"The use of higher volumes of fly ash in concretes for longer service life of R.C. structures" by Central Building Research Institute

Scope

To determine the use of higher volumes of flyash in concretes for longer service life of RC structures.

Parameters

The project plans to conduct experimental investigation using two different fly ashes from two different sources of North India (Dadri and Ropar). These fly ashes will be thoroughly investigated for their roles in short term properties of concrete. The experimental investigations will include the following:

• Three different concrete mixes will be designed for three different grades (M20, M30 and M40) using OPC-43 grade cement and the two different flyashes from two different sources. Another batch of specimens will be prepared without flyash to compare the performance
• Guidelines provided by the American Concrete Institute (ACI) method will be followed while designing these mixes.
• Three different percentages of replacement (30, 40 and 50) will be studied for each grade of concrete.
• Test will be conducted on the setting properties, workability, bleeding and drying shrinkage for the fresh concrete of each batch.
• The compressive strength and its rate of development and the flexural properties will be evaluated for the mechanical properties of these concretes.
• The Accelerated tests on Carbonation, Accelerated tests on Diffusion of Chloride Ions, Re-Bar Corrosion within Flyash Concretes and Rapid Chloride Permeability test at different stages will be conducted to study the durability of these concretes.

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