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 6.22QP
In order to evaluate the suitability of nonpotable water available at the job site for mixing concrete, six standard mortar cubes were made using that water and six others using potable water. The cubes were tested for compressive strength after 7 days of curing and produced the loads to failure (in pounds) shown in Table P6.22.
a. Based on these results only, would you accept that water for mixing concrete according to ASTM C94?
b. According to ASTM C94, are there other tests to be performed to evaluate the suitability of that water? Discuss briefly.
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Students have asked these similar questions
In order to evaluate the sustainability of non-potable water available in the job site for mixing
concrete, six standard mortar cubes were made using that water and six others using potable
water. The cubes were tested for compressive strength after 7 days of curing and produced the
loads to failure (in kN) shown in table below.
Based on these results, would you accept that water for mixing concrete?
Cubes made with
Cubes made with
non-potable water
potable water
64.6
73.5
70.4
74.8
63.0
79.7
71.6
69.8
70.6
83.7
64.0
74.4
Three standard mortar cubes were made using non-potable water available at the job site,
and three others were made using potable water. The cubes were tested for compressive
strength after seven days of curing and produced the following failure loads in kilograms:
Based on these results only, would you accept that water for mixing concrete according to
ASTM standards? Why?
Nonpotable Water
Potable Water
6909
7773
6591
7400
7227
7364
Students in the materials class prepared three mortar mixes with water tocement ratios of 0.50, 0.55, and 0.60. Three 50-mm mortar cubes were pre-pared for each mix. The cubes were cured for 7 days and then tested for com-pressive strength. The test results were as shown in Table P6.16.Determine the following:a. The compressive strength of each cube.b. The average compressive strength for each mix.c. Plot the average compressive strength versus w/c ratios for all mixes.d. Comment on the effect of increasing w/c ratio on the compressive strengthof the cubes.
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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- In order to evaluate the suitability of nonpotable water available at the job site for mixing concrete, six standard mortar cubes were made using that water and six others using potable water. The cubes were tested for compressive strength after 7 days of curing and produced the loads to failure (in kN) shown in Table P6.21. a. Based on these results only, would you accept that water for mixing concrete according to ASTM C94? b. According to ASTM C94, are there other tests to be performed to evaluate the suitability of that water? Discuss briefly. TABLE P6.21 Cubes Made with Cubes Made with Potable Water Nonpotable Water 64.6 73.5 70.4 74.8 63.0 79.7 71.6 69.8 70.6 83.7 64.0 74.4arrow_forwardThe 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_forwardMixing and handling can significantly alter the air content of fresh concrete. Thus, field tests are used to ensure that the concrete has the proper air content prior to placing. Air content can be measured with the pressure, volumetric, gravimetric, or Chace air indicator methods. The pressure method (ASTM C231) is widely used, since it takes less time that the volumetric method. The pressure method is based on Boyle's law, which relates Figure 7.13 Consolidating concrete with an internal vibrator. pressure to volume. A calibrated cylinder (Figure 7.14) is filled with fresh concrete. The vessel is capped and air pressure is applied. The applied pressure compresses the air in the voids of the concrete. The volume of air voids is determined by measuring the amount of volume reduced by the pressure applied. This method is not valid for concrete made with lightweight aggregates, since air in the aggregate voids is also compressed, confounding the measurement of the air content of the…arrow_forward
- Three 100*200 mm cylindrical concrete specimens were tested for 28 days compressive strength and show 30.5 MPa, 29.6 MPa and 32.8 MPa compressive strength. a) What is the average compressive strength of this concrete? b) What is the approximate tensile strength of this concrete? c) What is the approximate modulus of elasticity of this concrete? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIU Paragraph Arial 10pt A v x² X, +, 田用国 田用因 Ť } !!arrow_forwardin a ready mixed concrete plant, 28-day compressive strength results of 32-cylinder specimens prepared by using the same concrete mix design were determined as follows. Considering the overdesign required according to ASTM C94 standard, which compressive strength class can this concrete can be belonging to? Show your work. Specimen # 1 2 3 4 5 6 7 8 Compressive Strength (MPa) 25 20 23 22 20 23 23 24 Specimen # 9 10 11 12 13 14 15 16 Compressive Strength (MPa) 25 21 15 20 20 19 25 26 Specimen # 17 18 19 20 21 22 23 24 Compressive Strength (MPa) 21 15 16 22 21 27 23 24 Specimen # 25 26 27 28 29 30 31 32 Compressive Strength (MPa) 23 23 24 27 20 29 24 25arrow_forwardStudents in the materials class prepared three mortar mixes with water tocement ratios of 0.50, 0.55, and 0.60. Three 2-in. mortar cubes were preparedfor each mix. The cubes were cured for 7 days and then tested for compressivestrength. The test results were as shown in Table P6.17.Determine the following:a. The compressive strength of each cube.b. The average compressive strength for each mix.c. Plot the average compressive strength versus w/c ratios for all mixes.d. Comment on the effect of increasing w/c ratio on the compressive strengthof the cubes.arrow_forward
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