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 7.40QP
To determine
The flexural strength of the beam.
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A 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?
A center point loading is used to test concrete for flexure. The sample is 150mm x 150mm and has a clear span of 600mm. The sample failed when the load applied is 100,000N. What is the flexure stress at failure in MPa?
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 (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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- The maximum applied load on a cylindrical concrete specimen of diameter 150 mm and length 300 mm tested as per the split tensile strength test guidelines of IS 5816:1999 is 157 kN. The split tensile strength (in MPa, (round off to three decimal place) of the specimen isarrow_forwardwhat 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. 30.6 MPa c. 31.6 MPa d. 30.1 MPaarrow_forwardThe third-point loading flexure strength test was performed on a IVI ... 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 ACI equation)?arrow_forward
- 7. The third-point loading flexure strength test was performed on a concrete beam having a cross section of 150 mm by 150 mm and a span of 450 mm. If the load at failure was 35.7 kN, calculate the flexural strength of this concrete.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_forwardQ- The maximum applied load on a cylindrical concrete specimen of diameter 150 mm and length 300 mm tested as per the split tensile strength test guidelines of IS 5816:1999 is 157 kN. The split tensile strength (in MPa, round off to one decimal place) of the specimen is?arrow_forward
- a concrete column base is circular, with a diameter of 8 in, and carries a direct compressive load of 70000 lb. compute the compressive stress in the concretearrow_forwardA cylindrical block of concrete is 300mm long and has a circular cross section of 100mm in diameter. It carries a total compressive load of 67KN and under this load contract 0.2mm. Estimate the compressive stress and strain .arrow_forward4.1 Consider the prestressed concrete beam and prestressing steel stress-strain diagram given below. The concrete is assumed to have an ultimate strain capacity of 0.003 in/in. Determine the nominal strength of the member using the strain compatibility method. It should be noted that the stress-strain diagram below allows virtually "exact" calculation of stresses and strains in the prestressing steel. Assume that the specified concrete strength is 4,000 psi, fse = 137 ksi, Ec = 3850 ksi, Ecu = 0.003, p = 0.40 and Eps = 28,000 ksi. 20" 4" 3" -10" O -10" (a) 17.58" Ap = 0.575 in.2 fp ksi 250 213 0.0079 Ep (b) 0.067arrow_forward
- Determine the tensile steel ratio of a singly reinforced concrete beam for the following conditions using concrete strength f'c = 21 MPa and steel yield strength fy = 420 MPa a.) if the tensile strain is es = fy/Es upon crushing of concrete at a strain of 0.003 b.) if the tensioe strain is set as 0.009 upon crushing of concrete at strain of 0.003 c.) minimum as required by NSCP 2015arrow_forwardDetermine the tensile steel ratio of a singly reinforced concrete beam for the following conditions using concrete strength f’c = 21 MPa and steel yield strength fy = 420 MPa. if the tensile strain is set as 0.009 upon crushing of concrete at a strain of 0.003. = [rr] (5 decimal places)arrow_forwardA 150mm x 150mm concrete specimen was tested for flexure strength over a span of 600mm. The load at midspan causes a flexure strength of 41.4 MPa. What was the maximum applied load in kN?arrow_forward
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