Evaporative drying in stabilised compressed earth materials using unsaturated flow theory
Evaporative drying in stabilised compressed earth materials using unsaturated flow theory
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DOI：
10.1016/j.buildenv.2009.07.003
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发表时间：
2010-03-01
影响因子：
7.4
通讯作者：
Allinson, D.
中科院分区：
文献类型：
--
作者：
Hall, M. R.;Allinson, D.
用一维尖锐湿锋近似解释了饱和和非饱和稳定土材料的蒸发干燥。用非饱和流动理论描述了吸附和解吸的机理。第一阶段和第二阶段蒸发干燥速率的概念与土壤材料中的水分条件值有关，并清楚地描述了各阶段之间的过渡。提出了一种在基质结构中获得大范围空隙尺寸分布(VSD)的方法，其中高于或低于阈值直径的颗粒质量比例确定了空隙尺寸分布的最大值和最小值，然后从理论上可以通过改变压实能量来控制空隙尺寸分布。对于本研究中使用的PSD范围，阈值直径设置为3.35 mm，目标比类似于5，用于吸力相关变量的参数分析。稳定土材料的试验测试表明，对于低基质吸力材料，比例为3.35
The evaporative drying of saturated and unsaturated stabilised earth materials is explained using the 1-dimensional sharp wet front approximation. The mechanisms of both sorption and desorption are described using unsaturated flow theory. The concepts of Stage I and Stage 2 evaporative drying rates are discussed in relation to moisture condition values in earth materials with a clear description of the transition between stages. An approach towards obtaining a wide range of void size distributions (VSD) within the matric structure is presented where mass proportioning of granular particles above & below a threshold diameter establishes maximum and minimum values for PSD, which can then be theoretically controlled by varying compaction energy. For the PSD range used in this study, a threshold diameter of 3.35 mm was set and a target ratio of similar to 5 was used for parametric analysis of suction-related variables. Experimental testing of stabilised earth materials showed that, for low matric suction materials where 3.35 ratio