再生粗骨料混凝土性能的研究

Researching of using waste concrete as coarse aggregate

将几种取自不同地点的废弃混凝土破碎制成粗骨料,然后通过不同搭配,配制成几种不同水灰比、坍落度的再生混凝土,并对其新拌混凝土早期的性能进行测试比较,研究结果表明,在相同条件下,再生混凝土的流动性比普通混凝土的差;再生混凝土的凝结时间比普通混凝土要短;再生混凝土的抗压强度一般随再生骨料掺量的增加而降低;吸水率高的再生骨料对应的再生混凝土强度低;通过各种方法的复合运用,可配得较高抗压强度的再生混凝土;混合再生骨料配制的再生混凝土,其中原始混凝土强度低的再生骨料,对低水灰比和高水灰比的再生混凝土有不同的影响效果。

Use the waste concrete taken from several different locations and different service lives as the coarse aggregate,and make those coarse aggregate into the recycled concrete that have several different water-cement ratio and slump by different match,then test and compare the early properties of the fresh concrete.The results show that under the same conditions,the mobility of the recycled concrete poorer than the ordinary concrete.The setting time of the recycled concrete shorter than the ordinary concrete.And generally,the compressive strength of recycled concrete decreased with the recycled aggregate dosage increased.The higher water absorption of recycled aggregate,the lower compressive strength of recycled concrete.By the use of various complexed methods,we can get more higher compressive strength of the recycled concrete.The recycled coarse aggregate that mixed to the recycled aggregate concrete,in which the strength of the original concrete is low,has different effect to the recycled concrete with lower water-cement ratio and higher water-cement ratio.