低砂取代率透水混凝土的力学性能和冻融耐久性能研究  

Mechanical Properties and Freeze-thaw Durability of Low-sand Replacement Rate Pervious Concrete

作　　者：周书林 王华 王祺顺 王文盛[4] 张伟 ZHOU Shulin;WANG Hua;WANG Qishun;WANG Wensheng;ZHANG Wei(Highway Development Center of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530028, China;Guangxi Transportation Science and Technology Group Co. ,Ltd. , Nanning, Guangxi 530007, China;Hunan Communications Research Institute Co. ,Ltd. , Changsha, Hunan 410015, China;Jilin University, Changchun, Jilin 130022, China;Power China Guiyang Engineering Corporation Limited, Guiyang,Guizhou 550000, China)

机构地区：[1]广西壮族自治区公路发展中心,广西南宁530028 [2]广西交科集团有限公司,广西南宁530007 [3]湖南省交通科学研究院有限公司,湖南长沙410015 [4]吉林大学,吉林长春130022 [5]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550000

出　　处：《公路工程》2022年第1期135-141,共7页Highway Engineering

基　　金：湖南省交通科技项目(201826);黔科合支撑[(2018)2814]。

摘　　要：为了解决季冻区透水混凝土力学性能和冻融耐久性不足的问题,采用等质量法取代天然粗骨料制备了低砂取代率透水混凝土(Low-Sand Replacement Rate Pervious Concrete,SPC),研究了不同砂取代率(0%、2%、4%、6%、8%和10%)对透水混凝土的有效孔隙率、渗透系数、抗压强度、抗折强度和冻融耐久性能的影响。试验结果表明,随着砂取代率的增加,抗压强度和抗折强度呈先增加后降低的趋势,当砂取代率为8%时,抗压强度和抗折强度达到最高值。有效孔隙率和渗透系数的趋势与强度相反。随着冻融循环试验的进行,SPC的抗压强度逐渐降低,当冻融循环次数相同时,SPC的抗压强度损失率随着砂取代率的增加先增加而后降低。经过100次冻融循环后,砂取代率8%的透水混凝土抗压强度损失率最低,比对照组(0%)降低了10.96%。说明加砂能有效地提高透水混凝土的冻融耐久性。此外,根据试验结果,推荐的砂取代率为8%。To solve the problems of mechanical properties and freeze-thaw durability of pervious concrete in seasonal freezing zone.The equal quality method was used to replace natural coarse aggregate to prepare low-sand replacement rate pervious concrete(SPC).The effects of different sand replacement rate(0%,2%,4%,6%,8%and 10%)on the effective porosity,permeability coefficient,compressive strength,flexural strength and freeze-thaw durability of SPC were investigated.The experimental results showed that as the sand replacement rate increases,the compressive strength and flexural strength first increased and then decreased.When the sand replacement rate was 8%,the compressive strength and flexural strength reached the highest value.The trend of effective porosity and permeability coefficient was opposite to strength.With the freeze-thaw cycle test progresses,the compressive strength of SPC gradually decreased.When the number of freeze-thaw cycles was the same,the compressive strength loss rate of SPC first increased and then decreased with the increase in the sand replacement rate.After 100 freeze-thaw cycles,the compressive strength loss rate of SPC with a sand replacement rate of 8%was the lowest,which was 10.96%lower than that of the control group(0%).It showed that adding sand could effectively improve the freeze-thaw durability of SPC.In addition,according to the experimental results,the recommended sand replacement rate was 8%.

关 键 词：砂 透水混凝土 力学性能 渗透性 冻融耐久性 

分 类 号：TU528[建筑科学—建筑技术科学]