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
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
