Tensile behavior of rebar-reinforced coarse aggregate ultra-high performance concrete (R-CA-UHPC) members

Experiments and restrained shrinkage creep effect

Journal article (2024)

Authors

Zhanchong Shi Tongji University, Norwegian University of Science and Technology (NTNU)

M. Liang Materials and Environment -

Qingtian Su Shanghai Engineering Research Center of High Performance Composite Bridges, Tongji University

T. Kanstad Norwegian University of Science and Technology (NTNU)

Liberato Ferrara Politecnico di Milano

Research Group

Materials and Environment () (TU Delft)

Axial tensile response CA-UHPC members First cracking strength Restrained shrinkage Tensile creep

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Published Date

2024

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

Abstract

Rebar-reinforced coarse aggregate ultra-high-performance concrete (R-CA-UHPC) has been used in the construction of new structures and strengthening of deteriorated aged infrastructures, and it inevitably sustains tension. To study the tensile behavior of R-CA-UHPC members, axial tensile tests for dog-bone-shaped specimens were designed and conducted. The investigated variables included reinforcement ratio in terms of rebar quantity/diameter, and concrete type (CA-UHPC vs. normal concrete). The test results showed that the improved rebar/CA-UHPC bond property prevents the emergence of splitting cracks, but intensifies the crack localization for CA-UHPC and strain concentration for rebar after yielding. Moreover, the restrained effect of rebar on free shrinkage of CA-UHPC leads to a decrease in the first cracking strength for R-CA-UHPC members. Based on the established development functions of elastic modulus, autogenous shrinkage, and tensile creep for CA-UHPC, the restrained effect was quantified according to Dischinger's-differential-equation-based theoretical analysis. Finally, the models to predict the first cracking stresses/strains and the yielding loads of the R-CA-UHPC members were developed and validated.

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