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Evaporative drying in stabilised compressed earth materials using unsaturated flow theory

机译：基于不饱和流理论的稳定压缩土材料中的蒸发干燥

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摘要

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 1 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 ～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 ≤5, the rate of moisture transport was reduced. They were quicker to absorb water and to dry out (despite slightly lower evaporation rates) resulting in less surface cooling and less matric heat transfer. The converse was true for higher matric suction materials. This technique enables the controlled modification of hygric and thermal properties in stabilised earth materials.
机译：饱和和不饱和稳定土材料的蒸发干燥通过一维尖锐湿锋近似进行了解释。使用不饱和流动理论描述了吸附和解吸的机理。讨论了第1阶段和第2阶段蒸发干燥速率的概念，并与土壤材料中的水分条件值进行了讨论，并明确描述了各阶段之间的过渡。提出了一种在基质结构内获得大范围空隙尺寸分布（VSD）的方法，其中大于或小于阈值直径的颗粒质量比例确定了PSD的最大值和最小值，然后可以通过改变压实能量在理论上进行控制。对于本研究中使用的PSD范围，设定的阈值直径为3.35 mm，目标比值约为5，用于与吸力有关的变量的参数分析。稳定土材料的实验测试表明，对于3.35比率≤5的低基质吸力材料，水分传输速率会降低。它们吸收水更快并变干（尽管蒸发速率略低），从而导致较少的表面冷却和较少的基质传热。相反，对于更高基质的吸力材料，情况确实如此。这项技术可以控制稳定土质材料中的热和热性能。

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