Keywords

High performance concrete, durability, carbonation, chloride migration, electrical resistivity, saltscaling

Abstract

An experimental study was conducted to evaluate the performance of high performance non-air entrained concrete containing various supplementary cementitious materials. Concrete was prepared for constant value of slump and water-binder ratio. Fresh properties were determined in terms of slump and air content, whereas, hardened properties were investigated in terms of mechanical and durability tests. The maximum carbonation depth observed for concrete exposed for a period of sixteen weeks containing 40% pulverized fuel ash and 7.5% microsilica was about 5 mm. The non-steady state migration and diffusion coefficient of concrete containing different type of supplementary cementitious materials were observed to be appreciably lesser than that of the control concrete. The coefficient was noted to be least one for concrete with 15% microsilica. When 7.5% microsilica was used in 40% pulverized fuel ash and 50% ground granulated blast-furnace slag concrete, the improved resistivity (in terms of lower value) was observed than that exhibited by 15% microsilica concrete. However, both the ternary mixes showed better resistivity values when compared with control concrete. The scaled mass in kg/m2 for 40% pulverized fuel ash concrete was the maximum among all the mixes. Addition of 7.5% microsilica in concrete did not cause any considerable change in the scaled mass. However, the increased content (15%) of microsilica behaved excellently in reducing the scaled mass. Ternary mixes of 40% pulverized fuel ash and 50% ground granulated blast-furnace slag concrete were found to show reduction in scaled mass.

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Durability Properties of High Performance Concrete Containing High Volumes of Supplementary Cementitious Materials

An experimental study was conducted to evaluate the performance of high performance non-air entrained concrete containing various supplementary cementitious materials. Concrete was prepared for constant value of slump and water-binder ratio. Fresh properties were determined in terms of slump and air content, whereas, hardened properties were investigated in terms of mechanical and durability tests. The maximum carbonation depth observed for concrete exposed for a period of sixteen weeks containing 40% pulverized fuel ash and 7.5% microsilica was about 5 mm. The non-steady state migration and diffusion coefficient of concrete containing different type of supplementary cementitious materials were observed to be appreciably lesser than that of the control concrete. The coefficient was noted to be least one for concrete with 15% microsilica. When 7.5% microsilica was used in 40% pulverized fuel ash and 50% ground granulated blast-furnace slag concrete, the improved resistivity (in terms of lower value) was observed than that exhibited by 15% microsilica concrete. However, both the ternary mixes showed better resistivity values when compared with control concrete. The scaled mass in kg/m2 for 40% pulverized fuel ash concrete was the maximum among all the mixes. Addition of 7.5% microsilica in concrete did not cause any considerable change in the scaled mass. However, the increased content (15%) of microsilica behaved excellently in reducing the scaled mass. Ternary mixes of 40% pulverized fuel ash and 50% ground granulated blast-furnace slag concrete were found to show reduction in scaled mass.