A new stress-strain model for concrete containing recycled concrete aggregates subjected to uniaxial compression

Driven by the value of the materials, the use of crushed concrete aggregates, usually called recycled concrete aggregates (RCAs) in structural concrete has gained increasing interest in civil engineering [1-4]. The mechanical behavior of structural concrete with RCAs needs to be adequately understood to ensure a safe and economic structural design. Nonlinear analysis, e.g. by means of the finite element method (FEM), provides a powerful tool for investigating the strength and deformation properties of concrete elements and structures. Constitutive models for concrete with RCAs are required for the nonlinear analysis of members and structures incorporating RCAs. This paper firstly presents a comprehensive review of the existing test data on the stress - strain curve of concrete containing RCAs under uniaxial compression. The main characteristics of the observed stress - strain curve are summarized. A comparison of available models for the stress –strain relation of concrete with RCAs in the literature is also performed. The accuracy of the existing stress-strain models is evaluated through comparing the model predictions with the test data. A new stress-strain model for concrete with RCA under uniaxial compression is then proposed with emphasis on the influence of the amount and the quality of RCAs on the post-peak softening branch. In addition, new models for predicting the modulus of elasticity and the strain at peak stress for concrete with RCA are also developed. It is found that the proposed stress-strain model, in combination with the developed models for the modulus of elasticity and the strain at peak stress is able to provide a good description of the stress-strain response of concrete with RCAs under uniaxial compression.

ISBN:9788365550200

Jaar van publicatie:2019

BOF-keylabel:ja

IOF-keylabel:ja

Authors from:Higher Education