作者机构：
[Rongtang Zhang; Jiesheng Liu; Weizhen Cai] School of Civil Engineering and Architecture， Wuhan Polytechnic University;[Jiebing Zhu; Bo Lu; Xiaoke Shen] Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources， Yangtze River Scientific Research Institute;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering， Hohai University;[Cong Li] School of Civil Engineering and Architecture， Wuhan Polytechnic University<&wdkj&>Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources， Yangtze River Scientific Research Institute;[Fangling Xu; Xiaowei Wang] Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources， Yangtze River Scientific Research Institute<&wdkj&>Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering， Hohai University
摘要：
Weathered rock (especially granite) slopes are prone to failure under the action of rainfall， making it necessary to study the response of weathered rock slope to rainfall infiltration for landslide prevention. In this study， a series of model tests of weathered rock slope under different conditions were conducted. The matric suction， volumetric water content， earth pressure and deformation of slope were monitored in real time during rainfall. The response of the slope to rainfall infiltration， failure process and failure mode of slope under different conditions were analyzed， and the early warning criterion for the failure of weathered rock slope caused by rainfall was studied. The results show that the slope deformation evolution process under rainfall condition was closely related to the dissipation of matric suction. When the distribution of the matrix suction (or water content) of slope met the condition that the resistance to sliding of the slip-mass was overcome， the displacement increased sharply and landslide occurred. Three factors including rainfall process， lithologic condition and excavation condition significantly affect the response of weathered rock slope to rainfall. It can be found from the test results under different conditions that compared with intermittent rainfall condition， the rainfall intensity and infiltration depth were smaller when the slope entering accelerated deformation stage under the condition of incremental rainfall. The accumulated rainfall when weathered clastic landslide occurring was greater than that of weathered granite， which results in greater disaster risk. The excavation angle and moisture distribution of a slope were the main factors affecting the stability of a slope. In addition， the evolution processes and critical displacement velocities of slopes were studied by combining the deformation curves and matrix suction curves， which can be used as reference for early warning of rainfall-induced weathered rock landslide.
通讯机构：
[Jing Zhang] S;State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China<&wdkj&>School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
Recovery phosphorus (P) from P-contaminated wastewater is an efficient and environmentally friendly mean to prevent water pollution and alleviate the P shortage crisis. In this study, oyster shell as calcium sources and peanut shells as carbon sources (mass ratio 1:1) were used to prepare a novel Ca-modified biochar (OBC) via co-pyrolysis, and its potential application after P adsorption as a P biofertilizer for soil was also investigated. The results shown that OBC had a remarkable P adsorption capacity from wastewater in a wide range of pH 4-12. The maximum P adsorption capacity of OBC was about 168.2 mg/g with adsorbent dosage 1 g/L, which was about 27.6 times that of the unmodified biochar. The adsorption isotherm and kinetic data were better described by Langmuir isotherm model (R-2 > 0.986) and the pseudo second-order model (R-2 > 0.975), respectively. Characterization analysis of OBC before and after P adsorption by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and specific surface area and porosity analyzer (BET) indicated that the remarkable P adsorption capacity of OBC was mainly ascribed to chemical precipitation, electrostatic adsorption, and hydrogen bonding. Pot experiment results showed that OBC after P adsorption could significantly promote the germination and growth of Spinacia, which manifested that OBC after P adsorption exhibited a good ability to be reused as P fertilizer for soil.
期刊：
ACS Applied Energy Materials,2022年5(7):9109-9117 ISSN：2574-0962
通讯作者：
Fang, Yutang(ppytfang@scut.edu.cn)
作者机构：
[Wang, Shuangfeng; Gao, Xuenong; Zhang, Zhengguo; Liang, Xianghui; Fang, Yutang; Chen, Weicheng] South China Univ Technol, Key Lab Enhanced Heat Transfer & Energy Conservat, Minist Educ, Guangzhou 510640, Guangdong, Peoples R China.;[Fu, Wanwan] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Hubei, Peoples R China.
通讯机构：
[Yutang Fang] K;Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, South China University of Technology, Guangzhou, Guangdong 510640, China
关键词：
In situ growth;phase change composites;photothermal conversion;thermal conductivity enhancement;thermal energy storage
作者机构：
[Dong, Jianhua; Huang, Guomin; Wu, Lifeng; Wu, Shaofei] Nanchang Inst Technol, Sch Hydraul & Ecol Engn, Nanchang 330099, Jiangxi, Peoples R China.;[Wu, Lifeng; Wang, Yicheng] China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cycle River, Beijing 100038, Peoples R China.;[Liu, Fa] Chinese Acad Sci, Inst Geog Sci & Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China.;[Li, Sien] China Agr Univ, Ctr Agr Water Res China, Beijing 100083, Peoples R China.;[Cui, Yaokui] Peking Univ, Sch Earth & Space Sci, Inst RS & GIS, Beijing 100871, Peoples R China.
通讯机构：
[Lifeng Wu] S;State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China<&wdkj&>School of Hydraulic and Ecological Engineering, Nanchang Institute of Technology, Nanchang 330099, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
It has been reported that iron tailing powder (ITP) has the potential to partially replace cement to prepare ultra-high-performance concrete (UHPC). However, the reactivity of ITP particles in concrete largely depends on the curing method. This study investigates the effects of curing conditions on the mechanical and microstructural properties of UHPC containing ITP. To achieve this objective, three research tasks are conducted, including (1) preparing seven concrete formulations by introducing ITP; (2) characterizing their mechanical performance under different curing regimes; and (3) analyzing their microstructure by XRD patterns, FTIR analysis, and SEM observation. The experimental results show that there is an optimum ITP dosage (15%) for their application. The concrete with 15% ITP under standard curing obtains 94.3 MPa at 7 days, their early-age strength could be even further increased by similar to 30% (warm-water curing) and similar to 35% (steamed curing). The steam curing regime stimulates the activity of ITP and refines the microstructure. This study demonstrates the potential of replacing Portland cement with ITP in UHPC production.
摘要：
Cement-emulsified asphalt mixture (CEAM), a kind of cold mix asphalt mixture, has the advantages of energy conservation and emission reduction as well as easy construction. However, the performance of CEAM is not as good as hot mixed asphalt mixtures. Hence, in this study, two different fibers were adopted as the reinforcing phase to improve the comprehensive properties of CEAM. The results indicated that the addition proportion and curing time were crucial to fiber-reinforced cement-emulsified asphalt mixture (FRCEAM). The compressive strengths, water stability, and raveling resistances of FRCEAM preparations with polyester or brucite fibers (FRCEAM-PF and -BF, respectively) were enhanced significantly. FRCEAM-PF had the maximum flexural tensile strength and strain, which meant that its low-temperature performance was the best compared to FRCEAM-PF and CEAM. However, the contribution of PF to CEAM high-temperature stability was greater than that of BF. Fiber addition to CEAM not only enhanced the cycles of fatigue loading but also reduced sensitivity to changes in stress level. Furthermore, FRCEAM-BF durability was slightly better than that of FRCEAM-PF. SEM analysis indicated that fibers provided bridging and meshing effects. Although PF and BF showed different enhancement effects, both mixtures met the requirements for hot mixed asphalt mixtures.
