Three standard mortar cubes were made using nonpotable water available at the job site, and three others were made using potable water. The cubes were tested for compressive strength after 7 days of curing and produced the failure loads in kips shown in Table P6.23.
The Vicat test was conducted on the cement paste made with the questionable water and showed that the set time was 45 minutes more than the set time of paste made with potable water. Based on these results, would you accept that water for mixing concrete according to ASTM standards? Explain why.
TABLE P6.23
Nonpotable Water | Potable Water |
15.8 | 16.9 |
16.4 | 18.7 |
16.6 | 17.4 |
Want to see the full answer?
Check out a sample textbook solutionChapter 6 Solutions
Materials for Civil and Construction Engineers (4th Edition)
Additional Engineering Textbook Solutions
Elementary Surveying (14th Edition)
Structural Steel Design (6th Edition)
Structural Analysis (10th Edition)
Elementary Surveying: An Introduction To Geomatics (15th Edition)
Foundation Design: Principles and Practices (3rd Edition)
Vector Mechanics for Engineers: Statics and Dynamics
- 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.arrow_forwardFour standard mortar cubes were made using nonpotable water available atthe job site, and four others were made using potable water. The cubes weretested for compressive strength after 7 days of curing and produced the failureloads in kilograms shown in Table P6.24.Also, the Vicat test was conducted on the cement paste made with the ques-tionable water and showed that the set time is 0.5hour less than the set timeof paste made with potable water. Based on these results, would you acceptthat water for mixing concrete according to ASTM standards? Explain why.arrow_forwardIn 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 at 42.0 MPa. The following compressive strength data were collected: All in Mega-Pascal (MPa) 38.3, 39.3, 41.2, 40.9, 39.8, 42.9, 43.9, 42.4, 41.7, 41.1, 42.1 42.5, 39.6, 41.8, 42.5, 41.6 43.4, 39.9, 44.7, 45.1, Calculate the Arithmetic Mean, Median, and Standard Deviation.arrow_forward
- Students in the materials class prepared three mortar míxes with water to cement 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. ТАBLE P6.16 Mix w/c Мaximum Compressive Average Compressive Strength (MPa) No. Ratio Cube No. Load (kN) Strength (MPa) 1 79.4 1 0.50 80.1 81.9 1. 74.7 2 0.55 2 74.5 3 72.5 1. 65.8 2 69.3 3 0.60 71.2 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 strength of the cubes.arrow_forwardThree standard mortar cubes were made using questionable water available at the job site, and three others were made using potable water. The cubes were tested for compressive strength after 7 days of curing and produced the failure loads in kN shown in the following table: Questionable Water Potable Water 56.19 63.17 53.13 65.01 52.56 60.06 The Vicat test was conducted on the cement paste made with the questionable water and showed that the set time is 1 hour more than the set time of paste made with potable water. Based on these results, would you accept that water for mixing concrete according to ASTM standards? Explain why.arrow_forwardIn 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 at 42.0 MPa. The following compressive strength data were collected: All in Mega-Pascal (MPa) 41.8, 38.3, 42.5, 39.6, 42.5, 39.3, 41.2, 40.9, 39.8, 41.6 42.9, 43.4, 39.9, 44.7, 45.1, 43.9, 42.4, 41.7, 41.1, 42.1 Calculate the Arithmetic Mean, Median, and Standard Deviation. (Non-anonymous question@) .arrow_forward
- Three mortar mixes were prepared with water to cement ratios of 0.50, 0.55, and 0.60. Three 2-in. mortar cubes were prepared for each mix. The cubes were cured for 7 days and then tested for compressive strength. The test results were as shown in Table.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 strength of the cubes.arrow_forwardA materials engineer is working in a research project to evaluate the effect of one type of admixture on the compressive strength of concrete. He tested eight mortar cubes made with admixture and eight others without admixture after 28 days of curing. The compressive strengths of cubes in psi with and without admixture are shown in Table P6.40.Using the statistical t-test, is there a significant difference between the meansof the compressive strengths of the two cement mortars at a level of signifi-cance of 0.10?arrow_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
- Students prepared three mortar mixes in materials lab with water to cement ratios of 0.50, 0.55 and 0.60. Three 50mm mortar cubes were prepared for each mix. The cubes were tested for 7 days compressive strength. The test results are shown in table below: Average Compressive Strength (MPa) Maximum Load Compressive Strength (MPa) Mix No. W/C Ratio Cube No. (kN) 1 0.50 1 75.4 76.1 3. 77.8 0.55 1 70.9 70.7 3 68.8 0.60 62.5 65.8 3 67.6 3.arrow_forward2. 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.arrow_forwardFollowing is the given data of compressive strength test done on 2 inch cement mortar cubes: w/c Cube Maximum Load (lb) 17640 18270 17890 16350 16740 15990 14870 15260 15790 Ratio No. 0.50 0.55 2 0.60 Determine: a) Compressive strength of each cube. b) Average compressive strength for each mix. 312marrow_forward
- Structural Analysis (10th Edition)Civil EngineeringISBN:9780134610672Author:Russell C. HibbelerPublisher:PEARSONPrinciples of Foundation Engineering (MindTap Cou...Civil EngineeringISBN:9781337705028Author:Braja M. Das, Nagaratnam SivakuganPublisher:Cengage Learning
- Fundamentals of Structural AnalysisCivil EngineeringISBN:9780073398006Author:Kenneth M. Leet Emeritus, Chia-Ming Uang, Joel LanningPublisher:McGraw-Hill EducationTraffic and Highway EngineeringCivil EngineeringISBN:9781305156241Author:Garber, Nicholas J.Publisher:Cengage Learning