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A dimensionless value comparing the density of the aggregate to that of water. It is typically reported in three states: Oven-Dry (OD), Saturated-Surface-Dry (SSD), and Apparent.

Place the SSD sample into a pycnometer or flask partially filled with water, remove air bubbles (by rolling or agitating), and fill to capacity. Critical Equipment Precision in ASTM C128 depends on standardized equipment:

| Issue | Description | Impact | |-------|-------------|--------| | | Achieving true SSD requires judgment with the cone mold. | Inter-laboratory RSD can be 1–2%, higher than C127 for coarse aggregate. | | Air Entrapment | Fine particles trap tiny air bubbles in the pycnometer. | Falsely lowers measured specific gravity. Requires vigorous rolling/agitation. | | Material Segregation | Very fine (silt/clay) may remain suspended in water. | Leads to erroneous mass readings. Some labs use a surfactant. | | Time | 24-hour soak + drying time. | Not suitable for rapid field QC (though a 15–20 min modified soak is sometimes used). | | Temperature Sensitivity | Water density changes with temperature. | Requires correction factors or a controlled water bath. | astm c128

Aggregates are porous and can soak up water. If an aggregate has high absorption , it will "steal" water from the cement paste, making the concrete hard to work with. Conversely, if it is already wet, it adds extra water to the mix, which can weaken the final structure. 2. The Saturated Surface-Dry (SSD) Concept

Decant excess water and dry the sample with warm air until it reaches a "free-flowing" state. A dimensionless value comparing the density of the

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This standard is critical in concrete and asphalt mix design. Unlike coarse aggregates (ASTM C127), fine aggregates (sand) have a much larger surface area and different packing characteristics, requiring a distinct testing procedure (using a pycnometer). Critical Equipment Precision in ASTM C128 depends on

formulas used for the calculations? AI can make mistakes, so double-check responses Copy Creating a public link... You can now share this thread with others Good response Bad response 12 sites ASTM C128-22 - Standard Test Method for Relative Density ... ASTM C128-22 is a standard published by ASTM International. Its full title is "Standard Test Method for Relative Density (Specific... SIST e-Poslovanje ASTM C128 Standard Test Method For Density, Relative ... Density, Relative Density (Specific Gravity), and Absorption. of Fine Aggregate1. This standard is issued under the fixed designat... Scribd Fine Aggregate Density Testing Method | PDF - Scribd * 1 Objective 3.3 Dry condition. This Standard establishes the procedures for Condition in which the aggregates were dried in an o... Scribd LAB 3 | PDF | Density - Scribd STANDARD TEST METHOD FOR RELATIVE DENSITY (SPECIFIC GRAVITY) AND * ABSORPTION OF FINE AGGREGATE – ASTM C128 - 15. Laboratory No. 3... Scribd Astm C128-22 | PDF | Density - Scribd &RS\ULJKW E\ $670 ,QW O DOO ULJKWV UHVHUYHG :HG 0DU 87& ... same material. ... water. ... with flask and contents within the tempe... Scribd ASTM C128: Specific Gravity of Fine Aggregate | PDF - Scribd 3. Current edition approved Dec. 15, 2022. Published January 2023. Originally Available from American Association of State Highway... Scribd Conical Mold And Tamper, ASTM C128 - Forney CMT Supplies Steel tamper weighs 12 oz (340g) and has 1 inch diameter (25mm) flat circular tamping face. Meets: ASTM C128; AASHTO T84. Forney CMT Supplies effective determination by a method based on electrical conductivity Dec 9, 2025 —

The data obtained from this test is crucial for engineers and batch plant operators for two primary reasons: