Materials for Civil and Construction Engineers (2nd Edition)
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ISBN: 9781292154411
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Chapter 6, Problem 6.13QP
The water–cement ratio is important because it influences all of the desirable qualities of concrete.
a. Referring to Figure 5.10, which portion of water is used to calculate the water–cement ratio?
b. What is a typical water–cement ratio for normal strength concrete?
c. What is the water–cement ratio needed for hydration only when concrete is in the plastic state?
d. Why is the extra water necessary?
e. Briefly describe how super high strength concrete (fc′ = 15,000 psi) can be made.
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The water–cement ratio is important because it influences all of the desirable qualities of concrete.
a. Referring to Figure 6.10, which portion of water is used to calculate the water–cement ratio?b. What is a typical water–cement ratio for normal strength concrete?c.What is the water–cement ratio needed for hydration only when concrete is in the plastic state?d.Why is the extra water necessary?e.Briefly describe how super high strength concrete (fc′=15,000 psi) can be made.
The water–cement ratio is important because it influences all of the desirablequalities of concrete.a. Referring to Figure 5.10, which portion of water is used to calculate thewater–cement ratio?b. What is a typical water–cement ratio for normal strength concrete?c. What is the water–cement ratio needed for hydration only when concreteis in the plastic state?d. Why is the extra water necessary?e. Briefly describe how super high strength concrete (fc′ = 15,000 psi) canbe made.
What is the effect of water–cement ratio on the permeability of hardened concrete? How does permeability affect the durability of the concrete structure?Using Figure , what is the approximate percent increase in the coefficient of permeability if the water–cement ratio increases from 0.5 to 0.6? Using the same figure, what is the approximate percent increase in the coefficient of permeability if the water–cement ratio increases from 0.5 to 0.7?
Chapter 6 Solutions
Materials for Civil and Construction Engineers (2nd Edition)
Ch. 6 - What ingredients are used for the production of...Ch. 6 - What is the role of gypsum in the production of...Ch. 6 - What is a typical value for the fineness of...Ch. 6 - What are the primary chemical reactions during the...Ch. 6 - Define the C-S-H phase of cement paste.Ch. 6 - What are the four main chemical compounds in...Ch. 6 - Prob. 6.7QPCh. 6 - Define a. interlayer hydration space b. capillary...Ch. 6 - Prob. 6.9QPCh. 6 - The following laboratory tests are performed: a....
Ch. 6 - What is a false set of portland cement? State one...Ch. 6 - The watercement ratio is important because it...Ch. 6 - Discuss the effect of watercement ratio on the...Ch. 6 - Draw a graph to show the general relationship...Ch. 6 - Students in the materials class prepared three...Ch. 6 - Students in the materials class prepared three...Ch. 6 - Two batches of cement mortar with properties as...Ch. 6 - What are the five primary types and functions of...Ch. 6 - Why isnt pozzolan used with Type III cement?Ch. 6 - What type of cement would you use in each of the...Ch. 6 - In order to evaluate the suitability of nonpotable...Ch. 6 - Three standard mortar cubes were made using...Ch. 6 - Four standard mortar cubes were made using...Ch. 6 - Discuss the problem of disposal of waste water...Ch. 6 - State five types of admixtures and discuss their...Ch. 6 - Prob. 6.27QPCh. 6 - Under what condition is an air-entraining agent...Ch. 6 - If a water reducer is added to the concrete mix...Ch. 6 - Prob. 6.30QPCh. 6 - A concrete mix includes the following ingredients...Ch. 6 - The results of an experiment to evaluate the...Ch. 6 - The results of a laboratory experiment to evaluate...Ch. 6 - Referring to Table P6.34, Mix No. 1 was designed...Ch. 6 - Two batches of concrete cylinders were made with...Ch. 6 - Two batches of concrete cylinders were made with...Ch. 6 - What is the source of fly ash? Why is fly ash...Ch. 6 - A materials engineer is working in a research...Ch. 6 - A materials engineer is working in a research...
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