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 C88 evaluates aggregate soundness by cycling samples through sodium or magnesium sulfate solutions and measuring mass loss after multiple cycles.

Question 2

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

Accepted Answer

Water

Answer

The Micro-Deval test uses water along with steel ball charges to abrade aggregate, simulating wet abrasion conditions encountered in service.

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

CSA A23.1 limits magnesium sulfate soundness loss to 12% for coarse aggregate in severe exposure concrete to ensure adequate freeze-thaw durability.

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

Freeze-thaw durability is assessed by calculating a durability factor based on mass loss after a specified number of freeze-thaw cycles.

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

Strained quartz and microcrystalline or cryptocrystalline silica are the petrographic features most directly associated with ASR susceptibility.

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL Advanced Aggregate Characterization 2