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混凝土与制品
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路用泡沫混凝土耐久性研究

作者：冉隆举1，牛海波2，刘胜华2，陈锋2，匡渝阳3

关键字：路,用,泡沫,混凝土,耐久性,研究,贵州,

　
（1.贵州高速公路集团有限公司，贵州 贵阳  550009；2.浙江交工宏途交通建设有限公司，浙江 杭州  310051；
3.常山安欣建设有限公司，浙江 衢州  324000）
摘要：分别对路用泡沫混凝土进行循环荷载、冻融循环、海水侵蚀和大气暴露等试验，分析试验前后试件无侧限抗压强度的变化规律，以评价其耐久性。结果表明：循环荷载作用次数、加载幅值和加载均值增加及海水浸泡时间延长时路用泡沫混凝土的耐久性逐渐下降；冻融次数增加时，耐久性则先提高后下降，但荷载和冻融耦合作用时，试件耐久性下降速率明显高于二者单一作用；大气暴露时则是随暴露时间的延长，耐久性先提高后下降，最后基本不变，且试件最终稳定的无侧限抗压强度高于暴露初期强度。为提高路用泡沫混凝土耐久性，建议施工中严格控制其上路面结构的平整度，并加强其28 d后的养护，且对于冻融或海水侵蚀地区应采取措施进行防治。
关键词：道路工程；路用泡沫混凝土；耐久性；无侧限抗压强度
中图分类号：TU528.2        文献标识码：A        文章编号：1001-702X（2019）07-0020-04
 
Study on durability of foamed concrete for road
RAN Longju1，NIU Haibo2，LIU Shenghua2，CHEN Feng2，KUANG Yuyang3
（1.Guizhou Expressway Group Co. Ltd，Guiyang 550009，China；2.Zhejiang Jiaotong Hongtu Traffic Construction Co. Ltd.，Hangzhou 310051，China；3.Changshan Aanxin Construction Co. Ltd.，Quzhou 324000，China）
Abstract：In order to master the durability of road foam concrete，the cyclic loading，freeze-thaw cycling，seawater erosion and atmospheric exposure tests of road foam concrete were carried out，respectively. Furthermore，the change law of unconfined compressive strength before and after test is analyzed for evaluate its durability. The results show with the increase of cyclic loading times，loading amplitude，loading mean，seawater immersion time，the durability of road foam concrete gradually decreases，and with the increase of freeze-thaw cycling times，the durability becoming firstly increases and then decreases. However，when the load is coupled with the freeze-thaw，the rate of durability degradation of the specimen is obviously higher than that the single action of both. At atmospheric exposure，the durability becoming firstly increases and then decreases with the extension of exposure time，and finally remains unchanged，and the unconfined compressive strength of the specimen of finally stable is higher than the initial intensity of exposure. In order to improve the durability of road foam concrete，it is recommended to strictly control the roughness of the pavement structure during construction，and strengthen its maintenance after 28 days. In addition，the measures should be taken for prevention and control in areas with freeze-thaw or seawater erosion.
Key words：road engineering，road foam concrete，durability，unconfined compressive strength