Enhancement of Strength Characteristics of Poorly Graded Soil by Flyash and Cement

Fly Ash is the waste material, which is obtained after burning coal in Thermal Power Plants. It can be used as a stabilizer for soil due to its pozzolanic effect or an inherent self-hardening property under favourable conditions of moisture and compaction. This project aims at increasing the strength of poorly graded soils by using Fly Ash and cement as admixtures. Some percentage of Fly Ash without any additives was utilized so as to reduce the cost of construction and this is a good method for disposal of it. Fly Ash was added in various percentages like 10, 20, 30 and 40 percentages by volume . 

Initially all basic Geotechnical properties of the soil such as liquid limit, plastic limit, shrinkage limit, Grain Size Analysis, Specific Gravity, Free Swell Index, Unconfined Compressive Strength, OMC and MDD were determined. Later on the stabilized mixes were tested for CBR California Bearing Ratio which is an indirect measurement of strength. After the detailed experimental investigation it is observed that 30 addition of Fly Ash has shown maximum strengths, so that to obtain much more strengths cement was added in 2, 5, 8 and 10 percentages to this optimum mix of Fly Ash with soil. 

After that the soil mixes were tested for CBR California Bearing Ratio to check it's feasibility in Flexible Pavement constructions. The strengths were checked in both Unsoaked and soaked conditions and at various curing periods like 7 and 28 Days. Among all proportions 30 Fly Ash 8 of the cement has shown maximum strengths, so that it was decided as optimum mix. Maximum strengths were obtained at 28 days curing period for all proportions of mixes so that this period is decided as optimum curing period. Eventually this project work facilitates an economical, strong and durable construction material for Flexible Pavements.

By Kammampati Laxman | Ch. Damodhar Naidu | Bothsa Kumari "Enhancement of Strength Characteristics of Poorly Graded Soil by Flyash and Cement"

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-6 , October 2018, 

URL: http://www.ijtsrd.com/papers/ijtsrd18888.pdf

Direct Link: http://www.ijtsrd.com/engineering/civil-engineering/18888/enhancement-of-strength-characteristics-of-poorly-graded-soil-by-flyash-and-cement/kammampati-laxman

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