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 7.35QP
What is the purpose of performing the flexure test on concrete? How are the results of this test related to the compressive strength test results?
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Students have asked these similar questions
2. What is the standard size of PCC specimens to be tested for compressive strength? If a
smaller size is used, which size is expected to provide higher compressive strengths?
Why? Which size provides strengths close to that of an actual concrete structure?
3. What is the purpose of performing the flexure test on concrete? How are the results of
this test related to the compressive strength test results?
4. What are the advantages of using a third-point loading flexure test over a center-point
loading flexure test? Draw a shear force diagram and a bending moment diagram for each
case to support your answer.
As per NSCP 2015, what is the maximum permissible concrete strain?
Select one:
a. 0.002
b. 0.005
c. 0.003
d. 0.007
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 MPa
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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- What is Physical test in cement? elaborate/discussarrow_forward4. Please discuss the Poisson's ratio of concrete in terms of compressive strength. Is there an equation to connect the two quantities? If yes, What are the physical bases of the equation?arrow_forwardWhat happens if any concrete cube fails in 28 days compressive strength test?arrow_forward
- What is the compressive strength of Concrete if a 6" cylindrical sample was tested in UTM and failed at 640 kN load? о 35 MPа о 28.5 MPа o 28 MPa o 30 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_forward13. Test method used to check compressive strength of concrete on sitearrow_forward
- Write discussion about Compressive strength of cube and Cylinder concrete specimens.arrow_forwardWrite three aggregate properties that affect compressive strength of concrete.arrow_forwardPlease perform an experiment and provide a report on Rebound Number of Hardened Concrete and cover the following details - ASTM Designation Purpose Significance and Use Apparatus Test Procedure Test Conditions Reportarrow_forward
- Concrete Compressive Strength test Discussion: 1.Why did you use three samples?2. What changes do you need to apply if you were to use three standard cube samples instead?(reference needed)3. According to the relevant Australian Standards, what is the acceptable tolerance for yourtarget strength and target workability? (reference the standard clause you have used to answer the question). In what range should the values of your compressive test and slumpresults be to be deemed acceptable?arrow_forwardExplain why we need to use the smooth surface of the cubes for compressive strength testing. What would be the strength reading if you have used cylinders instead? 6. Discuss the correlation of UPV in terms of compressive strength anf concrete quality? 7. Discuss possible errors leading to unsatisfactory results. What are the modifications that might help to resolve these errors? 8. In your own words, explain your observations on how w/c, admixtures and puzzolans influenced the strength of concretearrow_forwardDescribe the difficulty of designing a concrete mixture and the necessity of compressive strength.arrow_forward
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