https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:18818 Wed 11 Apr 2018 10:01:22 AEST ]]> https://nova.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://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37932 Mon 05 Jul 2021 13:21:51 AEST ]]>