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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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In the field of personal protective clothing, a temperature rating indicates the lowest acceptable air temperature at which an average person would be comfortable when wearing a certain set of clothing. While manufacturers believe that providing temperature ratings is helpful to consumers when they are comparing garments, there have been different methods of testing for a temperature rating. The…
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ASTM International Committee F37 on Light Sport Aircraft is currently at work on a proposed new standard that will aid light sport aircraft manufacturers in understanding the standardization system that governs their products. ASTM WK22124 , Guide for Compliance with Light Sport Airplane Standards, is under the jurisdiction of the F37.20 Airplane subcommittee. According to Thomas Gunnarson, U.S.…
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ASTM International Committee F37 on Light Sport Aircraft will meet March 30 to April 1, 2009, at the Messe Friedrichshafen Exhibition Grounds in Friedrichshafen, Germany, in conjunction with AERO Friedrichshafen 2009. The three days of F37 technical meetings will include discussions on changes to key LSA standards and proposals for new documents. It will also include several other activities,…
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A proposed new ASTM International standard will facilitate more efficient recycling of a variety of post-consumer plastics. The proposed standard, WK20632, Practice for Marking Plastic Products for Identification in Reuse and Recycling, is under the jurisdiction of Subcommittee D20.95 on Recycled Plastics, part of ASTM International Committee D20 on Plastics. ASTM WK20632 is based on an original…
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All interested parties are welcome to join in the standards developing activities of ASTM International Committee D20 on Plastics. Current D20 projects such as the development of proposed new standards covering backed vinyl siding and bioreactor landfill conditions demonstrate the diversity of D20’s work., Backed Vinyl Siding, Subcommittee D20.24 on Plastic Building Products is developing WK18425 , Specification for Rigid Poly (Vinyl Chloride) (PVC) Siding with Foam Plastic Backing (Backed Vinyl Siding). Vinyl siding with an integral foam plastic backing has been commercially available for nearly a decade. Because backed-vinyl siding is a variation of the basic siding product, testing and third party certification for…, Biodegradability of Plastics in Landfill Conditions, A proposed new standard being developed by Subcommittee D20.96 on Environmentally Degradable Plastics and Biobased Products will aid in the determination of degradation and biodegradation of plastics in landfill environments. All interested parties are encouraged to participate in the development of WK18427 , Determining the Aerobic Degradation and Anaerobic Biodegration of Plastic Materials…
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Healthcare workers who inspect radiation protection garments will be the primary users of a proposed new ASTM International standard, WK15823 , Practice for the Fluoroscopic Inspection of Radiation Protection Garments. The proposed practice is being developed by Subcommittee F23.70 on Radiological Hazards, part of ASTM International Committee F23 on Protective Clothing. “Besides visual…
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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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Two proposed new standards currently being developed by ASTM International Committee F23 on Protective Clothing will each contribute to the safety of protective clothing. Interested parties are invited to participate in the development of both proposed standards, which are WK14247 , Specification for Air-Fed Protective Ensembles and WK14442 , Antimicrobial Activity of Textiles Following Multiple…, WK14247, Specification for Air-Fed Protective Ensembles, Subcommittee F23.30 on Chemicals invites users and manufacturers of air-fed protective ensembles to participate in the development of a proposed new standard WK14247 . This proposed specification would establish design, performance, documentation, labeling and certification requirements for protective ensembles that rely on principal air supply to the wearer via an air line or air filtered…, WK14442, Antimicrobial Activity of Textiles Following Launderings with Bleach, Antimicrobial treatments often are applied to textiles to impart durable efficacy, reducing the survival and growth of microorganisms on the textile. A proposed new ASTM standard, WK14442 , under the jurisdiction of F23’s biological subcommittee, F23.40 , would ensure these antimicrobial agents would continue to work throughout a garment’s life span. “Over the last 10 years, the industry has…
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While the polymer-based siding industry developed around the use of polyvinyl chloride, the last two decades have seen the introduction and rise in use of polypropylene as a siding material. Because of this, siding producers and polypropylene suppliers began to discuss the need for an ASTM standard for this type of siding. These discussions have resulted in the development and recent approval of…