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 7, Problem 7.24QP
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 each water–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 on the 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 any discrepancies.
- 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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PART B
2.
(a) What is the criterion of failure of reinforced concrete flexural elements? What
distribution of compressive stress is normally assumed across the compression
zone of a reinforced concrete beam, and how does this compare to the actual stress
distribution?
(b) Obtain the ultimate moment of resistance of the beam section indicated in
Figure 2, if the grade of the concrete used in the section is 35N/mm?, and the
yield stress of the steel is 500N/m2
s)
750
6T20
350
ST25
6T25
200
Figure 2
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 - The design engineer specifies a concrete strength...Ch. 7 - A project specifies a concrete strength of 24.1...Ch. 7 - A project specifies a concrete strength of at...Ch. 7 - What is your recommendation for the maximum size...Ch. 7 - A concrete mix with a 3-in. slump, w/c ratio of...Ch. 7 - Prob. 7.6QPCh. 7 - You are working on a concrete mix design that...Ch. 7 - Design the concrete mix according to the following...Ch. 7 - Design the concrete mix according to the following...Ch. 7 - The design of a concrete mix requires 1173 kg/m3...
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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- Using Figure 7.34, 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). e. Compare the two relations in questions c and d and comment on any discrepancies f. Determine the toughness at each water-cement ratio and comment on the effect of increasing water-cement ratio on the toughness of concrete.arrow_forwardThe compound bar, 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: 10. A (mm?) a (°C) E (GPa) Bronze segment 2000 19.0 x 10-6 83 Aluminum segment 1400 23.0 x 10-6 70 Steel segment 800 11.7x 10-6 200 SUMMARY OF ANSWERS Овronze MPa 800 mm -500 mm- 400 mm- Oalum MPa Osteel MPa Aluminum Steel Bronzearrow_forwardSituation 5: The compound bar, 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 (mm²) a (/*C) E (GPa) Bronze segment 2000 19.0 x 10-6 83 Aluminum segrnent 1400 23.0 x 10-6 70 Steel segment 800 11.7 x 10- 200 - 500 mm→- 400 mm- 800 mm Aluminum Steel Bronze 17. Compute the stress in the bronze bar a. 31.6 MPa (T) b. 31.6 MPа (С) 18. Compute the stress in the aluminum bar. а. 45.1 MPа (Т) b. 45.1 MPa (C) 19. Compute the stress in the steel bar. 79.0MPA (T) 79.0MPA (C) 13.6 MPa (T) 13.6 MPa (C) c. d. 54.1 MPа (Т) 54.1 MPa (C) с. d. a. C. 97.0 MPa (T) b. d. 97.0 MPa (C)arrow_forward
- Pick the correct statement from the following Select one: O A. Angular and rough aggregates can increase the compressive strength of concrete significantly. O B. Abrams law state that the strength of concrete can be taken to be inversely proportional to the water/cement ratio only. O C. Changes in the structure of the interfacial transition zone can affect the compressive strength of concrete on the order of 30%. O D. The water-cement ratio is the main influencing factor on concrete total porosityarrow_forwardProblem 2: If f = 3 ksi what is the modulus of elasticity Ec and the maximum tensile stress fr that the concrete can carry before cracking (use ACI recommended equations). Assume a unit weight of the plain concrete is: a. Wc = 90- b. w lb lb 118- ft39 ft3) C. W = 160- Problem 3: Wight 3-6 Rugblom 4: Wight ? 7 lb ft3arrow_forwardNO 1 Please solve and answer correctly, give the complete solutions.arrow_forward
- 6.31 The results of a laboratory experiment to evaluate the effects of a plasticizer are shown below. a. Calculate the water/cement in each of the three cases. b. Using water reducer, how can we increase the compressive strength of con- crete without changing workability? Refer to the appropriate case in the table. 244 Chapter 6 Portland Cement, Mixing Water, and Admixtures With Water Reducer Without Water Reducer Case 1 Case 2 Case 3 Cement Content, kg/m 850 850 850 765 Water Content, kg/m Slump, mm Compressive Strength, MPa 465 465 370 419 50 100 50 50 37.8 38.0 46 37.9 c. Using water reducer, how can we improve workability without channging the compressive strength? Refer to the appropriate case in the table. d. Using water reducer, how can we reduce cost without changing workability or strength? (Assume that the cost of the small amount of water reducer added is less than the cost of cement.) Refer to the appropriate case in the table. Summarize all possible effects of water…arrow_forwardsolve the following problems 1. A concrete has a height of 5 meters and has unit area of 3 m². It supports a mass of 30,000 kg. Acceleration due to gravity (g) = 9.81 m/s². Young's modulus of concrete = 20x 10¹ N/m² Determine (a) the stress (b) the strain (c) the change in height.arrow_forward2. A standard brick ( dimensions 200mm x 100mm x 65mm) is compressed lengthwise by a force Pas shown. If the ultimate shear stress for the brick is 8MPA, that occurs at an inclination of 45° with the horizontal, and the ultimate compressive stress is 26 MPa, what is the axial deformation of the brick? Modulus of elasticity of the brick is 2.65 GPa. 200 mm 100 mm 65 mmarrow_forward
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