Robustness of Ultra-High-Performance Concrete to Changes in Material Temperature
Ultra-high-performance concrete (UHPC) can be vulnerable to variations in materials properties and environmental conditions. In this paper, the sensitivity of UHPC to changes in mixing, casting, curing, and testing temperatures ranging between 10 and 30 ± 2°C (50 and 86 ± 3.5°F) was investigated. The investigated rheological properties, mechanical properties, and shrinkage of UHPC are shown to be significantly affected by temperature changes. UHPC made with either binary or ternary binder containing fly ash (FA) or slag cement exhibited greater robustness than mixtures prepared with 25% silica fume. UHPC made with 60% FA necessitated the lowest high-range water-reducing admixture demand. With temperature increase, the yield stress of UHPC mixtures increased by up to 55%, and plastic viscosity decreased by up to 45%. This resulted in accelerating initial and final setting times by up to 4.5 and 5 hours, respectively. The increase of temperature from 10 to 30 ± 2°C (50 ± to 86 ± 3.5°F) led to a 10 to 75% increase in compressive, splitting tensile, and flexural strengths and modulus of elasticity and 15 to 60% increase in autogenous shrinkage.
M. Valipour and K. Khayat, "Robustness of Ultra-High-Performance Concrete to Changes in Material Temperature," ACI Materials Journal, vol. 117, no. 4, pp. 47-56, American Concrete Institute (ACI), Aug 2020.
The definitive version is available at https://doi.org/10.14359/51724613
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Autogenous shrinkage; Drying shrinkage; Rheological properties; Robustness; Ultra-high-performance concrete
International Standard Serial Number (ISSN)
Article - Journal
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01 Aug 2020