作者： Liu, Xiaofan;Li, Jixiang;Li, Fengyun;Wang, Junguang;Lu, Haijun

期刊： Advances in Civil Engineering,2021年2021(1):5513303 ISSN：1687-8086

通讯作者： Xiaofan Liu

作者机构： [Li, Fengyun; Wang, Junguang; Lu, Haijun; Liu, Xiaofan; Li, Jixiang] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China.

通讯机构： [Xiaofan Liu] S;School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan 430023, China whpu.edu.cn

摘要： Adding plant fibers such as rice husks or sisals to the mortar is one of the main methods to reuse the agricultural wastes and reduce the energy consumption of building industry. However, recent research showed some limitation of the mortar mixed with plant fibers. In this paper, sisal fibers and rice husks were added together into cement mortar to investigate its mechanical properties and the optimum mixture ratio of sisal fiber and rice husk by mix ratio test and orthogonal test. The microstructure of the sisal fiber was observed using scanning electron microscopy (SEM) to understand how the properties of the mortar were affected. Results showed that adding sisal fiber and rice husk into cement mortar significantly improved the mechanic property, anticrack performance, and impermeability of the mortar. The highest compressive strength and flexural strength can reach 17.1 MPa and 3.3 MPa. The area of early cracks was reduced by 100%, and the maximum seepage pressure was 0.36 MPa. The microstructure analysis also indicated that adding rice husk and sisal fiber have a positive effect on the mortar. These results support that adding 0.1% volume admixture of 16 mm length sisal fiber with 35% rice husk into mortar is helpful for engineering application. © 2021 Xiaofan Liu et al.

语种： 英文

作者： Li, Kaifan;Lu, Haijun*;Zhang, Qian;Li, Jixiang

期刊： KSCE Journal of Civil Engineering,2020年24(6):1706-1716 ISSN：1226-7988

通讯作者： Lu, Haijun

作者机构： [Lu, Haijun; Zhang, Qian; Li, Jixiang; Li, Kaifan] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China.

通讯机构： [Lu, Haijun] W;Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China.

关键词： Sludge activated carbon;Modified clay;Adsorption;Heavy metals;Pore

摘要： Sludge Activated carbon was prepared by heating dewatered municipal sludge to 400°C using ZnCl2 as an activator. The abilities of clay modified with 1%, 3%, and 5% of the sludge activated carbon to adsorb heavy metals were determined. The materials were subjected to scanning electron microscopy and low-temperature nitrogen-adsorption, extraction efficiency, adsorption kinetics, and isothermal adsorption tests to allow the pore sizes, pore volume distributions, pore structures, and adsorption capacities to be assessed. The pores were mostly mesopores and were mostly amorphous (e.g., ink-bottle-shaped holes). With the solid/liquid ratio kept constant, the adsorption capacity at equilibrium increased as the sludge activated carbon content of the clay increased. For clay modified with 1% sludge activated carbon, the adsorption capacity for Cd(II) at equilibrium decreased from 314 to 280 mg/kg as the solid/liquid ratio increased from 80 to 160 g/L. The adsorption capacities for Cu(II) at equilibrium at solid/liquid ratios of 80, 120, and 160 g/L were 442, 409, and 383 mg/kg, respectively, which were 41%, 34%, and 37% higher, respectively, than the Cd(II) adsorption capacities at the same solid/liquid ratios. It was concluded that the sludge activated carbon was suitable for trapping heavy metals such as Cd(II) and Cu(II). © 2020, Korean Society of Civil Engineers.

语种： 英文

作者： Chaofeng Wang;Haijun Lu;Dinggang Li;Jixiang Li

期刊： Nature Environment and Pollution Technology,2020年19(3):1241-1248 ISSN：0972-6268

通讯作者： Lu, H.

作者机构： School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, China;State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

通讯机构： State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, China

关键词： Feldspar;Hydraulic conductivity;Kaolinite;Mechanical permeability;Mica;Microstructure;Mineral exploration;Nuclear magnetic resonance;Organic pollutants;Pollution induced corrosion;Scanning electron microscopy;X ray diffraction;Corrosive environment;Development effect;Infiltration process;Landfill leachates;Macroscopic permeability;Microstructure changes;Mineral composition;X-ray diffraction tests;Leachate treatment;concentration (composition);detection method;experimental study;hydraulic conductivity;kaolinite;landfill;leachate;microstructure;permeability;silty clay;triaxial test

摘要： This paper explores the macroscopic permeability characteristics, pore distribution, mineral composition, and microstructure changes in remoulded silty clay under different concentrations and different back pressures through flexible-wall triaxial permeability tests, nuclear magnetic resonance tests, X-ray diffraction tests, and scanning electron microscope tests. The results of the flexible-wall triaxial permeability tests indicate that the hydraulic conductivity of the landfill leachate with different concentrations increases to the peak value in 108-132 h period and then decreases to a stable value in 252-264 h period under the action of different back pressures. The nuclear magnetic resonance tests show that the pore distribution of the remoulded silty clay is macropore after it is corroded by the leachate. Increasing the concentration of landfill leachate and reducing the back pressures can reduce the overall development effect of pores. The X-ray diffraction tests show that the weakly acidic corrosive environment provided by remoulded silty clay and landfill leachate reduce respectively the contents of montmorillonite, muscovite, and illite by 33.52 %, 23.57 % and 63.51 %, while kaolinite and albite increase by 283.40 % and 188.64 %. Finally, scanning electron microscope tests show that the corrosion of landfill leachate and the plugging of organic pollutants in the infiltration process reduce the apparent pore ratio of the microstructure of remoulded silty clay and the hydraulic conductivity gradually decreases. © 2020 Technoscience Publications. All rights reserved.

语种： 英文

作者： Lu, Haijun*;Wang, Chaofeng;Li, Dinggang;Li, Jixiang;Wan, Yong*

期刊： WATER AIR AND SOIL POLLUTION,2020年231(5):1-11 ISSN：0049-6979

通讯作者： Lu, Haijun;Wan, Yong

作者机构： [Lu, Haijun; Li, Dinggang; Wang, Chaofeng; Li, Jixiang] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China.;[Wan, Yong] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China.

通讯机构： [Lu, Haijun] W;[Wan, Yong] C;Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China.;Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China.

关键词： Undisturbed silty clay;Landfill leachate;Permeability;Pore;Particle size;Structural parameter

摘要： This study focused on the permeability and structural evolution of impeded soil layers in landfill. A series of laboratory tests including a permeability test, X-ray diffraction, nuclear magnetic resonance, scanning electron microscopy, and laser particle size tests were conducted to analyze the permeability and microstructure characteristics of undisturbed silty clay polluted by landfill leachate. The hydraulic conductivities increased with time in the first 108h. After 108h, the hydraulic conductivities of undisturbed silty clay polluted by landfill leachate decreased. After 205h, the changes in the hydraulic conductivity stabilized, and the hydraulic conductivity decreased with the increase of the concentration of leachate. The volume fractions of inter-particle and intra-aggregate pores were much higher than those of other pores. The optimal radius decreased as the concentration of leachate increased. The blockage of the pore channel and weakened permeability was caused by solid matter interception by the porous medium. As the height of the specimen increased, the volume fraction of coarse grain changed rapidly and sharply, and the volume fraction of fine grain changed slowly. The average particle size increased with increased specimen height and decreased as the leachate concentration increased. A comprehensive structural parameter (ζ) of undisturbed silty clay polluted by landfill leachate was obtained based on the test results. The equation of comprehensive structural parameter ζ of undisturbed silty clay polluted by leachate was established. These results can provide fundamental data for evaluating the stability of the underlying stratum of landfill sites. © 2020, Springer Nature Switzerland AG.

语种： 英文

作者： Xu, Shicheng;Lu, Haijun*;Liu, Junzhu;Li, Jixiang

期刊： Bulletin of Engineering Geology and the Environment,2019年78(6):4611-4622 ISSN：1435-9529

通讯作者： Lu, Haijun

作者机构： [Lu, Haijun; Xu, Shicheng; Li, Jixiang] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Hubei, Peoples R China.;[Lu, Haijun] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China.;[Liu, Junzhu] Beijing Geo & Inv Engn Inst, Beijing 100083, Peoples R China.

通讯机构： [Lu, Haijun] W;[Lu, Haijun] C;Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Hubei, Peoples R China.;Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China.

关键词： Structured clay;Landfill leachate;Triaxial shear test;Microstructure;Particle distribution

摘要： City solid waste stock has exceeded 8 billion tons in China, and the output and coverage area of solid waste are increasing daily. Landfill leachate can be generated during biodegradation of disposed and stored solid waste. Leachate contains high concentrations of organic mixtures and heavy metal ions. Natural undisturbed soil has high anti-seepage capacity and its permeability coefficient is less than 1 x 10(-7) cm/s in underlying stratum, which can delay leachate contamination of the environment surrounding a landfill site. However, undisturbed soil exhibits certain structural characteristics. After long-term leachate corrosion, leachate leakage will inevitably influence the stability of stratum underlying a landfill. In this study, the mechanical characteristics of undisturbed clay under the actions of landfill leachate and stress were analyzed via a consolidated-undrained triaxial shear test. Comprehensive microstructure laboratory tests, including X-ray diffraction, scanning electron microscopy, and laser particle size tests, were performed to determine at different times the microstructure of undisturbed clay due to corrosion by landfill leachate. Experimental results indicate the strength and microstructural evolution of structured clay under the actions of landfill leachate and stress. The research results are helpful for evaluating the safety and predicting the stability of a landfill's underlying stratum.

语种： 英文

作者： Xu, Shicheng;Lu, Haijun;Li, Dinggang;Li, Jixiang;Wang, Weiwei

期刊： Environmental Science and Engineering,2019年:145-153 ISSN：1863-5520

通讯作者： Lu, HJ

作者机构： [Lu, Haijun; Li, Dinggang; Xu, Shicheng; Wang, Weiwei; Li, Jixiang] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China.

通讯机构： [Lu, HJ ] W;Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China.

会议名称： 8th International Congress on Environmental Geotechnics, ICEG 2018

会议时间： 28 October 2018 through 1 November 2018

会议地点： Hangzhou, PEOPLES R CHINA

会议主办单位： [Xu, Shicheng;Lu, Haijun;Li, Dinggang;Li, Jixiang;Wang, Weiwei] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China.

会议论文集名称： Environmental Science and Engineering

关键词： Compressibility;Landfill leachate;Pore;Undisturbed loess

摘要： This paper aims to investigate the compression and pore characteristics of underlying stratum in landfill. Batch tests were conducted to measure the compressibility as well as the pore, mineral, and microstructure characteristics of the undisturbed loess polluted by landfill leachate under different concentrations. Results show that the compressibility and compressive deformation of undisturbed soil increased as the landfill leachate concentrations increased. The reduction range of the void ratio was from 22.1% to 30.8%. The leachate pollution caused a decrease in the content of illite and montmorillonite, which reduced by 4.59% and 3.8%, respectively. The NMR signal of undisturbed soil increased as the landfill leachate concentrations increased. The pore radius of the undisturbed soil was mainly distributed in the range of 0.01–1 μm and can be divided into two ranges. The inter-particle pores and intra-aggregate pores mainly existed in undisturbed soil polluted by landfill leachate. Leachate caused an increase in inter-particle pore, whereas a decrease in intra-aggregate pore radius. © Springer Nature Singapore Pte Ltd. 2019.

语种： 英文

作者： Lu, Haijun;Xu, Shicheng*;Li, Dinggang;Li, Jixiang

期刊： KSCE Journal of Civil Engineering,2018年22(12):4891-4900 ISSN：1226-7988

通讯作者： Xu, Shicheng

作者机构： [Lu, Haijun; Li, Dinggang; Xu, Shicheng; Li, Jixiang] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Hubei, Peoples R China.

通讯机构： [Xu, Shicheng] W;Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Hubei, Peoples R China.

关键词： Honeycomb structures;Leachate treatment;Microstructure;Minerals;Particle size;Particle size analysis;Sediments;Soils;Stress-strain curves;Average particle size;Landfill leachates;Leachate concentrations;Mineral composition;Pore characteristics;Pore-water pressures;strength;Undisturbed loess;Soil pollution

摘要： To investigate the shear strength and microstructure of undisturbed loess polluted by landfill leachate, a series of laboratory tests were carried out to determine the shear strength, mineral composition, surface morphology, particle size distribution and pore characteristics of the loess. The stress-strain curve of undisturbed soil polluted by landfill leachate showed typical strain-softening behavior. The deviatoric stress, cohesion and angle of shearing resistance of undisturbed soil decreased at increased landfill leachate concentrations, decreased by 31.03%, 30.01%, respectively. But pore water pressure was positively related to leachate concentrations. The content of primary minerals remained stable, and the content of montmorillonite and illite decreased with increased leachate concentration, reduced by 26.02%, 23.93%, respectively. Soil structure changed into an unstable honeycomb structure when the leachate concentration increased. Moreover, the average particle size decreased by 62.1%, and the specific surface area increased and then stabilized at 500 ~ 650 m2/kg. The soil particles became nonuniform and porous and their sizes gradually decreased. The pore radius of soil mainly ranged from 0.02 μm to 1 μm. The maximum radius and optimal radius of the pore increased when the leachate concentrations increased. © 2018, Korean Society of Civil Engineers.

语种： 英文

作者： 黄坤;刘肖凡;陆海军;李继祥

期刊： 新型建筑材料,2018年45(8):155-159 ISSN：1001-702X

作者机构： 武汉轻工大学 土木工程与建筑学院,湖北 武汉,430023;[李继祥; 黄坤; 陆海军; 刘肖凡] 武汉轻工大学

关键词： 水溶性聚氨酯;胶凝时间;遇水膨胀率;粘结强度;拉伸剪切强度

摘要： 为提高水溶性聚氨酯注浆材料(WPU)的性能,在其中加入羟丙基甲基纤维素(HPMC),研究温度、HPMC用量对WPU胶凝时间和遇水膨胀率的影响及HPMC用量对浆液力学性能的影响.结果表明:温度升高能促进WPU凝结成胶;20～60℃时HPMC的加入能延缓WPU凝结成胶;60～80℃时HPMC因达到胶凝温度而丧失缓凝效果,使得浆液胶凝时间缩短.温度的升高和HPMC的加入均能使浆液的遇水膨胀率增大,且温度对遇水膨胀率的影响效果强于HPMC的作用;HPMC的加入能够改善WPU的力学性能.

语种： 中文

作者： Liu, Huikai;Lu, Haijun*;Zhang, Xiong;Li, Jixiang;Wang, Weiwei

期刊： JOURNAL OF TESTING AND EVALUATION,2018年46(2):493-506 ISSN：0090-3973

通讯作者： Lu, Haijun

作者机构： [Lu, Haijun; Liu, Huikai; Wang, Weiwei; Li, Jixiang; Zhang, Xiong] Wuhan Polytech Univ, Inst Poromech, 68 South Rd, Wuhan 430023, Hubei, Peoples R China.

通讯机构： [Lu, Haijun] W;Wuhan Polytech Univ, Inst Poromech, 68 South Rd, Wuhan 430023, Hubei, Peoples R China.

关键词： Cadmium;Contamination;Costs;Cracks;Drying;Gas adsorption;Gas permeability;Health hazards;Health risks;Hydraulic conductivity;Leaching;Soil cement;Soils;Temperature;Wetting;Cd-contaminated soils;Commercial availability;Drying-wetting cycle;Heavy metal contaminated soils;Leaching concentrations;Low-temperature nitrogen;pore;Solidification/stabilization;Soil pollution

摘要： Many human activities can produce and release cadmium (Cd) to air, water, and soils. Soils are the major sink for Cd released into the environment. Unlike organic contaminants, which are oxidized to carbon (IV) oxide by microbial action, Cd does not undergo microbial or chemical degradation, and its total concentration in soils persists for a long time after introduction. The excessive presence of Cd in soil poses great risks and hazards to human health and is detrimental to the ecosystem. In the past 50 years, cement-based solidification/stabilization (S/S) of heavy metal-contaminated soil has received increasing research attention, and its application has expanded because of its advantages over many other existing methods such as relatively low cost, good long-term effectiveness and performance, ready commercial availability, general acceptance by the public, etc. However, considering the lasting effect and environmental impact of the S/S method, as well as the complicated surroundings of cement-solidified Cd-contaminated soils, further research is needed. In this study, a comprehensive series of tests such as low-temperature nitrogen gas adsorption/desorption, permeability, and Cd leaching were performed to investigate the performance of Cd-contaminated soils solidified with 2 %, 5 %, 8 %, and 10 % of cement during a various number of drying-wetting (D-W) cycles. The focus was put on the cracking occurrences and evolution with the number of D-W cycles, their influences on the pore/crack size and distribution, hydraulic conductivity, and final concentration of Cd leaching. Based upon the analyses of the test results, some conclusions are drawn and the optimum percentage of cement treatment was suggested for the soils under investigation. © 2018 by ASTM International.

语种： 英文

作者： 徐仕程;陆海军;王庚午;李继祥;汪为巍

期刊： 科学技术与工程,2018年18(9):163-169 ISSN：1671-1815

作者机构： 武汉轻工大学土木工程与建筑学院,武汉,430023;[汪为巍; 李继祥; 王庚午; 陆海军; 徐仕程] 武汉轻工大学

关键词： 污泥固化;垃圾渗滤液;剪切强度;孔隙参数;水力传导系数

摘要： 为了克服传统污泥固化方法中固化成本高、强度低、渗透系数高等缺点,采用骨架构建法,对煤矸石、污泥进行固化处理。通过三轴试验、低温氮气吸附-脱附试验、渗透试验检测污泥固化体的宏观力学强度特性、孔隙参数、水力传导系数。通过实验可得:经过渗滤液作用后,2、3号试样的偏应力较大,9号试样的偏应力最小。当水泥、煤矸石掺入量达到最佳混合掺入量时,试样的黏聚力较高。9号试样的滞后环分离程度较大;且各试样的孔径曲线在2~4 nm处出现叠峰。各试样的水力传导系数始终小于1×10-7 cm/s。根据试验结果,从微观和宏观两个方面分析了黏土对于污泥固化体强度特性、渗透特性的影响。

语种： 中文

作者： Xu, Shicheng;Lu, Haijun*;Li, Jixiang;Liu, Xiaofan;Wang, Weiwei

期刊： PROCEEDINGS OF GEOSHANGHAI 2018 INTERNATIONAL CONFERENCE: GEOENVIRONMENT AND GEOHAZARD,2018年: 289-297

通讯作者： Lu, Haijun

作者机构： [Lu, Haijun; Liu, Xiaofan; Xu, Shicheng; Wang, Weiwei; Li, Jixiang] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Hubei, Peoples R China.

通讯机构： [Lu, Haijun] W;Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Hubei, Peoples R China.

会议名称： 4th GeoShanghai International Conference on Geoenvironment and Geohazard

会议时间： MAY 27-30, 2018

会议地点： Tongji Univ, Shanghai, PEOPLES R CHINA

会议主办单位： Tongji Univ

会议论文集名称： Proceedings of GeoShanghai 2018 International Conference: Geoenvironment and Geohazard

关键词： Compacted clay;Landfill leachate;Triaxial shear test;Microstructure

摘要： In order to reasonably predict failure law of compacted clay presented in landfill leachate as well as help provide theoretical basis for curbing and restoration of contaminated soil, triaxial shear, SEM, XRD and laser particle size tests were used to determine strength and microstructure of compacted clay presented in landfill leachate in this paper. The results show that when the leachate concentration was low, the stress-strain curve of compacted clay belonged to typical strain-softening behavior. With the increase of leachate concentration, the stress-strain curve of soil began to show typical strain-hardening behavior. The concentration of leachate was negatively related to the cohesion and internal friction angle of soil sample. In the aspect of soil microstructure, with the increase of leachate concentration, a series of microstructural changes, such as a decrease of secondary minerals, an increase of pore, the overhead pores developed into cracks and so on, had result in a decrease of the strength of compacted clay. The particle size curve of compacted clay presented in landfill leachate was about single peak curve and the value of D-v(50) tend to stable.

语种： 英文

作者： 张芊;陆海军;李继祥;汪为巍;陈威

期刊： 科学技术与工程,2017年17(8):87-93 ISSN：1671-1815

作者机构： 武汉轻工大学多孔介质力学研究所,武汉,430023;[汪为巍; 张芊; 陈威; 李继祥; 陆海军] 武汉轻工大学

关键词： 污泥;开裂因子;微观结构;渗透系数;剪切强度

摘要： 为了研究水泥、煤矸石、黏土、纤维对污泥进行改性固化的规律,评价其作为填埋场衬垫防渗材料的可行性,通过干缩开裂实验,观察固化污泥的失水、体积收缩、开裂情况。采用低温氮气吸附试验,检测固化污泥试样的孔隙结构与比表面积。采用环境岩土柔性壁渗透试验,检测固化污泥的渗透系数。采用三轴剪切试验仪,检测固化污泥的抗剪强度。通过试验发现：污泥固化体的含水率变化范围为22.08%-150.48%;且随着含水率的降低,开裂因子逐渐增大。随着污泥固化体的体积收缩率增大,开裂因子总体呈增大趋势。污泥固化体的孔径曲线呈＂M＂型,双肩峰集中出现在3-5 nm和7-8.5 nm区间段。随着时间的增加,污泥固化体的渗透系数呈下降趋势,且存在较明显的波动,试验结束时分布在4.49×10^-8-5.32×10^-8cm/s。污泥固化体的污泥与水泥、煤矸石等固化材料的掺入量较为适宜时,生成的水化产物多,黏聚力较大,内摩擦角相应较小,抗剪能力较强。

语种： 中文

作者： 刘辉凯;陆海军;刘肖凡;张雄;李继祥

作者机构： [刘辉凯; 陆海军; 刘肖凡; 张雄; 李继祥] 武汉轻工大学多孔介质力学研究所

会议时间： 2017-08-30

关键词： 污泥灰;黏土;开裂;渗透性;防渗材料

摘要： 针对市政污水处理厂污泥处置问题和垃圾填埋场衬垫系统破损失效现状,在连续干燥和干湿循环条件下,通过开裂试验和渗透试验,进一步论证了污泥灰改性黏土作为填埋场衬垫系统防渗材料的可行性。加入污泥灰后,降低了土样的密实度,削弱了黏土的整体黏聚力。在连续干燥失水条件下,纯黏土和污泥灰含量为1%、3%的试样无裂隙出现,而污泥灰含量为5%和10%的试样则出现了显著开裂,其最终开裂因子分别为0.01461和0.11

语种： 中文

作者： 刘肖凡;林武星;李继祥

期刊： 混凝土,2017年(1):133-136 ISSN：1002-3550

作者机构： 武汉轻工大学土木工程与建筑学院,湖北武汉,430023;[李继祥; 林武星; 刘肖凡] 武汉轻工大学

关键词： 刚性聚丙烯纤维;透水混凝土;抗冻融;干湿循环

摘要： 为研究刚性聚丙烯纤维的掺入对透水混凝土材料耐久性能的影响,试验室中对4种掺量的钢纤维改性透水混凝土分别进行了冻融循环试验和硫酸盐干湿循环试验。研究表明随着纤维掺量的增加,透水混凝土的抗冻融性能和抗硫酸盐干湿循环性能均有提升,1%体积掺量的刚性聚丙烯纤维改性透水混凝土具备较好的耐久性能。对透水混凝土的冻融指标评定应以质量损失率为主,纤维一定程度上承担了基体冻融过程中的体积膨胀应力和硫酸盐循环中的结晶压力,对透水混凝土有效的发挥了阻裂和增强作用。

语种： 中文

作者： 刘肖凡;林武星;李继祥

期刊： 土木工程与管理学报,2017年34(2):33-36,40 ISSN：2095-0985

作者机构： 武汉轻工大学 土木工程与建筑学院,湖北 武汉,430023;[李继祥; 林武星; 刘肖凡] 武汉轻工大学

关键词： 刚性聚丙烯纤维;透水混凝土;模型试验;路用性能

摘要： 为研究刚性聚丙烯纤维改性透水混凝土材料作为道路面层的路用性能以及对土基层稳定性的影响,实验室中制作了4组透水混凝土路段模型,实测刚性聚丙烯纤维改性透水混凝土面层的渗透系数为3.13 cm/s,较普通透水混凝土路面具备更优的渗透性能;模拟刚性聚丙烯纤维改性透水混凝土路面在干燥状态及降雨水饱和状态下的承载试验,得到模型路段的标准轴载承载力分别为98和86 k N,较普通透水混凝土路面承载力分别提高了49%和62%。在同种状态的土基上加载,纤维模型路段较普通模型路段有更强的抗弯沉变形能力,相同荷载下刚性聚丙烯纤维路段各点沉降量减小且较均匀,表现出更佳的整体工作性能。

语种： 中文

作者： Yang, Jiankang;Lu, Haijun;Zhang, Xiong;Li, Jixiang;Wang, Weiwei

期刊： Advances in Materials Science and Engineering,2017年2017:1-13 ISSN：1687-8434

通讯作者： Lu, HJ

作者机构： [Yang, Jiankang; Lu, Haijun; Li, Jixiang; Wang, Weiwei] Wuhan Polytech Univ, Inst Poromech, Wuhan 430023, Peoples R China.;[Zhang, Xiong] Missouri Univ Sci & Technol, Dept Civil Architectural & Environm Engn, Rolla, MO USA.

通讯机构： [Lu, HJ ] ;Wuhan Polytech Univ, Inst Poromech, Wuhan 430023, Peoples R China.

摘要： The municipal sewage sludge typically has very high water content and low shear strength. Conventional methods of lime and cement solidification of municipal sewage sludge often suffer high cost, significant drying shrinkage, frequent cracking, high hydraulic conductivity, and low strength. To overcome these shortcomings, in this paper a skeleton-building method was used to solidify municipal sewage sludge in which coal gangue, cement and clay, and fiber were used as skeleton materials, cementation materials, and filling materials, respectively. Comprehensive laboratory tests including cracking, nitrogen adsorption, triaxial shearing, and permeability tests were performed to determine cracking, pore structure, shear strength, and hydraulic conductivity of municipal sewage sludge solidified with different proportions of coal gangue, cement, fiber, and clay. Based upon the experimental results, the mechanisms of the skeleton building using cement and coal gangue were discussed and factors controlling the mechanical and hydraulic behavior of the solidified soils were analyzed at both microscopic and macroscopic levels. Based upon the test results and analyses, recommendations were made for solidifying municipal sewage sludge through skeleton building using cement and coal gangue. The solidified soils have high soil strength, high resistance to cracking, and low hydraulic conductivity which are sufficient for being used as landfill liner.<br/> &copy;2017 Jiankang Yang et al.

语种： 英文

作者： 杨建康;陆海军;李继祥;朱登峰

期刊： 大连理工大学学报,2016年56(3):252-256 ISSN：1000-8608

通讯作者： Lu, H.-J.

作者机构： [朱登峰; 李继祥; 杨建康] Institute of Poromechanics, Wuhan Polytechnic University, Wuhan, 430023, China;Institute of Geotechnical Engineering, School of Civil Engineering, Dalian University of Technology, Dalian, 116024, China;[陆海军] Institute of Poromechanics, Wuhan Polytechnic University, Wuhan, 430023, China, Institute of Geotechnical Engineering, School of Civil Engineering, Dalian University of Technology, Dalian, 116024, China

通讯机构： [Lu, H.-J.] I;Institute of Poromechanics, China

关键词： 注浆;黏度系数;孔隙结构;膨胀系数

摘要： 水泥‐水玻璃双液注浆材料由于其凝胶时间短、早期强度高、材料经济且来源广泛等诸多优点，而被大量用于工程注浆堵水中．通过黏度试验、凝胶时间试验、线膨胀试验与低温氮气吸附试验，深化了对双液注浆材料基本性能的认识，同时结合试验结果提出最优双液注浆材料配合比．凝胶时间试验表明，在水泥掺量增加、温度升高的过程中，浆液的凝胶时间从148～367 s减少到71～211 s；黏度试验表明，由20℃升温到50℃时，黏度从10．39～178．57 m2／s非线性降低到6．84～83．58 m2／s ，浆液表现出明显的非牛顿流体的特性；浆液结石体低温氮气吸附条件下，浆液孔径分布在2～10 nm ，浆液孔隙分布均匀，不易发生渗漏现象；凝固后的浆液结石体线膨胀系数在30℃到60℃有下降趋势，但浆液仍表现为热膨胀性，而在大于70℃时线膨胀系数变为负值，浆液结石体出现收缩性质．

语种： 中文

作者： 耿进明;李泽鸿;史学增;黄伟;鲍文杰

期刊： 大连理工大学学报,2016年56(5):510-517 ISSN：1000-8608

通讯作者： Lu, H.-J.

作者机构： [耿进明; 李泽鸿; 史学增; 黄伟; 鲍文杰] 吉林农业大学动物科学系

通讯机构： Institute of Poromechanics, Wuhan Polytechnic University, Wuhan, China

关键词： 水泥;高岭土;渗沥液;渗透;变形

摘要： 针对填埋场衬垫在高荷载作用下开裂破坏的现状,采用水泥固化高岭土,评价其抗渗、抗开裂及固结压缩特性,探究其作为填埋场衬垫材料的可行性.采用纯高岭土与水泥掺量5%、10%、15%的固化高岭土进行试验,室内模拟填埋场衬垫受渗沥液污染的工况,通过渗透试验测定水力传导系数,分析其抵抗污染物渗透能力;通过固结试验测定压缩系数,分析其固结压缩特性;通过干湿循环开裂试验测定开裂因子,分析其抵抗开裂变形特性.结果表明:试样水力传导系数随时间增加而下降,其中纯高岭土下降40.4%,而水泥固化后高岭土仅下降16.0%~27.1%.由于试验高岭土属于中压缩性土,试样孔隙比随荷载压力上升而下降,水泥掺量越多,孔隙比下降越少,200 kPa荷载下,0.25~64 min的轴向位移变化量占总变化量的65.1%~70.7%;掺入水泥后试样的开裂面积明显减小,最大开裂因子降幅达52.6%,水泥掺量10%与15%的试样开裂因子差别较小.水泥固化后高岭土的强度及抗开裂能力提高,满足作为填埋场衬垫材料的要求.

语种： 中文

作者： 刘肖凡;梅国栋;李继祥

期刊： 混凝土与水泥制品,2016年(2):51-54 ISSN：1000-4637

作者机构： 武汉轻工大学土木工程与建筑学院,430023;碧桂园控股集团有限公司,佛山,528312;[李继祥; 刘肖凡] 武汉轻工大学;[梅国栋] 碧桂园集团

关键词： 钢纤维;聚丙烯纤维;混杂纤维;抗裂性能;水泥基复合材料

摘要： 按照钢纤维0、0.5%、1.0%的体积掺量和聚丙烯纤维0、0.05%、0.1%的体积掺量进行了砂浆平板收缩抗裂试验。研究表明,当体积掺量为钢纤维0.5%、聚丙烯纤维0.05%,限裂效能为三级;当体积掺量为钢纤维1.0%、聚丙烯纤维0.1%,限裂效能最优达到一级。综合分析表明,钢-聚丙烯混杂纤维在水泥基复合材料中能产生协同阻裂效应,在基体干燥收缩过程中有显著的综合阻裂效果。

语种： 中文

作者： Liu, Jiesheng*;Liu, Ke;Zhang, Juan;Li, Jixiang

期刊： JOURNAL OF TESTING AND EVALUATION,2016年44(1):175-182 ISSN：0090-3973

通讯作者： Liu, Jiesheng

作者机构： [Zhang, Juan; Liu, Jiesheng; Li, Jixiang; Liu, Ke] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China.

通讯机构： [Liu, Jiesheng] W;Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China.

关键词： Carbonation;Chlorine compounds;Compressive strength;Cracks;Microstructure;Scanning electron microscopy;Carbonation resistance;Chloride;Degree of hydration;Micro voids;Polarizing microscopy;Polymer modified mortar;Water penetration;Mortar

摘要： In the present paper, the addition of silane to improve the properties of mortar was experimentally investigated. The morphology and microstructure of mortar were investigated by using both scanning electron microscopy (SEM) and polarizing microscopy (PM). The results show that silane significantly alters the microstructure of mortar, reduces the crystallization, restricts the degree of hydration of cement-based materials, and decreases micro-voids. As a result, silane effectively improves the chemical and carbonation resistance, as well as the chloride and water penetration resistance of mortar. Results also indicate that the consistency of mortar was improved but the compressive strength of the mortar was decreased. Specifically, silane would also be beneficial to the bridging cracking function to resist crack propagation.

语种： 英文