Conference Publication Details
Mandatory Fields
Gavigan D., Goggins J.
Bridge and Concrete Research in Ireland (BCRI2010)
Investigation of fly ash from peat fired power stations as a cement replacement in concrete
Optional Fields
Supplementary cementious materials Cement Concrete Peat Power stations
Ordinary Portland Cement (OPC) is the most expensive and energy intensive ingredient in concrete. Due to the manufacturing process associated with cement production, for every tonne of cement produced almost as much CO2 can be released into the atmosphere. Therefore, it is imperative that alternative cement replacements are developed that produce either less greenhouse gas emissions in their production or are waste and/or by-products. This study investigates the use of two fly ashes from the combustion of peat and the co-firing of peat with wood, which are currently waste products, as alternative binders to OPC. These materials are cost-effective and their use in concrete can benefit the environment, as the alternative may be to dispose of them in landfills. The effects these ashes have on the properties of fresh and hardened concrete is investigated. Concrete with a cement replacement level of 10% and 20% of both materials is tested in terms of workability and strength at 3, 7, 14 and 28 days. All results are compared to a control mix. Compressive strength testing was carried out on 100mm cubes, 150mm cubes and 150mm x 300mm cylinders. Correlations between compressive strength results from the three different types of specimens are presented. The findings from this study suggest that there is potential for peat fly-ash to be used as a cement replacement.
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