ASTM C127

Full Name

ASTM C127 – Standard Test Method for Relative Density (Specific Gravity) and Absorption of Coarse Aggregate

Scope

ASTM C127 outlines the procedure for determining the following properties of coarse aggregate:

  • Relative density (specific gravity): the ratio of the mass of a unit volume of aggregate to the mass of an equal volume of water. It is expressed in three forms:
  • Oven-dry (OD) relative density: after the aggregate is dried in an oven.
  • Saturated-surface-dry (SSD) relative density: after the aggregate is soaked in water for a specific duration and the surface moisture is removed.
  • Apparent relative density: pertains to the solid material of the aggregate particles, excluding the pore space within the particles that can be filled with water.
  • Absorption: the increase in the mass of aggregate due to water absorbed in the pore spaces within the particles.

The scope of ASTM C127 includes:

  • Materials: coarse aggregate with a nominal maximum size greater than 4.75 mm (No. 4 sieve).
  • Test method:
    • A sample of aggregate is immersed in water for a specified period to fill the pores.
    • The mass of the sample is determined in both oven-dry and saturated-surface-dry conditions.
    • The relative density and absorption are calculated based on these mass measurements.
  • Significance:
    • These properties are crucial for concrete mix design, as they affect the water demand and volume relationships of the mix.
    • The relative density is used to calculate the voids in aggregate in ASTM C29.
    • The SSD relative density is used for computations when the aggregate is assumed to be in a saturated-surface-dry condition.

ASTM C127 does not cover lightweight aggregates, which are addressed in ASTM C128.

By following this standard, consistent and reliable results can be obtained for the relative density and absorption of coarse aggregate, contributing to accurate mix designs and optimal concrete performance.

ASTM C127 Accredited Laboratory

Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C127 standard.

Our laboratory offers precise and reliable testing services for relative density and absorption of coarse aggregate in accordance with ASTM C127. Our experienced technicians utilize modern equipment to ensure accurate results and timely reporting. By partnering with us, you can:

  • Verify aggregate quality and compliance with specifications
  • Optimize concrete mix designs
  • Improve concrete performance
  • Mitigate potential construction issues

Contact us today to learn more about our coarse aggregate testing services and how we can support your project.

Resources

Keywords

relative density; specific gravity; absorption; coarse aggregate; oven-dry; saturated-surface-dry; apparent relative density; bulk density; voids

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