CCIL Advanced Aggregate Characterization 2

Question 1

Which test method is used to evaluate the soundness of aggregates by measuring resistance to disintegration using sodium or magnesium sulfate?

Accepted Answer

ASTM C88 Sulfate Soundness

Answer

ASTM C131 Los Angeles Abrasion

Answer

ASTM C289 Alkali Reactivity

Answer

ASTM C127 Specific Gravity

Question 2

In the Micro-Deval abrasion test for fine aggregate, what liquid medium is used during the test?

Accepted Answer

Water

Answer

Sodium sulfate solution

Answer

Magnesium chloride brine

Answer

Isopropyl alcohol

Question 3

What is the maximum allowable magnesium sulfate soundness loss for coarse aggregate used in severe exposure concrete per CSA A23.1?

Accepted Answer

12%

Answer

6%

Answer

9%

Answer

18%

Question 4

During a freeze-thaw durability test on coarse aggregate, which parameter is typically measured to assess performance?

Accepted Answer

Durability factor based on mass loss

Answer

Change in bulk specific gravity

Answer

Loss in compressive strength

Answer

Change in absorption capacity

Question 5

Which petrographic feature in coarse aggregate is most directly associated with accelerated alkali-silica reaction (ASR) susceptibility?

Accepted Answer

Strained quartz and microcrystalline silica

Answer

Interlocked crystal texture

Answer

High feldspar content

Answer

Presence of mica minerals

Question 6

What is the primary purpose of determining the aggregate crushing value (ACV) in advanced characterization?

Accepted Answer

Assess resistance to mechanical degradation under load

Answer

Measure alkali reactivity potential

Answer

Quantify water absorption rate

Answer

Determine particle density

Question 7

In ASTM C295 petrographic examination, what percentage of reactive mineral constituents in coarse aggregate is typically considered the threshold requiring further chemical testing?

Accepted Answer

5%

Answer

1%

Answer

15%

Answer

25%