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High value-added utilization of desulfurized building gypsum as self-leveling mortar: the comprehensive effect of cement

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Environmental science and Pollution Research 2024年第22期31卷 32599-32613页

作者： Zhao, Min Fan, Puyue Zhang, Mingtao Huang, Jing Leng, Pengfei Peng, Jiahui School of Civil and Architectural Engineering Yangtze Normal University Chongqing408100 China School of Materials Science and Engineering Chongqing University Chongqing400045 China School of Civil Engineering and Architecture Chongqing University of Science and Technology Chongqing401331 China

The utilization of desulfurized building gypsum as raw material for gypsum-based self-leveling mortar (GSL) is limited by its low strength and poor water resistance. The objective of this study is to enhance comprehensive properties of GSL and prepare qualified desulfurized building gypsum-based self-leveling mortar that can be effectively applied in practical engineering projects. The influence of cement on water consumption rate of initial fluidity (W/M ratio), fluidity, setting time, mechanical strength, and water resistance of GSL were evaluated. Additionally, rheological parameter, heat of hydration, crystal morphology, and pore structure were also analyzed. Cement significantly improved the fluidity of slurry. Moreover, the compressive strength and softening coefficient of GSL reached 20.6 MPa and 0.56 at 10% cement, respectively. Furthermore, cement reduced the 30-min-fluidity loss and improved fludity by reducing the yield stress and increasing the plastic viscosity of screed. The transformation of hydration kinetics of GSL could be due to Ca2+ and OH− released by cement, thus resulting in the shortening of initial setting time and the prolongation of the interval between initial and final setting time. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) showed that CSH gel and AFt crystal would generate on the surface of CaSO4·2H2O crystal, making the structure more compact. Mercury intrusion porosimetry (MIP) indicated that cement greatly reduced the porosity through the water reduction effect in the early stage and continuous hydration in the later stage. The continuous hydration of cement also increased the shrinkage rate. This work was expected to provide reference for promoting the application of desulfurized building gypsum as the high value-added screed. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Gypsum

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Nano-pore in C-S-H gel stability analysis of hardened cement pastes

Nano-pore in C-S-H gel stability analysis of hardened cement...

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16th Annual Conference and 5th International Conference on Chinese Society of Micro-Nano technology, CSMNT 2014

作者： Wu, Lang Na, Xiong Yu, Fangyan College of Architecture and Civil Engineering Jiangxi Science and Normal University Nanchang330013 China College of Architecture and Civil Engineering Nanchang Institute of Technology Nanchang330044 China

ISBN: (纸本)9783038354628

Based on capillary tension, surface free energy and elasticity theory, a collapse model of nano-pore in C-S-H gel was created in hardened cement pastes. The stability of pore was analyzed by Gibbs free energy theory. The results show that, the capillary is more stable while the capillary is grater and rounder in the case of the aperture changing in the nanometer scope. When the aperture is changing in the scope of micrometer, the collapse possibility of the capillary is tiny. If the capillary size is fixed, the capillary is more stable while the elastic modulus of hydrated products is higher. © (2015) Trans Tech Publications, Switzerland.

关键词： Gibbs free energy

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Heavy metal contamination in fish and human health risks from lakes of a mega inter-basin water diversion

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Chemosphere 2025年 379卷 144407页

作者： Fan, Wenxia Xia, Wentong Lin, Lian-Shin Liu, Han Qu, Xiao Xin, Wei Tang, Lizhou Chen, Yushun College of Life Sciences Jiangxi Normal University Jiangxi Nanchang330022 China State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences Hubei Wuhan430072 China Wadsworth Department of Civil and Environmental Engineering West Virginia University MorgantownWV26506-6103 United States University of Chinese Academy of Sciences Beijing100049 China Huai’ an Research Center & SNWDP-ER Lake Ecosystem Field Station Institute of Hydrobiology Chinese Academy of Sciences Jiangsu Huai’ an223001 China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Hainan Haikou570228 China Changjiang River Scientific Research Institute Hubei Wuhan430019 China Institute of Freshwater and Marine Biology and Conservation School of Life and Health Sciences Hunan University of Science and Technology Hunan Xiangtan411201 China

Heavy metals in freshwater lakes under inter-basin water diversions may pose harms to lake ecosystems and human health but have rarely been studied. We studied fish heavy metals in water diversion lakes, Gao-Bao-Shaobo Lakes (GBSLs), along the South-to-North Water Diversion Project in China, and evaluated associated human health risks from fish consumption. A total of 322 muscle samples from 29 fish species were collected to characterize contamination patterns of copper (Cu), chromium (Cr), cadmium (Cd), lead (Pb), and arsenic (As). The studied heavy metals in fish were found within China's food safety standards. Among the studied metals, Cu, Cd, Pb, and As had higher concentrations temporally in autumn and spatially in Gaoyou Lake. Moreover, Cd, Pb, and As in carnivores were significantly higher than other feeding groups, and Cd and As in upper-middle and upper water layers were significantly higher than other layers. Consumption of GBSLs fish did not pose a non-carcinogenic risk to human health. However, consumption of fish species such as Protosalanx hyalocranius, Carassius auratus, Culter alburnus may pose potential carcinogenic risks to human health due to Cr and Cd. The current study had implications for assessing aquatic ecological conditions and reducing human dietary health risks related to heavy metals in water diversion lakes. © 2025 Elsevier Ltd

关键词： Lake pollution

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Effective oxidation decomplexation of Cu-EDTA and Cu2+ electrodeposition from PCB manufacturing wastewater by persulfate-based electrochemical oxidation: Performance and mechanisms

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Environmental science and Pollution Research 2024年第20期31卷 30072-30084页

作者： Sun, Ming Liu, Xuemei Liu, Zhanmeng School of Civil Engineering and Architecture East China JiaoTong University Nanchang330013 China Jiangxi Provincial Academy of Eco-Environmental Science Research and Planning Nanchang330039 China School of Civil Engineering and Architecture Nanchang Institute of Technology Nanchang330099 China

Complex wastewater matrices such as printed circuit board (PCB) manufacturing wastewater present a major environmental concern. In this work, simultaneous decomplexation of metal complex Cu-EDTA and reduction/electrodeposition of Cu2+ was conducted in a persulfate-based electrochemical oxidation system. Oxidizing/reductive species were simultaneously produced in this system, which realized 99.8% of Cu-EDTA decomplexation, 94.5% of Cu2+ reduction/electrodeposition under the conditions of original solution pH = 3.2, electrode distance = 3 cm, [Na2S2O8]0 = 5 mM, current density = 12 mA/cm2, and reaction time = 180 min. The total treatment cost is as low as 0.80 USD/mol Cu-EDTA. Effective mineralization (74.1% total organic carbon removal) of the solution was obtained after 3 h of treatment. •OH and SO4•– drove the Cu-EDTA decomplexation, destroying the chelating sites and finally it was effectively mineralized to CO2, H2O and Cu2+. The mechanisms of copper electrodeposition on the stainless steel cathode and persulfate activation by the BDD anode were proposed based on the electrochemical measurements. The electrodes exhibited excellent reusability and low metal (total iron and Ni2+) leaching during 20 cycles of application. This study provide an effective and sustainable method for the application of the electro-persulfate process in treating complex wastewater matrices. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Electrodes

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Experimental analysis of the damping characteristics of longmaxi shale under graded cyclic loading with different confining pressures

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Scientific Reports 2025年第1期15卷 1-14页

作者： Jiajun Shu Tao Li Yue Li Fausto Molina-Gómez Rubén Galindo Zhengding Deng Jingzhu Huang Bingni Wu Inner Mongolia Research Institute China University of Mining & Technology-Beijing Ordos 017000 China School of Mechanics and Civil Engineering China University of Mining and Technology-Beijing Beijing 100083 China Higher Technical School of Civil Engineers Universidad Politécnica de Madrid 28039 Madrid Spain School of Civil and Surveying & Mapping Engineering Jiangxi University of Science and Technology Ganzhou 341000 China School of Civil Engineering and Architecture East China Jiaotong University Nanchang 330013 China

In the process of shale gas field development, the surrounding rock has been in a three-way high-pressure stress state for a long period of time and has undergone complex cyclic loading during hydraulic fracturing and high-pressure fracturing fluid return, and its mechanical response and mechanism of action have important impacts on the stability of the reservoir. To reveal the damping characteristics of Longmaxi shale under different peripheral pressures, graded cyclic loading tests were carried out under 0 MPa, 10 MPa and 30 MPa peripheral pressures to systematically analyze the stress‒strain hysteresis characteristics of the shale and the evolution of the damping ratio. The results show that the damping ratio of the Longmaxi shale shows a staged evolution with increasing stress level, which is characterized by “decreasing, stabilizing, and then slightly increasing”. During cyclic loading, the axial and radial damping ratios both decreased and stabilized with increasing number of cycles. The radial damping ratio was always greater than the axial damping ratio under the same circumferential pressure conditions, and the difference was more significant under high circumferential pressure conditions. Shale exhibits typical characteristics of hysteresis and damping response evolution during dynamic loading, reflecting a progressive phase shift wherein strain increasingly lags behind stress. This phenomenon primarily arises from the accumulation of plastic deformation, the continuous propagation of microfractures, and the sequential activation of multistage energy dissipation mechanisms. The damping ratio follows a staged evolution pattern characterized by an initial decline, a period of stability, and a final surge. This trend indicates a transition in the material’s response mechanism—from being dominated by structural compaction to being governed by microscopic damage processes.

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Numerical study of reactive pollutants diffusion in urban street canyons with a viaduct

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Building Simulation 2022年第7期15卷 1227-1241页

作者： Tingzhen Ming Cao Nie Wenyu Li Xin Kang Yongjia Wu Mengjie Zhang Chong Peng School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China School of Architectural Engineering Huonggang Normal UniversityNo.146 Xingang Second RoadHuanggang 438000China Mechanical Engineering Department University of CaliforniaBerkeleyCA 94720USA School of Urban Planning and Architecture Huazhong University of Science and TechnologyWuhan 430074China

In this paper,the influences of the ambient wind speed and the height and width of a viaduct in a 2-dimensional street canyon on the diffusion of reactive pollutants emitted by motor vehicles were investigated using computational fluid dynamics(CFD)*** were treated as reactive by including a NO-NO_(2)-O_(3) photochemical reaction mechanism in the *** Reynolds-averaged Navier-Stokes(RANS)k-ε turbulence model and the discrete phase model were used to simulate the airflow movement and the concentration distribution,respectively,of the reactive pollutants in the street *** indices,i.e.,the chemical reaction contribution of NO(CRC_(NO)),the chemical reaction contribution of NO_(2)(CRC_(NO_(2))),and the O_(3) depletion rate,were used to evaluate the relative importance of the photochemical *** was found that the presence of a viaduct changed the flow field structure in the street *** CRC_(NO) and CRC_(NO_(2))decreased from the windward side to the leeward side of the *** maximum values of the CRC_(NO) and CRC_(NO_(2)) were observed at the pollution source(x=245 m)due to the influence of a clockwise vortex in the street *** the height and width of the viaduct increased,concentration of the ground pollutants and the O_(3) depletion rate *** O_(3) depletion rate was much higher on the leeward side(90%)than on the windward *** pollutant concentrations after the reaction were twice as high with the viaduct as without the viaduct when the viaduct height was the same as the building *** viaduct had a significantly larger influence on the concentration of the reactive pollutants than the chemical *** O_(3) depletion rate in the canyon and the pollutant concentrations decreased as the ambient wind speed increased,whereas the CRC_(NO_(2)) increased.

关键词： street canyon viaduct reactive pollutant-photochemical reaction CFD

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Cooling load characteristics of indoor spaces conditioned by decoupled radiant cooling unit with low radiant temperature

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Building Simulation 2022年第12期15卷 2067-2079页

作者： Yuying Liang Nan Zhang Huijun Wu Xinhua Xu Jianming Yang Gongsheng Huang Department of Architecture and Civil Engineering City University of Hong KongHong KongChina School of Civil Engineering Guangzhou UniversityGuangzhou 510006China Department of Building Environment&Energy Engineering Huazhong University of Science and TechnologyWuhanChina School of Automation Guangdong Polytechnic Normal UniversityGuangzhou 510665China

Decoupled radiant cooling units(DRCUs)are capable of increasing the cooling capacity without increasing condensation risks even using a much lower cooling temperature than conventional radiant cooling units(CRCUs).However,it is unclear whether DRCUs using low radiant cooling temperature will increase the cooling load of the conditioned indoor *** this study,the cooling load characteristics of a thermal chamber conditioned by a DRCU was investigated through developing a steady-state analysis model suitable for both DRCUs and *** total/radiative heat flux,as well as the heat exchange with a thermal manikin and walls were analysed under different surface temperatures of *** effect of the emissivity of the thermal chamber’external wall on the cooling load was also *** indicated that the cooling load under the DRCU was slightly smaller than that under the CRCU when the same operative environment was *** the infrared emissivity of the exterior wall’s inner surface could lead to a significant decrease in the cooling load for both the DRCU and *** decreasing the wall emissivity from 0.9 to 0.1,the total cooling load of the DRCU can be decreased by 8.4%and the heat gain of the exterior wall decreased by 21.6%.This study serves as a reference for developing the analysis model and understanding the load characteristics when DRCUs are used to create the thermal environment for indoor spaces.

关键词： radiant cooling condensation-free computational fluid dynamics cooling load hot and humid climates

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The Feasibility of Immobilization of Bioflocculant-producing Bacteria Using Mycelial Pellets as Biomass Carriers

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Journal of Harbin Institute of technology(New Series) 2013年第3期20卷 1-6页

作者： Jin-Na Wang Fang Ma Jing-Bo Guo Ji-Xian Yang Ang Li Ji-Hua Wang State Key Lab of Urban Water Resource and Environment Harbin Institute of Technology School of Civil and Architecture Engineering Northeast Dianli University School of Life Science and Technology Harbin Normal University

Bioflocculant-producing bacteria Agrobacterium tumefaciens F2 and Bacillus sphaeicus F6 were immobilized onto mycelial pellets to investigate the bioflocculant-producing potential of this combined organism and the corresponding flocculating efficiency. The atomic force microscope ( AFM) images of mycelial surface indicate that the mycelia pellet can immobilize bioflocculant-producing bacteria F2 and F6 as a biomass carrier. The flocculating efficiency of bioflocculant produced by this combined organism was studied under the optimum flocculating conditions obtained by Response Surface Methodology ( RSM ) . The fermentation yield of the combined mycelial pellet is about 2. 6 g / L,which is higher than that of the free bacteria ( only 2. 2 g / L) . Flocculating efficiency of the combined mycelial pellet was comparable with that of bioflocculant generated by the free bacteria. The bioflocculant yield is enhanced and the flocculating efficiency of the co-culture is uninfluenced after immobilized with mycelial pellet as a carrier. In conclusion,the mycelial pellet is feasible as a biomass carrier for the immobilization of bioflocculant-producing bacteria.

关键词： bioflocculant-producing bacteria combined mycelial pellet immobilization biomass carrier

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Influence and characteristic of shading on photovoltaic performance of bifacial modules and method for estimating bifacial gain

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Building Simulation 2023年第10期16卷 1821-1833页

作者： Chenglong Luo Yuandan Wu Xiaoxiao Su Wu Zou Yanshun Yu Qingyang Jiang Lijie Xu School of Energy and Power Engineering Nanjing University of Science and TechnologyNanjing210094China Institute of Energy Research Jiangxi Academy of SciencesNanchang330096China College of Civil Engineering and Architecture Jiaxing UniversityJiaxing314001China School of Marine Engineering Jimei UniversityXiamen361021China

Bifacial PV modules have unique advantages in low-carbon building applications such as BIPV systems but often suffer from the shading problem resulting from higher surrounding objects or building ***-blank quantitative studies of PV performance of bifacial modules operating in actual environments as affected by shading on PV cells are lacking due to the difficulties of analysis caused by the existing multiple variable *** constructing an experimental comparison system on a flat roof of a building,we experimentally tested and analyzed the comparative variation characteristics of PV performance of bifacial and mono-facial modules under different shading area *** results show that from the viewpoint of photoelectric efficiency,the PV performance of both bifacial and mono-facial PV modules clearly varied with the shading fraction of PV cell in some linear rules,though it is difficult to find regularity from the perspective of output power which was also affected by dynamic solar radiation *** abnormal phenomenon emerged that the photoelectric efficiencies of the bifacial modules with small shading fraction were higher compared to the case without *** on the findings of the experimental results,a regression approximation method based on shading test results(RAST Method)is further proposed to analyze and calculate the bifacial gain of bifacial *** the case of the existing roof installation,the mean bifacial gains of the two bifacial modules with different inclination angles were 8.86%and 11.30%,respectively.

关键词： solar energy bifacial module shading numerical fitting bifacial gain

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Uncertainties in landslide susceptibility prediction:Influence rule of different levels of errors in landslide spatial position

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Journal of Rock Mechanics and Geotechnical engineering 2024年第10期16卷 4177-4191页

作者： Faming Huang Ronghui Li Filippo Catani Xiaoting Zhou Ziqiang Zeng Jinsong Huang School of Infrastructure Engineering Nanchang UniversityNanchang330031China Jiangxi Provincial Key Laboratory of Interdisciplinary Science Nanchang UniversityNanchang330031China Department of Geosciences University of PadovaVia Gradenigo 6Padova35131Italy School of Architectural Engineering Jiangxi Science and Technology Normal UniversityNanchang330031China Jiangxi Provincial Science and Technology Affairs Center Nanchang330006China Discipline of Civil Surveying and Conditioning EngineeringPriority Research Centre for Geotechnical Science and EngineeringUniversity of NewcastleNSW2207Australia

The accuracy of landslide susceptibility prediction(LSP)mainly depends on the precision of the landslide spatial ***,the spatial position error of landslide survey is inevitable,resulting in considerable uncertainties in LSP *** overcome this drawback,this study explores the influence of positional errors of landslide spatial position on LSP uncertainties,and then innovatively proposes a semi-supervised machine learning model to reduce the landslide spatial position *** paper collected 16 environmental factors and 337 landslides with accurate spatial positions taking Shangyou County of China as an *** 30e110 m error-based multilayer perceptron(MLP)and random forest(RF)models for LSP are established by randomly offsetting the original landslide by 30,50,70,90 and 110 *** LSP uncertainties are analyzed by the LSP accuracy and distribution ***,a semi-supervised model is proposed to relieve the LSP *** show that:(1)The LSP accuracies of error-based RF/MLP models decrease with the increase of landslide position errors,and are lower than those of original data-based models;(2)70 m error-based models can still reflect the overall distribution characteristics of landslide susceptibility indices,thus original landslides with certain position errors are acceptable for LSP;(3)Semi-supervised machine learning model can efficiently reduce the landslide position errors and thus improve the LSP accuracies.

关键词： Landslide susceptibility prediction Random landslide position errors Uncertainty analysis Multi-layer perceptron Random forest Semi-supervised machine learning

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