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ASTM C128 - Record all weights to 0.1g Partially fill...

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Specific Gravity of Fine Aggregate ASTM C-128 Tim Boyer CM 442 Pre-Lab Purpose The purpose of this lab is to provide a standardized test method to measure the bulk specific gravity, a characteristic commonly considered when handling mixtures such as portland cement, bituminous concrete and other mixtures. Equipment Balance – (or scale) capable of 1 kg or more, accurate to 0.1g Pycnometer – a flask or other container in which repeated volume contents can be reproduced Mold – metal mold in the form of a frustrum of a cone (40 ± 3mm at top, 90 ± 3mm at bottom) Tamper – metal tamper weighing 340 ± 15g with a flat, circular tamping face of 25 ± 3mm diameter Procedure Take dry aggregate and soak in water for 24 hours Remove from water a dry to a saturated surface dry state
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Unformatted text preview: Record all weights to 0.1g Partially fill pycnometer with water and introduce 500g of saturated surface dry aggregate Add water till 90% full and eliminate air bubbles Fill pycnometer to calibrated capacity and weigh pycnometer, specimen and water together Remove fine aggregate and dry to constant weight Weigh pycnometer with full capacity of water Post-Lab Test Conditions The test conditions for this process were normal for the procedure. Results Dry Weight = A = 493.00 g Pycnometer + Water = B = 669.40 g Weight of Pycnometer + FA + Water = C = 961.90 g Bulk Specific Gravity = 2.38 Bulk Specific Gravity (SSD) = 2.41 Apparent Specific Gravity = 2.46 Absorption = 1.42 % Comments The procedure was followed as written and everything proceeded normally....
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