relative density
['rel?tiv 'densiti]
['r?l?t?v 'd?ns?ti]
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1. No evident relation between coke true relative density and microstrength was f.
焦炭显微强度与真相对密度间无明显的相关关系.
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2. This sort of stone has a relative density of 2.7.
这种石头的相对密度是2.7.
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3. It crystallises in colorless rhombohedral with a relative density of 1.95.
高氯酸铵是一种无色菱形晶体,相对密度1.95.
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4. The relative density is 1.527.
味咸凉而微苦,相对密度1.527.
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5. Figure 5 – Effect of compaction pressure on the relative density of AISI 434 L green compacts.
图5-的影响,压实的压力,相对密度艾西四百三十四升绿色协约.
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1. the ratio of the density of something to the density of a standard
1.相对密度
1.相对密实度
1.相对密度
1.相对密度
1.相对密度
2.多孔体的密度与无孔状态下的同成分材料的密度之比，通常以百分率表示。
1.相对密度
2.砂土最疏松状态的孔隙比和天然孔隙比之差与砂土最疏松状态的孔隙比和最紧密状态的孔隙比之差的比值。
1.相对密度
2.单位面积或空间中反映生物数量多少的相对指标。
1.相对密度
1.相对密度
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ASTM C128 - 15
Standard Test Method for
Relative Density (Specific Gravity) and Absorption of Fine
Active Standard ASTM C128 | Developed by Subcommittee:
Book of Standards Volume:
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Significance and Use
 Relative density (specific gravity) is the ratio of mass of an aggregate to the mass of a volume of water equal to the volume of the aggregate particles – also referred to as the absolute volume of the aggregate. It is also expressed as the ratio of the density of the aggregate particles to the density of water. Distinction is made between the density of aggregate particles and the bulk density of aggregates as determined by Test Method C29/C29M, which includes the volume of voids between the particles of aggregates.
 Relative density is used to calculate the volume occupied by the aggregate in various mixtures containing aggregate including hydraulic cement concrete, bituminous concrete, and other mixtures that are proportioned or analyzed on an absolute volume basis. Relative density (specific gravity) is also used in the computation of voids in aggregate in Test Method C29/C29M and in Test Method C1252. Relative density (specific gravity) (SSD) is used in the determination of surface moisture on fine aggregate by displacement of water in Test Method C70. 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.
 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. This value is not widely used in construction aggregate technology.
 Absorption values are used to calculate the change in the mass of an aggregate material due to water absorbed in the pore spaces within the constituent particles, compared to the dry condition, if it is deemed that the aggregate has been in contact with water long enough to satisfy most of the absorption potential. 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 24-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 C566 by drying.
 The general procedures described in this test method are suitable for determining the absorption of aggregates that have had conditioning other than the 24-h soak, such as boiling water or vacuum saturation. The values obtained for absorption by other test methods will be different than the values obtained by the prescribed 24-h soak, as will the relative density (specific gravity) (SSD).
 This test method covers the determination of relative density (specific gravity) and the absorption of fine aggregates. The relative density (specific gravity), a dimensionless quality, is expressed as oven-dry (OD), saturated-surface-dry (SSD), or as apparent relative density (specific gravity). The OD relative density is determined after drying the aggregate. The SSD relative density and absorption are determined after soaking the aggregate in water for a prescribed duration.
 This test method is not intended to be used for lightweight aggregates that comply with Specification C332 Group I aggregates.
 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
 The text of this test method references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this test method.
 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately)
ASTM Standards
Test Method for Bulk Density (Unit Weight) and Voids in Aggregate
Test Method for Surface Moisture in Fine Aggregate
Test Method for Materials Finer than 75-m (No. 200) Sieve in Mineral Aggregates by Washing
Terminology Relating to Concrete and Concrete Aggregates
Test Method for Density, Relative Density (Specific Gravity), and Absorption of Coarse Aggregate
Test Method for Density of Hydraulic Cement
Specification for Lightweight Aggregates for Structural Concrete
Specification for Lightweight Aggregates for Insulating Concrete
Test Method for Total Evaporable Moisture Content of Aggregate by Drying
Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
Practice for Reducing Samples of Aggregate to Testing Size
Practice for Sampling Aggregates
Test Methods for Specific Gravity of Soil Solids by Water Pycnometer
AASHTO Standard
ICS Number Code 91.100.30 (Concrete and concrete products)
UNSPSC Code
UNSPSC Code (Aggregates)
Referencing This Standard
DOI: 10.-15
ASTM International is a member of CrossRef.
Citation Format
ASTM C128-15, Standard Test Method for
Relative Density (Specific Gravity) and Absorption of Fine
Aggregate, ASTM International, West Conshohocken, PA, 2015,ScienceDirect
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