Materials for Civil and Construction Engineers (2nd Edition)
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ISBN: 9781292154411
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Chapter 7, Problem 7.40QP
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.
The third-point loading flexure strength test was 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 load at failure was 35.7 kN, calculate the flexure strength of the concrete
The center-point loading flexure strength test was performed on a concrete beam having a cross section of 4 in. by 4 in. and a span of 8 in. If the load at failure was 5,000 lb, calculate the flexure strength of the concrete.
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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- A 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_forwardThe third-point loading flexure strength test was 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 load at failure was 35.7 kN, calculate the flexure strength of the concrete. This normal-weight concrete has an average compressive strength of 20 MPa. What is the estimated flexure strength (hints: use the ACl equation)?arrow_forwardA concrete specimen with b = d is supported at both ends 600mm apart. It is tested for flexure strength with load at midspan of 100kN and failed with a flexural stress of 52.083 MPa. What is the dimension b and d of the specimen in mm?arrow_forward
- 100mm diameter cylindrical concrete specimen was tested for compressive strength. The sample failed when a maximum applied force was 200,000N. What is the stress at failure of the specimen in MPa?arrow_forwardThe specified concrete strength for a new building is 5000 psi. Calculate the required average for the concrete (a) if there are no prior test results for concrete with a compressive strength within 1000 psi of made with similar materials, (b) if 20 test results for concrete with made with similar materials produce a sample standard deviation ss of 560 psi, and (c) if 30 tests with made with similar materials produce a sample standard deviation ss of 540 psi.arrow_forwardA hardened concrete cylinder is tested in compression. The ultimate compressive load measured in the laboratory is 262.5 kN. If the sample is 101.3 mm in diameter, calculate the compressive strength in MPa. Round answer to 3 significant digitsarrow_forward
- A normal-weight concrete test beam 150mm by 150mm in cross section and supported on a simple span of 600mm. was loaded with a point load at midspan. The beam failed at a load of 9kN. Using this information, Determine the modulus of rupture fr of the concrete.arrow_forward8. A center-point loading flexural test was performed on a concrete beam having a size of 100×100×500 mm. The beam is sitting on two supports located at 25 mm from each edge of beam. If the failure load was 17.5 kN, find the flexural strength.9. Considering the two tests of flexure, 3-points and 4-points, which one is more suitable for bending test and why?10. The compression strength test was performed on several samples of concrete molded in four types of molds cubes of 0.100 m×0.100 m ×0.100 m and of 0.150 m×0.150 m × 0.150 m, and cylinders having a cross section of d=100 mm by H=200 mm and d=150 mm by H=300 mm, respectively. If the weight of the samples and the loads at failure are as given in the Table. Both cubes and cylinder samples are cast from the same concrete batch under the same conditions and subjected to the same curing method.arrow_forwardThe specified concrete strength for a bridge is 5500 psi. You have 25 test results for the same concrete from the similar project with the sample standard deviation psi. Calculate the required average strength .arrow_forward
- A concrete test cylinder is tested in compression after 7 days of moist curing. If the strength is 22.5 MPa, what do you predict for the projected 28-day strength knowing that the sample only gain 80% strength at 7 days?arrow_forward8. A center-point loading flexural test was performed on a concrete beam having a size of100×100×500 mm. The beam is sitting on two supports located at 25 mm from each edge ofbeam. If the failure load was 17.5 kN, find the flexural strength.arrow_forwardA 150mm diameter cylindrical concrete specimen was tested for compressive strength. What would be the maximum applied force in kN when the stress at failure is 41.4 MPa?arrow_forward
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