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 6, Problem 6.34QP
Referring to Table P6.34, Mix No. 1 was designed to produce a 25 mm (2 in.) slump without water reducer. Mixes Nos. 2–4 are trial mixes with water reducer. All mixes have the same amounts of aggregate and cement, different amounts of mixing water.
If the compressive strength at 28 days (fc′) follows the results shown in Figure 6.8, determine the following items:
- a. Water–cement ratio of each mix.
- b. fc′ of each mix
- c. The weight of mixing water required for a mix with water reducer having a 25 mm (2 in.) slump using the same amounts of aggregate and cement shown in the table.
- d. fc′ of the mix in Item c.
- e. Comment on the effect of adding water reducer to the mix and discuss how to make use of it to increase the compressive strength of concrete.
Assume that Figure 6.8 can be extrapolated. Use one system of units only as specified by the instructor.
* Assume all aggregates are in the SSD moisture state.
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A concrete mix includes the following ingredients per cubic meter:
Cement%3D400 kg
Water=184 kg
No admixture
Table below shows possible alternatives mix ingredients. Indicate in the appropriate boxes in the
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increase, decrease or approximately the same.
What will happen?
Cement
Water
Admixture
(kg)
(kg)
Ultimate compressive
Workability
strength
400
225
None
449
184
None
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184
Reducer
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128
Reducer
400
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Plasticizer
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Accelerator
DFocus
A concrete mix includes the following ingredients per cubic meter: a. Cement = 400 kg b. Water = 176 kg c. No admixture Table P6.30 shows possible changes that can be made to the mix ingredi- ents. Indicate in the appropriate boxes in the table what will happen in each case for the workability and the ultimate compressive strength as increase, decrease, or approximately the same.
a) Calculate the temperature of aggregates to produce fresh concrete having the sametemperature with the ambient temperature. Following data in Table 1 could be used:
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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