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 6.36QP
Two batches of concrete cylinders were made with and without a calcium chloride (CaCl2) accelerator admixture. Five cylinders were made of each batch and submerged in water for different times before testing for compressive strength and the results are shown in Table P6.36.
It is required to do the following:
a. Using an Excel sheet, plot the relationship between curing time and compressive strength of the two mixes on the same graph. Label all axes and curves.
b. Comment on the effect of the accelerator on the compressive strength of PCC at early and late ages.
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2. In a ready-mix concrete plant, cylindrical samples are prepared and tested periodically to detect
any mix problem and to ensure that the compressive strength is higher than the lower specification limit.
The minimum target value was set at 5,000 psi. The following compressive strength data were collected.
Sample
No.
1
2
3
4
5
6
7
8
9
10
Compressive
strength (psi)
5595
5139
6359
5192
5188
5241
5964
5875
6155
5115
Sample
No.
11
12
13
14
15
16
17
18
19
20
Compressive
strength (psi)
6695
5449
5278
6697
5195
6021
5320
5657
6595
5235
a. Calculate the mean, standard deviation, and the coefficient of variation of the data
b. Using a spreadsheet program, create a control chart for these data showing the target value and the
lower specification limit. Is the plant production meeting the specification requirement? If not, comment
on possible reasons. Comment on the data scatter.
Two batches of concrete cylinders were made with and without a calciumchloride (CaCl2) accelerator admixture. Five cylinders were made of eachbatch and submerged in water for different times before testing for compres-sive strength and the results are shown in Table P6.36.It is required to do the following:a. Using an Excel sheet, plot the relationship between curing time andcompressive strength of the two mixes on the same graph. Label all axesand curves.b. Comment on the effect of the accelerator on the compressive strength ofPCC at early and late ages.
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
table what will happen in each case for the workability and the ultimate compressive strength as
increase, decrease or approximately the same.
What will happen?
Cement
Water
Admixture
(kg)
(kg)
Ultimate compressive
Workability
strength
400
225
None
449
184
None
Water
400
184
Reducer
Water
400
128
Reducer
400
184
Super
Plasticizer
400
184
Air Entrainer
400
184
Accelerator
DFocus
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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- Two batches of concrete cylinders were made with and without a calciumchloride (CaCl2) accelerator admixture. Six cylinders were made of each batch andsubmerged in water for different times before testing for compressive strengthand the results are shown in Table P6.35.It is required to do the following:a. Using an Excel sheet, plot the relationship between curing time andcompressive strength of the two mixes on the same graph. Label all axesand curves.b. Comment on the effect of the accelerator on the compressive strength ofPCC at early and late ages.arrow_forwardComplete the tablearrow_forwardObjective Questions : Answer the following question briefly. 1. How do you test flexural strength ? 2. How do you conduct the flexural strength of concrete ? Show a sketch. 3. What are the factors affecting flexural tests? 4. What is the importance of flexural strength in concrete? 5. What does the higher flexural modulus mean ? 6. How do you calculate the flexural strength of concrete?. 7. Why is flexure test two point loading.?arrow_forward
- 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)arrow_forwardA sieve analysis test was performed on a sample of coarse aggregate and produced the results in Tablea. Calculate the percent passing through each sieve.b. What is the maximum size?c. What is the nominal maximum size?d. Plot the percent passing versus sieve size on a semilog gradation chart.e. Plot the percent passing versus sieve size on a 0.45 gradation chart.f. Referring to Table (ASTM C33), what is the closest size number anddoes it meet the gradation for that standard size?arrow_forwardQ.1 Two groups of concrete produced with exactly the same mixing properties are given in the Table below. Select the group you expect to have higher compressive strength by explaining the reason in your own words and by calculating if necessary. (Similarities in your description will be checked !!!) 1st Concrete 2nd Concrete choise Explanation A Water/Cement=0.45 Water/Cement =0.60 B Dosage: 300 Dosage: 400 C Cured for 28 days in water at 20°C Cured for 28 days in air at 20°C D| 150 mm cube 100 mm cube specimen specimen E 150/300 mm cylinder specimen F Steam cured for 6 hours at 100°C 200/200 mm cube specimen Water cured for 20 hours at 40°Carrow_forward
- 1.40 In a ready-mix plant, cylindrical samples are prepared and tested periodically to detect any mix problem and to ensure that the compressive strength is higher than the lower specification limit. The minimum target value was set at 5,000 psi. The following compressive strength data were collected. Compressive Strength (psi) Compressive Strength (psi) Sample No. Sample No. 1 5595 11 6695 2 5139 12 5449 6359 13 5278 4 5192 14 6697 5 5188 15 5195 6. 5241 16 6021 7 5964 17 5320 5875 18 5657 6155 19 6595 10 5115 20 5235 a. Calculate the mean, standard deviation, and the coefficient of variation of the data. b. Using a spreadsheet program, create a control chart for these data showing the target value and the lower specification limit. Is the plant production meeting the specification requirement? If not, comment on possible rea- sons. Comment on the data scatter.arrow_forwardA 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.arrow_forwardIf you knew that the cubic compressive strength of a certain type of concrete is 35 MPa, then calculate the resulting load during the examination, the maximum force applied by the test device)? 1- Fission tensile test 2- Fault modulus test 3- Compressive test for cylinderarrow_forward
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