基于透水再生混凝土的抗压性能试验对比研究

The comparative study on compressive property experiment of permeable recycled concrete

为了探究透水再生混凝土抗压性能,选取掺加35%由废弃C30混凝土破碎得到的再生骨料混凝土和未添加再生骨料的混凝土各6组,分别就再生骨料混凝土抗压性能以及水灰比和骨料粒径对混凝土抗压性能的影响进行了试验研究。研究成果表明:首先,35%产量的再生骨料透水混凝土试块抗压强度标准值较纯天然骨料混凝土试块标准值低13.3%;其次,本次试验得到的最佳水灰比为0.30,增加或减小水灰比均会对再生骨料透水混凝土的抗压性能造成不良影响;第三,增大粗骨料粒径,会使得再生混凝土抗压性能变差,但减小粗骨料粒径会使得透水混凝土渗水能力减低,为此,应按照实际工程对混凝土强度和孔隙率(透水能力)的需求,合理选取骨料粒径。本文研究成果为废弃混凝土再生提供了更充分的数据支持和理论支撑。

In order to study the compressive property of pervious recycled concrete,six groups of recycled aggregate concrete with 35%recycled aggregate concrete and six groups of concrete without recycled aggregate are selected for the test in this paper.The compressive property of recycled aggregate concrete,the effect of water cement ratio and aggregate size on the compressive properties of concrete is studied.The research result is shown as follows.Firstly,the standard value of compressive strength of recycled aggregate pervious concrete blocks with 35%yield is 13.3%lower than that of pure natural aggregate concrete blocks.Secondly,the optimal water-cement ratio obtained in this experiment is 0.30.The increasing and decreasing of the water-cement ratio will have a negative impact on the compressive performance of recycled aggregate permeable concrete.Thirdly,the increasing of the diameter of coarse aggregate will make the compressive performance of recycled concrete worse,but the reducing of the diameter of coarse aggregate will reduce the permeability of permeable concrete.Therefore,the size of aggregate should be selected reasonably according to the actual engineering requirement for concrete strength and porosity(permeability).The research result in this paper provides the more sufficient data support and theoretical basis for the recycling of waste concrete.