Better utilization of fly ash and other SCMs in lean concrete and durable concrete pavements and structural concrete applications
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The achievement of sustainable development has been a major challenge facing the concrete industry for years. Recently, there have been changes, both technical and policy driven, that have the potential to affect the availability of classified fly ash (CFA) and finding alternative supplementary cementitious materials (SCMs) is a critical issue. Run-of-station fly ash (RFA) can be a possible alternative to CFA. In this investigation, an experimental study has been carried out to evaluate the effect of fineness of fly ash on the heat of hydration, microstructure, flow and compressive strength of blended cement pastes. The study has been extended to assess the influence of fineness, types and levels of SCMs (fly ash, slag or metakaolin) on the fresh, hardened and durability properties of mortars and different concrete applications. This experimental investigation has demonstrated the value and benefits of using RFA as an alternative SCM in concrete. RFA has proven abilities to achieve the same level of performance as CFA by only adjusting the mix design such as lowering w/b ratio when used in various concrete applications. SL and MK could also be used as other alternatives to CFA in concrete.
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