近日，我院张虎元教授及其团队在期刊《CONSTRUCTION AND BUILDING MATERIALS》上发表题为“Shrinkage property of bentonite-sand mixtures as influenced by sand content and water salinity”的文章。现摘要如下：
【Abstract】The shrinkage of bentonite-sand mixtures may degrade the performance of a clay barrier constructed in waste disposal facilities. In this study, changes to material properties occurring when bentonite was modified by addition of sand and exposure to different pore water salinities were considered. Paste-like bentonite-sand mixtures were free-desiccated in the laboratory. Sand addition could only reduce the volumetric shrinkage of material when the percentage of sand was larger than 30%. Changes in pore water salinity also may reduce shrinkage of the material because bentonite aggregates were flocculated bysynthetic brackish groundwater based on results from particle and pore size analysis. For both effects on the bentonite, the reductions of material shrinkagecan be considered theoretically by a packing phenomenon accompanied by the evolution of a mixed grain size distribution. (C) 2019 Elsevier Ltd. All rights reserved.