SCE Civil Engineering Fundamentals 1

Question 1

What is the standard concrete compressive strength test specimen used in Saudi Arabia?

Accepted Answer

150mm cube specimen tested at 28 days

Answer

Saudi Arabia follows the British Standard practice of using 150mm cube specimens for compressive strength testing at 28 days, unlike the US practice of using 6×12 inch cylinders.

Question 2

In reinforced concrete design, the purpose of minimum reinforcement is to:

Accepted Answer

Prevent sudden brittle failure when the concrete cracks

Answer

Minimum reinforcement ensures that when the concrete section cracks, the steel can carry the tensile force without sudden failure. This provides ductile behavior and warning before failure.

Question 3

The California Bearing Ratio (CBR) test is used to evaluate:

Accepted Answer

The strength of subgrade and base course materials for pavement design

Answer

The CBR test measures the resistance of a soil or aggregate to penetration, expressed as a percentage of a standard crushed stone. It is the primary input for flexible pavement thickness design.

Question 4

What is the water-cement ratio's effect on concrete strength?

Accepted Answer

Lower w/c ratio generally produces higher strength concrete

Answer

Abrams' law states that concrete strength is inversely proportional to the water-cement ratio. Lower w/c ratios produce denser, stronger concrete but reduce workability.

Question 5

The maximum allowable settlement for most structures in Saudi Arabia's sandy soils is typically:

Accepted Answer

25mm total settlement

Answer

Most building codes limit total settlement to about 25mm and differential settlement to about 20mm for conventional structures. Saudi sandy soils can have rapid settlement under loading.

SCE Engineering Practice Test

SCE Engineering Practice Test

SCE Civil Engineering Fundamentals 1