Materials for Civil and Construction Engineers (2nd Edition)
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ISBN: 9781292154411
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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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Using Figure 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.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.
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.
On one graph, draw a sketch showing the typical relationship between the stress and strain of concrete specimens with high and low water–cement ratios. Label all axes and curves. Comment on the effect of increasing the water–cement ratio on the stress–strain response.
Chapter 7 Solutions
Materials for Civil and Construction Engineers (2nd 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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- 150 mm * 300 mm concrete cylinders were made of the same batch and sepa- rated at random to six equal groups. The six groups of cylinders were sub- merged in water for different times before testing for compressive strength and the results are shown in Table P7.39. It is required to do the following: a. Determine the compressive strength at different curing times. b. Using an Excel sheet, plot the relationship between curing time and compressive strength. Label all axes and curves. c. Comment on the effect of curing time on the compressive strength. d. What is the approximate ratio between the compressive strengths at 7 days and 28 days? e. What is the approximate ratio between the compressive strengths at 28 days and 180 days?arrow_forwardSCC and Plain Concrete Why does the unit weight decrease as the slump increases?arrow_forwardThe results of an experiment to evaluate the effects of a water reducer areshown in Table P6.32.a. Calculate the water–cement ratio in each of the three cases.b. Using water reducer, how can we increase the compressive strength ofconcrete without changing workability? Refer to the appropriate case inthe table.c. Using water reducer, how can we improve workability without changingthe compressive strength? Refer to the appropriate case in the table.d. Using water reducer, how can we reduce cost without changingworkability or strength? (Assume that the cost of the small amountof water reducer added is less than the cost of cement.) Refer to theappropriate case in the table.e. Summarize all possible effects of water reducers on concrete.arrow_forward
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