ACI Aggregate Testing Technician - Level 1 - Section 6

ACI Aggregate Testing Technician - Level 1 - Section 6 Relative density (specific gravity) (OD) is used when the aggregate is ____ while relative density (specific gravity) (SSD) is used when the aggregate is ______ . Oven Dry, Saturated Surface-Dry ____ does not include the pore space within particles that is accessible to water. Apparent specific gravity There may be a low absorption in aggregates mined below the water table if they haven't been allowed to dry. True or False? False; a higher absorption Equipment needed to carry out the gravimetric procedure includes: 1) _____ ; 2) ______ ; 3) _____ ; and 4) ______ . Balance, pycnometer, mold, tamper The balance should hold ____ kg or more and a flask (container) of the type described in AASHTO ___ is suitable for use. 1, T 133 After the sample of fine aggregate has been dried and cooled, it should be covered with ____ for ____ hours. Water, 15 to 19 The sample, after soaking, should be spread on a flat, absorbent surface to dry. True or False? False; nonabsorbent surface Mechanical means such as tumbling and stirring may be used to speed up the drying process. True or False? True There should be some ____ in the sample on the first trial of the cone test. Surface moisture When the mold is lifted, the sample will hold its molded shape if there is _____ . Surface moisture A surface-dry condition has usually occurred when the aggregate ____ after molding. Slumps slightly Paper towels, colorimetric methods, a sheet of rubber, and 10 drops of a tamper are part of alternate tests on materials that do not ______ . Readily slump The procedure used in determining the total mass of the pycnometer, sample, and water includes which of the following: a) completely filling the pycnometer with water b) adding saturated surface-dry fine aggregate c) filling with additional water d) agitating the pycnometer to form air bubbles e) adjusting the temperature to 23 ± 1.7 °C