Based on the multi-scale platform of cementitious composite, the release of chemically bound water of Al2O3-Fe2O3-mono (AFm), calcium silicate hydrate (CSH) and calcium hydroxide (CH) is developed by micro-pore structural modelling and rehydration of CH crystals is linked under cyclic fire and wetting. This framework is further improved to handle the spalling of concrete cover against fire hazards. The strength of CSH solid at micro-level and that of concrete composite of mesolevel are numerically presented. The collapse simulation of underground ducts exposed to fire is conducted by the developed multi-scale analysis which is also integrated with soil foundation. It predicts varying mode of failure associated with spalling of cover concrete and the loss of bond.

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volume (), pp. 5 2007 99-112 Multiscale model for creep of shotcrete-from logarithmic-type viscous behavior of CSH at the μm-scale to macroscopic tunnel analysis

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