iosr-JMCE   Volume-18 ~ Issue-2 ~ Mar. – Apr. 2021

Abstract: How spheroidization heat treatments influence on machinability and microstructure of AISI / SAE 1040-1050 steels, under cylindrical turning was investigated, in order to find an optimal tool life as a machinability criterion.
Samples were made in the form of bars of 70 and 60 mm in diameter and 125 mm in length. These were subjected to the treatments: T1 = 900 °C / 3 h / oven cooling; T2 = 750 °C / 3 h / - 650 °C / 6h / oven cooling and T3 = 700 °C / 24 h /oven cooling. The cutting parameters were: S = 67m / min and 78m / min; f = 0.1 mm / rev; d = 1 mm. The treatments were carried out in a muffle furnace. Hardness was measured on the Brinell scale (HB). A parallel lathe was used.......

Keywords: Machinability; Flank wear; Tool life; globular cementite; medium carbon steels

[1]. Harisha S. R., Sathyashankara Sharma1, U. Achutha Kini1 and Gowri Shankar M. C., Study on Spheroidization and Related Heat Treatments of Medium Carbon Alloy Steels. MATEC Web of Conferences 144, 02008 (2018).
[2]. Bhadeshia H:K:D:H: Prog. Mater. Sci. 57(2012) 268–435.
[3]. Krauss G. Steels-Processing, Structure, and Performance, ASM International, Materials Park, OH, 2005, pp. 251-262.
[4]. Heat Treating, ASM International Handbook, 1991, p: 119.
[5]. Lee Y-W., Son Y., Lee S.-J., Microstructure and mechanical properties of spheroidized D6AC steel, Materials Science & Engineering A 585 (2013) 94–99.

Abstract: Frequency dependent impedance response can give insight to the charge transport mechanism of a composite material. Charge transport mechanism is influenced by individual constituent properties and interphase between the constituents. Computational study can be used to predict these behaviors. To conduct computational study of the charge transport on the composite material, these frequency dependent properties were taken into account. A computational FEA model was developed and verified by using experimental data. Composite of study was epoxy-tin material. Computational calculation was conducted by using frequency dependent single phase material properties of the domain representing insulating epoxy and conductive tin..

Keywords: Maxwell's equation, FEA, Dielectric Spectroscopy, Impedance

[1]. Pal, U. B., Woolley, D. E. & Kenney, G. B. Emerging SOM technology for the green synthesis of metals from oxides. Jom 53, 32–35 (2001).
[2]. Takamura, H., Ogawa, M., Suehiro, K., Takahashi, H. & Okada, M. Fabrication and characteristics of planar-type methane reformer using ceria-based oxygen permeable membrane. Solid State Ionics 179, 1354–1359 (2008).
[3]. O'hayre, R., Cha, S.-W., Colella, W. & Prinz, F. B. Fuel cell fundamentals. (John Wiley & Sons, 2016).
[4]. Yang, C., Coffin, A. & Chen, F. High temperature solid oxide electrolysis cell employing porous structured (La0.75Sr0.25)0.95MnO3 with enhanced oxygen electrode performance. Int. J. Hydrogen Energy 35, 3221–3226 (2010).
[5]. Kremer, F. & Schönhals, A. Broadband dielectric spectroscopy. (Springer Science & Business Media, 2002).

Abstract: The thesis's objective is to study the behavior of shear strength of reinforced concrete with basalt fiber added to the mix. In this thesis fiber and stirrups ratio were variables. Nine beams were casted with basalt fiber ratios (0%, 0.25%, and 0.5%) from the volume of concrete, and stirrups were 5Ф8/m, 7Ф8/m, and 10Ф8/m respectively. All specimens were tested under two-point concentrated load to determine the maximum load capacity of beams. The objective of research is to study the load deflection behavior of tested specimens, crack pattern, crack loads, failure loads, stiffness, ductility, and energy absorption. Experimental study showed that basalt fiber has a good effect on concrete mechanical properties such as ductility, energy absorption, and stiffness. It also decreased the number of cracks and delayed the appearance of cracks. From the study, it is noted that basalt fiber improved the behavior of specimens and changes it from brittle to ductile.

[1]. Deák T, Czigány T. Chemical composition and mechanical properties of basalt and glass fibres: a comparison. Text Res J (2009);79(7):645–51.
[2]. Singha, K., A short review on basalt fiber. Int. J. Textile Sci.,(2012) 1: 19-28.
[3]. Sun, Xinjian, et al. "Mechanical Properties Tests and Multiscale Numerical Simulations for Basalt Fiber Reinforced Concrete." Construction and Building Materials, vol. 202, 2019, pp. 58–72., doi:10.1016/j.conbuildmat.2019.01.018.
[4]. Elshekh, A.e.a., et al. "Evaluation the Effectiveness of Chopped Basalt Fiber on the Properties of High Strength Concrete." Journal of Applied Sciences, vol. 14, no. 10, Jan. 2014, pp. 1073–1077., doi:10.3923/jas.2014.1073.1077.
[5]. Krassowska, Julita, and Andrzej Lapko. "The Influence of Steel and Basalt Fibers on the Shear and Flexural Capacity of Reinforced Concrete Beams." Journal of Civil Engineering and Architecture, vol. 7, no. 7, 2013, pp. 789–795., doi:10.17265/1934-7359/2013.07.002.

Abstract: Aggregate (RCA) has been increased in few years by researchers. The main reasons behind these changing trends are the demand and availability of NCA and the environmental effects of concrete and construction waste. The reason for research was to consider the impact of RCA on new and solidified properties of concrete. Usefulness is the specific new property, compressive strength and tractable, modulus of elasticityand flexural strength, are the specific solidified properties of concrete, on which this exploration work is based. Various kinds of concrete combinations were additionally set up by utilizing different rates of RCA instead of NCA. Functionality of concrete mixes was additionally tried by utilizing the droop cone test. Solid shapes for (compressive strength tests), chambers for (compressive strength tests and parting elasticity tests) and shafts for (flexural strength tests) were additionally....

Key Words: concrete ,recycled aggregate ,admixtures,compressive strength tests ,parting elasticity tests) flexural strength tests.

[1]. J. Kalyana Chandrasekhar Reddy, P. S. S. AnjaneyaBabu. Significance of Silica Fume on the Mechanical Properties of Recycled Aggregate Concrete. International Journal ofScience and Research (IJSR), ISSN (Online): 2319-7064. 2015.
[2]. Suraya Hani Adnan, Lee Yee Loon, Ismail Abdul Rahman, HamidahMohd Saman, and Mia WimalaSoejoso. Compressive Strength of Recycled Aggregate Concrete with Various Percentage of Recycled Aggregate FakultiKejuruteraanAwamdanAlamSekitar-UniversitiTun Hussein Onn Malaysia (UTHM)-2008.
[3]. Fathei Ramadan salehlamein, Mochamad. Solikin, Ir.sriSunarjono. Effect of Recycled Coarse Aggregate on Concrete Properties. Post Graduate Civil EngineeringPrograms Universities, Indonesia, Higher polytechnics institute, BaniWaleed, Libya. 2015.
[4]. P.K. Mehta and P.J.M. Monteiro. (1993), Concrete, Structure, Properties and Materials, Prentice Hall, New York.
[5]. De Vries, P. Concrete recycled: crushed concrete aggregate. In: Proc. of the International Conference: Concrete in the Service ofMankind. I. Concrete for Environment Enhancement and Pro-tection, Dundee, Scotland; 1996. p. 121–30.

Abstract: The advancement of Self Squeezing Concrete is reformist achievement all through the whole presence of improvement industry achieving extraordinary use of SCC by and large nowadays. It has various advantages over run of the mill concrete in regards to redesign in effectiveness, decline in labor and as a rule cost, staggering finished thing with splendid mechanical response and toughness. Joining of rice husk further improves its properties. In this way the reason for the current investigation is to make a review of new properties of self-joining concrete, created utilizing rice husk. This evaluation explores the new properties of self-compacting concrete by utilizing rice husk debris as a strong substitution. The explanation behind this assessment is to survey the genuine properties of self-compacting concrete by using 0%, 4%, 8%, 12%, 16%, 20% climb husk flotsam and.......

Key Words: Rice Husk ash, fresh properties, admixtures, Recycled Aggregate , Self-Compacting Concrete properties..

[1]. Bertil Persson, "A comparison between mechanical properties of self and the corresponding properties of normal concrete" Cement and Concrete Research, 31, 2001, pp 193-198.
[2]. Nan Su, Kung-Chung Hsu and His Wen Chai "A simple mix design method for self-compacting-concrete" Cement and ConcreteResearch, 31, 2001, pp 1799 – 1807
[3]. N. Bouzoubaa and M. Lachemi, "Self-compacting concrete incorporating high volumes of class F fly ash Preliminary results" Cement and Concrete Research, 31, 2001, pp 413 – 420
[4]. Dr. R. Sri Ravindrarajah, D. Siladyi and B. Adamopoulos, "Development of High strength Self-Compacting Concrete with reduced Segregation Potential" 1 Vol., 1048 pp., ISBN: 2-912143-42-X, soft covers.
[5]. Hajime okamura, Masahiro ouchi, "Self-Compacting Concrete" Journal of Advanced Concrete Technology, volume 1, 2003, pp 5-15

Abstract: CFRP is a polymer matrix and embedded in this matrix are amalgamated aligned continuous organic fibers that have copious usages or applications. These advances have brought in carbon fiber reinforced plastics (CFRP) which have the solutions to the challenges been faced with steel anchor tendons. The analysis will be carried out to obtain numerical predictions of a new anchor system made of CFRP material. Numerical simulations will be performed using proposed models from the MIDAS GTS NX program. The numerical modeling results were compared to the experimental results. The main work is summarized as below: The anchor will be subjected to pull-out load through numerical simulation to determine the strength and reliability of the news anchor.......

[1]. Littlejohn, G., Ground Anchorages: Corrosion Performance. Proceedings of the Institution of Civil Engineers, 1987. 82(3): p. 645-662.
[2]. Kim, N.-K., Performance of Tension and Compression Anchors in Weathered Soil. Journal of Geotechnical and Geoenvironmental Engineering, 2003. 129(12): p. 1138-1150.
[3]. Xanthakos, P.P., Ground Anchors and Anchored Structures. 1991: Wiley.
[4]. Kim, N.-K., J.-S. Park, and S.-K. Kim, Numerical simulation of ground anchors. Computers and Geotechnics, 2007. 34(6): p. 498-507.
[5]. Seo, H., et al., Mechanical Behavior of Hybrid Soil Nail-Anchor System. KSCE Journal of Civil Engineering, 2019. 23(10): p. 4201-4211.

Abstract: The resistance value of the conductive cement-based composite were measured using the two-electrode method to study the effect of different graphene nano-platelets (GNPs) content on the resistivity of cement mortar specimen. The test results show that in 3d and 7d graphene has no significant effect on the electrical conductivity of cement mortar, while the addition of graphene in the late hydration (14d, 28d) Has a significant effect on improving the conductivity of cement mortar, and it tends to increase first and then decrease with the increase of graphene content.

Keywords: Graphene nano-platelets; cement mortar; electrical resistivity

[1]. Lameiras R, Barros JAO, Azenha M, Influence of casting condition on the anisotropy of the fracture properties of steel fiber reinforced self-compacting concrete (SFRSCC) [J]. Cem. Concr. Compos., 2015, 59:60
[2]. Deyu KD, Corr DJ, Hou P, et al. Influence of colloidal silica sol on fresh properties of cement paste as nano-silica powder with agglomerates in micron-scale [J]. Cem. Concr. Compos., 2015, 63:30
[3]. Ghatefar A, EI-Salakawy E, Bassuoni M T. Early-age restrained shrinkage cracking of GFRP-RC bridge desk slabs: Effect of environmental conditions [J]. Cem. Concr. Compos., 2015, 64:62
[4]. Jiang Linhua, Bai Shuya, Jin Ming, et al. Study on the electrical conductivity of graphene cement-based composite materials [J]. Journal of Harbin Engineering University, doi: 10.11990 / jheu.201610043.
[5]. D.D.L. Chung, Piezoresistive cement-based materials for strain sensing, J. Intell. Mater. Syst. Struct. 13 (9) (2002) 599–609..