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 6, Problem 6.32QP
The results of an experiment to evaluate the effects of a water reducer are shown in Table P6.32.
a. Calculate the water–cement ratio in each of the three cases.
b. Using water reducer, how can we increase the compressive strength of concrete without changing workability? Refer to the appropriate case in the table.
c. Using water reducer, how can we improve workability without changing the compressive strength? Refer to the appropriate case in the table.
d. Using water reducer, how can we reduce cost without changing workability or strength? (Assume that the cost of the small amount of water reducer added is less than the cost of cement.) Refer to the appropriate case in the table.
e. Summarize all possible effects of water reducers on concrete.
*Assume that the water content is above the saturated surface-dry (SSD) condition of the aggregate.
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Students have asked these similar questions
The results of a laboratory experiment to evaluate the effects of a plasticizer
are shown below.
a. Calculate the water-cement ratio in each of the three cases.
b. Using water reducer, how can we increase the compressive strength of
concrete without changing workability? Refer to the appropriate case in
Table P6.32.
c. Using water reducer, how can we improve workability without changing
the compressive strength? Refer to the appropriate case in the table.
TABLE P6.32
With Water Reducer
Without Water Reducer
Case 1 Case 2 Case 3
Cement content, kg/m³
815
815
815
734
Water content,* kg/m³
446
446
355
402
Slump, mm
50
100
50
50
Compressive strength, MPa
37.8
38.0
46
37.9
*Assume that the water content is above the saturated surface-dry (SSD) condition of the aggregate.
d. Using water reducer, how can we reduce cost without changing work-
ability or strength? (Assume that the cost of the small amount of water
reducer added is less than the cost of cement.) Refer to the appropriate
case in…
The results of a laboratory experiment to evaluate the effects of a plasticizer are shown.a. Calculate the water/cement in each of the three cases. b. Choose an appropriate case that - by using water reducer, how can we increase the compressive strength of concrete without changing workability? (Refer to the appropriate case in the table) c. Choose an appropriate case that - by using a water reducer, how can we improve workability without changingthe compressive strength? (Refer to the appropriate case in the table)d. Choose an appropriate case that - by using water reducer, how can we reduce cost without changing workability or strength? (Refer to the appropriate case in the table)
Answer part d and e
Chapter 6 Solutions
Materials for Civil and Construction Engineers (4th 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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