成型参数对透水混凝土抗压强度的影响研究

Study on the Influence of Forming Parameters on Compressive Strength of Pervious Concrete

为探究成型参数、试件净重与透水混凝土抗压强度之间的关系,选用5~10,10~15mm 2种粗骨料粒径制备若干组试件。成型方式为人工插捣,以每层插捣次数、单个试件净重作为变量设计对比试验,研究抗压强度变化规律。研究结果表明,2种粒径的透水混凝土在不同插捣次数下,试件净重与平均抗压强度变化关系一致;3次入模且每层插捣30次时,试件净重应控制为7. 5kg;当插捣增至40次时,试件净重应相应增至7. 7kg,此时混凝土强度等级可达C20,且透水系数满足要求;本试验推荐每个试件净重7. 5kg,分3层入模,每层插捣30次;透水混凝土试件净重对抗压强度有一定影响,存在最佳净重值。

To explore the relationship between the parameters of molding,the net weight of specimens and the compressive strength of previous concrete,the several groups of specimens are prepared by using 5 ~10 mm and 10 ~ 15 mm aggregates.The forming mode is mtamping.The comparative test of design is carried out with the number of tamping per layer and the net weight of a single specimen as variables,which will study on the variation of compressive strength. The results show that the relationship between the net weight and the average compressive strength of the previous concrete with different particle sizes is the same.The net weight of the test piece should be controlled at 7. 5 kg,3 layers and 30 times for each layer.When the tamping times is increased to 40 times,the net weight should be increased to 7. 7 kg. At this time,the grade of compressive strength can reach C20,and the permeability coefficient is qualified. The recommended scheme is the net weight of specimen is 7. 5 kg,3 layers into the mould,and each layer is tamping 30 times.The net weight of the previous concrete has an influence on the compressive strength,and there is an optimal value between them.