Stabilisation of soil Research Papers (original) (raw)

According to IRC recommendation, the California bearing ratio (CBR) value of subgrade is used for design of flexible pavements. The design of pavement may affect by the material which is used as pavement material. Black Cotton soil is expansive soil which expand when it contacts with water and this is the major reason of failure of black cotton soil strata. The engineering properties of black cotton soil may be used by fibre, ash, lime and sludge etc. CBR value depends on the liquid limit (W l), Plastic limit (W p), plasticity index (I p), maximum dry density, optimum moisture content, swelling pressure, degree of expansiveness and permeability of soil or mix specimen. These tests are performed in laboratory. This research paper deals with design of flexible pavement by using black cotton soil with 20% sugarcane bagasse ash (SCBA) and different percentage of Coir Fibre. In this research, the fibre (Aspect ratio 60) is mixed from 0.25% to 1.25% in mix of black cotton soil + 20% SCBA. The engineering parameters are also determined by performed tests. For studying the behaviour of black cotton soil with different percentage of sugarcane bagasse ash, the Atterberg's limits (Liquid Limit, Plastic Limit, Plasticity Index), standard proctor test, California Bearing Ratio are performed.

- by and +1
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- Road Pavement Engineering and Design, Flexible Pavement Design, Stabilisation of soil, STABILIZATION OF EXPANSIVE SOILS

Fly ash from thermal power plants can be a resource of micronutrients but with poor disposal could manifest into a serious environmental threat. Fly ash escaping into the atmosphere is a major problem and in order to understand to this problem, a study was conducted to test the application of fly ash to agricultural soil in varying concentrations and its effects on early plant growth. In the present study to understand the effects of various concentrations of fly ash (10mg, 50mg, 75mg, and 100mg) on growth and yield responses of Vigna acontifolia L. and Pennisetum glaucum L. The seeds were aseptically sown on the solidified agar previously mixed with varying concentrations of fly ash in multi well plates. Each treatment was replicated in a randomised design and observed over a period of 7 days. The seedlings were studied for their response based on germination rate, seed, vigour index, length of radicle, length of plumule and fresh weight against seeds germinated using distilled water as control. The intensity of inhibitory effect on all other parameters was directly proportional to the concentration of fly ash employed and inhibition was most prominent from 75mg. Based on the overall health of the seedling, the observed effect of coal fly ash was pronounced in Vigna acontifolia L. than Pennisetum glaucum L.

- by nitesh joshi
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- Flyash, Stabilisation of soil

Expansive soils have the tendency to undergo volume change behaviour and cause huge uplift pressures and upheaval of structures based on it due to presence of moisture. In most of cases, practically it is not possible to avoid expansive soil and replacement of soil by any material or soil, in large area of expansive soil. The black cotton soil is type of expansive soil. For the treatment of black cotton soil, various materials add in black cotton soil. These materials work as admixture in black cotton soil and stabilize the soil. In this research work, black cotton soil (expansive soil) is stabilized by using 5% sugarcane bagasse ash (SCBA) and different percentage of Recron 3s from 0.5% to 2.5% weight of black cotton soil mix specimen of 5% SCBA. The liquid limit, plastic limit, plasticity index, differential free swell index, swelling pressure, standard proctor test, California bearing ratio and unconfined compressive strength tests were performed in laboratory to study the behaviour of black cotton soil.