建筑废弃物资源化利用,存在成本增加和二次污染的问题。本研究基于堆石混凝土技术,提出一种废弃混凝土再生利用新技术。将建筑废弃混凝土简单破碎成大粒径骨料堆积形成堆体,然后浇筑性能优良的自密实混凝土形成堆体混凝土,进行了自密实混凝土的填充性能、堆体混凝土抗压和抗折试验研究。试验结果表明:自密实混凝土能够较好地填充废弃混凝土空隙形成均匀的堆体混凝土,堆体混凝土的抗压强度和弯曲抗拉强度与浇筑的自密实混凝土强度相当。本研究提出的废弃混凝土利用新技术可以高效经济的实现对废弃混凝土的再生资源化与重新开发利用。

Some or all of the natural aggregate could be replaced by the recycled aggregate crushed with the waste concrete.The recycled concrete will be constructed with the recycled aggregate to realize the construction waste resource utilization.But it will bring about the problem of increased costs and secondary pollution.Based on the rock-filled concrete technology, a new technology of recycling of waste concrete was proposed.At first,the waste concrete was simply broken into large diameter aggregate to be prepacked the rock-filled body; and then the self-compacting concrete was poured into the rock-filled body to construct the new recycled rock-filled concrete.The experiment of the filling property of self compacting concrete and the compressive and tensile properties were carried out.Laboratory test results showed that using this technology a dense and high strength concrete structure could be easily constructed due to the self-compacting con- crete could be used to fill the pores between the waste concrete.The recycled rock-filled concrete specimen may have a similar strength with self-compacting concrete when the pouring.The new technology of the renewable concrete proposed could realize the renewable resources and utilization of the waste concrete efficiently and economically.