Question

In: Civil Engineering

Please answer all 4 questions. Thank you! 1) What are the 2 primary differences between FRP...

Please answer all 4 questions. Thank you!

1) What are the 2 primary differences between FRP and FRC re: stress-strain behavior of components?

2) What types of glass fiber are best to use in FRC?

3) How does cement matrix bond to fibers versus bonding to aggregate re: interface zone?

4) Which of the types of bonding (elastic bonding, frictional bonding, mechanically bonding) between fibers and cementitious matrix is most important for glass fibers and for steel fibers?

Expert Solution

Answer (1):

Composite Fibre Reinforced Concrete (FRC) -

Brittle matrix composite theory is applicable.
Many FRC materials retain some strength after reaching peak stress point.
Strain to failure greater than 1 percentage
Pseudo ductility or toughness greater than plain cement matrix

Fibre Reinforced Polymer (FRP)

Laminate composite behaviour theory is applicable.
Lightness and corrosion resistance (polymer property).
Strength and stiffness ( fibre property)

Answer (2):

Best glass fibres to be used in FRC:

Low volume contents of AR-13 glass fibre
Cem- Fil HP Glass fibre increase flexural strength and toughness
E-glass has high flexural strength
S2 - glass has high tensile strength

Answer (3)

Initial interface between fibre and matrix is loose and porous. As matrix hydrates, interface becomes denser and the spaces get filled with various hydration product like calcium hydroxide crystals.

The stress is transferred from matrix to fibres in two ways:

At early stages of loading, stress is transmitted through an elastic shear transfer mechanism to the fibre.
After initial cracking, frictional slip becomes the factor to transfer stress. The degree of frictional slip influence ultimate strength and strain of fibre reinforcement.

Answer (4)

Frictional bonding dominates the stress strain behaviour of fibre reinforced concrete. Thus frictional bonding is of main interest.

Elastic bonding makes the fibre adhere to matrix.
Frictional bonding provides resistance to pullout.
Mechanical bonding interlock fibre to matrix.

REFERENCES

"Construction Materials: Their Nature and Behaviour, Fifth Edition" by Marios Soutsos, Peter Domone
"Concrete Construction Engineering Handbook" by Edward G. Nawy

Ally Wells answered 1 year ago

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