Materials for Civil and Construction Engineers (4th Edition)
4th Edition
ISBN: 9780134320533
Author: Michael S. Mamlouk, John P. Zaniewski
Publisher: PEARSON

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Textbook Question
Chapter 11, Problem 11.15QP

Three 6 in. × 12 in. concrete cylinders with randomly oriented steel fiber contents of 0, 2, and 3% by weight, respectively. After curing for 28 days, the specimens were subjected to increments of compressive loads until failure. The load versus deformation results were as shown in Table P11.15.

Assuming that the gauge length is the whole specimen height, determine the following:

a. The compressive stresses and strains for each specimen at each load increment.

b. Plot stresses versus strains for all specimens on one graph.

c. The modulus of elasticity for each specimen.

d. The ultimate strength for each specimen.

e. The strain at failure for each specimen.

f. Toughness. Curves may be approximated with a series of straight lines.

g. Comment on the effects of increasing the fiber content on the following:

i. Modulus of elasticity

ii. Ultimate strength

iii. Ductility

iv. Toughness

12:33
Students have asked these similar questions
Two 150 mm * 300 mm concrete cylinders with randomly oriented steelfiber contents of 0 and 2% by weight, respectively. After curing for 28 days,the specimens were subjected to increments of compressive loads until failure. The load versus deformation results were as shown in Table P7.45. Assuming that the gauge length is the whole specimen height, determine the following:a. The compressive stresses and strains for each specimen at each loadincrement.b. Plot stresses versus strains for the two specimens on one graph.c. The initial modulus of elasticity for each specimen.d. The ultimate strength for each specimen.e. The strain at failure for each specimen.f. Toughness. Curves may be approximated with a series of straight lines.g. Comment on the effect of adding fiber on the following:i. Modulus of elasticityii. Ultimate strengthiii. Ductilityiv. Toughness
Which strain and stress profiles shown in the figure below best represent a reinforced concrete section subjected to flexure at the ultimate limit state?
A concrete test cylinder with a cross-sectional area of 28.3 in squared is to be tested in axial compression. Before loading two marks are scribed on the cylinder precisely 8 in apart (as shown in the figure below) when the load is 40,000 lb the marks are measured and found to be 7.997 in apart determine the E value for this concrete. Assume an approximately linear relationship between stress and strain.

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