Building Tech - Div. 3 Concrete

An artificial, stonelike building material made by mixing cement and various mineral aggregates with sufficient water to cause the cement to set and bind the entire mass.

• Cement

• Reinforced Concrete

• Concrete

• Natural Cement

A hydraulic cement made by burning a mixture of clay and limestone in a rotary kiln and pulverizing the resulting clinker into a very fine powder.

• Portland Cement

• Natural Cement

• Hydraulic Cement

• Fly Ash

Joseph Aspdin patented an artificial cement he named "Portland Cement". What year?

• 1884

• 1824

• 1796

• 1832

Density of an unreinforced concrete

• 500 kg/m3

• 7,850 kg/m3

• 2,000 kg/m3

• 2,400 kg/m3

Answer explanation

Wood = 500 kg/m3

Brick Masonry = 2,000 kg/m3

Structural Steel = 7,850 k/m3

Concrete (unreinforced) = 2,400 kg/m3

What type of portland cement is employed in the construction of massive concrete structures such as gravity dams?

• Type I: Normal

• Type II: Moderate

• Type III: High Early Strength

• Type IV: Low Heat

• Type V: Sulfate Resistant

What type of portland cement that is used in contact with water with sulfate present?

• Type I: Normal

• Type II: Moderate

• Type III: High Early Strength

• Type IV: Low Heat

• Type V: Sulfate-Resistant

The inherent strength of concrete depends on the quality of its?

• Water

• Admixture

• Aggregate

• Cement

Answer explanation

Comparative Strength - proportioning / mixture of water (Water Cement Ratio)

Inherent Strength - base on types of aggregates (Quality)

Aggregate having a particle size distribution characterized by uniform grading.

• Uniform Grading

• Coarse Aggregate

• Graded Aggregate

• Fine Aggregate

Aggregate consisting of sand having a particle size smaller than 1/4 in. (6.4 mm)

• Fine Aggregate

• Coarse Aggregate

• Graded Aggregate

• Particle size distribution

An Admixture that slows the setting of a concrete, mortar or plaster mix in order to allow more time for placing and working the mix.

• Air-entraining agent

• Accelerator

• Retartder

• Surface-Active Agent