d) Briefly explain three techniques that are used to strengthen concrete by reinforcemente) For a polymer-matrix fiber-reinforced composite:i. List three functions of the matrix phase.ii. Compare the desired mechanical characteristics of matrix and fiber phases.i. Cite two reasons why there must be a strong bond between fiber and matrix attheir interface.

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Answered: d) Briefly explain three techniques…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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What is the weakest property of concrete? The compressive strength of the coarse aggregate The compressive strength of the cement paste The bond between the cement paste and the aggregate The shear strength of the coarse aggregate
A FRP composite includes 47% continuous and aligned Aramid fibers by volume. The moduli of elasticity of the Aramid fibers and the epoxy resin matrix are 19 * 106 psi and 0.6 * 106 psi, respectively.a. Compute the modulus of elasticity of the composite in the longitudinal and transverse directions.b. If the composite cross-sectional area is 0.5 in.2 and a stress of 12 ksi is applied in the longitudinal direction, compute the load carried by the fibers and the matrix.c. Determine the strain sustained by each of the phases when stress in part(b) is applied.
y=82 show complete solutions
IV- It is necessary to design a continuous and aligned glass fiber-reinforced polyester having a tensile strength of at least 1400 MPa in the longitudinal direction. The maximum possible specific gravity is 1.65. Using the following data, determine whether such a composite is possible. Justify. Assume a value of 15 MPa for the stress on the matrix when the fibers fail. Material Glass fiber Polyester Specific gravity 2.5 1.35 Tensile strength (MPa) 3500 50
Determine the y-bar centroid of the composite figure shown. Where: y = 18mm and x = 9 mmShow your solution and round off if possible
The bond strength for M20 concrete as per IS 456: 2000 is 1.2 N/mm2. For reinforcing steel of grade Fe 360, the development length in terms of bar diameter (o) is
Compare the desired properties of the matrix and the fiber phases of the fiber reinforced composite.
The permissible bending compressive strength for M 25 grade of concrete is 8.5 N/mm². Its short-term and long-term modular ratios are, nearly
The first parts of the stress-strain relationships of the components of a randomly oriented composite are shown in Figure P11.25. Estimate the volume percentage of fibers in the composite assuming a fiber efficiency parameter (K) of 0.2. Stress (MPa) 1400 1200 1000 800 600 400 200 I T FIGURE P11.25 0.002 Fibers Strain (m/m) 0.004 Composite Matrix 0.006
Aggregates used to make concrete could be Gravel or Crushed stone or even recycled Aggregates. Select one: O True O False Lowering the w/c ratio of concrete lead to an increase of the strength but reduces the workability and tendency to segregation and bleeding. Select one: O True O False
For a continuous and oriented fiber-reinforced composite, the moduli of elasticity in the longitudinal and transverse directions are 19.7 and 3.66 GPa (2.8x10 and 5.3x 105 psi), respectively. If the volume fraction of fibers is 0.42, determine the moduli of elasticity of fiber and matrix phases. Em- E₁= i GPa GPa
Explain Particle-reinforced composites in brief.

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