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Item Laboratory Investigation of Black Cotton Soil Modified with Bioenzyme and Aggregates for Pavement Subgrade(Springer Science and Business Media Deutschland GmbH, 2021) Chitragar, S.F.; Shivayogimath, C.B.; Mulangi, R.H.The major component of the pavement layer is subgrade soil, but the availability of good quality of subgrade soil is not abundantly available in most part of the South India, which includes North Karnataka, Maharashtra, Madhya Pradesh and Gujarat, due to the presence of clayey soil or Black cotton BC soil. This soil is having high plasticity index, high volumetric change behavior and poor load carrying capacity, hence it is not suitable for subgrade layer of the pavement. As there is a shortage of availability of good quality soil so the alternate solution is to stabilize the existing weak soil to meet out the design requirement. There are so many stabilizers available in the market, to overcome this problem. Now a day, nontraditional soil stabilizer called bioenzyme is emerging in the market, which is nontoxic, biodegradable and ecofriendly. In this investigation, attempt had made to study the stabilization of black cotton soil by using bioenzyme with dosages like 0, 50, 100, 150, 200 and 250 ml/m3 of soil and bioenzyme with 20% of stone aggregates (passing from 6.3 mm and retained on 4.75 mm sieve) are used. Unconfined compressive strength UCS test with different curing periods and California bearing ratio test CBR for unsoaked and soaked conditions was carried out to study the change in strength parameter and to study the reduction in swelling parameter of soil, Free swell index (FSI) was conducted. The experimental results show the increased UCS value from 170 to 435 and 553 kPa for 28 days curing. CBR results are increased from 1.2% to 2.4 and 5.4 for soaked CBR and 4.5 and 8.5% unsoaked CBR. Free swell index (FSI) decreased from 130 to 65%. © 2021, Springer Nature Singapore Pte Ltd.Item Study on Physical and Chemical Change Behavior of Stabilized Black Cotton Soil for Pavement Subgrade(Springer Science and Business Media Deutschland GmbH, 2021) Chitragar, S.F.; Shivayogimath, C.B.; Mulangi, R.H.The soil in the highway material as subgrade plays an important role in the pavement component, which is an integral part of pavement. It is desirable to have the pavement with the good subgrade soil. But this is challenging in the case when the subgrade soil is expansive in nature. In order to obtain the better performance, various soil stabilizers are used to improve the subgrade soil properties. In the present study black cotton soil is used which is expansive in nature and is treated with conventional additive Lime with the dosage of (2, 4, 6, 8, 10% by weight of soil) and non conventional additive. Terrazyme with (50–250 ml/m3 of soil) with the increment of 50 ml and chemical based additive Terrasil with (0.2–1.0 kg/m3) with the increment of 0.2 kg/m3. The study aimed to identify the physical & chemical change behavior of soil when it is stabilized with different additives. Chemical modification in the soil due to additives plays an important role in physical modification of soil. Laboratory test program was aimed at evaluating the potential chemical parameters such as: pH, Silica, Aluminium oxide, Ferrous oxide, Chlorides, Sulphates, Calcium oxide and Magnesium oxide that are responsible to increase the strength and volumetric change behavior of modified soil treated with various additives. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.