Minnesota Aggregate Technician
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. What is the primary purpose of aggregate testing in construction
materials?
A. To determine paint adhesion
B. To evaluate material properties for suitability in construction
applications
C. To measure electrical conductivity
D. To test chemical reactivity in fuels
Aggregate testing ensures that materials meet required physical and
mechanical standards for safe and durable construction
performance.
2. Which ASTM method is commonly used for sieve analysis of
aggregates?
, A. ASTM C29
B. ASTM C136
C. ASTM C88
D. ASTM D75
ASTM C136 outlines the standard procedure for determining particle
size distribution using sieve analysis.
3. What does fineness modulus indicate?
A. Aggregate color consistency
B. Average particle size of fine aggregates
C. Moisture content level
D. Chemical composition
Fineness modulus provides an index number representing the
average size of particles in fine aggregate.
4. The main purpose of washing aggregates before testing is to:
A. Increase particle size
B. Remove dust and fine particles that may distort results
C. Dry the aggregate
D. Increase density
Washing removes clay and dust to ensure accurate gradation and
material property measurements.
5. What is the bulk specific gravity of aggregate used primarily for?
A. Determining color uniformity
B. Mix design calculations and volume relationships
, C. Measuring electrical resistance
D. Determining particle shape
Bulk specific gravity is essential in proportioning asphalt and
concrete mixtures accurately.
6. Which test determines resistance of aggregate to abrasion and
impact?
A. Soundness test
B. Los Angeles abrasion test
C. Sieve analysis
D. Moisture content test
The LA abrasion test evaluates aggregate durability under
mechanical wear and impact.
7. What does high absorption in aggregate indicate?
A. Low porosity
B. High porosity and ability to absorb water
C. High density
D. High hardness
High absorption indicates porous aggregate which may affect
durability and mix water demand.
8. Which of the following is a fine aggregate?
A. Gravel
B. Crushed stone
C. Sand
, D. Riprap
Fine aggregate consists of materials like sand that pass the 4.75 mm
sieve.
9. The sampling of aggregates from stockpiles should ideally be done:
A. From only the top layer
B. From multiple locations and depths
C. Only from edges
D. Only after rain
Representative sampling requires collecting material from various
points to avoid bias.
10. What is the purpose of the soundness test?
A. Measure density
B. Assess resistance to weathering and freeze-thaw cycles
C. Determine color
D. Measure moisture
Soundness testing evaluates durability under environmental
conditions like freezing and thawing.
11. What device is used to determine moisture content in
aggregates quickly?
A. Sieve shaker
B. Pycnometer
C. Moisture balance or oven drying method
D. Abrasion machine
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of aggregate testing in construction
materials?
A. To determine paint adhesion
B. To evaluate material properties for suitability in construction
applications
C. To measure electrical conductivity
D. To test chemical reactivity in fuels
Aggregate testing ensures that materials meet required physical and
mechanical standards for safe and durable construction
performance.
2. Which ASTM method is commonly used for sieve analysis of
aggregates?
, A. ASTM C29
B. ASTM C136
C. ASTM C88
D. ASTM D75
ASTM C136 outlines the standard procedure for determining particle
size distribution using sieve analysis.
3. What does fineness modulus indicate?
A. Aggregate color consistency
B. Average particle size of fine aggregates
C. Moisture content level
D. Chemical composition
Fineness modulus provides an index number representing the
average size of particles in fine aggregate.
4. The main purpose of washing aggregates before testing is to:
A. Increase particle size
B. Remove dust and fine particles that may distort results
C. Dry the aggregate
D. Increase density
Washing removes clay and dust to ensure accurate gradation and
material property measurements.
5. What is the bulk specific gravity of aggregate used primarily for?
A. Determining color uniformity
B. Mix design calculations and volume relationships
, C. Measuring electrical resistance
D. Determining particle shape
Bulk specific gravity is essential in proportioning asphalt and
concrete mixtures accurately.
6. Which test determines resistance of aggregate to abrasion and
impact?
A. Soundness test
B. Los Angeles abrasion test
C. Sieve analysis
D. Moisture content test
The LA abrasion test evaluates aggregate durability under
mechanical wear and impact.
7. What does high absorption in aggregate indicate?
A. Low porosity
B. High porosity and ability to absorb water
C. High density
D. High hardness
High absorption indicates porous aggregate which may affect
durability and mix water demand.
8. Which of the following is a fine aggregate?
A. Gravel
B. Crushed stone
C. Sand
, D. Riprap
Fine aggregate consists of materials like sand that pass the 4.75 mm
sieve.
9. The sampling of aggregates from stockpiles should ideally be done:
A. From only the top layer
B. From multiple locations and depths
C. Only from edges
D. Only after rain
Representative sampling requires collecting material from various
points to avoid bias.
10. What is the purpose of the soundness test?
A. Measure density
B. Assess resistance to weathering and freeze-thaw cycles
C. Determine color
D. Measure moisture
Soundness testing evaluates durability under environmental
conditions like freezing and thawing.
11. What device is used to determine moisture content in
aggregates quickly?
A. Sieve shaker
B. Pycnometer
C. Moisture balance or oven drying method
D. Abrasion machine
