The Science and Engineering of Materials (MindTap Course List)
7th Edition
ISBN: 9781305076761
Author: Donald R. Askeland, Wendelin J. Wright
Publisher: Cengage Learning
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Which of the following statements regarding concrete is incorrect?
(a) The matrix of concrete is cement, which hardens by hydration reactions of
calcium silicates.
(b) The modulus of concrete follows an inverse law of mixtures between the
volume fracture of aggregate and the volume fraction of cement.
(c) The compressive strength of concrete develops in two stages - an initial
setting reaction, which occurs over a period of hours, and a hardening
reaction, which may continue for many months.
(d) The rate of the hardening reaction is controlled by the rate at which water
evaporates from the concrete and so the hardening reaction is temperature
dependent.
(e) The final compressive strength of concrete depends on the initial
water/cement ratio and decreases at high water/cement ratios.
What is the purpose of performing the flexure test on concrete?
The strength-density properties can be determined from bar chart. The strength
of composite can be determined from:
Tensile failure strength
Tensile tear strength
Modulus of rupture
Yield strength
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- What are the main characteristics of concrete?arrow_forwardWhat fracture surface feature is often a clue for the presence of environment-assisted cracking in polyethylene water pipe systems?arrow_forwardA continuous and aligned fiber-reinforced composite having a cross-sectional area of 1200 mm² is subjected to an external tensile load. If the stresses sustained by the fiber and matrix phases are 152 and 2.27 MPa, respectively, the force sustained by the fiber phase is 72300 N, and the total longitudinal strain is 0.00143, determine the following: (a) The force sustained by the matrix phase (in N). i (b) The modulus of elasticity of the composite material in the longitudinal direction (in GPa). i N i (c) The modulus of elasticity for the fiber phase (in GPa). GPa i GPa (d) The modulus of elasticity for the matrix phase (in GPa). GPaarrow_forward
- Which of the following will be same in both the materials in a composite body, consisting of two different materials? O a. Young's modulus O b. Strain O C. Stress and strain O d. Stressarrow_forward(a) (ii) Considering some concrete structures may fail after completion, explain the importance of routine testing the concrete batches.arrow_forwardWhat two things influence the properties of concrete masonry units?arrow_forward
- Thermoplastics are stronger than thermoset plastics. True False Yield strength, ultimate tensile strength, linear coefficient of thermal expansion, modulus of elasticity (E), proportional limit, and rupture strength are all examples of mechanical properties of engineering materials. True Falsearrow_forwardSeveral applications are listed below. Determine the relative importance of resilience and toughness of the materials chosen for each application. Sort the items based on whethere resilience is most important, toughness is most important, or both are equally importantarrow_forwardWhen a viscoelastic material is loaded and unloaded, the unloading curve is different to the loading curve, i.e. it takes more energy to displace the material than it does to return the material to its original configuration. This is known as: Select one: O a. creep O b. stress relaxation O c. hysteresis d. strain-rate dependancearrow_forward
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