Materials for Civil and Construction Engineers (4th Edition)
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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Chapter 7, Problem 7.24QP

Using Figure 7.34,

  1. a. Determine the ultimate stress at each water-cement ratio.
  2. b. Determine the secant modulus at 40% of the ultimate stress at each water–cement ratio.
  3. c. Plot the relationship between the secant moduli and the ultimate stresses.
  4. d. Plot the relationship between the moduli and the ultimate stresses on the same graph of part (c), using the relation of the ACI Building Code (Equation 7.3).
  5. e. Compare the two relations in questions c and d and comment on any discrepancies.
  6. f. Determine the toughness at each water–cement ratio and comment on the effect of increasing water–cement ratio on the toughness of concrete.
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2. The compound bar given in figure, composed of the three segments shown, is initially stress free. Compute the stress in each material if the temperature drops 25 °C. Assume that the walls do not yield and use the following data: A (mm?) a (1°C) E (GPa) Bronze segment 2000 19.0 x 10-6 83 Aluminum segment 1400 23.0 x 10-6 70 Steel segment 800 11.7 x 10-6 200 800 mm 500 mm– +400 mm→ Aluminum Steel Bronze
Using Figure 7.34,a. Determine the ultimate stress at each water–cement ratio.b. Determine the secant modulus at 40% of the ultimate stress at eachwater–cement ratio.c. Plot the relationship between the secant moduli and the ultimate stresses.d. Plot the relationship between the moduli and the ultimate stresses onthe same graph of part (c), using the relation of the ACI Building Code(Equation 7.3).e. Compare the two relations in questions c and d and comment on anydiscrepancies.f. Determine the toughness at each water–cement ratio and comment on theeffect of increasing water–cement ratio on the toughness of concrete.

Chapter 7 Solutions

Materials for Civil and Construction Engineers (4th Edition)

Ch. 7 - Prob. 7.11QPCh. 7 - Prob. 7.12QPCh. 7 - Students in the materials lab mixed concrete with...Ch. 7 - Students in the materials lab mixed concrete with...Ch. 7 - Why is it necessary to measure the air content of...Ch. 7 - What do we mean by curing concrete? What will...Ch. 7 - Discuss five different methods of concrete curing.Ch. 7 - Draw a graph showing the typical relation between...Ch. 7 - Why is extra water harmful to fresh concrete, but...Ch. 7 - Discuss the change in volume of concrete at early...Ch. 7 - Discuss the creep response of concrete structures....Ch. 7 - Prob. 7.22QPCh. 7 - On one graph, draw a sketch showing the typical...Ch. 7 - Using Figure 7.34, a. Determine the ultimate...Ch. 7 - Three concrete mixes with the same ingredients,...Ch. 7 - Three concrete mixes with the same ingredients,...Ch. 7 - Three 100 mm 200 mm concrete cylinders with water...Ch. 7 - Students in the materials class prepared three 4 ...Ch. 7 - Three 150 mm 300 mm concrete cylinders with water...Ch. 7 - Three 6 in. 12 in. concrete cylinders with water...Ch. 7 - A normal-weight concrete has an average...Ch. 7 - Discuss the significance of the compressive...Ch. 7 - What is the standard size of PCC specimens to be...Ch. 7 - Prob. 7.34QPCh. 7 - What is the purpose of performing the flexure test...Ch. 7 - What are the advantages of using a third-point...Ch. 7 - Consider a standard flexural strength specimen of...Ch. 7 - To evaluate the effect of a certain admixture on...Ch. 7 - To evaluate the effect of a certain admixture on...Ch. 7 - Prob. 7.40QPCh. 7 - Prob. 7.41QPCh. 7 - A normal-weight concrete has an average...Ch. 7 - Three batches of concrete were prepared using the...Ch. 7 - Three batches of concrete were prepared using the...Ch. 7 - Prob. 7.45QPCh. 7 - Prob. 7.46QPCh. 7 - Discuss two nondestructive tests to be performed...Ch. 7 - Discuss the concept of concrete maturity meters.Ch. 7 - Discuss four alternatives that increase the use...Ch. 7 - What is self-consolidating concrete? How are its...Ch. 7 - Prob. 7.51QPCh. 7 - Two 6 in. 12 in. concrete cylinders with randomly...Ch. 7 - Discuss the concept of high-performance concrete....Ch. 7 - Comparing PCC with mild steel, answer the...Ch. 7 - Prob. 7.55QP
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