https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:31452 Wed 11 Apr 2018 14:54:49 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:15792 Wed 11 Apr 2018 10:31:23 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27673 S_IC), the critical crack tip opening displacement (CTOD_C) for the Two-Parameter Model, and the fracture energy (G_F) for the Fictitious Crack Model were examined using the three-point bending notched beam test, according to the RILEM recommendations. The effects of polystyrene aggregate (PA) content and temperature levels on the fracture and mechanical properties of concrete were investigated. The results showed that the mechanical properties of PAC significantly decreased with increase in temperature level and the extent of which depended on the PA content in the mixture. However, at a very high temperature of 800 °C, all samples showed 80 percent reduction in modulus of elasticity compared to room temperature, regardless of the level of PA content. Fracture properties of control concrete (C) and PAC were influenced by temperature in a similar manner. Increasing temperature from 25 °C to 500 °C caused almost 50% reduction of the fracture energy for all samples while 30% increase in fracture energy was occurred when the temperature increased from 500 °C to 800 °C. It was found that adding more PA content in the mixture lead to a more ductile behaviour of concrete.]]> Tue 28 Jan 2020 16:28:14 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46517 Thu 24 Nov 2022 16:04:25 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:1346 Sat 24 Mar 2018 08:32:40 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:48659 3 (M = Ti – Cu) perovskites using accurate first-principles calculations. The electronic structure across this series of perovskites varies from a semiconductor/insulator to a ferromagnetic and ultimately metallic character, and this leads to a change in the intrinsic stability of the perovskite lattices of more than 700 kJ mol^–1. However, these intrinsic trends are disrupted significantly when explicit thermochemical corrections, relevant to high-temperature applications, are included in reduction free energies. The key factor in this respect is the temperature-dependent entropic contribution, which is distinct for each perovskite. We demonstrate that this is a reflection of the unique instabilities of each perovskite structure at high temperatures.]]> Fri 24 Mar 2023 16:12:09 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37794 Fri 23 Apr 2021 11:04:28 AEST ]]>