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Description of ASTM-D6995 2013ASTM D6995 - 05(2013)Standard Test Method for Determining Field VMA based on the Maximum Specific Gravity of the Mix (G mm )Active Standard ASTM D6995 | Developed by Subcommittee: D04.21 Book of Standards Volume: 04.03 ASTM D6995Significance and Use 4.1 Various users desire indication of compliance with VMA specifications for hot mix asphalt (HMA) during production. 4.2 The standard practice for determining VMA requires that the bulk specific gravity of the aggregate components be determined. This is a very time consuming test, which is not suitable for routine QC procedures. 4.3 When an aggregate source used in the mix has a highly variable bulk specific gravity and a reference average bulk specific gravity (G sb ) (for example, as established in the mix design) is used to calculate VMA during HMA production, erroneous values may occur. 4.4 The test for maximum specific gravity of the mix (G mm ) is a routine QC test at HMA plants. The effective specific gravity of the aggregate components (G se ) can be easily calculated from this test. However the G se does not take into account the amount of asphalt absorbed, which is required for accurate VMA determination. This method provides a means to correct the G se to account for the average absorbed asphalt. This procedure should not be used if the percent water absorption of the total (combined) aggregates varies between four tests, randomly obtained over a 30 day period, by more than 0.4?%. 1. Scope 1.1 This test method is intended to be used for a rapid field determination of voids in mineral aggregate (VMA) of hot mix asphalt (HMA). It provides equations for calculating the VMA based on the asphalt content of the mix and its maximum specific gravity (G mm ). It is intended that this should be used for the rapid field determination of VMA during Quality Control (QC) operations at HMA plants, particularly where the specific gravity of the aggregate is highly variable. 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.
ASTM Standards C127 Test Method for Density, Relative Density (Specific Gravity), and Absorption of Coarse Aggregate C128 Test Method for Density, Relative Density (Specific Gravity), and Absorption of Fine Aggregate D70 Test Method for Density of Semi-Solid Bituminous Materials (Pycnometer Method) D854 Test Methods for Specific Gravity of Soil Solids by Water Pycnometer D2041 Test Method for Theoretical Maximum Specific Gravity and Density of Bituminous Paving Mixtures D2172 Test Methods for Quantitative Extraction of Bitumen From Bituminous Paving Mixtures D2726 Test Method for Bulk Specific Gravity and Density of Non-Absorptive Compacted Bituminous Mixtures D6307 Test Method for Asphalt Content of Hot-Mix Asphalt by Ignition Method Keywords HMA; Field VMA; QC; ICS Code ICS Number Code 93.080.20 (Road construction materials) DOI: 10.1520/D6995 ASTM International is a member of CrossRef. ASTM D6995This 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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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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