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Numerical simulation of field test for risk assessment of early concrete cracks containing fly ash

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Document pages: 16 pages

Abstract: Due to the low water binder ratio, high strength and high performance concrete is easy to crack in the early stage. Replacing cement with mineral additives such as fly ash and blast furnace slag can reduce the hydration heat in the hardening stage, but it also has a significant impact on the development of mechanical and viscoelastic properties of early concrete. The potential benefits of reducing the risk of cracking were investigated through field tests conducted by the Norwegian Road Authority. The temperature and strain development of early concrete of "double wall " structure with and without fly ash were tested. Based on the experimental data and well-documented material model, it is verified by the calibration of constraint stress Dvelopment in TSTM test, thermal-structural analysis was performed by finite element program DIANA to assess the cracking risk for concrete structures during hardening. The calculated and measured temperature and strain in the structure had good agreement, and the analysis results showed that mineral additives such as flay ash are beneficial in reducing cracking risk for young concrete. Furthermore, parameter studies were performed to investigate the influence of the two major factors: creep and volume change (autogenous shrinkage and thermal dilation) during hardening, on the stress development in the structure.

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