Referenced Documents. ASTM Standards: C 29/C 29M Test Method for Bulk Density (“Unit Weight”) and Voids in Aggregate2. C 70 Test Method for Surface. ASTM Designation: C 1. SCOPE. This method covers the determination of bulk and apparent specific gravity, 23/23ºC. (/ºF), and absorption. Qty. Model, Description. 1, Choose One: HBA, Adam Core balance g x g, V 60Hz. HBA.4F, Adam Core balance g x g, V 50/.
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It is also expressed as the ratio of the density of the aggregate particles to the density of water.
Relative density specific gravity SSD is used in the determination of surface moisture on fine aggregate by displacement of water in Test Method C Relative density specific gravity SSD is used if the aggregate is in a saturated surface-dry condition, that is, if its absorption has been satisfied.
Alternatively, the relative density specific gravity OD is used for computations when the aggregate is dry or assumed to be dry. This value is not widely used in construction aggregate technology.
ASTM C Standard
The laboratory standard for absorption is that obtained after submerging dry aggregate for a prescribed period of time. Aggregates mined from below the water table commonly have a moisture content greater than the absorption determined by this test method, if used without opportunity to dry prior to use.
Conversely, some aggregates that have not been continuously maintained in a moist condition until used are likely to contain an amount of absorbed moisture less than the h soaked condition. For an aggregate that has been in contact with water and that has free moisture on the particle surfaces, the percentage of free moisture is determined by deducting the absorption from the total moisture content determined by Test Method C18 by drying.
The values obtained for absorption by other test methods will be different than the values obtained by the prescribed h soak, as will the relative density specific gravity SSD.
C1228 relative density specific gravitya dimensionless quality, is expressed as oven-dry ODsaturated-surface-dry SSDor as apparent relative density specific gravity. The OD relative density is determined after drying the aggregate.
The SSD relative density and absorption are c28 after soaking the aggregate in water for a prescribed duration. No other units of measurement are included in this standard.
These notes and footnotes excluding those in tables and figures shall not be considered as requirements of this test method. It is the responsibility of the user of this standard to establish appropriate safety v128 health practices and determine the applicability of regulatory limitations prior to use. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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