Utilization of Fly Ash in Rural Road Construction in India and its Cost Effectiveness
Lecturer in Applied Mechanics , B.E College (D.U), Howrah, India
Amartya Kumar Bhattacharya
Senior Lecturer in Applied Mechanics , B.E College (D.U), Howrah, India
Sri L. K. Paira
Assistant Engineer, P & R.D. Department, Govt. of West Bengal, India
In construction of rural roads in low lying or flood prone areas, fly ash should have to be considered as normal choice in near future. The physical and chemical properties of fly ash are reviewed first. Then the utilisation of fly ash in road works is discussed. The cost effectiveness of the utilization, especially in rigid pavement construction, is studied.
From the illustrations and discussions, it is found that fly ash can be used economically for embankment construction in the vicinity of thermal power stations when lead distances are appropriate. In case of rigid pavements, usage of fly ash leads to considerable savings even if fly ash is to be transported over large distances. For rigid pavement construction in a large scale, part replacement of cement by dry fly ash is found acceptable. In case of bridge and other hydraulic structures fly ash may be used as a backfill material with necessary earth cover at approach to reduce surcharge, as cinders are not easy available now-a-days. Recommendations are made on the attention to be paid to characterization of fly ash and quality control during construction of road pavement and embankment for better performance of such road sections so that fly ash can be turned from a liability to an asset.
Keywords: Fly ash, rigid pavement construction, embankment construction, bridge backfill
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