ACI Aggregate Testing Technician - Level 1 - Section 5

ACI Aggregate Testing Technician - Level 1 - Section 5 The method is appropriate for coarse but not ____ aggregate. Lightweight SSD refers to _____ - _____ - _____ condition. saturated-surface-dry To calculate the volume of aggregate in a mixture (including the voids between the particles) is to determine the ______. Bulk specific gravity When the mass of the water within the voids after 24-hour absorption is included in the volume of aggregate, you are calculating the ______. Relative specific gravity (SSD) Computing the impermeable portion of the aggregate is finding the _____. Apparent specific gravity The laboratory standard for absorption is the level obtained after ____ of soaking. 15 hr Absorption values pertain to the ____ in the mass of the aggregate due to ____ absorbed in the pores. Change, water Forms of conditioning (besides the 15-hr soak) for which this test may be used include ______ and _____. Boiling water, vacuum saturation Aggregate is considered "dry" when it has been at 230 ± 9°F long enough for all uncombined water to be removed by reaching a constant mass. True or False? True In sampling, all aggregate not passing a 2.36 mm sieve by dry sieving should be retained. True or False? False; all not passing a 4.75 mm sieve When material is tested in separate size fractions, the minimum mass of the sample in each fraction should be the ______ between the prescribed maximum and minimum sizes of the fraction. Difference In carrying out the procedure, dry the sample at ________ at room temperature for ____ hr, and immerse in water at for ____ hr. 230 ± 9°F, cool, 1-3, room temperature, 24 ± 4 hr Under some conditions the initial drying period and the 15-hr soak may be skipped. True or False? True When aggregate isn't oven dried before soaking, the absorption and relative density (specific gravity) (SSD) values may be ______ . Higher These values are higher because the larger particles (75 mm plus) require a shorter soaking period to absorb the moisture. True or False?