The effect of cement dosage on mechanical properties of concrete exposed to high temperatures

A non-destructive technique for health assessment of fire-damaged concrete elements using terrestrial laser scanning

“…For each heated specimen, thermal cycles were followed as depicted in (Fig. 4) for the specimen that was heated to 1000°C because rapid heating rate can also result in higher vapour pressure and cause cracks in concrete [4]. The peak temperatures were maintained for 1 hour and then after an exact period of 1 hour, the furnace was switched off with the specimen inside and left to cool down to room temperature in order to avoid thermal shock.…”

“…Most research work that has been carried out addressing the effects of fire-damaged concrete has been motivated by the extensive use of concrete as a construction material [3] around the world. According to Ergün et al [4] one of most damaging environmental effects for concrete structures is exposure to elevated temperatures and concrete structures such as bridges, viaducts, tunnels, buildings and parking garages are examples of structures at risk of fire damage [5]. Even though concrete is known to be a material with high fire resistance and capable of retaining much of its load-bearing capacity, it undergoes severe modifications in its physical, chemical and mechanical properties when subjected to high temperatures [6].…”

“…It has been reported that when concrete is heated between 200°C and 250°C it begins to undergo loss in its compressive strength. Furthermore, the compressive strength of concrete at temperatures between 300°C and 500°C is reduced to about 15 to 70% of that of unheated concrete [4]. The temperature of 300°C is commonly taken to be the benchmark temperature above which concrete is considered to have been significantly damaged [13].…”

Special Issue: Aging Management of Nuclear Power Plant

“…It is generally acknowledged that high temperature can increase mortar's porosity due to the generation of micro-cracks in the structure Gao et al 2002;Vydra et al 2001). The effect of temperature on strength properties of concrete has been extensively investigated (Bastami et al 2011;Chan et al 2000;Cül-fik and Özturan 2002;Ergün et al 2013;Fall and Samb 2009;Gardner et al 2005;Lin et al 2015), and it was concluded that the reduction in strength of a concrete is disastrous if heated up to 800°C . As reported in many publications (Caré 2008;Castellote et al 2004;Farage et al 2003;Lim and Mondal 2014;Rostásy et al 1980;Zhang et al 2013), the change of micro-structure and pore structures of mortar subjected to high temperatures was studied, revealing that the port-landite in mortar was decomposed abruptly and transformed into lime when it was heated up to 620°C before cooling (Castellote et al 2004).…”

Experimental Study on Hydraulic and Macro-Mechanical Property of a Mortar under Heating and Cooling Treatment

“…The effect of temperature on strength properties of concrete has been extensively investigated (Bastami et al 2011;Chan et al 2000;Cül-fik and Özturan 2002;Ergün et al 2013;Fall and Samb 2009;Gardner et al 2005;Lin et al 2015), and it was concluded that the reduction in strength of a concrete is disastrous if heated up to 800°C . As reported in many publications (Caré 2008;Castellote et al 2004;Farage et al 2003;Lim and Mondal 2014;Rostásy et al 1980;Zhang et al 2013), the change of micro-structure and pore structures of mortar subjected to high temperatures was studied, revealing that the port-landite in mortar was decomposed abruptly and transformed into lime when it was heated up to 620°C before cooling (Castellote et al 2004).…”