多因素耦合作用下透水混凝土道面抗冻性研究  

Study on Frost Resistance of Pervious Concrete Pavement under Coupling of Multiple Factors

作　　者：李长辉 石广顺 赵方冉[1] 陈宇 王洪龙[3] LI Chang-hui;SHI Guang-shun;ZHAO Fang-ran;CHEN Yu;WANG Hong-long(School of Airport,Civil Aviation University of China,Tianjin 300300,China;Shandong Provincial Architecture Design&Research Institute Co.,Ltd.,Jinan Shandong 250001,China;Tianjin Municipal Engineering Design&Research Institute,Tianjin 300000,China)

机构地区：[1]中国民航大学机场学院,天津300300 [2]山东省建筑设计研究院有限公司,山东济南250001 [3]天津市市政工程设计研究院,天津300000

出　　处：《公路交通科技》2021年第4期9-15,共7页Journal of Highway and Transportation Research and Development

基　　金：中央高校基本科研业务费项目(3122019106);天津市教委科研计划项目(2019KJ122)。

摘　　要：为达到机场水泥混凝土道面对环境及使用的特殊需求,采用透水混凝土材料作为部分机场的混凝土道面具有更强的综合优势。为研究透水混凝土道面在冻融环境及除冰液侵蚀耦合作用下的冻融破坏规律,采用控制变量法系统地开展了透水混凝土的试验研究,分别测定了在不同的孔隙率、冻融速率、除冰液浓度及温度等多种因素共同作用下透水混凝土材料的抗冻性能参数指标。结果表明:当最低温度与冻融速率相同时,多孔混凝土的抗冻性与乙二醇除冰液的浓度呈正相关趋势;当其他条件相同时,透水混凝土材料的抗冻性随温度的降低而变差,随冻结速率的增长而变差;当透水混凝土材料处于相同环境下时,其抗冻性随非连通孔隙的增大而变差。在经过100次冻融循环后,乙二醇浓度为25%的透水混凝土试件相比于乙二醇浓度为3.5%的透水混凝土试件的质量损失率减小了275.0%,相对动弹性模量提高了10.6%。对不同孔隙类型的冻胀模型进行模拟分析结果表明:上表层处的闭口孔隙中,圆形孔冻胀应力最大值位于正上方表层处,多边形孔隙冻胀应力最大值位于几何边角处。相邻闭口孔隙间会产生应力损伤带,损伤带贯穿后的区域更容易发生开裂或剥落。In order to meet the special requirements of environment and usage of airport cement concrete pavement,the use of pervious concrete material has a stronger comprehensive advantage as the concrete pavement of some airports.In order to study the freeze-thaw damage rule of pervious concrete pavement under the coupling of freeze-thaw environment and deicing fluid erosion,the experimental study of pervious concrete is conducted systematically by adopting the control variable method.The frost resistance parameters of pervious concrete under the combined action of different porosities,freeze-thaw rates,deicing fluid concentrations and temperatures are measured.The result shows that(1)when the minimum temperature and freeze-thaw rate are the same,the frost resistance of porous concrete is positively correlated with the concentration of glycol deicing fluid;(2)when the other conditions are the same,the frost resistance of pervious concrete becomes worse with the decrease of temperature and the increase of freezing rate;(3)when the pervious concrete material in the same environment,its frost resistance becomes worse with the increase of non-connected pores;(4)after 100 freeze-thaw cycles,the mass loss rate of the pervious concrete specimen with 25%glycol concentration is reduced by 275.0%compared with that of the pervious concrete specimen with 3.5%glycol concentration,while the relative dynamic elastic modulus is 10.6%higher.The result of simulation analysis of the frost heave models of different pore types shows that(1)in the closed pores at the upper surface,the maximum frost heave stress of circular pores is located at the upper surface layer,and the maximum frost heave stress of polygonal pores is located at the geometric corner;(2)There will be the stress damage zone between adjacent closed pores,and the area after the damage zone penetrates is more prone to cracking or spalling.

关 键 词：道路工程 抗冻性能 试验研究 透水混凝土 冻融损伤 孔隙结构 

分 类 号：U414[交通运输工程—道路与铁道工程]