再生混凝土的基本性能研究

设计并完成了在掺与不掺减水剂两种配合比下,再生粗骨料取代率分别为0、30%、50%、100%的再生混凝土的和易性、立方体抗压强度、棱柱体抗压强度的相关试验,并以天然骨料混凝土作为基准进行了对比分析。试验结果表明,粗骨料取代率对混凝土的流动性、粘聚性与保水性有不同的影响,适量的减水剂可以增强混凝土的流动性;在水灰比相同的情况下,再生粗骨料取代率为30%时再生混凝土立方体抗压强度和轴心抗压强度都高于普通混凝土;再生混凝土的抗压强度随龄期的发展和普通混凝土比较相近。

Study on Basic Properties of Recycled Aggregate Concrete

The workability,cube compressive strength and axial compressive strength of recycled aggregate concrete are tested,which is based on the testes of natural concrete.The percentages of recycled aggregate are 0,30%,50% and 100%,with or without superplasticizer.The results show that recycled coarse aggregate replacement rate has different influences on the fluidity,cohesive properties and water retention property of concrete.Proper amount of superplasticizer can enhance the fluidity of concrete.In the case of the same water-cement ratio,the cube compressive strength and axial compressive strength of recycled aggregate concrete are higher than the natural concrete when the recycled coarse aggregate replacement rate is 30%.The development of compressive strength of recycled aggregate concrete with the ages is similar to the ones of natural concrete.