Sep 11, 2018 laboratory test procedure for determining bulk specific gravity of superpave gyratory compacted specimens. Determining the optimum asphalt binder content of an opengraded friction. Determination of the specific gravity of micro quantities of bituminous. Dec 22, 2016 laboratory test procedure for determining bulk specific gravity of superpave gyratory compacted specimens. The basic specific gravity always uses the green volume. To determine the specific gravity of given bituminous material. The asphalt absorption can be found knowing the bulk impregnated specific gravity of the mixture, the bulk specific gravity of the. Volume measurement includes the volume of the aggregate particle plus the void volume that becomes filled with water during the test soak period minus the volume of the voids that absorb asphalt. The bottle is kept in water for cooling at 27c for at least half an hour.
Specific gravity is the ratio of the weight of a given volume of aggregate to the weight of an equal volume of water. Standard test method for theoretical maximum specific. Khatri the rice method astm d2041 is used for determining the theoretical maximum specific gravity of asphalt paving mixtures, which is one of the main test parameters used for mix design and. This procedure covers the determination of bulk specific gravity g mb of compacted asphalt mixtures using three methods a, b, and c in accordance with aashto t 16616. Coarse aggregate specific gravity pavement interactive. Astmspecific gravity and absorption of aggregate by. Optimum asphalt content is the content determined by taking into consideration the maximum specimen specific gravity and void requirements. October 2012 theoretical maximum specific gravity gmm and density of hot mix asphalt hma paving mixtures fop for aashto t 209 scope this procedure covers the determination of the maximum specific gravity gmm of uncompacted hot mix asphalt hma paving mixtures in accordance with aashto t 20912. The resulted voids in mineral aggregates vma and voids filled with asphalt vfa were estimated.
Percentages by weight of aggregates, 1,2,n g1,g2,gn. Gb specific gravity of the asphalt binder, and gmb bulk specific gravity of the mixture assumed to represent zero air voids. The standard test methods used for the determination of specific gravity of coarse aggregate are described in aashto t 85 and astm c127. Chapter 2 design and control of bituminous mixtures using a. A typical specific gravity for asphalt is around 1. Standard test method for bulk specific gravity and density of. Specific gravity specific gravity of bitumen the specific gravity of semisolid bituminous material, asphalt cements, and soft tar pitches shall be expressed as the ratio of the mass of a given volume of the material at 25 c to that of an equal volume of water at the same temperature. This computed optimum asphalt content may be modified by such specific requirements as climate, traffic density, absorptive aggregate, friction number. Jul 21, 2014 specific gravity is defined as the ratio of the mass of a given volume of the bituminous material to the mass of an equal volume of water, the temperature of both being specified as 27 0 c. If the air void content of the blend is zero, then its specific gravity is just the theoretical maximum air. A typical specific gravity for asphalt binder is around 1. After determination of gse in this manner, gmm is deter mined at other asphalt contents in the mix design by gmm 100ps. Pdf an alternative approach for the determination of bulk specific. It is a function of the ratio of asphalt to water absorption, which varies widely but follows a definite pattern with different types of aggregates.
Astm d6752 d6752m18, standard test method for bulk specific gravity and density of compacted asphalt mixtures using automatic vacuum sealing method, astm international, west conshohocken, pa, 2018. Standard test method for theoretical maximum specific gravity. Ct 309 october 1, 2010 pdf method of test for theoretical maximum specific gravity and density of hot mix asphalt. Method a measures the bulk specific gravity using paraffin coated briquettes and is used for. Calculate the bulk specific gravity of the aggregate combination in the paving mixture.
Viscosity of asphalt rubber by rotational dipnread viscometer. Specific gravity of bitumen the specific gravity of semisolid bituminous material, asphalt cements, and soft tar pitches shall be expressed as the ratio of the mass of a given volume of the material at 25 c to that of an equal volume of water at the same temperature. Because the specific gravity of binders change with temperature, specific gravity tests are useful in making volume corrections based on temperature. Effect of changing theoretical maximum specific gravity on asphalt. Determine the specific gravity of the asphalt cement. Improved rice method for determining theoretical maximum specific gravity of asphalt paving mixtures prithvi s. Bulk specific gravity also known as bulk dry specific gravity. Method of test for determining bulk specific gravity and density of bituminous mixture. Asphalt binder pg tests federal highway administration. Obtain the specific gravity of the extracted asphalt and calculate the specific gravity of the combined aggregate in the reclaimed material.
This involves the calculation of bulk specific gravity of aggregate blends and the bulk and maximum specific gravity of the mix. Because the specific gravity of asphalt binders change with temperature, specific gravity tests are useful in making volume corrections based on temperature. Laboratory test procedure for determining bulk specific gravity of superpave gyratory compacted specimens. The bottle is filled with freshly boiled and then cooled distilled water. Because the specific gravity of asphalt binders changes with temperature, this test is useful in making volume corrections based on temperature. Hma volumetric terms bulk specific gravity gmb of compacted hma maximum specific gravity gmm air voids or voids total mix va effective specific gravity of aggregate gse voids in mineral aggregate, vma voids filled with asphalt, vfa. Gse effective specific gravity of combined aggregates. Improved rice method for determining theoretical maximum. California test methods version selection caltrans. Apparatus specific gravity bottle of 50 ml capacity, ordinary capillary type with 6 mm diameter neck or wide mouthed capillary type bottle with 25 mm. The optimum asphalt content oac of each mix was obtained at av of 4% as per superpave procedure. The residual asphalt is the glue that remains on the roadway after the cutter or water has evaporated out of the binder. This procedure covers the determination of the maximum specific gravity g.
Determining density of compacted mituminous mixtures. How to calculate the weight of asphalt used for paving the. Quantitative determination of asphalt content from asphalt paving mixtures by the ignition method. Specific gravity being a fundamental property of a bitumen. Difference between asphalt and bitumen comparison between them duration. T 335 pdf 266 kb fop for aashto for determining the percentage of fracture in coarse aggregate. Fluid specific gravity pressure temperature acetic acidglacial 1. Theoretical maximum specific gravity of bituminous mixtures.
For this reason, new tests to determine specific properties, composition and behavior of an asphalt are essential and imperative for its scientific application. T 331 pdf 342 kb bulk specific gravity and density of compacted hot mix asphalt using automatic vacuum sealing method. This list contains the bulk specific gravity, surface saturated dry gravity, and absorption values for use in the 2019 construction season. An alternative approach for the determination of bulk specific gravity and permeability of hot mix asphalt hma. Mar 05, 2019 it can be derived by calculating the volume from the construction area and thickness of the asphalt pavement and multiplying the specific gravity of the asphalt used for pavement. Use this test method to determine the theoretical maximum specific gravity commonly referred to as rice gravity of a bituminous mixture. T 355 pdf 566 kb inplace density of asphalt mixtures using the nuclear moisturedensity gauge.
Effective specific gravity lies between apparent and bulk specific gravity. This list represents the bulk specific gravity values to be used in all asphalt concrete jmf and well graded concrete jmf submittials. Exp 9 specific gravity of bitumen civil engineers pk. In the example in figure 31, the bulk specific gravity includes all the pores, the apparent specific gravity does not include any of the pores that would fill with water during a soaking, and the effective specific gravity excludes only those pores that would absorb asphalt. The clean, dried weight of the specific gravity bottle along with stopper is taken and noted as ag. State materials office florida department of transportation. Aashto t308 determining the asphalt content of hot mix asphalt hma by ignition method aashto t209 theoretical maximum specific gravity and density of bituminous paving mixtures aashto t166 bulk specific gravity of compacted bituminous mixtures using saturated surface dry specimens. The ratio of the weight in air of a unit volume of aggregate at a stated temperature to the weight in air of an equal volume of gasfree distilled water at the stated temperature. Also, the appropriate methods for measuring specific gravity are contained in the institute manual.
One limitation of this method, however, is the possible difficulty of removing air bubbles entrapped in the asphalt cement when both coarse and fine aggregates are added to molten asphalt. Density specific gravity an overview sciencedirect topics. Scope this test provides three methods for determining the bulk specific gravity and density of compacted hot mix asphalt hma. Bulk specific gravity an overview sciencedirect topics. Theoretical maximum specific gravity of a bituminous paving mixture gmm, rice test, percent air voids, optimum asphalt content.
This procedure covers the determination of bulk specific gravity g mb of compacted asphalt. This procedure covers the determination of the maximum specific gravity gmm of. Since the specific gravity of asphalt is very close to 1. In this paperwork it is described the design mix of sma composed with relatively high specific weight and their impacts on asphalt mix. Asphalt waqtc fop aashto t 209 19 theoretical maximum specific gravity g mm and density of asphalt mixtures fop for aashto t 209. Measurement of water permeability of compacted asphalt paving mixtures. Hot mix asphalt testing and inspection w binder dvd hd duration.
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