CCIL Advanced Aggregate Characterization 3

Question 1

The uncompacted void content of fine aggregate (ASTM C1252) is used primarily to evaluate which aggregate property?

Accepted Answer

Particle angularity and surface texture

Answer

Soundness under freeze-thaw cycling

Answer

Organic impurity content

Answer

Alkali reactivity potential

Question 2

What does a high flakiness index value in coarse aggregate indicate about its particle shape?

Accepted Answer

A high proportion of thin, plate-like particles

Answer

Particles are predominantly cubical

Answer

Particles have high surface roughness

Answer

Particles are well-rounded and smooth

Question 3

Per ASTM D4791, a coarse aggregate particle is classified as flat and elongated when its longest dimension to shortest dimension ratio exceeds which threshold?

Accepted Answer

5:1

Answer

2:1

Answer

3:1

Answer

10:1

Question 4

Which method is used to measure the fracture faces on coarse aggregate particles to assess angularity for use in HMA design?

Accepted Answer

ASTM D5821 Fractured Particle Count

Answer

ASTM C1252 Uncompacted Void Content

Answer

ASTM C131 Los Angeles Abrasion

Answer

ASTM C136 Sieve Analysis

Question 5

In advanced aggregate characterization, what does a low bulk specific gravity value typically suggest about an aggregate's internal structure?

Accepted Answer

High internal porosity or lightweight mineralogy

Answer

Dense, low-porosity mineralogy

Answer

High alkali content

Answer

Superior abrasion resistance

Question 6

Which test is used to evaluate the resistance of fine aggregate to mechanical degradation in the Micro-Deval apparatus, and the result is expressed as?

Accepted Answer

Percentage mass loss after abrasion

Answer

Durability factor after freeze-thaw

Answer

Los Angeles abrasion value

Answer

Degradation factor by wet sieving

Question 7

Surface texture of aggregate particles influences which fresh concrete property most directly?

Accepted Answer

Water demand and workability

Answer

Setting time of cement paste

Answer

Air entrainment stability

Answer

Chloride permeability