作者： 刘珏;王亦龙;袁健;尹健;田冬梅;...

期刊： 教育教学论坛,2020年(31):209-211 ISSN：1674-9324

作者机构： 中南林业科技大学土木工程学院;中南林业科技大学工程流变学湖南省重点实验室;[王亦龙] 湖南麓谷建设工程有限公司;[袁健; 邓涵文; 尹健; 刘珏; 田冬梅] 中南林业科技大学

关键词： 交叉学科;土木工程材料;教学方法;问题分析

摘要： 交叉学科类课程对于***复合型人才的培养具有重要意义。针对土木工程材料课程教学过程中存在的问题及面临的挑战,科学构建学生、教师、企业三位一体的新型教学模式,即在建立专业的教学团队的基础上,借助企业工程背景,充分调动学生的积极性和主动性。结合该课程的特点和教学目标,从教学内容、教学方法、教学手段等方面进行了相应的改革与探索。该模式可为新工科背景下交叉学科培养复合型创新人才提供借鉴。

语种： 中文

作者： Liu, Jue;Yang, Qiumin;Yin, Jian*;Yang, Hailin*

期刊： Materials Science and Engineering C: Materials for Biological Applications,2020年110:110542 ISSN：0928-4931

通讯作者： Yin, Jian;Yang, Hailin

作者机构： [Yin, Jian; Liu, Jue] Cent South Univ Forestry & Technol, Hunan Prov Key Lab Engn Rheol, Changsha 410004, Peoples R China.;[Yang, Qiumin] Jiangxi Univ Sci & Technol, Dept Mat Met & Chem, Ganzhou 341000, Peoples R China.;[Yang, Hailin] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China.

通讯机构： [Yin, Jian; Yang, Hailin] C;Cent South Univ Forestry & Technol, Hunan Prov Key Lab Engn Rheol, Changsha 410004, Peoples R China.;Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China.

关键词： Alloying;Alloying elements;Annealing;Biocompatibility;Diffusion;Electrons;Fabrication;High resolution transmission electron microscopy;Mechanical properties;Medical applications;Metal testing;Microstructure;Niobium alloys;Powder metallurgy;Scanning electron microscopy;Sintering;Solid solutions;Tantalum alloys;Tensile strength;Tensile testing;Ternary alloys;Textures;Tissue engineering;X ray detectors;Biomedical applications;Electron back-scattered diffraction;Electron probe microanalyses;Elemental powders;Microstructure and mechanical properties;Powder metallurgical;Solid solution strengthening;Strengthening effect;Titanium alloys;alloy;niobium;tantalum;titanium;cell line;chemistry;human;materials testing;Alloys;Cell Line;Humans;Materials Testing;Niobium;Tantalum;Titanium

摘要： Powder metallurgical (PM) Nb-25Ta-xTi alloys (x = 5, 15, 25, 35 at.%) were fabricated by the elemental powder sintering technology. Effects of alloying elements and annealing treatment on the microstructural evolution and mechanical properties were investigated by conducting various tests, including X-ray diffraction (XRD), scanning electron microscopy (SEM), electron probe microanalyses (EPMA), electron back scattered diffraction detector (EBSD), transmission electron microscopy (TEM) and tensile tests. The results indicated that the alloys showed a unique Nb-rich and Ta-rich dual structure due to the insufficient diffusion between powders. With the increase of Ti content, the β phase was always retained and the alloys exhibited a relatively high density in the range of 82.4% to 90.5%. Furthermore, owing to a higher diffusion coefficient of Ti and the strengthening effect of solid solution, the volume shrinkage and tensile strength both increased along with the increase of Ti content. After the annealing treatment was introduced, the microstructure became more homogeneous and fine equiaxed grains appeared, which induced a decrease in modulus and better ductility. The Nb-25Ta-25Ti alloys exhibited a good in vitro biocompatibility due to the chemical components and the introduce of surface pores. The PM Nb-Ta-Ti alloys were promising for biomedical applications in tissue engineering after evaluated both mechanical properties and in vitro biocompatibility. © 2020 Elsevier B.V.

语种： 英文

作者： 刘珏;袁健;王亦龙;尹健

期刊： 西部素质教育,2020年6(13):148-149 ISSN：2095-6401

作者机构： 中南林业科技大学土木工程学院;中南林业科技大学工程流变学湖南省重点实验室;[王亦龙] 湖南麓谷建设工程有限公司;[袁健; 尹健; 刘珏] 中南林业科技大学

关键词： 材料类公共选修课;学科交叉;信息化教学

摘要： 文章首先阐述了公共选修课概况,然后论述了材料类人才培养现状及材料类公共选修课设置的必要性,最后提出了材料类公共选修课建设的改革与实践,包括科研精神渗透教学环节、课程内容注重学科交叉及文理结合、借助信息化教学方式等。

语种： 中文

作者： Zhang, Cong;Yang, Junsheng*;Fu, Jinyang*;Wang, Shuying;Yin, Jian;...

期刊： Journal of Cleaner Production,2020年268:121947 ISSN：0959-6526

通讯作者： Yang, Junsheng;Fu, Jinyang

作者机构： [Yin, Jian; Zhang, Cong] Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha 410004, Peoples R China.;[Wang, Shuying; Xie, Yipeng; Yang, Junsheng; Fu, Jinyang] Cent South Univ, Sch Civil Engn, Changsha 410075, Hunan, Peoples R China.

通讯机构： [Yang, JS; Fu, JY] C;Cent South Univ, Sch Civil Engn, Changsha 410075, Hunan, Peoples R China.

关键词： 3D modeling;Concrete construction;Environmental protection;Fly ash;Grouting;Linear programming;Machinery;Mortar;Recycling;Regression analysis;Shielding;Soil cement;Soils;Sustainable development;Tunneling (excavation);Wages;Engineering applications;Environmental concerns;Experimental investigations;Non-linear regression analysis;Selection and optimizations;Shield tunnel construction;Sustainable raw materials;Unconfined compression strength;Tunnels

摘要： EPB shield tunnel construction will discharge a large amount of soil. Directly transporting this discharged soil to dumping grounds not only increases the machinery and labor costs but also raises environmental concerns. In this paper, we presented and explored a guiding framework for recycling the discharged soil from EPB shield tunnel construction as the raw materials for synchronous grouting. The proposed method was proved to be feasible by a detailed experimental study based on samples taking from the Zhengzhou metro line 3 project. The preparation and formulation process of those raw materials was designed to meet the requirements not only for engineering application but also for green environmental protection and sustainable development. The properties and performance of the synchronous grouting material, including its specific gravity, fluidity, gel time, bleeding rate, bulk shrinkage rate and unconfined compression strength, were investigated by the U15∗ (154) uniform design experimentation. The effects of ratios of water/binder (cement + fly flash), the binder/coarse-grains (the discharged soil from the west bound tunnel + river sand), fine-grains (the discharged soil from the east bound tunnel)/water and the fly flash/cement on the response value of the synchronous grouting material performances have been investigated with stepwise nonlinear regression analysis model and 3D response surface diagrams. Moreover, the optimal mass ratio for the synchronous grout is also proposed with a new Goal Programming model to obtain an optimum performance. The results indicate that the discharged soil from the east bound tunnel in this project can be directly reused as bentonite, while the discharged soil from the west bound tunnel should be mixed with river sand at a mass ratio of 1:1 before reusing it as the raw material of synchronous grout. Furthermore, the performance of the synchronous grouting was demonstrated highly depending on the proper selection and optimization of mass ratios for water/binder, binder/coarse-grains, fine-grains/water and fly-ash/cement. The presented experimental investigation and the proposed strategy for determining the optimal formulation for synchronous grouting materials demonstrated a feasible way of recycling discharged soil from EPB shield tunnel construction. © 2020 Elsevier Ltd

语种： 英文

作者： Zhang, G.*;Yin, J.;Li, S.

期刊： Materialwissenschaft und Werkstofftechnik,2020年51(9):1234-1241 ISSN：0933-5137

通讯作者： Zhang, G.

作者机构： [Yin, J.; Zhang, G.] Cent South Univ Forestry & Technol, Coll Civil Engn, Changsha 410018, Peoples R China.;[Li, S.] Hunan Univ, Coll Civil Engn, Key Lab Green & Adv Civil Engn Mat & Applicat Tec, Changsha 410082, Peoples R China.

通讯机构： [Zhang, G.] C;Cent South Univ Forestry & Technol, Coll Civil Engn, Changsha 410018, Peoples R China.

关键词： Pore size;Pore structure;Vegetation;Penetration coefficient;Pore characteristics;Porous concretes;Root system;Structural compatibility;Concretes

摘要： To investigate the structural compatibility of eco-porous concrete (EPC) and vegetation, a simulation method (sand penetration coefficient) of structure compatibility between the eco-porous concrete (EPC) and vegetation was put forward. Furthermore, the relation between sand penetration coefficient and pore characteristics were analyzed, and the technology of acquiring equivalent pore size was optimized. The results present that the new simulation method, characterized by sand penetration coefficient, can effectively assess the ability of eco-porous concrete (EPC) to allow the root system to pass through. In addition, the real pore structure shape by “rubbing technology” can be easily and quickly obtained. © 2020 Wiley-VCH GmbH

语种： 英文

作者： Li, Sheng;Yin, Jian*;Zhang, Gui

期刊： Construction and Building Materials,2020年249:118775 ISSN：0950-0618

通讯作者： Yin, Jian

作者机构： [Li, Sheng] Hunan Univ, Coll Civil Engn, Key Lab Green & Adv Civil Engn Mat & Applicat Tec, Changsha 410082, Hunan, Peoples R China.;[Yin, Jian; Zhang, Gui] Cent South Univ Forestry & Technol, Sch Civil Engn & Mech, 498 South Shaoshan Rd, Changsha 410004, Peoples R China.;[Li, Sheng] Hunan Univ, Int Sci Innovat Collaborat Base Green & Adv Civil, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Yin, Jian] 4;498 South Shaoshan Rd, Changsha 410004, Peoples R China.

关键词： Porous sea sand concrete mixture;pH value reduction;Fundamental performance;Vegetation performance;Tall fescue

摘要： The purpose of this paper is to investigate the effect of different methods on reducing the pH value of soil in Porous Sea Sand Concrete Mixtures (PSSCM) through a series of experiments. Thereinto, the X-ray diffraction (XRD) technology was applied to analyzing the mechanism of pH value change, and the relationship between the fundamental performance (effective porosity, sound absorption coefficient and compressive strength) and the optimum mixture proportion of PSSCM successfully. In all experiments, plant varieties which have a high matching degree with PSSCM were screened out, and the vegetation performance of PSSCM was verified by field investigation. Consequently, it is showed that the content of calcium hydroxide in PSSCM was positively correlated with the pH value of soil in PSSCM. The four approaches, adding mineral admixtures, appending acid-modified materials, accelerating carbonization, and immersing Deep penetration sealer (DPS), help reduce the pH value. Among them, the lowest pH value (7.8) was obtained by the addition of 10% silica fume, accelerating carbonization for 28 days, and subsequently immersing in DPS for 28 h. Besides, these methods all reduce PSSCM pore and soil pH value by consuming calcium hydroxide. In addition, the best fundamental performance was obtained on the condition that the water-cement ratio of PSSCM was 0.26 and the effective porosity of PSSCM was 25.95%. Likewise, the matching degree between tall fescue and PSSCM was the best under this pH condition. After 120 days of sowing, their stems were thick and strong, and leaves were green and lush. In the meantime, their rhizomes length exceeds 8 cm. (C) 2020 Elsevier Ltd. All rights reserved.

语种： 英文

作者： Zhang, Cong;Yang, Junsheng;Fu, Jinyang*;Wang, Shuying;Yin, Jian;...

期刊： Construction and Building Materials,2020年261:120513 ISSN：0950-0618

通讯作者： Fu, Jinyang

作者机构： [Yin, Jian; Zhang, Cong] Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha 410004, Hunan, Peoples R China.;[Wang, Shuying; Xie, Yipeng; Yang, Junsheng; Fu, Jinyang] Cent South Univ, Sch Civil Engn, Changsha 410075, Hunan, Peoples R China.;[Ou, Xue Feng] Changsha Univ Sci & Technol, Sch Civil Engn, Changsha 410114, Hunan, Peoples R China.

通讯机构： [Fu, Jinyang] C;Cent South Univ, Sch Civil Engn, Changsha 410075, Hunan, Peoples R China.

关键词： Grouting materials;Loose deposit;Response surface methodology;Formulation

摘要： Due to material requirements for grouting in loose deposits, a new polymer-modified cement grout (PMCG) material was designed by addicting polyethylene glycol (PEG), polycarboxylate superplasticizer (PS) and sodium silicate into the cement grout. Then, the properties of PMCG were predicted statistically by using the response surface method (RSM) and the effects of the four parameters (w/c, PEG content, sodium silicate content and PS content) as well as their interaction on the response variables (fluidity, bleeding rate, gel time, and early strength) were investigated. Furthermore, the optimal formulation of PMCG (w/c of 0.9, 8.7% sodium silicate, 4% PEG and 1% PS) can be obtained using a multi-objective optimization technique considering the multi-performance requirements of grouting material in loose deposit. Finally, the macro-performance of the grouting material formed by optimal formulation was validated by a set of experiments. The results demonstrated that the proposed designing method can work effectively in determining the optimal formulation of the grouting material to meet various engineering demands. (C) 2020 Elsevier Ltd. All rights reserved.

语种： 英文

作者： He, Xiao;Yin, Jian*;Yang, Jiewen;Liang, Qiao;Wu, Songyun

期刊： Materiali in Tehnologije,2019年53(2):177-182 ISSN：1580-2949

通讯作者： Yin, Jian

作者机构： [Yin, Jian; Liang, Qiao; Yang, Jiewen; He, Xiao; Wu, Songyun] Cent South Univ Forestry & Technol, Sch Civil Engn, 498 Shaoshan South Rd, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Yin, Jian] C;Cent South Univ Forestry & Technol, Sch Civil Engn, 498 Shaoshan South Rd, Changsha 410004, Hunan, Peoples R China.

关键词： Autoclaved aerated concrete;Dry-wet circulation;Image-Pro-Plus;Mechanical properties;Pore structure

摘要： Dry-wet circulation is the main service environment for autoclaved aerated concrete. In this study, we looked at selected autoclaved aerated concrete with dry-wet circulation times of (0, 30, 60, 150, 270 and 340) min. The tested mechanical properties include the compressive strength and the splitting tensile strength. Scanning electron microscopy (SEM) and Image-Pro-Plus (IPP) software were chosen to quantitatively characterize the microstructure. The results showed that as the dry-wet circulation times increased, the compressive strength decreased after first increasing, and the splitting tensile strength reduced. In addition to the pore structure, microcracks and internal acicular ettringite were produced. The pore size distribution was concentrated from 1.0 mm to 1.5 mm, when dry-wet cycle times were 60 min or more. © 2019 Materials and technology.

语种： 英文

作者： Chunning Deng;Weiqun Cai;Jian Yin;Fen Yang;Linchen Li

期刊： International Journal of Transportation Engineering and Technology,2019年5(4):97-102 ISSN：2575-1743

作者机构： [Chunning Deng; Weiqun Cai; Jian Yin; Fen Yang; Linchen Li] College of Civil Engineering, Central South University of Forestry and Technology, Changsha, China

关键词： Autoclaved Aerated Concrete (AAC);Moisture Content;Uniaxial Loading;Peak Strain;Stress-strain Curve

摘要： Autoclaved aerated concrete (AAC) is a new type of green building material rapidly developed nowadays. Moisture content plays a significant effect on its mechanical properties. In this study, a series of uniaxial compression tests were conducted to evaluate the effect of moisture content on the mechanical behaviors. During the tests, full stress-strain curves were obtained. The influence of water content on AAC stress-strain full curve shape, elastic modulus, peak stress, peak strain and ultimate strain was analyzed. The fitting equations of water content with peak stress, peak strain and elastic modulus were established. The results show that the brittleness of AAC decreased with the increased of water content, and the failure mode gradually transited from brittle to ductile failure. When the water content increased from 0% to 10%, obvious difference in the stress-strain curves can be observed. The peak stress decreased by 20.00% and 11.63% when the moisture content was 5% and 10%, respectively. However, when the water content increased from 10% to 40%, the peak stress decreased slowly. The rising section relation model of AAC stress-strain full curve can be fitted by cubic polynomial, which provided reference basis for finite element analysis.

语种： 英文

作者： Zhang, G.*;Yin, J.;Li, S.

期刊： Materialwissenschaft und Werkstofftechnik,2019年50(11):1399-1406 ISSN：0933-5137

通讯作者： Zhang, G.

作者机构： [Zhang, G.] Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100444, Peoples R China.;[Yin, J.] Cent South Univ Forestry & Technol, Coll Civil Engn, Changsha 410004, Hunan, Peoples R China.;[Li, S.] Hunan Univ, Coll Civil Engn, Key Lab Green & Adv Civil Engn Mat & Applicat Tec, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Zhang, G.] B;Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100444, Peoples R China.

关键词： Aggregates;Porosity;Vegetation;Aggregate gradations;Calculation formula;Characteristic analysis;Concrete model;gradation curve;Normal concretes;Porosity calculations;Porous concretes;Concretes

摘要： Porosity acts as a key role in realizing the planting function of vegetation-type porous concrete. However, the porosity depends on the aggregate gradation characteristic. Then, compared with the gradation characteristic of normal concrete, the gradation characteristic of vegetation-type porous concrete is discussed. Furthermore, the porosity calculation of vegetation-type porous concrete with three kinds of grain-size-ranges (9.5 mm-16 mm, 16 mm-19 mm and 19 mm-26.5 mm) is deduced. Results present that the stacking theory is more suitable than the filling theory to describe the aggregate accumulation pattern. Besides, the calculation formula is deduced, which can effectively calculate the porosity of vegetation-type porous concrete. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

语种： 英文

作者： He, Xiao;Yin, Jian*;Yang, Jiewen;Liang, Qiao;Wu, Songyun

期刊： Materiali in Tehnologije,2019年53(2):171-175 ISSN：1580-2949

通讯作者： Yin, Jian

作者机构： [Yin, Jian; Liang, Qiao; Yang, Jiewen; He, Xiao; Wu, Songyun] Cent South Univ Forestry & Technol, Sch Civil Engn, 498 Shaoshan South Rd, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Yin, Jian] C;Cent South Univ Forestry & Technol, Sch Civil Engn, 498 Shaoshan South Rd, Changsha 410004, Hunan, Peoples R China.

关键词： coarse aggregate;particle shape;sphericity;flatness;void content

摘要： To quantitatively characterize the shape of coarse aggregates, a needle flake gauge meter was used to sieve coarse aggregates. The image technique was used to carry out the operations of edge recognition, greying and image binarization. Image-Pro Plus was employed to obtain the grain-shape parameters of the coarse aggregates, including sphericity and flatness. Tested void contents were obtained for the coarse aggregates so that the relationship between the shape parameters (sphericity, flatness) and the accumulated void content was analyzed. The results showed that the minimum values of sphericity and flatness were 0.67 and 1.01 while the maximum values were 0.88 and 1.9, respectively. Sphericity was positively correlated with the void content of the coarse aggregate; on the contrary, flatness was negatively correlated with the void content. At the same condition of the mixture, compared to sphericity, flatness showed a higher correlation. © 2019 Materials and technology.

语种： 英文

作者： Song, Weimin;Yi, Jin*;Wu, Hao;He, Xiao;Song, Qingwei;...

期刊： Journal of Cleaner Production,2019年238:117819 ISSN：0959-6526

通讯作者： Yi, Jin;Yin, Jian

作者机构： [Wu, Hao; Song, Weimin] Cent South Univ, Sch Civil Engn, 22 South Shaoshan Rd, Changsha 410075, Hunan, Peoples R China.;[Yin, Jian; Yi, Jin; Yin, J; He, Xiao] Cent South Univ Forestry & Technol, Sch Civil Engn & Mech, Changsha 410004, Hunan, Peoples R China.;[Wu, Hao] Cent South Univ, Natl Engn Lab High Speed Railway Construct, 22 South Shaoshan Rd, Changsha 410075, Hunan, Peoples R China.;[Song, Qingwei] Zhongyuan Univ Technol, Sch Construct Engn, 41 Middle Zhongyuan Rd, Zhengzhou 450007, Henan, Peoples R China.

通讯机构： [Yi, J; Yin, J] C;Cent South Univ Forestry & Technol, Sch Civil Engn & Mech, Changsha 410004, Hunan, Peoples R China.

关键词： Analysis of variance (ANOVA);Blast furnaces;Carbon fibers;Compressive strength;Concrete beams and girders;Concrete mixtures;Cost benefit analysis;Creep;Creep resistance;Drying;Portland cement;Slags;Creep coefficient;Different proportions;Drying shrinkages;Effect of carbons;Granulated blast furnace slag;Granulated blast-furnace slags;Mechanical performance;Prediction model;Shrinkage

摘要： Concretes with binary and ternary blends of Portland cement, granulated-blast furnace slag (GGBS), and carbon fiber (CF) were prepared to investigate their effects on mechanical performance, drying shrinkage and creep behaviors. Nine types of concrete mixtures were prepared and tests were conducted during a long testing period which was up to 180 days. Research showed that GGBS and CF played a detriment effect on short-term compressive strength. GGBS could improve the workability of concretes, while CF presented an opposite effect. Concrete with the addition of CF showed superior drying shrinkage resistance and creep resistance, while GGBS increased the drying shrinkage and creep potentials. The coupling effect of GGBS and CF on the drying shrinkage and creep performance highly depended on the relative content of GGBS and CF. Analysis of variance (ANOVA) was performed to analyze the importance of GGBS and CF on the drying shrinkage and creep performance. Results showed that test period, content of GGBS, and content of CF were all significant factors in influencing the drying shrinkage and creep behaviors. Models to predict the drying shrinkage strain and creep coefficient were proposed by considering different proportions of cement, GGBS, and CF, and the models give promising results. Besides, the cost-benefit analysis and the environmental impact were also quantitively studied, and results showed that concretes incorporated with 20% GGBS in mass and 0.1% or 0.2% CF in volume presented both good cost-benefit effectiveness and low environmental impact. © 2019 Elsevier Ltd

语种： 英文

作者： Liu, Kefei;Zhu, Juncai;Zhang, Kun*;Wu, Junliang;Yin, Jian;...

期刊： Construction and Building Materials,2019年217:301-309 ISSN：0950-0618

通讯作者： Shi, Xianming;Zhang, Kun

作者机构： [Yin, Jian; Liu, Kefei; Zhu, Juncai] Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha 410004, Hunan, Peoples R China.;[Liu, Kefei; Wu, Junliang; Shi, Xianming] Washington State Univ, Voiland Coll Engn & Architecture, Dept Civil & Environm Engn, POB 642714, Pullman, WA 99164 USA.;[Zhang, Kun] Calif State Univ Chico, Dept Civil Engn, Chico, CA 95929 USA.

通讯机构： [Shi, Xianming] W;[Zhang, Kun] C;Washington State Univ, Voiland Coll Engn & Architecture, Dept Civil & Environm Engn, POB 642714, Pullman, WA 99164 USA.;Calif State Univ Chico, Dept Civil Engn, Chico, CA 95929 USA.

关键词： Fourier transform infrared (FTIR);Graphene oxide (GO);Mixing sequence;Warm mix asphalt (WMA);Waste cooking oil (WCO)

摘要： In this work, the effects of mixing sequence of graphene oxide (GO) and warm mix additives on the mechanical properties of the composite modified asphalt binder (CMAB) were evaluated. The warm mix additives included Sasobit® and waste cooking oil (WCO). The experimental results indicated that the combination of GO and Sasobit® can greatly improve the high-temperature performance of asphalt, and the blending of GO and WCO can significantly enhance the fatigue and low-temperature properties of the asphalt. Statistical analysis results suggested that different GO and Sasobit® mixing sequences have significant influence on the workability, mechanical properties, and chemical reaction characteristics of the CMABs, while the influence of different GO and WCO mixing sequences on these properties of asphalt is not significant. In conclusion, GO is suggested to be added first to achieve the better performance of the nano-modified asphalt binder. © 2019

语种： 英文

作者： Li, Sheng;Yin, Jian*;Zhang, Gui;Gao, Ting

期刊： Materiali in Tehnologije,2019年53(4):575-581 ISSN：1580-2949

通讯作者： Yin, Jian

作者机构： [Yin, Jian; Li, Sheng; Zhang, Gui; Gao, Ting] Cent South Univ Forestry & Technol, Coll Civil Engn, Changsha 410018, Hunan, Peoples R China.;[Li, Sheng] Hunan Univ, Coll Civil Engn, Key Lab Green & Adv Civil Engn Mat & Applicat Tec, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Yin, Jian] C;Cent South Univ Forestry & Technol, Coll Civil Engn, Changsha 410018, Hunan, Peoples R China.

关键词： Alkalinity;Carbonation;Compressive strength;Ecological porous concrete mixture;Mineral admixtures

摘要： In this article, XRD was utilized to analyze the alkalinity affecting the pore size of an ecological porous concrete mixture (EPCM). Variations in the pore alkalinity and compressive strength of the EPCM with different mineral admixtures were investigated using accelerated carbonization and natural carbonization. The experimental results demonstrate that the content of calcium hydroxide is positively related to the pH value of EPCM pores and both indexes increase with age. Combining accelerated carbonization and additions of mineral admixtures considerably reduced alkalinity and showed no harmful effect on the compressive strength. The lowest pH value (8.57) was achieved after 56 d and the compressive strength was slightly improved. Having such an environment, tall fescue can grow in an EPCM and the height of plants is more than 15 cm on the 56th day. ©, Institute of Metals and Technology, Ljubljana, Slovenia.

语种： 英文

作者： He, Xiao;Yin, Jian;Yang, Jiewen;Liang, Qiao;Wu, Songyun

期刊： Advances in Materials Science and Engineering,2019年2019:1-12 ISSN：1687-8434

通讯作者： Yin, J

作者机构： [He, Xiao; Yin, Jian; Yang, Jiewen; Liang, Qiao; Wu, Songyun] Cent South Univ Forestry & Technol, Sch Civil Engn, Shaoshan South Rd 498, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Yin, J ] ;Cent South Univ Forestry & Technol, Sch Civil Engn, Shaoshan South Rd 498, Changsha 410004, Hunan, Peoples R China.

摘要： <jats:p>Moisture absorbability is the characteristic of autoclaved aerated concrete that differs from other wall materials. For autoclaved aerated concrete, dry-wet circulation is the main actual service environment and can directly affect moisture absorbability, which influences cracking performance of structure. In this study, autoclaved aerated concrete with dry-wet circulation times of 0, 30, 60, 150, and 270 is selected. The experiment is performed under the condition of temperatures 20°C, 30°C, 40°C, and 50°C and relative humidities (RH) of 40%, 60%, and 80%. The temperature and humidity have significant effects on moisture absorption. When the dry-wet circulation times are increased, the moisture absorption performance improves; when comparing the specimen at the dry-wet circulation of 0 times with the specimen of dry-wet circulation of 270 times, the amount of moisture absorption content increased by 85.7%, at the temperature of 50°C and RH of 80%. Origin software is chosen to fit the moisture absorption kinetics model. SPSS software is used to analyse the linear regression and variance. The results of hygroscopic kinetics showed that the fitting effect of the double exponential function was optimal, and the temperature and humidity were closely correlated with the specimens under dry-wet circulation, for <jats:italic>R</jats:italic><jats:sup>2</jats:sup> greater than 0.941.</jats:p>

语种： 英文

作者： Weiqun Cai;Jian Yin;Songyun Wu;Chunning Deng;Fen Yang;...

期刊： International Journal of Transportation Engineering and Technology,2019年5(4):103-110 ISSN：2575-1743

作者机构： [Weiqun Cai; Jian Yin; Songyun Wu; Chunning Deng; Fen Yang; Linchen Li; Jiongjun Yuan] College of Civil Engineering, Central South University of Forestry and Technology, Changsha, China

关键词： Cement Mortar;Flexural Strength;Compressive-flexural Ratio;Polypropylene Fiber;Orthogonal Test

摘要： In this study, laboratory tests were conducted to investigate the mechanical behaviors of cement mortars incorporated with different admixtures, such as polypropylene fiber (PP), slag, silica fume and fly ash. Orthogonal tests were designed to evaluate the effects of the admixtures on the brittleness. The flexural strengths and the compressive-flexural ratios were selected to evaluate the brittleness. The optimal proportion can be obtained when PP content was 1.6 kg/m3, and the content of fly ash, slag and silica fume was 10%, 20% and 3% of the cement content respectively. Using the optimal proportion, the 3d flexural strength of cement mortar was 5.65 MPa, which was 19% larger than the specimens without the addition of admixtures; the compressive-flexural ratio was 4.1, which was reduced by 19% in contrast to the control group. The flexural strength at 28d was 9.04 MPa, which was 13% higher than the control group; and the compressive-flexural ratio was 4.21, decreasing 24% compared to the control group. SEM technology was utilized to characterize the evolution of the microstructure induced by the addition of mineral admixtures and PP fiber. Results showed that mineral admixtures made the mortars denser, and the PP fiber formed a cross-linking structure, improving the brittle-resistance. The test results provided some guidance for the mixture design of pavement concrete with a high flexural strength and a low brittleness.

语种： 英文

作者： 曾超;丁科;尹健

期刊： 混凝土,2018年(12):140-143 ISSN：1002-3550

作者机构： 中南林业科技大学 土木工程学院,湖南 长沙,410004;[丁科; 尹健; 曾超] 中南林业科技大学

关键词： 多孔混凝土;图像处理;图像分析孔隙率;实测孔隙率;数盒子数法;分形维数

摘要： 制备生态多孔混凝土试件,切片后,采用数字图像处理技术,通过对切片处理方案的选择对比,选取合理的切片图像处理方案;应用PS、MATLAB、IMAGE PRO PLUS、IMAGE J等软件对多孔混凝土试件切片切面进行处理分析,计算试件的图像分析孔隙率,与实测孔隙率比较分析;用数盒子数法计算生态多孔混凝土试件孔隙结构分形维数并建立其孔隙结构特征与分形维数的关系。试验结果表明:各生态多孔混凝土试件的实测孔隙率都不相同,但都在20%～30%的目标孔隙率之间;各生态多孔混凝土试件的分形维数都不相同,说明了生态多孔混凝土孔隙结构的复杂性、不规则性和多样性;分形维数与实测孔隙率密切相关。

语种： 中文

作者： Zhang, Gui;Yin, Jian*;Li, Sheng;Sang, Zhenghui;Xiong, Yao;...

期刊： Materiali in Tehnologije,2018年52(2):183-188 ISSN：1580-2949

通讯作者： Yin, Jian

作者机构： [Yin, Jian; Hu, Xiongwei; Xiong, Yao; Li, Sheng; Zhang, Gui; Gao, Ting; Sang, Zhenghui] Cent South Univ Forestry & Technol, Coll Civil Engn, Changsha 410018, Hunan, Peoples R China.

通讯机构： [Yin, Jian] C;Cent South Univ Forestry & Technol, Coll Civil Engn, Changsha 410018, Hunan, Peoples R China.

关键词： eco-porous concrete;fly ash;freeze-thaw resistance;mass loss;relative dynamic modulus of elasticity (RDME);freeze-thaw damage index (FTI)

摘要： Laboratory tests were conducted to evaluate the freeze-thaw resistance of eco-porous concrete containing fly ash. In order to address the freeze-thaw resistance of eco-porous concrete, the mass loss, compressive strength and relative dynamic modulus of elasticity (RDME) were obtained. Furthermore, based on the RDME, the freeze-thaw damage index (FTI) was provided to evaluate the internal damage. The results showed that the higher the amount of fly ash, the poorer is the frost resistance of porous concrete. The mass, compressive strength and RDME of specimens decreased with the increasing freeze-thaw cycles. The compressive strength decreased with an increase in fly ash, but the initial compressive strength is sufficient for requirements. Therefore, the content of fly ash should be controlled when producing eco-porous concrete and predicting its performance under freeze-thaw attacks with the explored method. © Institute of Metals and Technology, Ljubljana, Slovenia.

语种： 英文

作者： 池漪;尹健

期刊： 铁道科学与工程学报,2018年15(9):2327-2334 ISSN：1672-7029

作者机构： 湖南交通职业技术学院路桥工程学院, 湖南, 长沙, 410132;中南大学土木工程学院, 湖南, 长沙, 410075;中南林业科技大学土木工程学院, 湖南, 长沙, 410018;[池漪] 湖南交通职业技术学院路桥工程学院, 湖南, 长沙, 410132 中南大学土木工程学院, 湖南, 长沙, 410075;[尹健] 中南林业科技大学土木工程学院, 湖南, 长沙, 410018

关键词： 混凝土裂缝修补;力学相容性;强度比;破坏形态

摘要： 基于混凝土裂缝修补结构是否具有较好的力学相容性是修补效果好坏的关键。选取水泥净浆、纯聚合物、聚合物水泥净浆3种修补材料,通过一系列力学试验对混凝土裂缝修补结构的力学相容性进行探讨与研究。对比斜剪、劈拉、抗折以及组合梁抗折强度试验这4种试验方法,采用组合梁抗折强度试验方法能较为可靠有效地反映混凝土裂缝修补结构的力学相容性,用组合梁抗折强度比及其破坏形态来评价修补材料与基体的力学相容性也较为合适。研究结果表明:当保持这3种修补材料的3 d抗压强度在同一水平时,纯聚合物的其他力学性能包含"抗折强度、抗折黏结强度、抗拉强度、压折比"等的综合性能最优,并且用纯聚合物作为修补材料的混凝土裂缝修补结构的力学相容性也最好。

语种： 中文

作者： Yang, J.*;Gao, T.;Yin, J.;Wu, S.;Liang, Q.

期刊： Materialwissenschaft und Werkstofftechnik,2018年49(9):1108-1116 ISSN：0933-5137

通讯作者： Yang, J.

作者机构： [Gao, T.; Yang, J.; Liang, Q.; Wu, S.; Yin, J.] Cent South Univ Forestry & Technol, Coll Civil Engn, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Yang, J.] C;Cent South Univ Forestry & Technol, Coll Civil Engn, Changsha 410004, Hunan, Peoples R China.

关键词： Alkalinity;Carbonization;Compressive strength;Concretes;Oxalic acid;Silica fume;Sulfur compounds;Ferrous sulfate;hybrid alkalinity-reduced treatment;Laboratory test;pH value;Porous concretes;Reduction method;single alkalinity-reduced treatment;Treatment methods;pH

摘要： Laboratory tests were conducted to investigate the different alkalinity reduction methods. Single alkalinity-reduced treatment and hybrid alkalinity-reduced method were employed respectively. Single alkalinity-reduced treatment methods include oxalic acid soaking, oxalic acid spraying and deep penetrating sealer (DPS) spraying. The hybrid alkalinity-reduced method used silica fume (SF) and ferrous sulfate. Deep penetrating sealer spraying and rapid carbonization were performed in the hybrid alkalinity-reduced treatment. The compressive strength and alkalinity of eco-porous concrete were evaluated by employing different alkalinity-reduced methods. The results showed that effect of single alkalinity-reduced treatment on the strength of eco-porous concrete is not obvious. The 28-day compressive strength of the specimens was 7.8 MPa - 10.3 MPa and the pH value was about 10.4. By using hybrid alkalinity-reduced method, the rapid carbonization and alkali solidification gave the best performance in strength and alkalinity reduction. The 28-day compressive strength was 8.1 MPa and pH value was reduced to 10.0. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

语种： 英文