Components of Concrete ─ Water and Aggregates

The major components of concrete

• Cement

  small rocks

  aggregates

• Cement

    Water

    Aggregates

    Mineral Admixture

    Chemical Admixture

• Cement

    Water

    Aggregates

    Fly ash

    Chemical Admixture

• Cement bituminous

  lime and water in proper proportions

Gravel is ...

• fine aggregate

• coarse aggregate

• plasticizer

• retarder

The material combined with cement and water to make concrete is called aggregate. Aggregate makes up __________ percent of concrete volume. It increases the strength of concrete, reduces the shrinking tendencies of the cement, and is used as economical filler.

• 30 to 50

• 5 to 20

• 60 to 80

• 80 to 100

A popout happens when:

• The concrete is struck by a blunt object by accident

• When internal pressure causes a small part of the concrete surface to break away

• It is a normal wear and tear of the concrete

The principal function/s of water in a concrete mix is/are

• to effect hydration

• to improve workability

• None of the above

• All of the above

The aggregate shape that increases the void volume, hard to case and less workable

• Round aggregate

• Angular aggregate

the following process causes pop outs and cracking

• Hydration

• Alkali-Silica Reactivity

• Reaction ofC₃S with water

• Formation of C-S-H

The minimum percentage of compressive strength at 7 days of concrete with questionable water supply to the control should be

• 90 %

• 80 %

• 75 %

• 60%