Nature Environment and Pollution Technology

P. Kathirvel ¹, M. Galesh ², M. Shahul Hameed ³, A. S. S. Sekar ⁴

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

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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M. Shahul Hameed ¹, A. S. S. Sekar ²

Affiliations
1 Department of Civil Engineering, Sethu Institute of Technology, Kariapatti-626 106, Tamil Nadu, IN
2 Department of Civil Engineering, Alagappa Chettiyar College of Engineering and Technology, Karaikudi, Tamil Nadu, IN

Abstract

Progress in concrete technology should necessarily take into account the widespread need for conserving resources and environment and for proper utilization of energy. Consequently, it can be expected that there will be major emphasis on the use of wastes and by-products in cement and concrete technology. Efforts will also be directed to use recycled materials such as quarry dust, marble powder and fly ash. The advancement of concrete technology can reduce the consumption of natural resources and energy sources and lessen the burden of pollutants on the environment. First, the physical and chemical properties of the waste were analysed. The strength development for various percentages of replacement of fine aggregate with quarry dust, marble powder and fly ash were compared to the strength development of normal concrete at various ages. Consequently, these contribute to improve the strength of concrete slump and air content of fresh concrete and absorption, compressive strength and flexural strength of hardened concrete were also investigated.

Keywords

Marble Powder, Fly Ash, Quarry Dust, Filler Materials, Green Concrete Slump, Compressive Strength, Flexural Strength.

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