Abstract
This paper proposes a design model (2D MSDM) for assessment the early-age stress-strain parameters of two-axially restrained expansive concrete elements. The analytical model allows defining the restrained expansion strains and corresponding self-stresses in case of arbitrary restraint conditions in orthogonal directions by taking into consideration the elastic-plastic behavior of concrete during the expansion period. The results of solution according to the proposed model were compared with the experimental results of expansive concrete elements with orthogonal confinement carried out by authors and other researchers.
Highlights
Ordinary Portland Cement concrete is one of the most universal and most widely used construction materials, it is not without disadvantages
Expansive concrete was developed as a suitable material for compensating the inevitable shrinkage strains in concrete and for inducing its own restrained strains and the pre-stresses in reinforced concrete structures
The increase of expansive concrete in volume under restraint conditions during the hardening period produces the initial elastic compressive strains in concrete and tensile strains in confinement so leading to the socalled physico-chemical prestress of structure. This phenomenon makes the expansive concrete very useful for reinforced concrete structures produced in building site conditions
Summary
Ordinary Portland Cement concrete is one of the most universal and most widely used construction materials, it is not without disadvantages. The increase of expansive concrete in volume under restraint conditions during the hardening period produces the initial elastic compressive strains in concrete and tensile strains in confinement so leading to the socalled physico-chemical prestress of structure. This phenomenon makes the expansive concrete very useful for reinforced concrete structures produced in building site conditions. All design formulas in models [3,4,5,6,7] contain the empirical coefficients that are based on the limited experimental data that can lead to incorrect results with respect to the wide range of expansive concrete elements under two-way restraint conditions. The assessment of restrained strains and self-stresses is still a matter of concern for expansive concrete elements with reinforcement oriented in orthogonal directions
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