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The effective specific gravity of aggregate (Gse) for an HMAC mixture remains constant over a range of asphalt contents. The same should hold true for RAP materials. Gse is calculated as follows: G P G P G se b mm b b 100 100 (1-1) where Gmm = maximum specific gravity of the mixture, Gb = specific gravity of the asphalt cement, and
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Relative density is determined by the bulk specific gravity of the compacted pavement divided by the 75 blow Marshall specific gravity of the corresponding lot. 2. Lot For the purposes of compliance testing, a lot shall be 300 tons of asphalt concrete placed or one day's production, as determined by the Engineer. 3. Coarse Aggregate
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Aggregate Specific Gravity. Aggregate specific gravity is useful in making weight-volume conversions and in calculating the void content in compacted HMA (Roberts et al., 1996 [1] ). AASHTO M 132 and ASTM E 12 define specific gravity as: "…the ratio of the mass of a unit volume of a material at a stated temperature to the mass of the same ...
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Effective specific gravity was determined using equation and equation [26,27,29]. (2) Gse = 100 − P b 100 G mm − P b G b (3) Gmm = 100 P s G se + P b G b where P b is bitumen content, P s is aggregate content, percent by total weight of mixture, G b is bitumen specific gravity, G mm is maximum specific gravity of paving mixture. 3.4.3.3 ...
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Overview. The theoretical maximum specific gravity (Gmm) of a HMA mixture is the specific gravity excluding air voids. Thus, theoretically, if all the air voids were eliminated from an HMA sample, the combined specific gravity of the remaining aggregate and asphalt binder would be the theoretical maximum specific gravity.
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There is no specification for bulk specific gravity, but it is used to calculate other specified parameters such as air voids, VMA and VFA. Typical Values. Typical values for bulk specific gravity range from 2.200 to 2.500 depending upon the bulk specific gravity of the aggregate, the asphalt binder content, and the amount of compaction.
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Aggregate bulk specific gravity may be one of the least appreciated factors affecting the performance of asphalt pavements. Although high quality mixtures can be made with aggregates having a wide range in bulk specific gravity values, precisely determining the bulk specific gravity (Gsb) is critical to setting the optimum asphalt content of every mix design.
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Specific Gravity of Asphalt Several AASHTO and ASTM standards govern the measurement of the specific gravity of asphalt, also known as theoretical maximum specific gravity, or simply the Rice Test. Test methods AASHTO T 209 and ASTM D2041 determine theoretical maximum specific gravity and density values used to calculate air voids in the ...
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BULK SPECIFIC GRAVITY (Gmb) OF COMPACTED HOT MIX ASPHALT (HMA) USING SATURATED SURFACE-DRY SPECIMENS FOP FOR AASHTO T 166 Scope This procedure covers the determination of bulk specific gravity (Gmb) of compacted hot mix asphalt (HMA) using three methods – A, B, and C – in accordance with AASHTO T 166-12.
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Aggregate Bulk (Dry) Specific Gravity (Gsb) of Reclaimed Asphalt Pavement (RAP) and Reclaimed Asphalt Shingles (RAS) Appendix B.21 (continued) Effective: May 1, 2007 Revised: April 12, 2017 April 12, 2017 Manual of Test Procedures for Materials Page B.103 Appendix B.21 g) Calculate the individual Gmm values. The average result will be used in the
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There is no specification for bulk specific gravity, but it is used to calculate other specified parameters such as air voids, VMA and VFA. Typical Values. Typical values for bulk specific gravity range from 2.200 to 2.500 depending upon the bulk specific gravity of the aggregate, the asphalt binder content, and the amount of compaction.
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Asphalt Specific Gravity. Because the specific gravity of asphalt binders change with temperature, specific gravity tests are useful in making volume corrections based on temperature. The specific gravity at 15.6 ° C (60 ° F) is commonly used when buying/selling asphalt cements. A typical specific gravity for asphalt is around 1.03.
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Aggregate Bulk (Dry) Specific Gravity (Gsb) of Reclaimed Asphalt Pavement (RAP) and Reclaimed Asphalt Shingles (RAS) Appendix B.21 (continued) Effective: May 1, 2007 Revised: April 12, 2017 April 12, 2017 Manual of Test Procedures for Materials Page B.103 Appendix B.21 g) Calculate the individual Gmm values. The average result will be used in the
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Continue reading Asphalt Pavement Construction. ... This value is based on the asphalt mixture's maximum specific gravity – also known as the Rice value or G mm in Superpave. The maximum unit weight is determined by multiplying the Rice value by 62.4 pounds per cubic foot (PCF). For example, 2.500 is a typical Rice value. 2.500 X 62.4 = 156 ...
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4.1 The bulk specific gravity (Gsb) of the aggregate in the reclaimed asphalt pavement can be estimated. This estimate is determined by calculating the effective specific gravity (Gse) using maximum specific gravity (Gmm) and binder content (Pb). 4.2 This test method outlines the alternative method for determining Gmm for RAP.
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thickness of pavement tested, instead of permeability, the infiltration rate is calculated to estimate the effectiveness of fog seal on reducing the permeability of pavement. Cores from I-79, I-64 and Route-19 projects were collected and sent to the WVUATL for bulk specific gravity (G ) measurements. According to AASHTO T 166, when the
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