CTQP Materials Sampling and Testing 2

Question 1

What are the two key values determined by the Standard Proctor compaction test (AASHTO T 99)?

Accepted Answer

Maximum dry density and optimum moisture content of a soil

Answer

The Standard Proctor test establishes the maximum dry density and the optimum moisture content, which serve as the compaction standard against which field results are compared.

Question 2

What property does the Limerock Bearing Ratio (LBR) test measure for base course materials in Florida?

Accepted Answer

The bearing strength or load-bearing capacity of limerock and similar base course materials

Answer

The LBR test measures the bearing strength of limerock and stabilized materials used as base course, and the result is expressed as a percentage relative to a standard crushed stone.

Question 3

What does the Los Angeles Abrasion test (AASHTO T 96) measure for coarse aggregates?

Accepted Answer

The resistance of coarse aggregate to degradation by abrasion and impact

Answer

The LA Abrasion test tumbles aggregate with steel balls in a rotating drum to measure the percent loss due to abrasion and impact, indicating aggregate hardness and durability.

Question 4

What information does a sieve analysis (gradation test) provide about an aggregate sample?

Accepted Answer

The particle size distribution (gradation) of the aggregate

Answer

A sieve analysis separates aggregate particles by size using a series of nested sieves, producing a gradation curve that shows the percentage of material passing each sieve size.

Question 5

When performing a concrete slump test per AASHTO T 119, what does a higher slump value indicate about the fresh concrete?

Accepted Answer

Greater workability and more fluid consistency of the fresh concrete

Answer

A higher slump indicates more workable, fluid concrete; this is usually due to higher water content, but can also result from water-reducing admixtures.

CTQP - Construction Training & Qualification Program Practice Test

CTQP - Construction Training & Qualification Program Practice Test

CTQP Materials Sampling and Testing 2