EBK MATERIALS FOR CIVIL AND CONSTRUCTIO
4th Edition
ISBN: 8220102719569
Author: ZANIEWSKI
Publisher: PEARSON
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Chapter 7, Problem 7.41QP
To determine
The flexural strength of the beam.
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A center-point loading flexural test was performed on a concrete beam with a cross section of4 in. * 4 in. and a span of 8 in. If the failure load was 5,000 lb, find the flexure strength.
A center-point loading flexural test was performed on a concrete beam with a cross section of 100 mm * 100 mm and a span of 200 mm. If the failure load was 26.9 kN, find the flexure strength.
A flexure strength tests were performed on a concrete beam having a cross section of 0.15 m by 0.15 m and a span of 0.45 m. If the total load at failure was 37.5 kN, calculate the following:
a. The flexure strength of the concrete if center-point loading was applied.
b. The flexure strength of the concrete if third-point loading was applied.
c. Which of the two flexural tests is recommended in determining the flexure strength of the concrete and why?
Chapter 7 Solutions
EBK MATERIALS FOR CIVIL AND CONSTRUCTIO
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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- A center-point loading flexural test was performed on a concrete beam with across section of and a span of 8 in. Ifthe failure load was 5,000 lb,find the flexure strength.arrow_forwardA flexure strength tests were performed on a concrete beam having a cross section of 0.15x0.15m and a span of 0.45m. If the total load at failure was 37.5kN, calculate the ff:a. The flexure strength of the concrete if center-point was applied.b. The flexure strength of the concrete if third-point was applied.c. Which of the two flexural tests is recommended in determining the flexure strength of the concrete and why?arrow_forwardA third-point loading flexural (bending) test was performed on a concrete beam with a cross section of 4 in. × 4 in, and a span of 8 in. If the failure load was 6,000 lb, find the modulus of rupture in psi.arrow_forward
- What would be the average compressive strength of concrete if the load at failure of the 3 trials are 55, 100 kg, 54, 800 kg, and 55, 200 kg. Diameter of the sample is 6”. a 31.1 MPa b 30.1 MPa c 30.6 MPa d 30.6 MPaarrow_forwardA normal-weight concrete specimen tested at 28 days yielded the following results: (a) A 6 in. (diameter) x 12 in. (height) concrete cylinder failed at an axial compressive force of 105,000 Ibf. How much is the ultimate compressive strength? (b) A 6 in. square unreinforced beam section failed at a force of 5400 Ibf on a 21 in. span length. A third-point loading test was used, and the fracture occurred within the middle third. How much is modulus of rupture? (c) What is the ratio of the modulus of rupture in (b) to the compressive strength in (a)? (d) Use the compressive strength in (a) to calculate the approximate value of the modulus of rupture per ACI318-19. What is the ratio of your result here to the value in (b)? What conclusion can you make here?arrow_forwardA third-point loading flexural (bending) test was performed on a concrete beam with a cross-section of 4 in. x 4 in. and a span of 8 in. If the failure load was 6,000 lb, find the modulus of rupture in psiarrow_forward
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