Quiz No. 5

The fine aggregate shall be free from injurious amounts of organic impurities. If subjected to the colorimatic test for organic impurities and a color darker than the standard is produced, it shall be rejected. However, when tested for the effect of organic impurities on strength of mortar by AASHTO T 71, the fine aggregate may be used if the relative strength at 7 & 28 days is not less than _________”.

• 95%

• 90%

• 85%

• 98%

Given the average stress of unwashed sample with 23.2 and the average standard of washed aggregate with 22.9 what is the Relative Strength, RS?

• 101%

• 102%

• 103%

• 100%

Soundness Test can be conducted using what kind of acid?

• Magnesium Sufate

• Sodium Sulfate

• Sodium Oxide

• Magnesium Oxide

If the Fine Aggregate is subjected to five (5) cycles of the sodium sulfate soundness Test, the weighted loss shall not  exceed ___ mass percent.

• 10

• 15

• 12

• 13

Solve for A.

• 39%

• 40%

• 42%

• 41%

Solve for B.

• 4.00

• 5.00

• 6.00

• 7.00

Solve for C.

• 1.456

• 2.456

• 3.456

• 0.456

Solve for D.

• 3.50

• 4.50

• 2.50

• 5.50

Solve for E.

• 0.83

• 0.73

• 0.93

• 0.38

Solve for F.

• 3.284

• 2.284

• 4.284

• 1.284