Changes in thermal conductivity, suction and microstructure of a compacted lime-treated silty soil during curing
Changes in thermal conductivity, suction and microstructure of a compacted lime-treated silty soil during curing
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DOI：
10.1016/j.enggeo.2016.01.008
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发表时间：
2016-03
影响因子：
7.4
通讯作者：
Yejiao Wang;Yu-Jun Cui;A. Tang;C. Tang;N. Benahmed
中科院分区：
文献类型：
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作者：
Yejiao Wang;Yu-Jun Cui;A. Tang;C. Tang;N. Benahmed
对石灰处理的粉质土在养护过程中导热系数、吸力及微观结构的变化进行了试验研究。土样采用2%石灰和最佳干压实（17%）和湿压实（22%）制备。测定了不同固化时间下的导热系数、总吸力和孔径分布。结果表明：干燥侧压实试样的导热系数随养护时间的延长略有降低，而湿侧压实试样的导热系数受养护时间的影响不显著；在土壤含水量一定的情况下，总吸力随养护时间的延长而增大。孔隙大小分布特征主要与其成型含水量有关。当样品在干侧压实时，孔隙大小分布呈现出典型的双模态特征，即大孔和微孔。相比之下，当样品在湿侧压实时，孔径分布呈现典型的单模态特征。结果表明，随着固化时间的延长，大孔和小孔的模态尺寸均减小。
An experimental study was conducted to investigate changes of thermal conductivity, suction and microstructure of a lime-treated silty soil during curing. The soil samples were prepared with 2% lime and compacted dry (17%) and wet (22%) of optimum. The thermal conductivity, total suction and pore size distribution were determined at various curing times. Results show that the thermal conductivity of samples compacted on the dry side decreases slightly with curing time, while the curing time effect on the samples compacted on the wet side is insignificant. The total suction generally increases with curing time even though the soil water content was kept constant. The pore size distribution characteristics are mainly related to its moulding water content. As the samples are compacted on the dry side, the pore size distribution shows typical bi-modal characteristics, with a population of macro-pores and a population of micro-pores. By contrast, as the samples are compacted on the wet side, the pore size distribution shows typical uni-modal characteristics. It is found that the modal size of both the large and small pores decrease with curing time.