Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 53 2 2021 04 21 Evaluation of a by-product and enviromental-friendly chemical additives for clay soils with different mixing and curing methods Evaluation of a by-product and enviromental-friendly chemical additives for clay soils with different mixing and curing methods 659 674 3904 10.22060/ceej.2020.16461.6238 FA Amirsaeed Giahi MS student, civil engineering group, qom university of technology, qom, iran Morteza Jiryaei Sharahi Assistance prof., Civil Engineering Group, Qom University of technology 0000-0003-3775-6066 Bayramali Mohammadnezhad Civil Engineering Group, Qom University of Technology 0000-0003-3074-007X Journal Article 2019 06 01 <strong>Soil stabilization is one of the most important methods of improving the soil in geotechnical engineering.</strong><strong>Traditional stabilizers such as cement and lime have long been used and investigated, however, the use of these materials has environmental problems. Calcium lignosulphonate is a natural polymer produced from waste from the paper and timber industry.</strong><strong>In this study, the effect of adding different percentages of ligno on Atterberg limits, compressive properties, and uniaxial clay strength is investigated, the effect of ligno addition by different mixing methods on soil strength and soil morphology is also investigated.</strong><strong>The results of experiments showed that adding ligno generally improves soil mechanical properties, decreases soil plasticity index (PI), and increases soil strength and ductility.</strong><strong>For the soil used in this study, the optimum percentage of calcium lignosulfonate additive was determined 1% soil by dry weight, which was able to increase the soil resistance from 322 to 828 kPa (2.5 times increase) after 28 days.</strong> <strong>Soil stabilization is one of the most important methods of improving the soil in geotechnical engineering.</strong><strong>Traditional stabilizers such as cement and lime have long been used and investigated, however, the use of these materials has environmental problems. Calcium lignosulphonate is a natural polymer produced from waste from the paper and timber industry.</strong><strong>In this study, the effect of adding different percentages of ligno on Atterberg limits, compressive properties, and uniaxial clay strength is investigated, the effect of ligno addition by different mixing methods on soil strength and soil morphology is also investigated.</strong><strong>The results of experiments showed that adding ligno generally improves soil mechanical properties, decreases soil plasticity index (PI), and increases soil strength and ductility.</strong><strong>For the soil used in this study, the optimum percentage of calcium lignosulfonate additive was determined 1% soil by dry weight, which was able to increase the soil resistance from 322 to 828 kPa (2.5 times increase) after 28 days.</strong> https://ceej.aut.ac.ir/article_3904_c09f9caf5e08836d4673ccdd69bb041e.pdf