Preprint Article Version 1 This version is not peer-reviewed

Thermal Expansion Model of Cement paste and Concrete Considering Micro-Structural Changes under Elevated Temperature

Version 1 : Received: 8 January 2019 / Approved: 9 January 2019 / Online: 9 January 2019 (12:48:32 CET)

How to cite: Lee, J.; Xi, Y.; Yang, S. Thermal Expansion Model of Cement paste and Concrete Considering Micro-Structural Changes under Elevated Temperature. Preprints 2019, 2019010084 (doi: 10.20944/preprints201901.0084.v1). Lee, J.; Xi, Y.; Yang, S. Thermal Expansion Model of Cement paste and Concrete Considering Micro-Structural Changes under Elevated Temperature. Preprints 2019, 2019010084 (doi: 10.20944/preprints201901.0084.v1).

Abstract

The expansion of concrete subjected to extreme elevated temperature is linked with intricate micro-structural variations, such as the transformation of the constituent phases. This study proposes a model to predict the thermal expansion of cement paste and concrete considering micro-structural changes under elevated temperatures ranging from 20°C to 800°C. The model presented can consider characteristics of various aggregates in the calculation of thermal expansion for concrete. The model is a combination of a multi-scale stoichiometric model and a multi-scale composite model. At the cement paste level, the model satisfactorily predicted a test result. At concrete level, upper bounds from the model were matched relatively well with test results by previous researcher. If the mechanical properties, such as elastic modulus (E), Poisson’s ratio (ν), and thermal deformation, of the aggregates used in concrete are given, it is likely that the model will reasonably predict experimental results.

Subject Areas

Phase change; Composite, Thermal expansion; High temperature; Concrete

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