史俊禮1,蔡基偉1,高國防2,付萬長1,周奕菡1,王 顯1
史俊禮,蔡基偉,高國防,等.飽和泥漿法透水混凝土抗堵性試驗研究[J].混凝土與水泥制品,2021(2):13-17,22.
SHI J L,CAI J W,GAO G F,et al.Experimental Study on Resistance to Clogging of Pervious Concrete by Saturated Slurry Method[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):13-17,22.
飽和泥漿法透水混凝土抗堵性試驗研究
史俊禮1,蔡基偉1,高國防2,付萬長1,周奕菡1,王 顯1
史俊禮,蔡基偉,高國防,等.飽和泥漿法透水混凝土抗堵性試驗研究[J].混凝土與水泥制品,2021(2):13-17,22.
SHI J L,CAI J W,GAO G F,et al.Experimental Study on Resistance to Clogging of Pervious Concrete by Saturated Slurry Method[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):13-17,22.
摘 要:以表觀填隙系數為主要控制指標制備了不同強度等級的透水混凝土,分析了透水指標與連通孔隙率的關系。采用黃泛區粉土飽和泥漿作為堵塞介質,測定了預定次數堵塞(淋泥-晾干)循環后的各項透水指標,評價了飽和泥漿對透水混凝土抗堵塞性能的影響。結果表明:透水混凝土各項透水指標與連通孔隙率密切相關;當體系水灰(膠)比為0.24、表觀填隙系數為0.70、高性能減水劑摻量適當時,透水混凝土抗壓強度達到最高(28.3 MPa)且不積漿;經過堵塞循環后,透水混凝土的透水性下降明顯,與摻減水劑試樣相比,未摻減水劑試樣的透水性損失速度快;初始連通孔隙率為10.5%的透水混凝土,經受近30次飽和泥漿的堵塞循環后,透水系數基本衰減到相關規程規定的下限值以下。
Abstract: The samples were prepared by controlling apparent paste-void ratio in pervious concrete, and the relation of permeable parameters to continuous porosity was analyzed. The saturated slurry made of silt in Yellow River Flood Area played a role of clogging medium. The permeable parameters were measured after the samples suffered scheduled clogging (slurry sprinkling - air drying) cycles to evaluate the effect of saturated slurry on resistance of pervious concrete to clogging. The results reveal that the permeable parameters of pervious concrete are closely related to its continuous porosity. The pervious concrete with the highest strength (28.3 MPa) and without paste flow can be prepared with water-cement (binder) ratio of 0.24, proper dosage of superplasticizer and in apparent paste-void ratio of approximate 0.70. The permeability of pervious concrete obviously reduces after clogging cycles. The permeability of pervious concrete samples without superplasticizer generally loses faster than that of samples with superplasticizer. For the pervious concrete with initial continuous porosity of 10.5%, its coefficient of permeability decreases to less than minimum value defined by related specification after nearly 30 clogging cycles.
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