Tensile strength behaviour of recycled aggregate concrete: Fid-Bau Portal

Tensile strength behaviour of recycled aggregate concrete

Silva, R.V. / de Brito, J. / Dhir, R.K.

Highlights • State of the art review on the effect of recycled aggregates on tensile strength. • Use of EC2 prediction model to estimate tensile strength of recycled aggregate concrete. • Proposal of coefficients, compatible with EC2, for tensile strength gain over time. • Relationship between the tensile and compressive strength of recycled aggregate concrete. • The relationship proposed in EC2 is followed by recycled aggregate and conventional concretes.

Abstract This paper provides a systematic literature review, based on the identification, appraisal, selection and synthesis of publications relating to the effect of incorporating recycled aggregates, sourced from construction and demolition wastes, on the tensile strength of concrete. It identifies various influencing aspects related to the use of recycled aggregates such as replacement level, size and origin, as well as mixing procedure, chemical admixtures, additions and strength development over time. In this paper, estimated values, using the Eurocode 2 method to determine the tensile strength over time, were compared with the actual measured values, showing little correlation and therefore new coefficients are proposed. This paper also presents the relationship between the tensile and compressive strengths according to Eurocode 2. The results suggest that, regardless of the replacement level, type, and quality of the recycled aggregate used, the resulting recycled concrete tends to exhibit a similar relationship to that of the corresponding natural aggregate concrete.