https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 Experimental investigation of chloride uptake performances of hydrocalumite-like Ca-Al LDHs with different microstructures https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45170 2Al-NO3− layered double hydroxides (Ca-Al LDHs) with different microstructures were synthesized. The crystalline properties, structure composition, morphology and particle size distribution of the Ca-Al LDH (CAL) samples were illustrated. To obtain the chloride uptake performances of CAL, the influences of contact time, initial concentration of Cl−, pH of reaction solution and coexistence anions on the chloride uptake were examined systematically. Compared to the CAL samples obtained at a higher aging temperature, CAL synthesized at 60 °C demonstrated the minimum average particle size (6.148 μm) and the best Cl− adsorption capacity (211.324 mg/g). Based on the test results, the main adsorption mechanism of chloride ion on CAL was recognized as an interlayer anion exchanging reaction other than the dissolution-precipitate mode. With the increase in the pH value of reaction solution from 7 to 13, it was found that the amount of chloride ion adsorbed by CAL increased slightly, and the solution could remain at relatively high pH value even after the adsorption. The presence of CO32− and SO42− reduced the adsorption capacity of CAL dramatically as compared with OH− due to the destruction of layered structure and the formation of precipitates (CaCO3 or CaSO4). The interference sequence of the investigated anions on the chloride uptake of CAL was SO42−, CO32− and OH−, and the order of interlayer anionic affinity was Cl− > OH− > NO3−. The results illustrated that the synthesized CAL could be used as a promising chloride ion adsorbent for the corrosion inhibition of reinforcement embedded cement-based materials.]]> Wed 26 Oct 2022 19:20:12 AEDT ]]> Effect of summer ventilation on the thermal performance and energy efficiency of buildings utilizing phase change materials https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:31401 Wed 20 Jan 2021 17:24:09 AEDT ]]> Study of surface modification of recycled aggregate and mechanical properties of the resulting concrete https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:19693 Wed 12 Aug 2015 11:37:17 AEST ]]> Thermophysical and mechanical properties of hardened cement paste with microencapsulated phase change materials for energy storage https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:18818 Wed 11 Apr 2018 10:01:22 AEST ]]> Techno-economic evaluation of energy storage systems for concentrated solar power plants using the Monte Carlo method https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:53735 Wed 10 Jan 2024 11:30:37 AEDT ]]> Properties of self-compacting concrete with recycled concrete aggregates https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:41528 Wed 07 Feb 2024 17:59:39 AEDT ]]> Multi-objective optimization designs of phase change material-enhanced building using the integration of the Stacking model and NSGA-III algorithm https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51245 Wed 07 Feb 2024 14:42:07 AEDT ]]> Development of hollow steel ball macro-encapsulated PCM for thermal energy storage concrete https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24427 Tue 30 Aug 2022 15:15:18 AEST ]]> Study on utilization of carboxyl group decorated carbon nanotubes and carbonation reaction for improving strengths and microstructures of cement paste https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:29620 Tue 28 Jan 2020 16:28:41 AEDT ]]> Fracture properties of polystyrene aggregate concrete after exposure to high temperatures https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27673 SIC), the critical crack tip opening displacement (CTODC) for the Two-Parameter Model, and the fracture energy (GF) 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 ]]> Experimental investigation of the effect of manufactured sand and lightweight sand on the properties of fresh and hardened self-compacting lightweight concretes https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:23844 Tue 28 Jan 2020 16:27:56 AEDT ]]> Effect of nano-CuO on engineering and microstructure properties of fibre-reinforced mortars incorporating metakaolin: experimental and numerical studies https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30457 Tue 28 Jan 2020 16:27:00 AEDT ]]> Effect of graphene oxide (GO) on the morphology and microstructure of cement hydration products https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:31128 Tue 28 Jan 2020 16:23:50 AEDT ]]> Chloride diffusion and acid resistance of concrete containing zeolite and tuff as partial replacements of cement and sand https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:31261 Tue 28 Jan 2020 16:22:32 AEDT ]]> A Review of Seismic Resilience of Shield Tunnels https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50430 Tue 25 Jul 2023 18:54:57 AEST ]]> Mechanical and durability properties of concrete using dredged marine sand https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33016 Tue 21 Aug 2018 11:32:49 AEST ]]> Development of structural-functional integrated energy storage concrete with innovative macro-encapsulated PCM by hollow steel ball https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33352 Tue 20 Feb 2024 13:18:10 AEDT ]]> Study on the interaction mechanism between slags and alkali silicate activators: A hydration kinetics approach https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40851 Tue 19 Jul 2022 11:43:17 AEST ]]> Influence of Mechanical Screened Recycled Coarse Aggregates on Properties of Self-Compacting Concrete https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:52700 Tue 14 Nov 2023 13:02:37 AEDT ]]> Study of performances and microstructures of mortar with calcined low-grade clay https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47007 Tue 13 Dec 2022 11:20:28 AEDT ]]> A critical review on research progress of graphene/cement based composites https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32510 Tue 12 Jun 2018 15:33:14 AEST ]]> Effect of carbon fibers grafted with carbon nanotubes on mechanical properties of cement-based composites https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:44232 Tue 11 Oct 2022 09:54:30 AEDT ]]> Influence and mechanisms of active silica in solid waste on hydration of tricalcium aluminate in the resulting composite cement 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 ]]> Experimental investigation on graphene oxide/SrCl₂·6H₂O modified CaCl₂·6H₂O and the resulting thermal performances https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33140 Tue 03 Sep 2019 17:54:03 AEST ]]> Mechanical and thermo-physical performances of gypsum-based PCM composite materials reinforced with carbon fiber https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39307 Thu 28 Jul 2022 14:56:29 AEST ]]> Hydration characteristics of tricalcium aluminate in the presence of nano-silica https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39233 3A) is the most reactive component of the Portland cement and its hydration has an important impact on the workability and early strength of concrete. Recently, nanomaterials such as nano-silica (nano-SiO2) have attracted much attention in cement-based materials because of its pozzolanic reactivity and the pore-filling effect. However, its influence on the hydration of C3A needs to be well understood. In this study, the hydration kinetics of C3A mixed with different percentages of nano-SiO2 were studied and compared with pure C3A. The hydration products were examined by different characterization techniques including XRD, XPS, and NMR spectroscopy and isothermal calorimetry analyses. The XRD results showed that the addition of nano-SiO2 promoted the conversion of the intermediate product C4AH13. The isothermal calorimetry results showed that the addition of nano-SiO2 significantly reduced the hydration exotherm rate of C3A from 0.34 to less than 0.1 mW/g. With the presence of nano-SiO2, the peaks for Q1 were observed in 29Si MAS-NMR measurements, and the content of Q1 increased from 6.74% to 30.6% when the nano-SiO2 content increased from 2 wt.% to 8 wt.%, whereas the proportion of Q4 gradually decreased from 89.1% to 63.6%. These results indicated a pozzolanic reaction provoked by the nano-SiO2 combined with aluminate structures generating C-A-S-H gel.]]> Thu 28 Jul 2022 09:20:43 AEST ]]> Experimental Study of 3D Concrete Printing Configurations Based on the Buildability Evaluation https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45391 Thu 27 Oct 2022 15:16:22 AEDT ]]> Influence of surface treatment of recycled aggregates on mechanical properties and bond strength of self-compacting concrete https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45082 Thu 27 Oct 2022 14:05:49 AEDT ]]> Prediction of Self-Healing of Engineered Cementitious Composite Using Machine Learning Approaches https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45229 Thu 27 Oct 2022 12:20:18 AEDT ]]> Application of Graphene and Its Derivatives in Cementitious Materials: An Overview https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50505 Thu 27 Jul 2023 13:10:33 AEST ]]> Mechanical properties and mechanisms of alkali-activated slag paste reinforced by graphene oxide-SiO2 composite https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:52649 Thu 19 Oct 2023 15:19:57 AEDT ]]> Discussion and experiments on the limits of chloride, sulphate and shell content in marine fine aggregates for concrete https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42080 Thu 18 Aug 2022 11:12:17 AEST ]]> Study of the effect of seismic performance measures on a metro station structure in liquefiable soil https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:53746 Thu 11 Jan 2024 12:15:16 AEDT ]]> Cementitious composites integrated phase change materials for passive buildings: An overview https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51484 Thu 07 Sep 2023 10:51:54 AEST ]]> An experimental study on the influence of applied voltage on current efficiency of rebars with a modified accelerated corrosion test https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:38815 Thu 06 Jul 2023 15:37:26 AEST ]]> Experimental assessment of position of macro encapsulated phase change material in concrete walls on indoor temperatures and humidity levels https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:20863 Sat 24 Mar 2018 08:02:52 AEDT ]]> Evaluation of the strain-softening law of concrete from the fracture test https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21561 t) and fracture energy (GF) are determined. It is proposed that the same fracture energy test suggested in the RILEM Recommendation be used to evaluate E, ft and GF. Firstly, the fracture energy was as usual evaluated from the area under the load-deflection curve. Secondly, the modulus of elasticity was calculated from the initial compliance in the same curve. Finally, the tensile strength was derived from the peak load. The proposed method was verified using some experimental data available in literature. The calculated values of the modulus of elasticity and the tensile strength were in good agreement with the corresponding experimental data. The method seems to provide a simple and practical way of evaluating the stress-strain and strain-softening curves of ordinary concrete, though further assessment is needed.]]> Sat 24 Mar 2018 07:59:01 AEDT ]]> Properties of concrete containing scrap-tire chips https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21662 Sat 24 Mar 2018 07:52:21 AEDT ]]> Size effect of waste compact disc shred on properties of concrete https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21661 Sat 24 Mar 2018 07:52:21 AEDT ]]> Robust evaluation of self-healing efficiency in cementitious materials - a review https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27679 in-situ applicability.]]> Sat 24 Mar 2018 07:33:51 AEDT ]]> Experimental study on effects of CO₂ concentrations on concrete carbonation and diffusion mechanisms https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25538 Sat 24 Mar 2018 07:26:03 AEDT ]]> Experimental study on thermal response of a PCM energy pile in unsaturated clay https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47036 Mon 29 Jan 2024 18:34:43 AEDT ]]> Enhancing the heat transfer and photothermal conversion of salt hydrate phase change material for efficient solar energy utilization https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47029 Mon 29 Jan 2024 18:32:24 AEDT ]]> Development of high performance PCM cement composites for passive solar buildings https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42484 Mon 29 Jan 2024 17:58:02 AEDT ]]> Development of a stable inorganic phase change material for thermal energy storage in buildings https://nova.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 ]]> Thermo-mechanical performance of a phase change energy pile in saturated sand https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40923 Mon 25 Jul 2022 14:53:13 AEST ]]> Experimental investigation on mechanical properties of clay soil reinforced with carbon fiber https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42387 Mon 22 Aug 2022 15:18:17 AEST ]]> Development of novel composite PCM for thermal energy storage using CaCl₂·6H₂O with graphene oxide and SrCl₂·6H₂O https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32290 Mon 21 May 2018 14:27:59 AEST ]]> Effects of nano silica on the properties of cement-based materials: a comprehensive review https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37932 Mon 05 Jul 2021 13:21:51 AEST ]]> Effect of carbon nanotubes on properties of alkali activated slag - a mechanistic study https://nova.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 ]]> Experimental study of carbon fiber reinforced alkali-activated slag composites with micro-encapsulated PCM for energy storage https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42231 Fri 19 Aug 2022 13:45:46 AEST ]]> Effect of carbon fiber and nanosilica on shear properties of silty soil and the mechanisms https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42136 Fri 19 Aug 2022 08:26:16 AEST ]]> Thermal performance and parameter study of steel fiber-reinforced concrete segment lining in energy subway tunnels https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47305 Fri 13 Jan 2023 10:52:42 AEDT ]]> Thermal performance and corrosion resistance of structural-functional concrete made with inorganic PCM https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37862 Fri 12 Apr 2024 11:03:10 AEST ]]> Methods of accelerating chloride-induced corrosion in steel-reinforced concrete: a comparative review https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39313 Fri 03 Jun 2022 15:07:34 AEST ]]>