阿太堡极限
冻胀
抗压强度
阳离子交换容量
环境科学
加州承载比
稳定器(航空)
霜冻(温度)
土工试验
土壤pH值
土壤科学
材料科学
岩土工程
土壤水分
化学
复合材料
地质学
工程类
机械工程
作者
Yaowu Liu,Wenle Zheng,Qing Wang,Chengjun Cao,Mushi Chang,Irene Rocchi
标识
DOI:10.1016/j.jclepro.2019.119504
摘要
This study investigates using Sulfur-Free Lignin (SFL) as a stabilizer to reinforce soil for civil engineering construction. To comprehensively evaluate the engineering performance of SFL stabilized soil, 3, 7, 10, 12 and 15% mixtures were tested and the influence of climate factors (assessed subjecting the soil to different freeze-thaw cycles) was also considered. The experimental program investigated mechanical strength (unconfined compressive strength) and physicochemical properties, which included grain size distribution, Atterberg limits, variation of elemental and mineral composition, pH, cation exchange capacity, X-ray diffraction/fluorescence and thermal conductivity. In addition, micro-characterization through SEM and pore size distribution was also performed. A considerable improvement of the mechanical properties was observed, which increases with SFL content up to 12%. This was based on changes in the physical and not chemical properties, hinting that the stabilization mechanism consists in physical binding unlike for traditional soil stabilizers. Moreover, it was found that SFL addition improved frost resistance. Based on these results, utilizing SFL as a soil stabilizer for application in earthworks shows great potential and would promote the bio-ethanol industry and engineering construction to be more sustainable and greener, particularly because it does not risk inducing soil pH contamination unlike traditional chemical agents.
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