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
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
