Effect of Elevated Temperature Curing on Compressive Strength and Electrical Resistivity of Concrete with Fly Ash and Ground-Granulated Blast-Furnace Slag

This paper presents results regarding the effect of elevated temperature (ET) curing on the compressive strength and electrical resistivity of concrete with slow-reacting supplementary cementitious materials (SCMs). Concrete mixtures with Class F fly ash (FA), ground-granulated blast furnace slag (GGBS), or both were tested. Elevated temperature (ET) curing (in a 36 degrees C [97 degrees F] lime water bath) and room-temperature (RT) curing (in a 21 degrees C [70 degrees F] lime water bath) with different durations were investigated. Test results show that the ET curing method can be employed to achieve the specified 28-day compressive strength and resistivity values on concrete with slow-reacting SCMs without compromising the long-term strength and resistivity properties. It is also shown that the use of granite as coarse aggregate as an alternative to limestone can increase concrete's electrical resistivity but has a modest adverse effect on the compressive strength of not fully hydrated concrete.