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Rapid hardening hydraulic cements are used in a variety of applications in which reduced cementitious contents are desired or early service is needed. Included among these applications are paving, construction, stucco, mortar and block. A newly approved ASTM International standard covering these cements, ASTM C1600/C1600M , Specification for Rapid Hardening Hydraulic Cement, has been developed by…, Type URH, —ultra rapid hardening, for use where ultra high early strength is desired;, Type VRH, —very rapid hardening, for use where very high early strength is desired;, Type MRH, —medium rapid hardening, for use where mid-range rapid hardening, high early strength is desired; and, Type GRH, —general rapid hardening, for use when the higher strength properties of Type VRH or a Type MRH cement is not required. “ASTM C1600 lists minimum requirements for compressive strength, setting time, shrinkage and soundness (autoclave expansion),” says Hicks. “Optional specifications for sulfate expansion, alkali silicate reactions with aggregates, heat of hydration and expansion in water are also…
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Flow characteristics of fine metal powders are important in filling dies for pressing of powder metallurgy compacts, which are later sintered and sometimes machined into finished parts. The flow rate, as measured by a new ASTM standard, determines the flow necessary for a precise quantity of powder to be introduced into the die. The new standard, B964 , Test Methods for Flow Rate of Metal Powders…
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Two recently approved ASTM International standards provide user-friendly tests for properties of sintered metallurgy products. The new standards, developed by Subcommittee B09.04 on Bearings, are ASTM B962 , Test Methods for Density of Compacted or Sintered Power Metallurgy (PM) Products Using Archimedes’ Principle, and ASTM B963 , Test Methods for Oil Content, Oil-Impregnation Efficiency and…
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All interested parties, particularly end users from the forensics sciences, are encouraged to join in the development of a proposed new ASTM standard, WK18814 , Guide for Relative Intensity Correction of Raman Spectrometers. WK18814 is being developed by Subcommittee E13.08 on Raman Spectroscopy, which is under the jurisdiction of ASTM International Committee E13 on Molecular Spectroscopy and…
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Since the early 1980s, multivariate analytical techniques have been increasingly used in a variety of industries. A new ASTM International standard, E2617 , Practice for Validation of Empirically Derived Multivariate Calibrations, answers a need for standards for these techniques. Subcommittee E13.11 on Multivariate Analysis, under the jurisdiction of ASTM International Committee E13 on Molecular…
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A recently approved revision to ASTM International standard C 150 , Specification for Portland Cement, includes three significant technical changes to the document. The changes are part of a joint effort between ASTM and the American Association of State and Highway and Transportation Officials to harmonize C 150 with AASHTO’s standard, M 85, Specification for Portland Cement. C 150 is under the…
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ASTM International’s Committee E13 on Molecular Spectroscopy and Separation Science will hold its February meeting in conjunction with the 58th Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy (Pittcon 2007) from Feb. 25-27 at the McCormick Place Convention Center in Chicago, Ill. All E13 meetings will be held in room N-129. During the conference and exhibit portion of…
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A proposed new standard being developed by ASTM International Committee B09 on Metal Powders and Metal Powder Products offers a solution to the challenge of handling and characterizing very fine powders. Subcommittee B09.02 on Base Metal Powders is developing the proposed standard, WK13023 , Test Method for Determination of Tap Density of Metallic Powders by a Constant Volume Measuring Method. …
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According to Jerry Workman, chair of new ASTM International Subcommittee E13.16 on Chemical Sensors, one place to begin to understand the current and future importance of chemical sensors is the classic television show, Star Trek. “Mr. Spock, the science officer on the Starship Enterprise, routinely used his Tricorder to make measurements of atmospheric gases, soil samples, living tissue and…
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Conventionally processed powder metallurgy materials often exhibit open microporosity at the surface. While it is a natural part of the process, this microporosity can affect the measurement of surface finishes. To cover this and other issues that arise from measuring the surface finish of powder metallurgy, ASTM International Committee B09 on Metal Powders and Metal Powder Products has developed…