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29. Parameter inversion and microscopic damage research on discrete element model of cement-stabilized steel slag based on 3D scanning technology

Author

Chen Guoxin, Lingkai Zhang, and Shuyong Wang

Subjects
Absorption (acoustics), Environmental Engineering, Materials science, Bond strength, Health, Toxicology and Mutagenesis, Pollution, Strain energy, Stress (mechanics), Brittleness, Acoustic emission, Fracture (geology), Environmental Chemistry, Composite material, Waste Management and Disposal, Elastic modulus
Abstract

The macro- and micro-physical properties of cement-stabilized steel slag (CSS) base materials in a highway project were studied. A discrete element model of CSS with a real steel slag shape was constructed using Particle Flow Code 3D and 3D scanning technology. The sensitivity between the macro- and micro-parameters of the sample was explored, and a nonlinear regression equation was established to analyze the relationship between these parameters. Uniaxial compression simulation tests were conducted on CSS with steel slag contents of 0%, 10%, 30%, and 50%. By combining contact calculation, crack location, energy tracking, acoustic emission (AE) monitoring, and other program systems, the macro- and micro-mechanical properties and micro-crack evolution law of the samples in the failure process were analyzed in terms of strength, energy, and fracture damage. The damage mechanism of CSS was also revealed. Results showed that with the increase in steel slag content, the elastic modulus and peak stress of the samples increased, the Poisson’s ratio decreased, and the post-peak stress curve steepened, indicating obvious brittle failure characteristics. With the increase in steel slag content, the crack initiation stress, thickness of the fracture surface, and number of internal micro-cracks in CSS increased exponentially. In the uniaxial compression test, AE intensity underwent five stages, in which the peak moment of AE intensity exhibited hysteresis compared with the moment of the peak stress. Absorption and release phenomena of strain energy were observed in the process of specimen failure. When the steel slag content increased, the total strain energy absorbed by the specimen increased. When the absorbed energy exceeded the bond strength, the bond ruptured with the release of energy. The main crack of the sample penetrated and stretched to the direction of strain energy release to form a macroscopic fracture surface.

Published
2022

38. Unveiling mechanical degradation for a monolithic electrochromic device: Glass/ITO/WO3/LiClO4 (PEO)/TiO2/ITO/glass

Author

Liao Huizhen, Chen Guoxin, Tang Xiufeng, Jiong Zhang, Luo Jianyi, and Li Zhixin

Subjects
Morphology (linguistics), Materials science, Atomic force microscopy, General Chemical Engineering, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochromic devices, 01 natural sciences, 0104 chemical sciences, Ion, Electrochromism, Electrochemistry, Degradation (geology), Composite material, Electrochemical degradation, Cyclic voltammetry, 0210 nano-technology
Abstract

Owing to the accumulation of trapped ions in host structures, electrochromic devices (ECDs) suffer from diminished optical modulation and reduced device efficiency under long-term charge insertions and extractions. The accumulation of trapped ions also results in structural changes and mechanical degradation of the electrochromic film, for which very few studies are currently on hand. Here, we report on an explorative study about the mechanical degradation for a WO3-based monolithic ECD: glass/ITO/WO3/LiClO4(PEO)/TiO2/ITO/glass. For the WO3 EC film, both the electrochemical degradation from cyclic voltammetry and the volume expansion by in-situ AFM monitoring were studied. Under the collective effects of these two aspects, the mechanical degradation process of the ECD was recorded through surface morphology evolutions of the WO3 film during life cycling of the ECD to its final failure for up to 90 000 cycles. The surface morphology of the WO3 film underwent three stages: (I) it first became increasingly denser and denser when the cycles were low, approximately 10 000 times; (II) when the cycles went up to 30 000 times or more, the surface of the WO3 film had an uneven distribution, with some dense islands surrounded by loose areas; and (III) when the cycling continued, this situation got worse, and finally, the WO3 film started to crack. This exploration provides new insights into the degradation mechanism of WO3-based ECDs upon repetitive insertions and extractions of Li ions in practical use.

Published
2020

41. Concentrations and speciation of heavy metals in sludge from nine textile dyeing plants

Author

Meiqing Lin, Jingyong Liu, Xin Liang, Xun-an Ning, Chen Guoxin, and Yujie Wang

Subjects
China, Sewage, Chemistry, Textiles, Health, Toxicology and Mutagenesis, media_common.quotation_subject, Extraction (chemistry), Public Health, Environmental and Occupational Health, Fraction (chemistry), Heavy metals, General Medicine, Fractionation, Chemical Fractionation, Hydrogen-Ion Concentration, Pollution, Bioavailability, Speciation, Metals, Heavy, Soil pH, Environmental chemistry, Composition (visual arts), Coloring Agents, Oxidation-Reduction, Water Pollutants, Chemical, media_common
Abstract

The safe disposal of sludge from textile dyeing industry requires research on bioavailability and concentration of heavy metals. In this study, concentrations and chemical speciation of heavy metals (Cd, Cr, Cu, Ni, Zn, Pb) in sludge from nine different textile dyeing plants were examined. Some physiochemical features of sludge from textile dyeing industry were determined, and a sequential extraction procedure recommended by the Community Bureau of Reference (BCR) was used to study the metal speciation. Cluster analysis (CA) and principal component analysis (PCA) were applied to provide additional information regarding differences in sludge composition. The results showed that Zn and Cu contents were the highest, followed by Ni, Cr, Cd and Pb. The concentration of Cd and Ni in some sludge samples exceeded the standard suggested for acidic soils in China (GB18918-2002). In sludge from textile dyeing plants, Pb, Cd and Cr were principally distributed in the oxidizable and residual fraction, Cu in the oxidizable fraction, Ni in all four fractions and Zn in the acid soluble/exchangeable and reducible fractions. The pH and heat-drying method affected the fractionation of heavy metals in sludge.

Published
2013

43. Erratum to “Porous titania/carbon hybrid microspheres templated by in situ formed polystyrene colloids” [J. Colloid Interface Sci. 469 (2016) 242–256]

Author

Cheng, Ting, primary, Zhang, Guoqiang, additional, Xia, Yonggao, additional, Sun, Zaicheng, additional, Yang, Zhaohui, additional, Liu, Rui, additional, Xia, Senlin, additional, Metwalli, Ezzeldin, additional, Xiao, Ying, additional, Wang, Xiaoyan, additional, Wang, Meimei, additional, Ban, Jianzhen, additional, Yang, Liangtao, additional, Ji, Qing, additional, Qiu, Bao, additional, Chen, Guoxin, additional, Chen, Huifeng, additional, Lin, Yichao, additional, Pei, Xiaoying, additional, Wu, Qiang, additional, Meng, Jian-Qiang, additional, Liu, Zhaoping, additional, Chen, Liang, additional, Xiao, Tonghu, additional, Sun, Ling-Dong, additional, Yan, Chun-Hua, additional, Butt, Hans Jürgen, additional, Müller-Buschbaum, Peter, additional, and Cheng, Ya-Jun, additional

Published
2016
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44. Porous titania/carbon hybrid microspheres templated by in situ formed polystyrene colloids

Author

Cheng, Ting, primary, Zhang, Guoqiang, additional, Xia, Yonggao, additional, Sun, Zaicheng, additional, Yang, Zhaohui, additional, Liu, Rui, additional, Xiao, Ying, additional, Wang, Xiaoyan, additional, Wang, Meimei, additional, Ban, Jianzhen, additional, Yang, Liangtao, additional, Ji, Qing, additional, Qiu, Bao, additional, Chen, Guoxin, additional, Chen, Huifeng, additional, Lin, Yichao, additional, Pei, Xiaoying, additional, Wu, Qiang, additional, Meng, Jian-Qiang, additional, Liu, Zhaoping, additional, Chen, Liang, additional, Xiao, Tonghu, additional, Sun, Ling-Dong, additional, Yan, Chun-Hua, additional, Butt, Hans Jürgen, additional, and Cheng, Ya-Jun, additional

Published
2016
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