A Predictive Model for the Elastic Modulus of High-Strength Concrete Based on Coarse Aggregate Characteristics

Abstract

To investigate the influence of coarse aggregate parent rock properties on the elastic modulus of concrete, the mineralogical properties and stress-strain curves of granite and dolomite parent rocks, as well as the strength and elastic modulus of mortar and concrete prepared with mechanism aggregates of the corresponding lithology, and the stress-strain curves of concrete were investigated. In this paper, a coarse aggregate and mortar matrix bonding assumption is proposed, and a prediction model for the elastic modulus of mortar is established by considering the lithology of the mechanism sand and the slurry components. An equivalent coarse aggregate elastic modulus model was established by considering factors such as coarse aggregate particle size, volume fraction, and mortar thickness between coarse aggregates. Based on the elastic modulus of the equivalent coarse aggregate and the remaining mortar, a prediction model for the elastic modulus of the two and three components of concrete in series and then in parallel was established, and the predicted values differed from the measured values within 10%. It is proposed that the coarse aggregate elastic modulus in high-strength concrete is the most critical factor affecting the elastic modulus of concrete, and as the coarse aggregate elastic modulus increases by 27.7%, the concrete elastic modulus increases by 19.5%.

Keywords

elastic modulus / prediction model / mineralogical / influence mechanism

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