Abstract
An improved design method of pervious concrete was proposed to lower the deviation between the designed and actual porosity and maintain both mechanical property and permeability of pervious concrete. The improved design method is mainly based on the optimal volume ratio of paste to aggregate (VRPA), which was determined by testing the average thickness of cement paste coating aggregate. The performances of pervious concrete designed by the traditional method and the improved one were compared. The results show that with the increase of designed porosity, the reduction of compressive strength and flexural strength of pervious concrete designed by the improved method is significantly smaller than those designed by the traditional one. The maximum deviation between the designed and actual porosity of the pervious concrete by the improved method is only 1.54%, which is far less than 8.7% obtained by the traditional one. Micro-structural analysis shows that the porous distribution of pervious concrete designed by improved method exhibits better uniformity.
摘要
为了减小透水混凝土设计孔隙率与实际孔隙率的偏差, 保持其良好的力学性能和渗透性, 提出 了一种改进的透水混凝土设计方法。改进后的透水混凝土设计方法主要是基于最优浆骨比(VRPA)的参 数提出来的, 而最优浆骨比是通过测试包裹集料水泥浆体的平均厚度来确定的。通过对比两种传统方 法设计透水混凝土性能, 发现随着设计孔隙率的增加, 采用改进方法设计的透水混凝土的抗压强度和 抗折强度折减量明显小于传统设计方法设计的透水混凝土的折减量。采用改进方法制备的透水混凝土 孔隙率设计值与实际值的最大偏差仅为1.54%, 远小于采用传统方法的最大偏差8.7%。微观结构分析 表明, 采用改进方法设计的透水混凝土中孔隙分布具有较好的均匀性。
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Projects(51978346, 51778302) supported by the National Natural Science Foundation of China; Project(202002N3117) supported by the Ningbo Science and Technology Project, China
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BA Ming-fang provided the concept, conducted the literature reviews and edited the draft of manuscript. QI Xin-yu conducted the experiments and wrote the first draft of the manuscript. ZHEN Yu-hang and HUANG Guo-yang cooperated with QI Xin-yu for the experiments and analysis. HE Zhi-min advised some experimental methods. LIU Jun-zhe designed the experimental program.
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BA Ming-fang, QI Xin-yu, ZHEN Yu-hang, HUANG Guo-yang, HE Zhi-min and LIU Jun-zhe declare that they have no conflict of interest.
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Ba, Mf., Qi, Xy., Zheng, Yh. et al. Improved designed method of pervious concrete based on optimal volume ratio of paste to aggregate. J. Cent. South Univ. 28, 1534–1545 (2021). https://doi.org/10.1007/s11771-021-4713-y
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DOI: https://doi.org/10.1007/s11771-021-4713-y
Key words
- pervious concrete
- absolute volume method
- volume ratio of paste to aggregate
- mechanical properties
- porous structures
- permeability