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X-ray diffraction has become a popular means of residual stress measurement in the aerospace materials field over the last 50 years. A proposed new guide being developed by ASTM International Committee E28 on Mechanical Testing will provide the necessary information to obtain the most reliable residual stress values as well as identify and evaluate potential errors in measurement, paving the way…
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Air permits from regulatory agencies, such as the U.S. Environmental Protection Agency (USEPA), often require the measurement of a plume's opacity as the plume is emitted from a stationary point source (for example, smokestacks) in the outdoor ambient environment. While such opacity is often visually measured by human observers as “certified smoke readers,” an opacity measurement method using…
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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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Engineers and researchers who have specialized Charpy testing needs will be the primary users of two new standards recently approved by ASTM International Committee E28 on Mechanical Testing. The new standards, E2248 , Test Method for Impact Testing of Miniaturized Charpy V-Notch Specimens, and E2298 , Test Method for Instrumented Impact Testing of Metallic Materials, were developed by…
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The measurement of acid mist is becoming increasingly important due to recent actions taken by the U.S. Environmental Protection Agency on fine particles (2.5 micrometers in diameter and smaller) that are unhealthy to breathe. ASTM International Committee D22 on Air Quality is currently working on a proposed standard for measuring acid mists that come from combustion sources, WK22846 , Test…
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Working toward a standard practice for torque calibration that would reduce laboratory inconsistencies and uncertainties has led to the approval of a new ASTM International standard, E2428 , Practice for Calibration of Torque-Measuring Instruments for Verifying the Torque Indication of Torque Testing Materials. The new standard was developed by Subcommittee E28.01 on Calibration of Mechanical…
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A new ASTM International standard provides guidance for using data generated by ASTM standards in testing for asbestos in surface dust. ASTM D 7390 , Guide for Evaluating Asbestos in Dust on Surfaces by Comparison Between Two Environments, was approved by ASTM International Committee D22 on Air Quality, part of Subcommittee D22.07 on Sampling and Analysis of Asbestos. According to James Millette…
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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 standards E 10 , Test Method for Brinell Hardness of Metallic Materials, and E 18 , Test Methods for Rockwell Hardness of Metallic Materials, have both recently undergone extensive revisions. Both standards are under the jurisdiction of Subcommittee E28.06 on Indentation Hardness Testing, which is part of ASTM International Committee E28 on Mechanical Testing. “The intention…
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A new ASTM International standard will provide a method to consistently address indoor air quality complaints in residential buildings and to guide IAQ investigations in an efficient manner. The standard, D 7297 , Practice for Evaluating Residential Indoor Air Quality Concerns, is under the jurisdiction of Subcommittee D22.05 on Indoor Air, part of ASTM International Committee D22 on Air Quality…