HEAT TREATMENT OF HIGHT PERFORMANCE CONCRETE TO REDUCE ITS SUSCEPTIBILITY TO EXPLOSIVE SPALLING

conference paper

English

High performance concrete (HPC) is nowadays often used as buildings material for constructions with high level of complexity. The compressive strength of HPC is high because of its dense microstructure which has almost no capillary pores. If the HPC concrete is exposed to high temperatures, for example fire, there are no outlets for the entrapped water vapor. The surface layers of the elements are therefore very susceptible to explosive spalling. Due to the spalling reactions the constructions are loosing load bearing concrete cross sections and the reinforcement becomes directly exposed to the flames and softens. Thus, the elements may collapse earlier than with intact cover. This study deals with heat treatment of HPC as to enlarge pores and generate microcracks, which in case of fire may form a porous network for the liberation of the water vapor and avoid high vapor pressure, which could cause explosive spalling. In this study the specimens were heated with low rates up to maximum temperatures of 150, 250, 350 and 450 degrees and after a short hold time period slowly cooled down to ambient temperature.

ECO-Cement, popílek, odpad, Pucolánová aktivita, hydrotermální proces.

NOVÁKOVÁ, I.; DIEDERICHS, U.

2014

11. 6. 2014

VŠB

Ostrava

978-80-248-3381-1

Construmat 2014

1

1

43

49

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