Eliaslankaran Zahraalsadat, Daud Nik Norsyahariati Nik, Yusoff Zainuddin Md, Rostami Vahid
Civil Engineering Department, Engineering Faculty, Universiti Putra Malaysia, Seri Kembangan 43300, Malaysia.
Materials (Basel). 2021 Feb 28;14(5):1140. doi: 10.3390/ma14051140.
Coastal accretion and erosion are unavoidable processes as some coastal sediments undergo modification and stabilization. This study was conducted to investigate the geotechnical behavior of soil collected from Bagan Lalang coast and treated with lime, cement, and rice husk ash (RHA) to design a low-cost alternative mixture with environmentally friendly characteristics. Laboratory tests were carried out to analyze the physical properties of the soil (Atterberg limits and compaction properties), together with mechanical characteristics (direct shear and unconfined compressive strength (UCS) tests) to determine the effect of different ratios of stabilizer/pozzolan on the coastal soil and the optimum conditions for each mixture. Part of the purpose of this study was also to analyze the shear behavior of the coastal soil and monitor the maximum axial compressive stress that the treated specimens can bear under zero confining pressure. Compared to the natural soil, the soil treated with lime and rice husk ash (LRHA) in the ratio of 1:2 (8% lime content) showed a tremendous increase in shear stress under the normal stress of 200 kPa. The strength parameters such as the cohesion (c) and internal friction angle (ϕ) values showed a significant increase. Cohesion values increased considerably in samples cured for 90 days compared to specimens cured for 7 days with additional LRHA in the ratio of 1:2 (28%).
由于一些海岸沉积物会发生变化和稳定，海岸堆积和侵蚀是不可避免的过程。本研究旨在调查从巴干拉浪海岸采集的土壤的岩土工程特性，并对其进行石灰、水泥和稻壳灰（RHA）处理，以设计一种具有环保特性的低成本替代混合物。进行了实验室测试，以分析土壤的物理性质（阿特贝格界限和压实特性）以及力学特性（直剪试验和无侧限抗压强度（UCS）试验），以确定不同比例的稳定剂/火山灰对海岸土壤的影响以及每种混合物的最佳条件。本研究的部分目的还在于分析海岸土壤的剪切行为，并监测处理后的试样在零围压下能够承受的最大轴向压应力。与天然土壤相比，按1:2比例（石灰含量8%）用石灰和稻壳灰（LRHA）处理的土壤在200 kPa正应力下的剪应力大幅增加。诸如黏聚力（c）和内摩擦角（ϕ）值等强度参数显著增加。与养护7天的试样相比，养护90天的试样中，按1:2比例（28%）添加额外LRHA时，黏聚力值大幅增加。
