Construction Materials and Testing - Module 4 Part 1

Cement paste – mix of cement powder and water.

• True

• False

False set - the stiffening of a concrete mixture with little evidence of significant heat generation.

• False

• True

Hydration - the chemical reaction that takes place when Portland cement and water are mixed together. The hydration reaction is considered complete at 28 days.

• True

• False

Mortar – mix of cement powder, water and sand.

• True

• False

Water-Cement Ratio - the ratio by weight between water and cement used to make paste. The water-cement ratio should be the lowest value required to meet the design considerations.

• False

• True

Any material that can be made plastic and that gradually hardens to form an artificial stonelike substance is called a cementitious material.

• True

• False

Cement is a commonly used as binding material in the construction industry.

• False

• True

Pozzolan Cement: According to ACI, a pozzolan is a siliceous or siliceous and aluminous material.

• True

• False

Pozzolan Cement: It possesses little or no cementitious value but will, in finely divided form and in the presence of moisture, chemically react with calcium hydroxide at ordinary temperatures

• False

• True

Pozzolan Cement: There are both natural and artificial (fly ash, and silica fume) pozzolans.

• False

• True