Journal•ISSN: 1000-2413
Journal of Wuhan University of Technology-materials Science Edition
Springer Nature
About: Journal of Wuhan University of Technology-materials Science Edition is an academic journal. The journal publishes majorly in the area(s): Microstructure & Cement. Over the lifetime, 3770 publications have been published receiving 18816 citations.
Topics: Microstructure, Cement, Compressive strength, Scanning electron microscope, Ultimate tensile strength
Papers published on a yearly basis
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TL;DR: In this paper, the compressive, bond and bending strength of hardened paste and concrete were measured by X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and the data collected by the authors indicate that with a small amount of nano-SiO2, the Ca(OH)2 crystal at the interface between hardened cement paste and aggregate at early ages may be effectively absorbed in high performance concrete.
Abstract: The pozzolanic activity of nano-SiO2 and silica fume was comparatively studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and the compressive, bond and bending strengths of hardened paste and concrete were also measured. Results indicate that the compressive strength development of the paste made from Ca (OH)2 and nano-SiO2, the reaction rate of Ca (OH)2 with nano-SiO2 and the velocity of C−S−H gel formation from Ca(OH)2 with nano-SiO2 showed marked increases over those of Ca(OH)2 with silica fume. Furthermore, the bond strength at the interface between aggregate and hardened cement paste, and the bending strength of concrete incorporated with 3% NS increased more than those with SF, especially at early ages. To sum up, the pozzolanic activity of nano-SiO2 was much greater than that of silica fume. The results suggest that with a small amount of nano-SiO2, the Ca(OH)2 crystal at the interface between hardened cement paste and aggregate at early ages may be effectively absorbed in high performance concrete.
143 citations
TL;DR: In this paper, the tensile and flexural properties of polyvinyl alcohol (PVA) fiber reinforced ultra high toughness cementitious composite (UHTCC) were investigated, and the composite showed extremely remarkable pseudo strain hardening behavior, saturated multiple cracking and ultra high ultimate strain capacity above 4% under uniaxial loading.
Abstract: The tensile and flexural properties of polyvinyl alcohol (PVA) fiber reinforced ultra high toughness cementitious composite (UHTCC) were investigated. The composite, tested at the age of 14 d, 28 d and 56 d, shows extremely remarkable pseudo strain hardening behavior, saturated multiple cracking and ultra high ultimate strain capacity above 4% under uniaxial loading. Also, the corresponding crack widths are controlled under 50 μm even at 56 days age. In the third point bending tests on thin plate specimens, the composite shows ultra high flexural ductility and multiple cracking on the tension surface. The high ultimate flexural strength/first tensile strength ratio of about 5 verifies the pseudo strain hardening behavior of UHTCC. SEM observation on fracture surfaces provides indirect evidence of optimal design for the composite.
110 citations
TL;DR: In this paper, the authors introduced the process of friction stir welding (FSW), the microstructure in FSW alloys and the factors influencing weld quality, and the complex factors affecting the properties.
Abstract: Friction stir welding (FSW), a new solid-state welding technology invited in the early 1990s, enables us weld aluminum alloys and titanium alloys etc. The processing of FSW, the microstructure in FSW alloys and the factors influencing weld quality are introduced. The complex factors affecting the properties are researched.
108 citations
TL;DR: In this article, the adventitious carbon located at 284.8 eV was used to calibrate samples without the carbon themselves and compared with gold and argon, a more practical and convenient method based on C1s was proposed to get the right positions for binding energy peaks.
Abstract: The adventitious carbon located at 284.8 eV was used to calibrate samples without the carbon themselves. When the carbon is as a major part of the inorganic material, the adventitious carbon should be identified and used as the reference. There is no adventitious carbon on the surfaces of the polymer materials, so using C1s of the carbon in the polymer itself to calibrate the charging effect is reasonable. Furthermore, compared with gold and argon, a more practical and convenient method based on C1s is proposed to get the right positions for binding energy peaks.
95 citations
TL;DR: In this paper, the dynamic characteristics of fiber-modified asphalt mixture were investigated, and the dynamic modulus (E*) and phase angle (δ) for the control asphalt mixture and fiber modified ones at various temperatures and frequencies.
Abstract: The dynamic characteristics of fiber-modified asphalt mixture were investigated. Cellulose fiber, polyester fiber and mineral fiber were used as additives for asphalt mixture, and the dosage was 0.3%, 0.3%, 0.4%, respectively. Dynamic modulus test using SuperPave simple performance tester (SPT) was conducted to study the dynamic modulus (E*) and phase angle (δ) for the control asphalt mixture and fiber-modified ones at various temperatures and frequencies. Experimental results show that all fiber-modified asphalt mixtures have higher dynamic modulus compared with control mixture. The dynamic modulus master curves of each type of asphalt mixtures are determined based on nonlinear least square regression in accordance with the timetemperature superposition theory at a control temperature (21.1°C). The fatigue parameter E*×sinδ and rutting parameter E*/sinδ of asphalt mixture are adopted to study the fatigue and rutting-resistance properties, and experimental results indicate that such properties can be improved by fiber additives.
92 citations