Research on pavement performance of recycled permeable concrete based on orthogonal test
韦祝 1付希尧 1张建 2李锡松 2麦满生2
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作者信息
1. 广西建设职业技术学院,广西南宁 530007
2. 广西壮族自治区建筑工程质量检测中心有限公司,广西南宁 530031
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摘要
通过正交试验研究了粉煤灰、矿渣微粉、硅灰等矿物掺合料以及再生骨料替代率对再生透水混凝土抗压强度、有效孔隙率、透水系数、耐磨性的影响.结果表明:再生骨料替代率对再生透水混凝土 28 d抗压强度和透水系数影响最显著,随再生骨料替代率的增加,28d抗压强度逐渐降低,透水系数显著增大;粉煤灰掺量对磨坑长度的影响最显著,随粉煤灰掺量的增加,再生骨料透水混凝土的耐磨性显著提高.基于功效系数法,综合性能最优配比为:粉煤灰、矿渣微粉、硅灰掺量分别为15％、5％、8％,再生骨料替代率为30％,制得的再生透水混凝土 28 d抗压强度为25.9 MPa,透水系数为2.04mm/s,磨坑长度为31.7 mm.
Abstract
The influence of mineral admixtures such as fly ash,slag micro powder,silica fume,and the substitution rate of re-cycled aggregates on the compressive strength,effective porosity,permeability coefficient,and wear resistance of recycled permeable concrete was studied through orthogonal experiments.The results show that the replacement rate of recycled aggregate has the most significant impact on the 28 day compressive strength and permeability coefficient of recycled permeable concrete.With the in-crease of the replacement rate of recycled aggregate,the 28 day compressive strength gradually decreases and the permeability co-efficient gradually increases.The effect of fly ash content on the length of grinding pits is most significant.With the increase of fly ash content,the wear resistance of recycled aggregate permeable concrete is significantly improved.Based on the efficiency co-efficient method,the optimal ratio for comprehensive performance is 15％,5％,and 8％of fly ash,slag micro powder,and silica fume,respectively.The replacement rate of recycled aggregates is 30％.The 28 day compressive strength of the recycled permeable concrete produced is 25.9 MPa,the permeability coefficient is 2.04 mm/s,and the grinding pit length is 31.7 mm.
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