1,881,353 research outputs found
A Reactive aggregate undetected by ASTM tests
No full textIn the course of a Canadian investigation, a dolomitic limestone coarse aggregate has been found that produces excessive expansion and cracking in concrete. Despite the observed influence of cement alkalis, the results of the ASTM Test Method C289 on the limestone were negative. The results of the ASTM mortar bar test were also negative but indicated some alkali-reactivity in the limestone. This brief paper is intended to provide for the benefit of those concerned with the use of the standard tests for alkali- aggregate reaction a record of this Canadian experience with an apparently unusual case of cement-aggregate reaction for which the standard tests were not effective.Lors d?une enqu\ueate canadienne, on a d\ue9couvert un agr\ue9gat grossier de calcaire dolomitique, qui provoque dans le b\ue9ton une dilatation et une fissuration excessives. En d\ue9pit de l?influence observ\ue9e des alcalis du ciment, les r\ue9sultats de la m\ue9thode d?essai ASTM C289 appliqu\ue9e au calcaire ont \ue9t\ue9 n\ue9gatifs. Les r\ue9sultats de l?essai ASTM de la barre morti\ue8re ont \ue9t\ue9 \ue9galement n\ue9gatifs mais ont n\ue9anmoins indiqu\ue9 une certaine alcali-r\ue9action dans le calcaire. Ce bref document est cens\ue9 fournir, pour le b\ue9n\ue9fice des intervenants qu?int\ue9resse l?utilisation des essais normalis\ue9s de l?alcali-r\ue9action des granulats, un compte-rendu de cette exp\ue9rience canadienne ayant g\ue9n\ue9r\ue9 une occurrence apparemment inhabituelle de r\ue9action ciment-granulat, pour laquelle les essais normalis\ue9s se sont r\ue9v\ue9l\ue9s inefficaces.Peer reviewed: NoNRC publication: Ye
Wear Measuring and Wear Modelling Based on Archard, ASTM, and Neural Network Models
No full textThe wear measuring and wear modelling are a fundamental issue in the industrial field, mainly correlated to the economy and safety. Therefore, there is a need to study the wear measurements and wear estimation. Pin-on-disc test is the most common test which is used to study the wear behaviour. In this paper, the pin-on-disc (AEROTECH UNIDEX 11) is used for the investigation of the effects of normal load and hardness of material on the wear under dry and sliding conditions. In the pin-on-disc rig, two specimens were used; one, a pin which is made of steel with a tip, is positioned perpendicular to the disc, where the disc is made of aluminum. The pin wear and disc wear were measured by using the following instruments: The Talysurf instrument, a digital microscope, and the alicona instrument; where the Talysurf profilometer was used to measure the pin/disc wear scar depth, a digital microscope was used to measure the diameter and width of wear scar, and the alicona was used to measure the pin wear and disc wear. After that, the Archard model, American Society for Testing and Materials model (ASTM), and neural network model were used for pin/disc wear modelling. Simulation results are implemented by using the Matlab program. This paper focuses on how the alicona can be considered as a powerful tool for wear measurements and how the neural network is an effective algorithm for wear estimation
Fatigue and fracture testing of weldments /
No full text"ASTM publications code number (PCN) 04-010580-30"--T.p. verso.Papers from a symposium held 25 April 1988, Sparks, Nev.; sponsored by ASTM Committees E-9 on Fatique and E-24 on Fracture Testing.Includes bibliographical references and indexes
A Simple Green Method For Biodiesel Iodine Number Determination
No full textA simple and green method for the determination of the iodine number in biodiesel is proposed based on the Friedmann procedure for oils and fats adapted for biodiesel. The reagent solutions used are prepared in water with the exception of the standard iodine and the biodiesel solutions that are dissolved in ethanol 96 %. The method was compared with the procedure recommended by the norm EN 14111, which is essentially the Wijs method. Biodiesel derived from several oils and fats were analyzed using the two methods. A statistical comparison between them shows that both offer equivalent results and precision. Copyright © 2010 by ASTM International,.1477146156Shay, E.G., Diesel fuel from vegetable oils: Status and opportunities (1993) Biomass Bioenergy, 4, pp. 227-242Rinaldi, R., Garcia, C., Marciniuk, L.L., Rossi, A.V., Schuchardt, U., "Síntese de Biodiesel: Uma Proposta Contextualizada de Experimento para Laboratório de Química Geral (2007) Quim. Nova, 30, pp. 1374-1380Ma, F., Hanna, M., Biodiesel Prodution: A review (1999) Bioresour. Technol, 70, pp. 1-15Demirbas, A., Relationships derived from physical properties of vegetable oil and biodiesel fuels (2008) Fuel, 87, pp. 1743-1748Ramos, J.R., Fernández, C.M., Casas, A., Rodríguez, L., Pérez, Á., Influence of fatty acid composition of raw materials on biodiesel properties (2009) Bioresour. Technol, 100, pp. 261-268Encinar, J.M., González, J.F., Rodrigues-Reinares, A., Ethanolysis of used frying oil. biodiesel preparation and characterization (2007) Fuel Process. Technol, 88, pp. 513-522Schuchardt, U., Sercheli, R., Vargas, R.M.J., Transesterification of vegetable oils: A review (1998) J. Braz. Chem. Soc., 9, pp. 199-210Knothe, G., Analyzing biodiesel: S tandards and other methods (2006) J. Am. Oil Chem. Soc, 83, pp. 823-833Knothe, G., Structure indices in FA chemistry. How relevant is the iodine value? (2002) J. Am. Oil Chem. Soc, 79, pp. 847-854Mittelbach, M., Diesel fuel derived from vegetable oils. VI: Specifications and quality control of biodiesel (1996) Bioresour. Technol, 56, pp. 7-11Standard test method for iodine value of drying oils and fatty acids Annual Book of ASTM Standards, pp. 277-279. , ASTM D1959-85, Vol. 06.03, ASTM International, West Conshohocken, PA, 1985Standard test method for iodine value of drying oils and their derivatives (1986) Annual Book of ASTM Standards, pp. 210-212. , ASTM D1541-86, Vol. 06.03, ASTM International, West Conshohocken, PABouaid, A., Martinez, M., Aracil, J., Production of biodiesel from bioethanol and brassica carinata oil: Oxidation stability study (2009) Bioresour. Technol, 100, pp. 2234-2239Knothe, G., Dependence of biodiesel fuel properties on the structure of fatty acid alkyl esters (2005) Fuel Process. Technol, 86, pp. 1059-1070Knothe, G., Some aspects of biodiesel oxidative stability (2007) Fuel Process. Technol, 88, pp. 669-677Xin, J., Imahara, H., Saka, S., Oxidation Stability of Biodiesel Fuel as Pre-pared by Supercritical Methanol (2008) Fuel, 87, pp. 1807-1813Bouaid, A., Martinez, M., Aracil, J., Long storage stability of biodiesel from vegetable and used frying oils (2007) Fuel, 86, pp. 2596-2602Naz, S., Sheikh, H., Saddiqi, R., Sayeed, S.A., Oxidative stability of olive, corn and soybean oil under different condition (2004) Food Chem., 88, pp. 253-259Kodali, D.R., High performance ester lubricants from natural oils (2002) Ind. Lubr. Tribol, 54, pp. 165-170Imahara, H., Minami, E., Saka, S., Thermodynamic study on cloud point of biodiesel with its fatty acid composition (2006) Fuel, 85, pp. 1666-1670AOCS official method cd 1-25. iodine value of fats and oils wijs method (1998) Official Methods and Recommended Practices of the American Oils Chemists' Society, , AOCS, 5th ed., D. Firestone, Ed., AOCS, Champaign, ILFat and Oil Derivatives-Fatty Acid Methyl Esters (FAME)Determination of Iodine Value, , EN 14111, 2003, " European Committee for Standardization, BerlinMargosches, V.B.M., Hinner, W., Friedmann, L., Über eine Schnellmethode zur Bestimmung der Jodzahl fetter Öle mit Jod und Alkohol (1924) Angew. Chem., 37, pp. 334-337(1996) An Encyclopedia of Chemical, Drugs and Biological, pp. 860-861. , The Merck Index, 12th ed., S. Budavari, Ed., Merck Reserch Laboratories, Whitehouse Station, NJEckschlager, K., (1972) Errors, Measurement and Results in Chemical Analysis, pp. 109-120. , Van Nostrand Reinhold Company, Londo
Impact of heat treatment on HSS cutting tool (ASTM A600) and its behaviour during machining of mild steel (ASTM A36)
Get PDFCarburization is one the best heat treatment that responded well to hardening with Palm Kernel Shell giving the
best hardness value. This work studied the influence of carburization on HSStool(ASTM A600) and its behaviour during
machining of mild steel (ASTM A36). Composition of the samples (12 pieces of 180 x 12 x12 mm) HSS tools were
checked using UV-VIS spectrometer and the tools were carburized with PKS at holding temperatures and time of 800,
850, 900,950 oC and 60,90 120 minutes using muffle furnance. The micro structural analysis, surface and core hardnessof
the treated samples gave better results than the untreated samples when checked withsoft driven and optical microscope.
It wasalso observed that increase in the feed rate and depth for length of cut of 50 mm significantly reduces the wear
progression and thereby gave best machining time at maximum carburizing temperature and time(950 oC / 120 minutes)
when it was used to cut mild steelon the lathe machine
ASTM Masonry Standards for The Building Industry, 7th edition
No full textBuku kompilasi in disponsori ASTM International Committee C12. Berisi spesifikasi produk seperti baja beton, bangunan bata, tanah liat, paving bata, bata mengkilat, dll
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