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Influence of Nano-Materials on Mechanical and Permeation Characteristics of High strength Concrete

Journal of Wuhan University of Technology(Materials science) 2022年第3期37卷 416-422页

作者： k v s gopala krishna sastry M srinivasula Reddy A Ravitheja Civil Engineering G Pulla Reddy Engineering CollegeKurnoolAPIndia svR Engineering College NandyalAndhra PradeshIndia

Efforts have been made to evaluate the influences of the addition of nanoparticles on the strength,durability and mineralogical changes of high strength concrete(HsC).Therefore,mixes were prepared for conventional concrete mix(CCM)of M80 ***,various mixes were prepared by replacing cementitious materials initially with 1%Nano-CaCO_(3)(NC),2%NC,3%NC in the CCM,and then 1%NC and Nano-siO_(2)(Ns)Ns,2%NC and Ns,3%NC and Ns(NC and Ns were in equal proportion)in the *** developed concretes were then evaluated for mechanical properties,permeation characteristics,and mineralogical *** the studies,it is found that the concrete at 2%NCs possesses superior mechanical and superior permeation characteristics of all the mixes.A clear variation in the mineralogical structure with the addition of nanoparticles has been observed.

关键词： high strength concrete nano silicon dioxide nano calcium carbonate mechanical properties permeation properties

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Microstructure and mechanical properties of similar and dissimilar metal gas tungsten constricted arc welds:Maraging steel to 13-8 Mo stainless steel

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Defence Technology（防务技术） 2019年第1期15卷 111-121页

作者： C.v.s.Murthy A.gopala krishna G.M.Reddy Defence Research and Development Laboratory Jawaharlal Nehru Technological University Defence Metallurgical Research Laboratory

Maraging steel (250) and 13-8 Mo stainless steel plates were joined by gas tungsten constricted arc welding(GTCAW) process in similar and dissimilar metal combinations using 13-8 Mo stainless steel filler wire. The similar and dissimilar metal welds made in solutionized condition were subjected to standard post weld hardening treatments direct ageing at 485 ℃, soaking for 31/2 hours followed by air cooling(ageing treatment of maraging steel) and direct ageing at 510 ℃, soaking for 4 h followed by air cooling(ageing treatment of 13-8 Mo stainless steel). The joint characterization studies include microstructure examination, microhardness survey across the weldments and transverse weld tensile *** and dissimilar metal weldments responded to both the post weld ageing treatment. After post weld aging, increase in yield strength, UTs and slight reduction in % elongation of similar and dissimilar metal were observed. The observed tensile properties were correlated with microstructure and hardness distribution across the welds.

关键词： Maraging steel(250) 13-8 Mo stainless steel Mechanical properties Microstructure

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Polarizabilities and Orientational Order Parameter in N-(p-n-Ethoxybenzylidene)- p-n-Alkoxy Anilines, *** LC Compounds

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Journal of surface Engineered Materials and Advanced Technology 2016年第3期6卷 134-148页

作者： Putcha srinivasa sastry Chintalapati srinivas Pokkunuri Pardhasaradhi venkata gopala krishna Murthy Pisipati Department of Physics Krishna University Machilipatnam India Department of Physics A. L. College Vijayawada India Liquid Crystal Research Centre Department of Electronics and Communications Engineering Koneru Lakshmaiah University Vaddeswaram India

n.m, ***, nO.m and *** compounds play an important role in the fundamental and applied aspects. As a part of our systematic studies of the above homologous series regarding the synthesis, characterization and phase transition studies, here the authors report the polarizabilities and orientational order parameter, s in N-(p-n-ethoxybenzylidene)-p-n-alkoxy anilines, *** with m = 3 to 10 liquid crystalline compounds except with m = 5 which has been already published. The rest of the compounds exhibit the nematic LC phase except with m = 10 which shows the smectic-C phase along the nematic phase which is originally not detected by Godzwon et al. But the author’s observations with TM and differential scanning calorimeter have shown the existence on smC phase in addition to nematic phase. Further, smC is clarified using the histogram technique whose details are given below and are published elsewhere. The orientstonal order parameter, s is estimated using different methods and compared with the value obtained from birefringence, δn = (nsub>esub> – nsub>osub>) where no field model is used. It is observed in these compounds case as in other LC compounds vuks isotropic model is favored compared to that of anisotropic model proposed by Neugebauer.

关键词： Orientstonal Order Parameter s 2O.Om LC Compounds vuks Isotropic Model Neugebauer Anisotropic Model Nematic Phase

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