MRS Proceedings最新文献_第4页

Corrosion Control in Military Assets 军事资产腐蚀控制

MRS Proceedings Pub Date : 2016-12-01 DOI: 10.1557/OPL.2016.88

M. Schorr, B. Valdez, R. Salinas, Rogelio Ramos, N. Nedey, M. Curiel

{"title":"Corrosion Control in Military Assets","authors":"M. Schorr, B. Valdez, R. Salinas, Rogelio Ramos, N. Nedey, M. Curiel","doi":"10.1557/OPL.2016.88","DOIUrl":"https://doi.org/10.1557/OPL.2016.88","url":null,"abstract":"The combat fields of modern wars, including the struggle against global terrorism, are localized in diverse, harsh regions: tropical, desert, artic, marine, with varied weather conditions, which adversely affect the corrosion performance of the equipment and facilities involved. For the sake of brevity, three groups of military mobile and fixed equipment and structures are dealt with: armored ground wheeled vehicles; naval aluminum vessels, and buildings and facilities for providing dwellings, weapons storage and services to the armed forces. They are usually made from carbon steel, aluminum alloys and reinforced concrete, because of their useful properties: high strength, easy availability and low cost. However, due to their limited corrosion resistance they should be protected by coatings (including military coatings), but primarily paint; cathodic protection and corrosion inhibitors. All these systems suffer from several types of localized corrosion and degradation: galvanic, pitting, intergranular, dealloying, cavitation, erosion, stress cracking, UV effects in plastics and organic coatings. The military assets require the implementation of corrosion control methods and techniques through all their stages: design, construction, installation and operation. Typical cases of corrosion will be presented based on the authors experience and knowledge.","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"5 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87817724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Instrumented System for Analysis of Concrete Resistivity 混凝土电阻率分析仪器系统

MRS Proceedings Pub Date : 2016-12-01 DOI: 10.1557/OPL.2016.93

Karen Blanco, Víctor Manuel Moo Yam, T. P. López, J. R. L. Jiménez

{"title":"Instrumented System for Analysis of Concrete Resistivity","authors":"Karen Blanco, Víctor Manuel Moo Yam, T. P. López, J. R. L. Jiménez","doi":"10.1557/OPL.2016.93","DOIUrl":"https://doi.org/10.1557/OPL.2016.93","url":null,"abstract":"As is well known, the corrosion of embedded steel reinforced depends strongly of the concrete resistivity, which is related directly with the water contained into its porous network. Environment plays an important role on resistivity, due to have a direct correspondence with the relative humidity and temperature. In these terms, ingress or output of water is favored or hampered by the environmental parameters, as well as its fluctuations. This work presents a proposal of instrumented system to generate a map of electrical resistivity at concrete samples by using superficial and embedded electrodes. Mathematical analysis of equivalent circuit revealed the importance of the impedance of electrodes utilized, to simplify measures. Concrete samples were exposed to different relative humidity focused to try to obtain the relation between relative humidity and resistivity. An array of two electrodes distributed in a matrix was manufactured to apply a signal of direct current at first electrode and measure the resultant current at second electrode. The system applies a programmed sequence of switch to turn on and turn off to realize measurements over established zone and, in this form, allows identify zones with potentials gradients. Also, do easy the monitoring of concrete resistivity evolution in function of time and humidity conditions.","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"58 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86119377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Stirring Speed in Hot Mixing Process of Modified Asphalt with SBS Copolymer on Polymeric Distribution and its Rheological Properties SBS共聚物改性沥青热混过程中搅拌速度对聚合物分布及流变性能的影响

MRS Proceedings Pub Date : 2016-12-01 DOI: 10.1557/OPL.2016.5

E. García, R. H. Nájera

{"title":"Effect of Stirring Speed in Hot Mixing Process of Modified Asphalt with SBS Copolymer on Polymeric Distribution and its Rheological Properties","authors":"E. García, R. H. Nájera","doi":"10.1557/OPL.2016.5","DOIUrl":"https://doi.org/10.1557/OPL.2016.5","url":null,"abstract":"The current work reports the effect of particle size on the rheological behavior of polymer modified asphalt PMA. The modified asphalt was generated with AC-20 asphalt precursor provided by Pemex Salamanca and Solprene® 416 provided by Dynasol Mexico. Solprene® 416 is a SBS star-type copolymer with 4 poly(b-styrene-b-butadiene) arms and Mw = 2.36X105 g/gmole. Modified asphalt samples were prepared with 3 wt % of SBS via hot mix process. Mixing time and temperature were kept constant at 4h and 180 °C. This study also varied the agitation in the mixing process: 500, 1000 and 1500 rpm. All PMAs shown sphere-shaped polymer particles as observed via fluorescent microscopy using a Carl Zeiss KS-300 system. Base asphalt and PMAs were also characterized through rheological measurements using a TA Instruments AR-G2 rheometer. Shear viscosity (η) and tan δ data shown that the flow resistance of the PMA increases as the size its polymer particles decreases. Since the size of the polymer particles decreases with the increase of the stirring speed, it is concluded that the stirring speed of the process determines the size of the polymer particles and so the mechanical resistance of the PMA.","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"32 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86720242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Investigating Anvil Alignment and Anvil Roughness on Flow Pattern Development in High-Pressure Torsion 高压扭转中砧对和砧粗糙度对流型发展的影响研究

MRS Proceedings Pub Date : 2016-07-07 DOI: 10.1557/OPL.2016.79

Yi Huang, M. Kawasaki, T. Langdon

引用次数: 1

Evaluation of Single Layer Hafnium Nitride Coated Tool for Metal Cutting 金属切削用单层氮化铪涂层刀具的评价

MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.91

J. Devia, W. A. Chaparro, J. Lizarazo

引用次数: 5

Synthesis of SBA-15/MCM-41 bimodal mesoporous silica SBA-15/MCM-41双峰介孔二氧化硅的合成

MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.47

L. Jaramillo, W. Henao, E. Pabón-Gelves