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·Bulk specific gravity is also used in the computation of voids in aggregate in T 19M/T 19 Bulk specific gravity determined on the saturated surface dry basis is used if the aggregate is wet that is if its absorption has been satisfied Conversely the bulk specific gravity determined on the oven dry basis is used for computations when the
·Conversely the bulk specific gravity oven dry is used for computations when the aggregate is dry or assumed to be dry Apparent specific gravity pertains to the relative density of the solid material making up the constituent particles not including the pore space within the particles that is accessible to water
·—Specific gravity relative density —Definition —Determination of specific gravity —Significance of specific gravity —Absolute volume calculations —Absorption and surface moisture —Mixing water and water cementitious material ratio —Absorption and total moisture content —Surface
Specific gravity is the ratio of the density of a material to the density of water In simple terms it is a measure of how much a material weighs in comparison to an equal volume of water The specific gravity of fine aggregate is typically in the range of to which means that it is to 3 times heavier than an equal volume of water
·coarse aggregate The specific gravity may be expressed as bulk oven dry OD specific gravity bulk saturated surface dry SSD specific gravity or apparent specific gravity The bulk SSD specific gravity and absorption are based on aggregate after 15 to 19 hours soaking in water
·aggregate field method and d Determination of surface moisture in fine aggregate field method 2 DETERMINATION OF SPECIFIC GRAVPPY AND WATER ABSGRPTION Object i This test covers the procedures for determining the specific gravity apparent specific gravity and water absorption of aggregates
The specific gravity of the pore free ceramic solid fraction of a lightweight aggregate may be determined by standard ISM Partially Saturated Surface Dry Specific Gravity If o Dry Specific Gravity = 1 M One Day Soak Moisture Content by Weight °60= = /Measured Bulk 1 085 I Dry Loose Density
·Objective To determine specific gravity of a given sample of course aggregate Reference IS 2386 Part III 1963 Apparatus A wire basket of not more than 6 3 mm mesh A stout watertight container in which the basket may be freely suspended well ventilated oven Taping rod An airtight container of capacity similar to that of the basket etc
The apparent specific gravity ASG is defined as the ratio of the weight of dry aggregate to the weight of water having a volume equal to the solid volume of the aggregate excluding its permeable
Alternatively the relative density specific gravity OD is used for computations when the aggregate is dry or assumed to be dry Apparent relative density specific gravity pertain to the solid material making up the constituent particles not including the pore space within the particles that is accessible to water Absorption
Weight of bucket filled with dry rodded coarse aggregate Trial 1 = lb Trial 2 = lb Trial 3 = lb a Calculate the average dry rodded unit weight b If the bulk dry specific gravity of the aggregate is calculate the percent voids between aggregate particles for each trial
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·specific gravity Gsb bulk specific gravity saturated surface dry Gsb SSD or apparent specific gravity Gsa Gsb and absorption are based on aggregate after soaking in water This expressed as a percentage of the dry mass The aggregate is considered dry when it has been maintained at a temperature of 110 ±5°C 230 ±9°F
·Depending on the procedure used the density kg/m 3 lb/ft 3 is expressed as oven dry OD saturated surface dr y SSD or as apparent density Likewise relative density specific gravity a dimensionless quantity is expressed as OD SSD or as apparent relative density apparent specific gravity
Download Table Specific gravity and absorption data for aggregates SSD = saturated surface dry from publication Properties of sustainable concrete containing fly ash slag and recycled
·aggregate The specific gravity may be expressed as bulk oven dry specific gravity bulk saturated surface dry SSD specific gravity or apparent specific gravity The specific gravity and absorption of fine aggregate is normally determined on pass No 4
Bulk Specific Gravity G sb of aggregates is the ratio of the oven dry mass of a unit volume of aggregate including both the impermeable and water permeable void volumes to the mass of the same volume of water; determined as per AASHTO T 84 and T 85 or ASTM C 127 and C 128
·Specific gravity may be expressed as bulk specific gravity Gsb bulk specific gravity saturated surface dry Gsb SSD or apparent specific gravity Gsa Gsb and absorption are based on aggregate after soaking in water This procedure is not intended to be used with lightweight aggregates Terminology Absorption the increase in the mass
The specific gravity of aggregate is the ratio of the density of aggregates to the density of distilled water at a given temperature The density of aggregate depends on its pores being permeable or impermeable to water and based on this the specific gravity of
·This procedure covers the determination of specific gravity and absorption of coarse aggregate in accordance with AASHTO T 85 13 Specific gravity may be expressed as bulk specific gravity G sb bulk specific gravity saturated surface dry G sb SSD or apparent specific gravity G sa G sb and absorption are based on aggregate after
·on Þne aggregate by displacement of water in Test Method C70 Relative density speciÞc gravity SSD is used if the aggregate is in a saturated surface dry condition that is if its absorption has been satisÞ the relative density speciÞc gravity OD is used for computations when the aggregate is dry or assumed to be dry
saturated surface dry SSD adj—related to aggregate particles the condition in which the permeable pores of aggregate particles are filled with water to the extent achieved by submerging in water for the prescribed period of time but without free water on the surface of the particles density n—the mass per unit volume of a
