ACI Aggregate Testing Technician - Level 1 - Section 4

ACI Aggregate Testing Technician - Level 1 - Section 4 In this test method a set of sieves with progressively _____ openings determines the ______ of the size of the particles sampled. Smaller, distribution The purpose of the test is to determine the _____ of the materials used as aggregates or proposed to be used as aggregates. Grading Results of the test may also be useful in developing relationships related to porosity and packing. True or False? True For material finer than the 75-μm sieve, you must use Test Method T 98. True or False? False; Method T 11 Balances for testing fine aggregate must be readable to _____ . 0.1 g When a sample is 20 kg or more, a ____ shaker is recommended. Mechanical sieve More than ____ min. is considered excessive time spent in the mechanical sieve shaker and may result in _____ of the sample. 10, degradation The size of the field sample should be that shown in Practice T 2, or ____ that required in the chart under 7.4 and 7.5 (except as modified in 7.6), whichever is greater. Four times The minimum size of the test sample of fine dry aggregate is _____ g. 300 Reduction of the size of the sample in the field may occur when ______ is the only test to be done. Sieve analysis The size of the test sample of coarse aggregate or of aggregate mixtures must be between ___ and ___ kg. 1, 300 It is usually important to dry coarse aggregate for the sieve analysis or the results will be affected by the moisture content. True or False? False; it's unnecessary; the results are affected little During the procedure, the nested sieves can be agitated by _____ or ______ . Hand, mechanical apparatus The amount of material on each sieve should be _____ so that particles pass over the sieve openings several times. limited