Shear transfer in fly ash concrete with electric arc furnace aggregates

Abstract

This work experimentally evaluates the friction shear behavior of Electric Arc Furnace (EAF) concrete, compared to its reference counterpart made with natural aggregates only. For this scope, two concrete mixes were casted, both containing a blended cement with 30% of fly ash to improve their sustainability. For each mix, other than analyzing the main mechanical properties (compressive, tensile strength and elastic modulus), push-off specimens were tested to obtain the shear strength, failure modes, stress-slip and stress-crack opening curves. The results obtained here clearly identify an enhancement of the shear strength τ of EAF concrete compared to the reference, even though the relation between τ and concrete tensile strength fct is similar between the two concretes. Results are also compared with ones in literature, dealing with ordinary and recycled aggregate concrete (RAC). Further, existing models from both designing codes and literature were applied to the experimental results, obtaining conservative predictions in all cases. The safety margin for the EAF concrete was found to be higher than for the reference concrete.

Analyzing the Relationship between Compressive Strength and Modulus of Elasticity in Concrete with Ladle Furnace Slag

“…For instance, some authors have noted the deterioration of both properties following the addition of recycled concrete aggregate, due to its greater flexibility and poorer adhesion to the cementitious matrix [1,11,21]. Conversely, there is a common improvement in both properties thanks to the use of electric arc furnace slag, primarily due to its high hardness and strong bond to the matrix [6,22]. In the field of binders, the effect generally depends on the type and the method of use.…”