A study of the effectiveness of the use of gypsum and volcanic ash against the stability of clay soil in terms of UCT and CBR values

TALENTA - Conference on Engineering, Science and Technology 2017

工业技术;自然科学

Roesyanto^1 ; Iskandar, R.^1 ; Hastuty, I.P.^1 ; Lubis, A.I.U.^1

Civil Engineering Department, University of Sumatera Utara, Medan, Indonesia^1

关键词: Classification system;    Clay stabilization;    Engineering properties;    Low plasticities;    Research purpose;    Research results;    Soil stabilization;    Stabilized soils;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/309/1/012025/pdf
DOI  :  10.1088/1757-899X/309/1/012025

来源: IOP

【 摘 要 】

Soil stabilization is an effort to improve engineering properties of soil. The conventional soil stabilization is by adding additives to the soil such as Portland cement, lime, and bitumen. The clay stabilization research was done by adding gypsum and volcanic ash. The research purposes were to find out the value of engineering properties of clay due to the addition of 2% gypsum and 2%-15% volcanic 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 values of original soil and original soil plus 2% gypsum were 1.40 kg/cm2and 1.66 kg/cm2respectively. The CBR soaked and unsoaked values of original soil were 4.44% and 6.28% correspondingly. Meanwhile, CBR soaked and CBR unsoaked values of original soil plus 2% gypsum were 6.74% and 8.02% respectively. The research results showed that the additives materials of gypsum and volcanic ash improved the engineering properties of clay. The UCT result from the stabilized soil by 2% gypsum and 10% volcanic ash gave value of 2.79 kg/cm2(increased 99.28% from original soil). For CBR test, the most effective mixture were in variation of 2% gypsum and 9% volcanic ash which gave value of 9.07% (104.27% increase from original soil) for CBR soaked and 10.29% (63.85% increase from original soil) for CBR unsoaked. The stabilized soil with 2% gypsum and 9% volcanic ash was classified as CL based on USCS and was classified as A-6 (4) based on AASHTO classification system.