Volume : I, Issue : XII, September - 2012

Design and Evaluation of High Volume Fly ash Concrete for Rigid Pavements–White Topping

Nikhil T. R.

Abstract :

Cement is the second largest material consumed after water. Now a day’s concrete pavements are gaining popularity for its own good paving properties. As such a consumption of cement is increased drastically. As cement demand increases, production also increases. Every tone of production of cement releases approximately one tones of total carbon dioxide. In many industries, including power plants, coal is used as fuel. This generates tones of coal ash, which is very difficult to dispose off, which in turn causes pollution. Thus the production of cement and electricity contributes huge amount of carbon dioxide emissions and coal ash causing environmental pollution. Fly ash contains reactive constituents and unreactive crystalline matter. Reactive constituents reacts with lime and offers hydrated minerals to impart strength and un reactive matter gives packing effect to the concrete, filling up of pores and thus increases the strength Here an attempt is being made to consume this pollution causing material to a utility by using it in concrete. Whenever concrete is used as overlay it should posses certain properties to suit for overlay, like strength, flexure, modulus of elasticity etc. because of all these reason here an attempt is being made to design a concrete mixture for M–60 grade, by using high volume fly ash into it. After the mix design, the concrete is being evaluated for overlay properties such as compressive strength, flexural strength etc. In the design of high volume fly ash concrete use of chemical admixtures is inevitable, and it is proposed to use the super plasticizer. Since the compatibility of super plasticizer is different with different cement .As such it is required to tests the compatibility of super plasticizer with cement. By the tests we can conclude that 55% replacement of cement by fly ash is the optimal percent above which strength decreases.  

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Article: Download PDF   DOI : 10.36106/ijar  

Cite This Article:

Nikhil T. R. Design and Evaluation of High Volume Fly ash Concrete for Rigid Pavements-White Topping Indian Journal of Applied Research, Vol.I, Issue.XII September 2012

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