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Authors
Affiliations
1 Dept. of Civil Engg., K.L.N. College of Engineering, Madurai-630 611, T. N., IN
2 B & F op, L&T, ECC Div., Chennai, T. N., IN
3 Dept. of Civil Engg., Sethu Institute of Technology, Kariapatti-626 106, T.N., IN
4 Dept. of Civil Engg., Alagappa Chettiyar College of Engineering & Technology, Karaikudi, T. N., IN
Source
Nature Environment and Pollution Technology, Vol 9, No 2 (2010), Pagination: 427-432
Abstract
Fly ash, which was once an environmental pollutant, has now found a good place in the construction industry, mainly in production of blended cement. Blended cement has replaced ordinary Portland cement (OPC) to a major extent, in lieu of its increased durability and lesser cost. In addition there is reduction in green house gases in the manufacturing of cement, thereby reducing pollution. The main aim of this work is to study the effect of sulphate attack in OPC and blended cement made by replacement of OPC with fly ash by 10%, 20% and 30%. When the analysis of concrete reveals a high sulphate content this does not necessarily indicate any deterioration although conversely, loss of strength or visibledeterioration accompanied by high sulphate content would be evidence of sulphate attack. The properties were monitored periodically to examine durability. Here, an attempt is made to know the effect of sulphate attack on blended cement bymonitoring the properties like densityvariation, compressive strength and water absorption.The test results discussed above conclude the effect of sulphate attack on OPC specimens and OPC specimens replaced with fly ash. The deterioration starts significantly after 60 days of curing in all cases. The concrete is good in sulphate resistant when fly ash is added. The fly ash added specimens performed better than OPC specimens. The result of the study indicated that the replacement of cement with 20% fly ash improved the durability of concrete to a larger extent. The final strength reduction for the specimens attacked by magnesium sulphate solution were higher than that those attacked by sodium sulphate solution.
Keywords
Blended Cement Concrete, Sulphate Attack, Fly Ash, Water Sorptivity.
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