Self-consolidating concrete subjected to high temperature

Mechanical and thermal properties of graphene sulfonate nanosheet reinforced sacrificial concrete at elevated temperatures

“…5 shows the residual compressive strength and relative residual compressive strength of sacrificial concrete at elevated temperatures that is defined as the ratio of residual compressive strength at elevated temperature to compressive strength at ambient temperature. As seen in Fig.5a, the compressive strength of sacrificial concrete decreased monotonically with the increase of temperature, which is consistent with the change of compressive strength of self-consolidating concrete [31,44,45] and siliceous sacrificial concrete [36] exposed to elevated temperatures. The compressive strength loss can be attributed to the increase in porosity of sacrificial concrete over the same range of temperature (see Fig.4a) and to the decrease in both stiffness and cohesive strength of C-S-H gel [46].…”

“…In case of fire or nuclear accident, concrete is exposed to elevated temperatures. Although extensive research on the behaviour of concrete subjected to high temperatures has been reported so far [30][31][32][33][34], investigation on the thermal properties of sacrificial concrete is rare, especially on its mechanical properties during elevated temperature exposure. Chu et al [35] have recently carried out a systematic study on mechanical and physicochemical properties of ferro-siliceous sacrificial concrete after high temperature exposure, and observed that the compressive strength-ultrasonic pulse velocity (UPV) and splitting tensile strength-UPV relationships followed a Weibull distribution and was in exponential form, respectively.…”

Thermo-mechanical behavior of baritic concrete exposed to high temperature

“…9a). This phenomenon -often found in ordinary cementitious mortars and concretes, but more likely to occur in high-performance and self-compacting concretes -may be explained as follows [27]: (a) delayed hydration (or rehydration) of the cement paste due to the heat-induced water migration in the pores under the driving force of pore pressure, as demonstrated by the decrease of anhydrous cement in SCC at high temperature; and (b) better bonding properties in the newly-formed hydration products. These two concurrent phenomena have the upper hand of the increasing porosity, that comes from the expulsion of the bound water at high temperature.…”

Heat exposure tests on various types of fibre mortar

“…Many authors (Georgali et al, 2005;Serdar et al, 2008;Fu et al, 2004;Fares et al, 2009) agree on the fact that strength decreases with increasing temperature of exposure. Figure 2 shows the evolution of the compressive strength of mortar samples, with and without fibres, in relation to the exposure temperature.…”