ATT Fine Aggregate Quality Tests 3

Question 1

What is the minimum sample mass required for a sieve analysis (ASTM C136) of fine aggregate?

Accepted Answer

300 g

Answer

ASTM C136 requires a minimum sample mass of 300 g for fine aggregate sieve analysis to ensure representative results.

Question 2

Which ASTM standard governs the mortar-making properties test used to evaluate fine aggregate with elevated organic content?

Accepted Answer

ASTM C87

Answer

ASTM C87 compares the compressive strength of mortar made with the suspect aggregate to mortar made with washed aggregate to determine if organics are harmful.

Question 3

The acceptable fineness modulus range for fine aggregate used in concrete typically falls between:

Accepted Answer

2.3 and 3.1

Answer

ACI 301 and ASTM C33 specify that the fineness modulus of fine aggregate should be between 2.3 and 3.1 for concrete applications.

Question 4

When performing the bulk density (unit weight) test per ASTM C29 on fine aggregate using rodding, how many layers are used?

Accepted Answer

3 layers, each rodded 25 times

Answer

ASTM C29 rodding procedure uses three equal layers, each consolidated by 25 strokes of the tamping rod.

Question 5

ASTM C123 is used to determine the percentage of which material in fine aggregate?

Accepted Answer

Lightweight pieces

Answer

ASTM C123 uses a heavy liquid (such as zinc chloride solution) to float and separate lightweight pieces from the aggregate.

(ATT) ACI Aggregate Testing Technician Practice Test

(ATT) ACI Aggregate Testing Technician Practice Test

ATT Fine Aggregate Quality Tests 3