Investigating soil-water retention characteristics at high suctions using Relative Humidity control
Investigating soil-water retention characteristics at high suctions using Relative Humidity control
复制标题
使用相对湿度控制研究高吸力下的土壤保水特性
DOI：
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复制
发表时间：
2016
期刊：
影响因子：
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通讯作者：
J. Standing
中科院分区：
文献类型：
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作者：
V. Mantikos;S. Ackerley;A. Kirkham;A. Tsiampousi;D. Taborda;J. Standing
提出了一种控制相对湿度的技术，它涉及在计算机调节的相对湿度下向密封室提供连续的空气流。所需的相对湿度值是通过适当体积的干空气和湿空气混合来实现的，并通过电容式相对湿度传感器在腔室中的三个位置处进行测量以用于伺服控制，并通过敏感的VAISALA传感器进行检查。该装置能够稳定、连续地控制相对湿度，相对湿度偏差小于0.2%。采用该技术测定了静态压实伦敦粘土在自由膨胀和定体积条件下的湿土-水特征曲线。室内的相对湿度以逐步的方式增加，每一步保持直到室内气氛和土壤样品之间建立蒸汽平衡。独立的滤纸测量进一步验证了该方法，而所获得的保留曲线补充了文献中较低范围的吸力。
A technique for controlling relative humidity (RH) is presented, which involves supplying a sealed chamber with a continuous flow of air at a computer-regulated RH. The desired value of RH is achieved by mixing dry and wet air at appropriate volumes and is measured for servo-control at three locations in the chamber with capacitive RH sensors and checked with a sensitive VAISALA sensor. The setup is capable of controlling RH steadily and continuously with a deviation of less than 0.2% RH. The technique was adopted to determine wetting soil-water retention curves (SWRC) of statically compacted London Clay, under both free-swelling and constant volume conditions. The RH within the chamber was increased in a step-wise fashion, with each step maintained until vapour equilibrium between the chamber atmosphere and the soil samples was established. Independent filter paper measurements further validate the method, while the obtained retention curves complement those available in the literature for lower ranges of suction.
影响因子：
1.7
作者：
M. Mavroulidou;Xiwei Zhang;M. Gunn;Z. Cabarkapa
通讯作者：
M. Mavroulidou;Xiwei Zhang;M. Gunn;Z. Cabarkapa