Compressive strength model for concrete

Abstract

A predictive compressive strength model accounting for the type of cement, cement degree of hydration, aggregates type and gradation, mixtures proportion and air content was developed. This paper presents the formulation, implementation, calibration and validation of the proposed strength model for normal concrete. The theoretical formulation postulates that particles' interaction is governed by excess paste theory from which an average paste thickness model is developed to account for concrete mixture proportions and aggregate gradation. In addition, the model accounts for the cement compressive strength and aggregate to cement paste bond strength. An experimental programme, developed to evaluate the model, accounts for the following variables: water to cement ratio, water content, bulk volume and maximum size of coarse aggregate, and air content. The proposed model is found to accurately predict the strength of concrete mixtures at 3, 7, 28 and 191 days. The measured 3-day and 28-day strength range from 8 . 5 to 32 . 7 MPa and from 13 . 6 to 43 . 8 MPa, respectively. The corresponding standard error and correlation coefficient for the 3-day predictions are 2 . 1 MPa and 0 . 95, and 1 . 8 MPa and 0 . 96 for the 28-day predictions.

Can We Truly Predict the Compressive Strength of Concrete without Knowing the Properties of Aggregates?

“…Since the effect of SP, binder content and its characteristics, the w/c and aggregate content and the parameters described in [15,16] on concrete have already been studied, this study focuses on the effects of the quality and geological nature of NA on the compressive strength of concrete when all the mentioned parameters are constant, mainly by considering two modified models shown in the next sub-section. Thus, in terms of the aggregates, it is advisable to focus on the two mentioned parameters rather than only on the source of the aggregates, e.g., NA versus RA.…”

Award-winning paper in 2013

“…The MCR Award, presented for the best paper on concrete published in Magazine of Concrete Research in any one year, was awarded to Chidiac et al (2013).…”

Non-linear models for the prediction of specified design strengths of concretes development profile

“…An overall view of concrete quality is reflected by the concrete strength [1]. In addition, compressive strength is a structural engineering performance measure, employed for designing concrete structures [2]. In practice, design engineers use different specified concrete strengths to design the structural components.…”