https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:31401 Wed 20 Jan 2021 17:24:09 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:53735 Wed 10 Jan 2024 11:30:37 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40851 Tue 19 Jul 2022 11:43:17 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39251 2) which can be used as supplementary cementitious material (SCM) to replace part of Portland cement. Existing studies mainly focus on the impact of solid waste on tricalcium silicate (C₃S) hydration. Since tricalcium aluminate (C₃A) is the most reactive component of the Portland cement, it is of great interest t to investigate the effect of solid waste containing SiO₂ on the hydration process of C₃A. In this study, different amounts of nano-silica (nano-SiO₂) were mixed with C₃A and the hydration products after 72 h of hydration were analyzed by means of X-ray diffraction (XRD), Fourier Transform Infrared analyzer (FT-IR), Environment Scanning Electronic Microscope - Energy Dispersive Spectrometer (ESEM-EDS), X-ray Photoelectron Spectroscopy (XPS) and Solid-state Nuclear Magnetic Resonance (NMR). The results showed that nano-SiO₂ can promote the hydration of C₃A and stabilize the hydration products of C₃A in the form of crystalline hydrogarnet (C₃AH₆). The formation of Si-O-Al bonds was also found in the hydration products. ESEM results revealed that the surface of the crystalline hydration products (C₃AH₆ particles) was covered by gel-like products. The results from the XPS and NMR analyses further confirmed that the negatively charged nano-SiO₂ and the silicate anions can literally interact with C₃A to produce calcium silicoaluminate hydrate (C-A-S-H) gel, whereas the formation of C-A-S-H is attributed to the substitution reaction of Al in the Si-O-Si network occurring on the surface of C₃A. In addition to the reactive silica-aluminum component reacting with Ca(OH)₂ to form additional calcium silicate hydrate (C-S-H) and C-A-S-H gels, the reactive silicon in solid waste can also undergo pozzolanic reaction with C₃A to form C-A-S-H gel.]]> Tue 09 Aug 2022 14:10:52 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51484 Thu 07 Sep 2023 10:51:54 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39152 2·6H₂O) by using a nucleating agent - flake graphite. A super absorbent polymer (SAP) was also used as a thickener to prevent segregation of CaCl₂·6H₂O during phase transition. The combined method of thermogravimetric analysis/differential thermal analysis (TGA-DTA) was firstly proposed to evaluate the segregation of inorganic PCM innovatively. The results showed that using 0.5 wt% flake graphite not only eliminated the supercooling of CaCl₂·6H₂O, but also improved its thermal conductivity for better thermal performance. The results of Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) demonstrated that the flake graphite did play an important role on the crystallization of CaCl₂·6H₂O. Numerical simulation demonstrated that using modified CaCl₂·6H₂O within walls of buildings in Hong Kong and Changsha are economically feasible with the payback periods of 18.3 years and 8.4 years respectively.]]> Mon 29 Jan 2024 17:51:24 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:45428 29Si NMR measurements. The SEM and MIP results demonstrated that CNTs acted as nano-filler in the composite and reduced the porosity of the matrix up to 14.16%. Based on these findings, it can be suggested that CNTs reinforced the AAS composite primarily by means of their physical effects.]]> Fri 28 Oct 2022 11:48:29 AEDT ]]>