ETCM 3368- Spring 2024-Quiz 1

The percentage of concrete pavements in the U.S is about----

• 94%

• 60%

• 50%

• 6%

The chemical reaction between cement and water is called-----------

• Setting

• Hardening

• Hydration

• Dehydration

The most expensive component in concrete is---------

• Sand

• Cement

• Fly ash

• Gravel

Which concrete component constitutes the highest percentage in concrete?

• Cement

• Air

• Water

• Aggregate

Which admixture do you expect to be added to concrete in freezing areas?

• Water reducing admixture

• Air Entraining admixture

• Accelerating admixture

• Retarding admixture

You can walk over a poured concrete after the------

• initial setting time

• final setting time

• hardening time

• walking time

Which admixture do you expect to be added to concrete if the mix will be added on a busy road to minimize road closure?

• Water reducing admixture

• Air Entraining admixture

• Accelerating admixture

• Retarding admixture

If the weight of water needed in a concrete mix is 20 lbs., and the weight of cement needed in this mix is 40 lbs. What is the water-cement ratio?

• 2

• 0.5

• 0.45

• 0.5 lbs.

Concrete achieves most of its full effective strength after about---------- days

• 7

• 10

• 14

• 28

Reducing the volume of air voids in a fresh cementitious mixture is knows as-------

• Curing

• Consolidation

• Air entrainment

• Hydration