ACI Aggregate Testing Technician - Level 1 - Section 3

ACI Aggregate Testing Technician - Level 1 - Section 3 During this test method, water-soluble materials, clay particles, and incidental aggregate particles are removed from the aggregate. True or False? True Of the two possible test procedures, Procedure A is to be used unless otherwise specified. True or False? True In one of the methods only ____ is used for washing and in the other method a ____ is used as well. Water, wetting agent The purpose of using a wetting agent is to ____ finer than the 75 μm sieve from the coarser material. Loosen material Dry sieving separates out the finer particles more effectively than wet sieving. True or False? False; wet sieving works better The kinds of materials that respond well to wetting agents include ____ coatings, coatings on aggregates that have been extracted from mixtures. Clay, bituminous Complete the list of equipment needed to carry out the procedures: a) a balance or scale b) _________ c)a ________ d)an _______ Two sieves (No. 200 & No. 8-16), container (pan or vessel), oven A common wetting agent is ordinary liquid _____. Dishwashing detergent A danger in using mechanical washing equipment is that ____ may be degraded. Samples At the beginning and conclusion of both procedures, the test sample is _____ to constant mass at ______. Dried in the oven, 230 ± 9°F When the wash water containing the solids is poured into the nested sieves, the _______ sieve should be on top. Coarser After the initial washing, the operation should be repeated until the _____ water is _____. Wash, clear The entire procedure may be a continuous operation when ____ is used. Mechanical washing equipment