再生粗骨料和高炉矿渣砂配合比对混凝土性能的影响分析

Study on the Effect of Mixture Ratio of Recycled Coarse Aggregate and Blast Furnace Slag Sand on the Performance of Concrete

再生骨料混凝土造价相对低廉,环保性能优异,在各类建筑工程中具有广泛应用价值,但工程实践中由于其耐久性较低、强度水平较差,导致难以得到广泛应用。为解决这一问题,设计几种不同高炉矿渣砂和再生骨料配合比添加到混凝土中,设计实验探究各组混凝土性能差异,分析添加高炉矿渣砂、再生粗骨料的改性混凝土抗冻融性能、抗压强度性能和泌水性能差异。实验结果显示,使用高炉矿渣砂和再生粗骨料制备的混凝土相较普通混凝土而言,养护龄期为28 d时抗压强度已经十分接近,另外采用高炉矿渣砂替代50%天然骨料碎砂石和再生粗骨料制备所得混凝土抗冻融性能和泌水性能得到显著改善。

Recycled aggregate concrete is widely used in all kinds of building engineering,based on its relatively inexpensive and excellent environmental performance.However,it has not been widely applied in engineering practice,due to its low durability and strength level.In order to solve the problem,this study compared the effects of different proportions of blast furnace slag sand and recycled coarse aggregates added to concrete on the differences in concrete performance.This study compares the differences in freeze-thaw resistance,compressive strength,and bleeding performance of modified concrete with added blast furnace slag sand and recycled coarse aggregate.The results show that the compressive strength of concrete made of blast furnace slag sand and recycled coarse aggregate is very close to that of ordinary concrete when the curing period is 28 days.In addition,the freeze-thaw resistance and bleeding performance of concrete prepared by using blast furnace slag sand instead of 50%crushed sand and mixing with recycled coarse aggregate are significantly improved.