Concretes have several properties. Which one of the following statements is incorrect? a. Concretes have good tensile strength b. Concretes have good shear strength c. Concretes have good compressive strength d. Concretes have good wear resistance

Concretes have several properties. Which one of the following statements is incorrect? a. Concretes have good tensile strength b. Concretes have good shear strength c. Concretes have good compressive strength d. Concretes have good wear resistance

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter12: Composite Materials

Section: Chapter Questions

Problem 12.6P

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Concept explainers

Types of Composite

Composite materials are formed by merging two components that have different chemical and physical properties. The merged output is termed as a composite, whose properties are completely different from the individual components. Composite materials also have better strength than the individual components.Composite materials usually have two main parts, reinforcement material, and matrix material. The matrix material acts as a binder and surrounds the fiber of another material that bears a much higher strength. This material is known as the reinforcement material. The matrix materials are usually high-strength additives resins, while the fibers of the reinforced material can be random, oriented, and in a mat format.Composite materials are also known as fiber-reinforced composite polymers because they are composed of the polymer matrix which is reinforced to laboratory-created fibers or naturally occurring fibers, such as glass fibers, carbon fibers, or aramid fibers. Under the application of external loads, the matrix material absorbs and transfers the loads to the fibers, these fibers in return provide good compressive strength, tensile strength, and stiffness to the fiber-reinforced composite materials.Depending upon the matrix and the reinforcement material, different properties can be induced to the fiber-reinforced composite materials, including good corrosion resistance properties. The most common matrix material is the resin while the glass fibers act as the reinforcement material. Strong fibers provide strength and stiffness to the composite materials while, a soft and flexible resin provides shape to the composite materials.

Question

Concretes have several properties. Which one of the following statements is
incorrect?
a. Concretes have good tensile strength
b. Concretes have good shear strength
c. Concretes have good compressive strength
d. Concretes have good wear resistance

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A reinforced concrete beam of rectangular section has the cross-sectional dimensions shown in the figure below. The concrete of normal density has a compressive strength of 30 MPa and a modulus of rupture of 3.3 MPa. The yield strength of steel is 400 MPa. a) Calculate the stress due to an applied bending moment of 45 kN-m b) Calculate the bending moment at which cracking of concrete will be initiated (cracking moment Mcr) h=600 mm b=300 mm 키 As-2000 mm 4- No 25 d=530 mm
A. What are the primary and secondary parameters upon which durability of concrete depends on? Discuss in detail one PRIMARY PARAMETER to which concrete is exposed in the image shown: *
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It is common to assume that reinforced concrete has a unit weight of 150 lb/ft3. If plain concrete has a unit weight of 145 lb/ft3, what percent of the volume of reinforced concrete is assumed to be reinforcing steel?
Estimate the transverse tensile strength of the concrete in Problem 12.6.
(a) In general, which provides better fire performance, carbonate or silicate aggregates? Why? (b) Why does fire design incorporate a load reduction factor (Dfire) = 1.0? (c) Two identical beams (Beam 1 is simply supported, and Beam 2 is fully restrained) are heated under similar conditions. What does the mechanical strain equal to in each of these beams? (d) A design office located in Clemson, SC (with a branch in San Francisco, CA) envisions designing a new composite member made of steel and timber. This to-be designed member is expected to be used in wildfire-prone regions primarily for single family homes. Comment on how you would design such a member to achieve superior fire performance. (e) Plot and discuss the expected degradation faces in three bending elements (say, beams) to be made from concrete, steel and timber?
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Subject is properties of behavior
F 1. The "slump" test is used to determine the compressive strength of a concrete. (F) 2. For room temperature and axial loadingaluminum behaves as a brittle material. T. T 3. Proper curing is important for a concrete specimen to gain compressive strength. T. (F 4. Concrete usually has a good tensile strength. T F 5. The units of the modulus of elasticity are the same as for axial stress. T F 6. Plasticity is characterized by return of a ħaterial to original size & shape upon removal of stress. т F 7. Strain hardening increases the elastic strength of the material. T F 8. Some materials do not exhibit a well defined yield point. T F 9. The failure behavior of our aluminum specimen in our torsion test was expected. T F 10. Necking of a steel specimen loaded in tension is an example of Poisson's ratio.
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