Clays that have low shear strength need to be stabilized in order to meet the technical requirements to serve as a subgrade material. One of the usual soil stabilization methods is by adding chemicals such as Portland cement, lime, and bitumen. The clay stabilization research was done by adding gypsum and paddy husk ash. The research goals were to find out the value of engineering properties of clay due to the addition of 2% gypsum and 2% - 15% paddy husk ash. The soil was classified as Clay - Low Plasticity (CL) based on USCS and was classified as A-7-6 (10) based on AASHTO classification system. The UCT value of original soil was 1.41 kg/cm~2. While the CBR soaked and unsoaked values of original soil were 4.41% and 6.23% respectively. The research results showed the addition of paddy husk ash decreased the value of unconfmed compressive strength as well as CBR. The stabilized soil by 2% gypsum and 0% paddy husk ash gave maximum UCT value of 1.67 kg/cm~2, while the maximum value of CBR were found 6.71% for CBR soaked and 8.00% for CBR unsoaked. The addition of paddy husk ash did not alter the soil classification according to AASHTO or USCS, even degrade the engineering properties of original soil.
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机译：需要稳定具有低剪切强度的粘土，以满足作为路基材料的技术要求。通常的土壤稳定方法之一是加入诸如波特兰水泥，石灰和沥青等化学品。通过添加石膏和水稻壳灰来完成粘土稳定化研究。研究目标是为了找出粘土的工程性质的价值，由于添加2％石膏和2％ - 15％的稻壳灰烬。土壤基于USCS归类为粘土 - 低塑性（CL），并基于AASHTO分类系统被归类为A-7-6（10）。原始土壤的UCT值为1.41 kg / cm〜2。虽然浸泡和原始土壤的未烘烤价值分别为4.41％和6.23％。研究结果表明，添加水稻壳灰分的增加降低了无浮动抗压强度以及CBR的值。稳定的土壤通过2％石膏和0％水稻壳灰，得到最大UCT值1.67 kg / cm〜2，而CBR浸泡的CBR和8.00％的CBR发现的最大值为8.71％。根据AASHTO或USCS，添加水稻壳灰未改变土壤分类，甚至降低了原始土壤的工程性质。
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