Predicting the Uniaxial Compressive Strength of a Limestone Exposed to High Temperatures by Point Load and Leeb Rebound Hardness Testing

Abstract The effect of exposure to high temperature on rock strength is a topic interest in many engineering fields. In general, known decrease as increases. most common test used evaluate the uniaxial compressive (UCS). It can only be carried out laboratory and presents some limitations terms number, type preparation samples. Such constrains are more evident case rocks from historical monuments affected by fire, where availability samples limited. There alternatives for an indirect determination UCS, such point load (PLT), or non-destructive tests Schmidt’s hammer, that also performed situ. aims this research are: (i) measuring temperatures cooling methods hardness limestone named Pedra de Borriol widely several historic buildings E Spain, (ii) studying possibility indirectly obtaining UCS means PLT Leeb (LHT), using Equotip D. Limestone were heated 105 (standard conditions), 200, 300, 400, 500, 600, 700, 800 900 ºC cooled slowly (in air) quickly (immersed water). After that, LHT changes Results show decreases over 90% between 50 70% index smaller than 60% index. Insignificant differences observed, although provide slightly higher values ones. results indicate estimate providing acceptable prediction. Research correlating parameters after thermally treated still scarce. This novelty provides correlations predict if whose quicker easier.