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Development of Live Working robot for Replacing Insulators on Power Transmission Lines

Journal of Physics: Conference Series 2019年第2期1168卷

作者： Lanlan Liu Yu Yan Zhanfan Zhou Hao Guo Wen Li Zenghui Cao State Grid Hunan Maintenance Company Changsha 41000 China phone: + *** Hunan Province Key Laboratory of Intelligent Live Working Technology and Equipment (robot) Changsha 41000 China Live Patrol and IntelligentOperation Technology Laboratory of State Grid Changsha 41000 China Power Transmission Inspection Office of Yiyang Power Supply Branch of State Gride Hunan Power Co. LTD Changsha 41000 China

The paper presented the independently developed live working robot for replacing insulators on 110-220kV power transmission lines. By control system and simulating the manual equipotential live working process of replacing insulators, the robot is designed to be composed of a non-obstacle-surmounting platform, a control platform and a ground base station, among which the non-obstacle-surmounting platform mainly consists of the robot body, two robot arms, two robot hands, and two end-effectors, the control platform consists of a motion control system, a communication system, an image capture system and a power management system, and the ground base station consists of an industrial PC equipped with a wireless network interface card and a 3G network interface card. Moreover, the robot is designed to be protected against electromagnetic interference. The robot presented in this paper is the first of its kind in China.

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Effect of Seawater on Microstructure of Concrete-A Review

Effect of Seawater on Microstructure of Concrete-A Review

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第九届水泥混凝土国际会议

作者： Li Huang Nima Farzadnia Shi Caijun Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil EngineeringHunan University

Exposure of concrete to seawater impairs its performance due to chemical reactions between seawater constituents and the cement hydration *** paper reviews the effect of seawater on microstructure of concrete with a mainfocus on the formation of crystals,morphology,pore structure and phase change of hydration products by using SEM&EDX,TGA,XRD and *** is indicated that the exposure of seawater or mixed with seawater lead to the formation of crystals which reacted from salts in seawater and cement *** *** pore structure of concrete can be refined by precipitation formed by Mg,Cl,SOin seawater and hydration products of *** phase in cementitious materials and cement hydrates can also react with chloride and sulfate to form chloride binding,gypsum,*** formation of delayed ettringite by salts and cement hydrates resulted in the expansion of concrete.

关键词： seawater microstnicture hydration phase change concrete

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Surface Modification of PHBV Tissue Engineering Nanofibrous Scaffolds with Hyaluronic Acid

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hunan Daxue Xuebao/Journal of hunan University Natural Sciences 2017年第6期44卷 87-95页

作者： Liu, Hairong Huang, Jiying Zhou, Zheng Hu, Yibing Li, Yongsheng Zou, Peng Dai, Yao College of Materials Science and Engineering Hunan University Changsha410082 China College of Biology Hunan University Changsha410082 China Hunan Province Key Laboratory for Spray Deposition Technology and Application Hunan University Changsha410082 China Hunan Academy of Chinese Medicine Changsha410013 China

Surface properties of tissue engineering scaffold play important roles in cell adhesion and other biological processes such as cell proliferation, differentiation. In this study, the surface modification of Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) was performed in order to improve the biological activity of material surface. PHBV nanofibrous scaffold was firstly made by electrostatic spinning method, introducing free amino groups in the PHBV surface through 1, 6-hexanediamine, which provided reaction sites for the further immobilization of hyaluronic acid (HA) macromolecules. The morphology observed by SEM showed that PHBV nanofibrous scaffolds prepared by electrostatic spinning method have smooth surfaces without obvious beads defects and their fiber diameters uniformly distribute. FTIR analysis proved that 1, 6-hexanediamine and hyaluronic acid modified PHBV fibrous scaffolds were successfully achieved. The ninhydrin determination results showed that the surface amine group density, which increased with the extending of aminolysis time, reached its maximum at 50 minutes. Furthermore, there is no significant difference on the morphology of the scaffolds before and after modification by statistic comparison. The water contact angle significantly decreased after the immobilization of hyaluronic acid, indicating that the hydrophilicity was obviously improved after surface modification with the hydrophilic natural biological macromolecules. The Alamar Blue assay manifested that hyaluronic acid modified PHBV nanofibrous scaffolds could significantly promote the chondrocytes proliferation in vitro. Therefore, the hyaluronic acid modified PHBV nanofibrous scaffolds are potential for application in cartilage tissue engineering. © 2017, Editorial Department of Journal of hunan University. All right reserved.

关键词： Biocompatibility

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Potential Use of Calcined Kaolinite-Based Wastes as Cement Replacements in Concrete – An Overview

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IOP Conference Series: Materials Science and Engineering 2018年第3期431卷

作者： Yuxuan Liu Tung-Chai Ling Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University Changsha 410082 Hunan China

The use of supplementary cementitious material (SCM) to partially replace cement is a promising strategy to reduce CO2 emission and improve the overall sustainability of construction industry. Recent studies revealed that calcined clay could be used as a pozzolanic material and demonstrated an improvement in durability properties of concrete. The pozzolanic reactivity of calcined clay mainly depends on the kaolinite content due to its disordered crystal structure. They can use to replace cement at considerably high level (~30%), and even higher (~50%) if addition limestone powder is used. Since kaolinite is the key source of pozzolanic activity, reusing kaolinite-based waste materials could be a promising and sustainable approach instead of exploiting natural clay for calcined clay cement. This paper summarises recent published works on the use of calcined kaolinite waste as partial cement substitutions in concrete, including thermally activated coal gangue and pre-calcined clay brick and ceramic wastes which have been burnt in their fabrication process. The properties of concrete using these kaolinite-based waste materials are also discussed.

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Thermal and durability performances of mortar and concrete containing phase change materials

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IOP Conference Series: Materials Science and Engineering 2018年第6期431卷

作者： Sarra Drissi Tung-Chai Ling Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University Changsha 410082 Hunan China

Thanks to their latent heat storage, phase change materials (PCMs) continue to attract the interest of many researchers and industrialists. Microencapsulated and macroencapsulated PCMs are generally added directly or immersed into conventional buildings materials to improve thermal inertia and provide a better comfort to users. However, many drawbacks related to PCMs were noticed when they are incorporated into cement-based materials. This paper summarizes previous research concerning the use of PCMs on the thermal, mechanical and durability properties of mortar and concrete. Despite the obvious reduction of the mechanical strength, PCMs are still found to be good candidates to enhance the overall thermal performances of cement-based materials. It is therefore suggested that future researches should focus more on mitigating the impact of PCMs on the mechanical strength in order to gain a wider application of PCMs in concrete building applications.

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Acoustic emission assessment of interface cracking in thermal barrier coatings

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Acta Mechanica Sinica 2016年第2期32卷 342-348页

作者： Li Yang Zhi-Chun Zhong Yi-Chun Zhou Wang Zhu Zhi-Biao Zhang Can-Ying Cai Chun-Sheng Lu Key Laboratory of Key Film Materials & Application for Equipment (Hunan Province) School of Materials Science and EngineeringXiangtan University Key Laboratory of Low Dimensional Materials & Application Technology (Ministry of Education) School of Materials Science and EngineeringXiangtan University Department of Mechanical Engineering Curtin University

In this paper,acoustic emission（AE） and digital image correlation methods were applied to monitor interface cracking in thermal barrier coatings under *** interface failure process can be identifie via its AE features,including buckling,delamination incubation and *** to the Fourier transformation of AE signals,there arefourdifferentfailuremodes：surfaceverticalcracks,opening and sliding interface cracks,and substrate *** characteristic frequency of AE signals from surface vertical cracks is 0.21 MHz,whilst that of the two types of interface cracks are 0.43 and 0.29 MHz,*** energy released of the two types of interface cracks are 0.43 and 0.29 MHz,*** on the energy released from cracking and the AE signals,a relationship is established between the interface crack length and AE parameters,which is in good agreement with experimental results.

关键词： Thermal barrier coatings Acoustic emission Interface cracking Crack type Quantitative analysis

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Some Progresses in the Challenges for Geopolymer

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IOP Conference Series: Materials Science and Engineering 2018年第2期431卷

作者： N Li Z Zhang C Shi J Zhang Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University Changsha 410082 China

Geopolymer is manufactured by chemical activation of industrial by-products, which include blast furnace slag, fly ash, steel slag, phosphorus slag etc, with alkali activators, such as the sodium silicate, sodium carbonate and sodium hydroxide and their mixtures. It has attracted worldwide attention due to its advantages of simple production process, low energy consumption, effective utilisation of industrial by-products and reduction of greenhouse gas emissions. However, as materials vary substantially in physicochemistry properties, hardening, workability and durability of deriving geopolymer products vary accordingly. Slag-based geopolymer usually set within a very short period of time (less than 30 min), while low calcium fly ash-based geopolymer takes long time (a couple of days) to set. Geopolymer binders cured at room temperature exhibited significantly higher shrinkage than Portland cement does, while thermal cured products are very volumetrically stable. Moreover, alkali-aggregate reaction can happen when alkali-reactive aggregates are used with geopolymer binders. These issues need to be considered in large scale applications. This paper reviews the current advance in the research of geopolymer.

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The Water Absorption Properties of SAP and Its Effects on the Rheological Properties of High Performance Cement-based Materials

The Water Absorption Properties of SAP and Its Effects on th...

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第九届水泥混凝土国际会议

作者： Jianhui LIU Caijun SHI Xianwei MA College of Civil Engineering Hunan University Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province Henan University of Urban Construction

SAP could be used as internal curing agent and effectively restrain the autogenous of high performance cement-based materials（HPC）.The process of SAP absorbing and releasing water changes the rheology of cement-based material,while the particle size of SAP has a great effect on this *** effects of different particle size distribution of SAP on the plastic viscosity and yield strength,of HPC,in the shear rate of 0-100 s and static within 80 min,were studied in this *** results show that SAP with large sizes causes the maximum yield stress and plastic viscosity to increase rapidly at the initial stage,and then makes the properties begin to reduce;when SAP with small sizes is more added,the phenomenon also *** phenomenon is closely related to the absorbing and releasing water dynamics of different size *** increase in the particle size of SAP,the time of absorbing water becomes long,the early plastic viscosity increases;moreover the time of releasing water is also prolonged,and plastic viscosity and at later stage is *** changes in absorbing and releasing water dynamics of different particle size SAP also a certain relation with the effect of grinding on SAP structure.

关键词： SAP High performance cement-based materials Absorption Rheology

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Synthesis of Mesoporous Calcium Silicate by Template Method and Its Adsorption Characteristic for Pb2+

Synthesis of Mesoporous Calcium Silicate by Template Method ...

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2017 3rd International Conference on Green Materials and Environmental Engineering（GMEE 2017)

作者： Li-hua LIU Tong LI Jin-yan LIU Bo-qiang HU Zhi-hua ZHOU An-ping TANG School of Chemistry and Chemical Engineering Hunan University of Science and Technology Key Laboratory of Theoretical Organic Chemistry and Function Molecule Ministry of Education Hunan Province Key Laboratory of Controllable Preparation and Function Application of Fine Polymer

Mesoporous calcium silicate（MCS） was synthesized by template method using calcium nitrate tetrahydrate and sodium metasilicate nonahydrate as raw materials, cetyl trimethyl ammonium bromide-tetramethyl ammonium hydroxide as template. Its structure was characterized by X-ray diffraction（XRD）, Fourier transform infrared spectroscopy（FT-IR）,Brunuaer–Emmett–Teller（BET） surface analysis, and scanning electron microscopy（SEM）. The adsorption characteristics of MCS for Pb were investigated. Results show that MCS possesses a slit-pore structure with a specific surface area of 131.22 m·g. and pore size（DBJH） of 20 nm. The maximum adsorption capacities for Pb is 437.94 mg·g. at 293 K, which is much higher than those reported in the literature. The equilibrium data of Pb adsorbed by MCS fitted the Langmuir and Redlich–Peterson models, and more closely with the Redlich–Peterson model. The adsorption of MCS for Pb was a spontaneous endothermic reaction driven by increased entropy involving both physical and chemical modes. Thus, it is evident that MCS can be a promising excellent adsorbent for the treatment of Pb2+-containing wastewater.

关键词： Mesoporous calcium silicate Template synthesis method Lead Adsorption characteristic

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The Role of Particle Packing Characteristics in the Design and Performance of Eco-Crete

The Role of Particle Packing Characteristics in the Design a...

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第九届水泥混凝土国际会议

作者： Kamal H.Khayat Zemei Wu Iman Mehdipour Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering.Hunan University Department of Civil Architectural and Environmental EngineeringMissouri University of Science and Technology

There is a growing interest for enhancing particle packing of the solid skeleton in concrete in order to reduce the binder content and decrease the water and high range water reducer(HRWR) demand,hence improving material *** packing density of solid materials can lead to a decrease in paste content and a reduction of material cost and *** flowable concrete is especially critical to secure adequate Theological properties and stability given the high binder *** paper reviews the role of particle packing of aggregate and cementitious materials on mixture design and performance of ecologically friendly concrete(Eco-Crete).The effect of particle characteristics on key properties,including rheological properties,stability,and hardened properties of Eco-Crete are *** importance of particle packing of the granular skeleton on stability of cement-based materials is highlighted in terms of the particle lattice effect(PLE),where in a given fluid the sedimentation behavior of one particle or a group of particles is modified in the presence of other *** results indicate that the enhancement of packing density of granular skeleton can increase the lattice effect,which can improve the resistance of suspension to segregation,when maintained at rest or subjected to additional consolidation *** increase in higher packing density of aggregate can reduce plastic viscosity,develop relatively high compressive strength,but exert limited influence on *** packing density of the binder system is significantly related to the degree of dispersion of the *** a given binder composition,there exists an optimum dosage of HRWR dispersant to enhance packing density,beyond which further addition of the admixture may not change the packing density appreciably.

关键词： Eco-Crete mechanical properties mixture design packing density rheological properties sustainability

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