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Calibration of TSTM test material model for risk assessment of early concrete cracks containing fly ash

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Document pages: 11 pages

Abstract: Reliable cracking risk assessment involves experimental testing and advanced modeling of the behavior of performance, structural constraints and external environmental conditions over time and temperature. In recent decades, mineral additives such as silica fume (SF), blast furnace slag (BFS) and fly ash (FA) have been widely used in the production of high performance concrete. Mineral additives such as fly ash and blast furnace slag will reduce the hydration heat in the hardening stage. Mineral additives also have an important impact on the development of early mechanical properties and viscoelasticity. In the nor-crack project, an extensive test plan was carried out to investigate the material properties related to crackig risk of early-age concrete containing mineral additives. In current paper, the advanced modeling of the heat of hydration, volume changes (autogenous shrinkage and thermal dilation) during hardening, the development of mechanical properties (E-modulus, compressive strength, and tensile strength), and creep relaxation properties are discussed. Tests were performed in “temperature stress testing machine” (TSTM) to measure the restraint stress, and well-documented material models were verified by performing 1-D analysis of restraint stress development in the TSTM (Ji, 2008).

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