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A new ASTM International practice provides a standard for preparing a mixture of cement paste that will simulate the shearing experienced by the cement paste in concrete. The new standard, ASTM C1738 , Practice for High-Shear Mixing of Hydraulic Cement Pastes, was developed by Subcommittee C01.22 on Workability , part of ASTM International Committee C01 on Cement . According to Chiara Ferraris,…
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ASTM International Committee F41 on Unmanned Maritime Vehicle Systems will meet on Aug. 17, 2011, at the Walter E. Washington Convention Center in Washington, D.C. The meeting will take place in conjunction with the AUVSI Unmanned Systems North American 2011 Conference. The F41 executive subcommittee meeting will begin at 7:00 a.m. on Aug. 17. in room 149A. In addition, all interested parties are…
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A new standard approved by ASTM International Committee B07 on Light Metals and Alloys provides an outline for designers, casting purchasers, casting producers and technical societies on how to do business when purchasing squeeze, thixocast or rheocast parts. The new standard, B969 , Specification for Aluminum-Alloy Castings Produced by the Squeeze Casting, Thixocast and Rheocast Semi-Solid…
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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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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 Committee F41 on Unmanned Undersea Vehicle Systems invites all interested parties to participate in a new task group, F41.90.01 on Unmanned Surface Vehicles. With the addition of this new task group, the name of Committee F41 will be changed to Unmanned Maritime Systems. Task Group F41.90.01 is seeking new members with expertise in unmanned surface vehicles to complement the…
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A strong demand from the aerospace sector has made it challenging for industry to supply heat-treated plate for both aerospace and other applications. To increase heat-treated plate production capacity, ASTM International Committee B07 on Light Metals and Alloys has developed a new standard, B 947 , Practice for Hot Rolling Mill Solution Heat Treatment for Aluminum Alloy Plate. The new standard…
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A proposed new standard currently being developed by ASTM International Committee F01 on Electronics will prove to be useful to the tantalum sputtering target industry. The proposed standard, WK9490, Test Method for Reporting Crystallographic Orientation of Sputtering Target Materials, is under the jurisdiction of Subcommittee F01.17 on Sputter Metallization. "The tantalum sputtering target…
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ASTM International Committee F01 on Electronics is currently developing a proposed new standard that will provide uniformity in the values reported for oxygen content in aluminum alloys used for sputtering targets in the manufacture of integrated circuits. The proposed standard, WK9120, Determination of Oxygen in High Purity Aluminum and Alloys in High Purity Aluminum Base by Inert Gas Fusion…
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After a 35-year-absence, the natural cement industry is being revived and, along with it, a long-withdrawn ASTM International standard. Until it closed in 1970, the Century Cement Company in Rosendale, N.Y. was the last company to manufacture natural cement. Up to that point, Rosendale had been the center of the industry, the source of more than half of all natural cement produced in the U.S.…