论文摘要
‘Pot-cover effect’ refers to the phenomenon of moisture accumulation beneath the pavement under condensation or desublimation because the vapor transfer in the soil is blocked by the pavement. To study this phenomenon in the laboratory, we have developed the pot-cover effect apparatus with freezing-thawing cycles（PEAFC）, which consists of three parts, namely, the vapor transfer system, the temperature control system, and the temperature and water content monitoring system. The major functions of this apparatus include: simulation of both vapor transfer and freezing-thawing cycling in the soil, real-time monitoring of the temperature and the water content in soil samples, and one-dimensional heat and moisture transfer in the samples. The FDR（frequency domain reflectometry） sensors of the apparatus are calibrated and a calibration formula is proposed to eliminate the water content measurement errors induced by temperature changes. Constant temperature difference tests and a freezing-thawing cycling test are conducted with the apparatus. Results indicate that the apparatus can control the water replenishment in the soil samples, monitor the vapor transfer in the samples in real time, and simulate the vapor transfer process under the condition of the freezing-thawing cycling in the soil. These tests verify the effectiveness and reliability of the apparatus, which indicates that the development purpose is achieved.
论文目录
文章来源
类型: 期刊论文
作者: LUO Ting,CHEN Han,YAO YangPing,WANG NaiDong,QU Xiao
来源: Science China(Technological Sciences) 2019年09期
年度: 2019
分类: 工程科技Ⅱ辑
专业: 公路与水路运输
单位: School of Transportation Science and Engineering, Beihang University
基金: supported by the National Program on Key Basic Research Project of China(Grant No.2014CB47006),the National Natural Science Foundation of China(Grant Nos.51579005&11272031)
分类号: U416.0
页码: 1636-1648
总页数: 13
文件大小: 1107K
下载量: 28
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