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A modified mix design method for pervious concrete based on Mohr-Coulomb failure criterion

机译：基于Mohr-Coulomb失败标准的渗透混凝土改进混合设计方法

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Large porosity and connected porous structure enables pervious concrete to obtain water permeability, but significantly decreases its strength. It is still a critical challenge for the mix design of pervious concrete to well balance its permeability and strength. The purpose of this paper is to study the strength mechanism of pervious concrete and propose a modified mix design method based on Mohr-Coulomb failure criterion. Five groups of samples with different aggregate-cement ratio varied from 5:1 to 4:1 were prepared (target porosity was 20%). The triaxial tests were applied to investigate the axial compression of these pervious concrete samples at different confining pressure. The results show that Mohr-Coulomb failure criterion can be used to describe the behavior of pervious concrete with compression. With the decrease of the thickness of cement paste, the cohesion first increase, and then decrease slightly. At the same porosity, the cementitious paste thickness was largely determined by aggregate content coefficient (ACC). A modified mix design method based on Mohr-Coulomb failure criterion was put forward by introducing the aggregate content coefficient (ACC). It was observed that ACC had little influence on porosity, pore area and fractal dimension of pervious concrete, and pervious concrete with different ACC had similar permeability. The strength increased with the decrease of ACC, but the growth rate was gradually decreasing. For the case in this paper, 0.94 was found to be the optimal value for ACC. By the modified mix design method, pervious concrete gained a similar permeability but obviously improved strength compared to the pervious concrete designed by conventional method. (C) 2020 Elsevier Ltd. All rights reserved.
机译：大孔隙率和连接多孔结构使得能够获得渗透性的混凝土，但显着降低其强度。对于渗透性混凝土的混合设计来平衡其渗透性和力量仍然是一个危急挑战。本文的目的是研究透水混凝土的强度机制，并提出了一种基于Mohr-Coulomb失效标准的改进的混合设计方法。制备了五组具有不同骨料水泥比的样品，制备5：1至4：1（靶孔隙率为20％）。应用三轴试验以研究这些透水混凝土样品在不同的限制压力下的轴向压缩。结果表明，Mohr-Coulomb失败标准可用于描述具有压缩的渗透混凝土的行为。随着水泥浆料厚度的降低，凝聚力首先增加，然后略微降低。在相同的孔隙率下，水泥糊厚度大大通过骨料含量系数（ACC）决定。通过引入聚合含量系数（ACC）来提出了一种基于MoHR-Coulomb失败标准的修改的混合设计方法。观察到ACC对孔隙率，孔隙区域和渗透混凝土的分形尺寸几乎没有影响，并且具有不同ACC的渗透混凝土具有相似的渗透性。随着ACC的降低，力量增加，但增长率逐渐降低。就本文而言，发现0.94是ACC的最佳价值。通过改进的混合设计方法，与通过常规方法设计的透水混凝土相比，渗透混凝土获得了类似的渗透性，但显着提高了强度。 （c）2020 elestvier有限公司保留所有权利。

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