Week 8

What is/are the protection mechanisms of fusion bonded epoxy coated (FBEC) bars?

• Formation of good passive film

• Reduction in open potential

• Eliminates direct physical contact between metal and concrete

• Acts as a sacrificial layer for the steel

Arrange the FBE coating process in the sequential order:

• Cleaning and heating > Blasting> lonizing epoxy resin Water quenching > Inspection of holidays

• Cleaning and heating > Blasting > Water quenching Ionizing epoxy resin > Inspection of holidays

• Blasting > Cleaning and heating > lonizing epoxy resin Water quenching > Inspection of holidays

• Blasting Cleaning and heating > Water quenching lonizing epoxy resin > Inspection of holidays

State true or false: FBEC bars should not be bent at the site and must be bent before the coating:

• True

• False

Using FBEC steel rebars is one of the methods to prevent corrosion if implemented adequately. Which of the following is the correct order of practice to follow while using FBEC steel rebars for construction?

• (iii)-(v)-(1)-(vi)

• (i)-(iii)-(vi)-(iv)-(v)-(ii)

• (iv)-(iii)-(vi)-(ii)-(v)

• (iv)-(i)-(vi)-(ii)-(v)

Select the appropriate option regarding hot-dipped galvanized steel reinforcement.

• Less abrasion resistant than the non-metallic coating

• Special handling is required during construction

• Typically, it has two layers of iron-zinc alloy layers

• Along the radius of the bar, zinc concentration decreases

Match the following chemicals with their effects on rebar properties:

• A-ii, B-iii, C-iv, D-i

• A - iv B- iii, C-ii, D-i

• A-ii, B-i, C- iv, D-iii

• A - i, B - i, C - iii, D - iv

State true or false:

The typical strength of prestressing steel strands is 4.5 times the normal steel, and it is generally used for long-span construction

• True

• False

The simply supported beam has a concentrated load at center W (the material A used for the beam is steel, and B is aluminum). Calculate the % increase in deflection in aluminum compared to steel E vvecl =200 and E Ahumman = 50GPa .

• 300

• 300