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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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Quality of materials and proper installation are keys to maintaining the effectiveness, safety and durability of radiant barrier systems used for thermal insulation. Two new ASTM standards will provide important information to both users and installers of radiant barrier systems. The new standards are ASTM C1743 , Practice for Installation and Use of Radiant Barrier Systems (RBS) in Residential…
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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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ASTM International Committee C16 on Thermal Insulation will hold a forum on “Thermal Insulation in 2008: Perspectives on Economic Thickness, Contributions to Sustainability, and Design of Power & Process Facilities” on Monday, April 7, 2008, from 5 to 6 p.m., in Anaheim, Calif. The forum will be held in conjunction with the April 6-9 standards development meetings of the committee. Three…
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Work is continuing on a proposed new ASTM International standard that will aid laboratories and materials manufacturers in testing the moisture properties in construction materials. The proposed standard, WK16466 , Test Method for Moisture Retention Curves of Porous Building Materials Using Pressure Plates, is under the jurisdiction of Subcommittee C16.33 on Insulation Finishes and Moisture, part…
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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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A new ASTM International standard, C 1639 , Specification for Fabrication of Cellular Glass Pipe and Tubing Insulation, covers techniques for fabricating cellular glass blocks into billets that are then used to make pipe and tubing insulation. The standard, which was developed by Subcommittee C16.40 on Insulation Systems, part of ASTM International Committee C16 on Thermal Insulation, will be…
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Andrea Russell, sustainability manager, Rio Tinto Minerals, will speak on "The Basics of Life Cycle Assessment and Insulation" on April 16, 2007, in conjunction with the meetings of ASTM International Committee C16 on Thermal Insulation during the April Committee Week in Norfolk, Va. Russell's presentation, which will take place from 6:00 to 7:00 p.m. at the Waterside Convention Center, is part…
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A new ASTM International task group has been formed to develop a proposed new specification for aerogel blanket insulation. The task group, which is under the jurisdiction of Subcommittee C16.23 on Blanket and Loose Fill Insulation, will meet Oct. 22-25, in Atlanta to continue writing the new standard. Subcommittee C16.23 is part of ASTM International Committee C16 on Thermal Insulation. The…
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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.…