Design of Rigid Pavement by Using Fly Ash as a Stabilizing Material

Abstract

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 pozzolonic effect or an inherent self hardening property under favorable conditions of moisture and compaction. This project aim is to study the effect of fly ash on an expansive soil for rigid pavement design and to reduce the quantity of lime in lime fly ash by the effective use of fly ash itself. Some percentage of fly ash without any additive was utilized so as to reduce the cost of construction and this is a good method for disposal of it. Initially the index properties of the soil were studied by conducting liquid limit, plastic limit, shrinkage limit, grain size analysis and specific gravity tests. CBR, OMC and swell index tests confirmed that the soil had taken was clay which is highly expansive in nature.

Compressive strength and soaked CBR tests will be conducted for various proportions of Fly ash and optimum contents were obtained and found that soil strength improved. If the locally available soil is good in nature pavement construction becomes easier and cheaper. But if the soil is weak in nature instead of going for an alternative, which costs higher the available soil can be modified by adding this type of stabilize which involves low cost.