Specific Gravity is the ratio of the weight of a given volume of aggregate to the weight of an equal volume of water. Bulk specific gravity used for calculating in the concrete mix but apparent specific gravity used for calculating aggregate weight. Which effect the Stones with lower specific gravity are commonly weaker than those with greater specific gravity values. Specific gravity test of aggregates is done to measure the quality of the aggregates and the water absorption test determines the water holding capacity of the coarse and fine aggregate. Aggregate specific gravity is useful in making weight-volume conversions and in calculating the void content in compacted HMA (Roberts et al., 1996 [1]). C127 Test Method for Relative Density (Specific Gravity) and Absorption of Coarse Aggregate D653 Terminology Relating to Soil, Rock, and Contained Fluids D3740 Practice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as … Density is an important parameter for aggregate. 1.2 The specific gravity and absorption of fine aggregate is For aggregates, density is determined by multiplying the relative density (specific gravity) of the aggregate times the density of water. Specific Gravity Of Coarse Aggregate In Urdu/Hindi (ASTM C127) specific gravity, the bulk specific gravity on the basis of weight of saturated surfacedry aggregate, andthe absorption as defined in AASHTO M 132. Water, at a temperature of 73.4°F (23°C) has a specific gravity of 1. Specific gravity of fine aggregate (sand) is the ratio of the weight of given volume of aggregates to the weight of equal volume of water. Precautions The graduated cylinder used should be cleaned. Some lightweight shales (not used in HMA production) can have specific gravities near 1.050, while other aggregate can have specific gravities above 3 Absolute Specific Gravity = (Weight of oven-dried aggregate at 100 c for 24 hours) / (Weight of water’s volume equal to that of aggregate’s solids excluding pores) Essential Points Most of the aggregates possess a relative density within 2.4 – 2.9 with a similar particle density about 2400-2900 Kg/m 3 ( 150-181 lb/ft 3 ). 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 volume of gas-free distilled water at a stated temperature. The specific gravity may be expressed as bulk oven dry (O.D.) Specific gravity is defined as the ratio of weight of a given volume of aggregate to the weight of equal volume of water. 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]). 4 Material. Specific gravity of coarse aggregate Apparatus An equilibrium or scale of volume of minimum 3 kg, decipherable and precise to 0.5 g and it has to be of such shape and kind that it allows the basket holding the specimen to be discharged from the beam and the measured in the water. Specific Gravity (Relative Density): Is the ratio of the mass of an aggregate to the mass of a volume of water equal to the volume of the aggregate particles. Now aggregate sample shall be placed in the oven at a temperature of 100-1100C for 24±1/2 hours. The shape of particles greatly affect the closeness of the packing. 2. particle size and shape 3.Greding of aggregate 4.Moisture content of aggregate. 9/23/2016 1 Specific Gravity and Absorption of Aggregate by Volumetric Immersion Method (PhunqueTest) ASTM June 2015 Meeting by Bryce Simons, P.E. Calculation of Specific gravity & water absorption of the aggregate For a aggregate. Specific gravity is ratio of mass to volume to that of water. Bulk Specific Gravity (Gsb)– the ratio of the mass, in air, of a volume of aggregate (including the permeable and impermeable voids in the particles, but not including the voids between particles) to the mass of an equal volume of gas-free distilled water at a stated temperature. 9/23/2016 2 Frustrated and Confused Problems with ASTM C 128/AASHTO Aggregate are porous materials and water can seep into the pores of the particles. Fig. Determine the specific gravity of the given soil sample. The fine aggregate bulk specific gravity (G sb) is used to compute the fine aggregate volume (AI, 2001; O'Brien & Haddock, 2009). After 24 hour again weighed the sample aggregate (D, gms). The specific gravity of an aggregate is considered as the measure of strength or quality of the material. The specific gravity of sands is considered to be around 2.65. 1.3 The … Dry the coarse aggregate so that it does not absorb moisture otherwise it will not give the desired results. For a given specific gravity the angular aggregates show a lower bulk density. 10.1. aggregate specific gravity and absorption for mineral aggregates used in asphaltic concrete, other than asphaltic concrete friction course, shall be determined on Minus No. Specific gravity is a fundamental property of aggregates that are used in many Procedure (i) Approximately 2 kg of total specimen is washed properly to get rid of any fines, sapped and are put in a wire basket and saturated in distilled water at a 22- 32º C temperature and a cover of minimum 5cm of water on top of the crest of basket. Aggregate Blending, Absorption & Specific Gravity 20 Fine Aggregate Specific Gravity Calculations - Example Problem Given A = mass oven dry =489.3 B = mass of pycnometer filled with water = 666.5 C = mass pycnometer 1- Specific Gravity The specific gravity also called as “relative density” of an aggregate is the ratio of its weight to the weight of an equal volume of water (water displaced on immersion) S.G = density of solid density of Specific Gravity The ratio of weight of oven dried aggregates maintained for 24 hours at a temperature of 100 to 1100C, to the weight of equal volume of water displaced by saturated dry surface aggregate is known as specific gravity Concrete is made up of using various materials which have different specific gravity. Bulk Density of Aggregate [1]The bulk density or unit weight of an aggregate is the mass or weight of the aggregate that required to fill a container of a specified unit volume. 4 (4.75 mm) sieve – Dry aggregate – Soak in water for 24 hours – Calibrated Pycnometer of known volume is used » Filled with water to calibration mark (B) – Spread out the aggregate … Relative density (specific gravity) is also used in the computation of voids in aggregate in Test Method C29/C29M and in Test Method C1252. All the Dr. Louay Mohammad CE 3700 Notes 9 Fine Aggregate Specific Gravity Apparatus – Balance – Pycnometer – Cone mold – Tamper Fine Aggregate Specific Gravity ASTM C128 – ≥ 1000 gm on minus No. The purpose of this experiment is to determine the following parameters of coarse aggregate: 1) Bulk Specific Gravity 2) Bulk Specific Gravity ( SSD) 3) Apparent Specific Gravity … About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Specific gravity of fine aggregate can be defined as the ratio of weight of given volume of coarse aggregate to weight of given volume of distilled water. Fine aggregate angularity apparatus. As specific gravity is just a comparison, it can be applied across any units. Specific gravity of fine aggregate (sand) is defined as the ratio of the weight of a given volume of aggregates to the weight of equal volume of water. Contents:Apparatus for Specific Gravity TestProcedure of TestCalculationsQuestion : Apparatus for Specific Gravity Test A balance of capacity not less […] specific gravity, bulk saturated surface dry (SSD) specific gravity, or apparent specific gravity. Specific gravities can vary widely depending upon aggregate type. Relative density (specific gravity) (SSD) is used in the determination of surface moisture on fine aggregate by displacement of water in Test Method C70 . Specific Gravity & Absorption of Fine Aggregate Set is an all-in-one solution with all the components you need for the test including a pycnometer jar with a top, conical mold, and tamper. Test Standard : IS 2386-Part III: 1963 The specific gravity of an aggregate is defined as the ratio of the mass of the solid of a given volume of sample to the mass of an equal volume of gas-free distilled water, both taken at the standard temperature i.e. The specific gravity of fine aggregate (sand) is considered to be around 2.65 to 2.67. 27-degree . Determination of the Specific Gravity and Water Absorption of the Aggregates. The object of the experiment is to determine the Specific Gravity & Water Absorption of Fine Aggregate by using Pycnometer or Specific Gravity Flask. Specific Gravity & Absorption of Coarse Aggregate set has a Wire Basket and a Polyethylene Container, all the necessary components to perform the test. 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