Materials for Civil and Construction Engineers (2nd Edition)
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ISBN: 9781292154411
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Chapter 7, Problem 7.6QP
a)
To determine
The required compressive strength of the concrete.
b)
To determine
Determine the water cement ratio.
c)
To determine
The coarse aggregate amount.
d)
To determine
The quantity of coarse aggregate if the water cement ratio is 10 % is reduced.
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Using the following data for an unreinforced PCC Pavement slab:■ Design strength f′c = 28 MPa■ Slab thickness = 300 mm■ Standard deviation of f′c obtained from 20 samples = 1.4 MPa■ Ignore any exposure requirement■ Use air-entrained concrete■ Fineness modulus of fine aggregate = 2.60■ Maximum aggregate size = 50 mm and nominal maximum aggregatesize = 37.5 mm■ Bulk oven-dry specific gravity of coarse aggregate = 2.6■ Oven-dry rodded density of coarse aggregate = 2002 kg/m3Find the following:a. Required compressive strengthb. w/c ratioc. Coarse aggregate amount (kg/m3)d. If the w/c ratio is 10% reduced, will the quantity of coarse agg
Using the following data for an unreinforced PCC Pavement slab:■ Design strength f′c = 28 MPa■ Slab thickness = 300 mm■ Standard deviation of f′c obtained from 20 samples = 1.4 MPa■ Ignore any exposure requirement■ Use air-entrained concrete■ Fineness modulus of fine aggregate = 2.60■ Maximum aggregate size = 50 mm and nominal maximum aggregatesize = 37.5 mm■ Bulk oven-dry specific gravity of coarse aggregate = 2.6■ Oven-dry rodded density of coarse aggregate = 2002 kg/m3Find the following:a. Required compressive strengthb. w/c ratioc. Coarse aggregate amount (kg/m3)d. If the w/c ratio is 10% reduced, will the quantity of coarse aggregateincrease, decrease or remain the same? Explain your answer.
Using the following data for an unreinforced PCC Pavement slab:■ Design strength f′ c = 28 MPa■ Slab thickness = 300 mm■ Standard deviation of f′ c obtained from 20 samples = 1.4 MPa■ Ignore any exposure requirement■ Use air-entrained concrete■ Fineness modulus of fine aggregate = 2.60■ Maximum aggregate size = 50 mm and nominal maximum aggregatesize = 37.5 mm■ Bulk oven-dry specific gravity of coarse aggregate = 2.6■ Oven-dry rodded density of coarse aggregate = 2002 kg/m3Find the following:a. Required compressive strengthb. w/c ratioc. Coarse aggregate amount (kg/m3)d. If the w/c ratio is 10% reduced, will the quantity of coarse aggregateincrease, decrease or remain the same? Explain your answer.
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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- Using the following data for an unreinforced PCC Pavement slab:■ Design strength f′c = 4,000 psi■ Slab thickness = 12′′■ Standard deviation of f′c obtained from 20 samples = 200 psi■ Ignore any exposure requirement■ Use air-entrained concrete■ Fineness modulus of fine aggregate = 2.60■ Maximum aggregate size = 2′′ and nominal maximum aggregatesize = 11 2′′■ Bulk oven-dry specific gravity of coarse aggregate = 2.6■ Oven-dry rodded density of coarse aggregate = 125 pcfFind the following:a. Required compressive strengthb. w/c ratioc. Coarse aggregate amount (lb/yd3)d. If the w/c ratio is 10% reduced, will the quantity of coarse aggregate increase, decrease or remain the same? Explain your answer.arrow_forward1. Following data are given for designing a Portland cement concrete mix for a nonstructural sidewalk slab: • Design strength f´c= 26 MPa• Standard deviation of f´c obtained from 25 tests=1.4 MPa• Freezing and thawing and exposed to chlorides• Use air entrained concrete• Slab thickness= 300 mm• Fineness modulus of fine aggregate=2.7• Maximum aggregate size=50 mm and nominal maximum aggregate size=37.5mm• Bulk oven-dry specific gravity of coarse aggregate=2.6• Oven-dry rodded density of coarse aggregate=2002 kg/m3• Type I cement, relative density=3.1 Find the following:a) Required compressive strength b) w/c ratio c) Coarse aggregate amount (kg/m3) d) If the w/c ratio is 10% reduced, will the quantity of coarse aggregate increase, decrease or remain the same? Explain your answer.arrow_forwardsolve for the average penetration below and after please answer. What is the relation between depth of penetration and strength of asphalt?arrow_forward
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