摘要
选用3种有机硅憎水剂材料,分别将不同掺量(0、0.1%、0.3%、0.6%、1.0%,有效成分占水泥质量比)的憎水剂内掺到透水混凝土中,通过抗压强度、有效孔隙率、透水系数和吸水率试验,研究不同类型不同掺量有机硅憎水剂对透水混凝土性能的影响。结果表明:3种有机硅憎水剂均不同程度地降低了试件28 d龄期的抗压强度,且都存在最佳掺量;乳液型憎水剂较粉末型憎水剂对28 d龄期下试件的抗压强度影响更小,硅烷乳液在最佳掺量0.6%时,其抗压强度仅下降2.0%;内掺有机硅憎水剂均加大了试件有效孔隙率,最佳掺量下其透水系数显著增大,最大增长率为133.3%;憎水剂在透水混凝土孔隙中形成膜结构,对试件吸水率有较大影响,吸水率较对照组最大可降低50%。研究成果可以为有机硅憎水剂材料在透水混凝土领域的实际工程运用提供一定的技术参考。
Three kinds of organic silicon materials with different contents(0,0.1%,0.3%,0.6%,1.o%,ratio of active ingredients accounting for the cement quality)are mixed into pervious concrete,and the effects of different types and different contents hydrophobic agent on the properties of pervious concrete are studied by the test of compressive strength,effective porosity,permeability coefficient and water absorption rate.The results show that:all the three types organic silicon hydrophobic agent have reduced the compressive strength of test specimen at 28 d to different degrees,and all has the best mixing amount;emulsion-type hydrophobic agent has less effect on compressive strength of specimen at age 28 d than powder-type hydrophobic agent,and the compressive strength of silane emulsions decreases by only 2.0%at the optimal dosage level of 0.6%.All the hydrophobic agent can increase the effective porosity of the test piece,and the permeability coefficient with the optimum dosage increases significantly,with a maximum growth rate of 133.3%.The hydrophobic agent forms a membrane structure in the inner wall of the pervious concrete pore,which has a great influence on the water absorption rate of the pervious concrete,and the water absorption rate can be reduced by up to 5o%compared to the control group.The research results can provide technical reference for the practical application of silicone hydrophobic materials in the field of the pervious concrete.
作者
孙广平
朱洪威
程军旺
丁伟正
SUN Guang-ping;ZHU Hong-wei;CHENG Jun-wang;DING Wei-zheng(Jiangxi Key Laboratory of Environmental Geotechnical and Engineering Disaster Control,Jiangxi University of Science and Technology,Ganzhou 341000,China;School of Civil and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《公路》
北大核心
2023年第4期330-336,共7页
Highway
关键词
透水混凝土
有机硅憎水剂
抗压强度
透水系数
吸水率
pervious concrete
organic silicon hydrophobic agent
compressive strength
permeability coefficient
water absorption rate
