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Description of ASTM-C948 2001ASTM C948-81-Reapproved2001Historical Standard: Standard Test Method for Dry and Wet Bulk Density, Water Absorption, and Apparent Porosity of Thin Sections of Glass-Fiber Reinforced ConcreteASTM C948Scope 1.1 This test method covers the determinations of dry and wet bulk density, water absorption, and apparent porosity of thin sections of glass-fiber reinforced concrete. Note 1—This test method does not involve a determination of absolute specific gravity. Therefore, such pore space as may be present in the specimen that is not emptied during the specified drying or is not filled with water during the specified immersion is considered "impermeable" and is not differentiated from the solid portion of the specimen for the calculations, especially those for percent voids. Depending upon the pore size distribution and the pore entry radii of the specimen and on the purposes for which the test results are desired, the procedures of this method may be adequate, or they may be insufficiently rigorous. In the event that it is desired to fill more of the pores than will be filled by immersion, various techniques involving the use of vacuum treatment or increased pressure may be used. If a rigorous measure of total pore space is desired, this can only be obtained by determining absolute specific gravity by first reducing the sample to discrete particles, each of which is sufficiently small so that no impermeable space can exist within any of the particles. <>1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Keywords concrete-glass-fiber reinforced (GFRC); density-concrete; glass fiber reinforced concrete (GFRC); porosity-apparent; water absorption-brick/clay/concrete products; dry and wet bulk density/water absorption/apparent porosity of thin; sections of glass fiber reinforced concrete (GFRC), test ICS Code ICS Number Code 91.100.30 (Concrete and concrete products) DOI: 10.1520/C0948-81R01 This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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