Method for preparing ultra-high performance concrete by using construction waste recycled aggregate: Fid-Bau Portal

Method for preparing ultra-high performance concrete by using construction waste recycled aggregate

WANG KAI / CHEN YONG / YUAN YINGJIE

The invention discloses a method for preparing ultra-high performance concrete by using construction waste recycled aggregate, and belongs to the technical field of concrete preparation. The method comprises the following steps: step 1, pretreating construction waste, namely hammering and crushing waste concrete, and then selecting metal and reinforcing steel bars in the waste concrete by using a magnetic sorting device; 2, recycled aggregate is prepared, crushing is conducted through a jaw crusher, fine particles with the particle size being 5 mm or below are screened out, and particles with the particle size being 5 mm to 40 mm are obtained; through eccentric rotating equipment, the materials are collided and ground, mortar and cement paste are removed, and therefore recycled aggregate is obtained; 3, designing a reasonable concrete mix proportion according to the physical and mechanical properties of the recycled aggregate in combination with the engineering requirements and the use environment; the recycled aggregate has relatively high water absorption, so that the water-cement ratio in the concrete needs to be properly increased; the sorting efficiency of the metal in the concrete can be greatly improved.

本发明公开了混凝土制备技术领域的一种利用建筑垃圾再生骨料制备超高性能混凝土的方法：步骤一：对建筑垃圾进行预处理，包括将废弃的混凝土进行锤击破碎，然后通过磁性分选装置选出其中的金属和钢筋；步骤二：再进行再生骨料的制备，经过颚式破碎机进行破碎，筛除5mm以下的细颗粒，得到5‑40mm的颗粒；再通过偏心旋转设备，使其碰撞、研磨，除去砂浆和水泥浆，从而得到再生骨料；步骤三：然后，根据再生骨料的物理和力学性质，结合工程要求和使用环境，设计合理的混凝土配合比；由于再生骨料具有较大的吸水性，因此应适当增加混凝土中的水灰比；本发明可以大大提高混凝土中金属的分选效率。

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