Three standard mortar cubes were made using nonpotable water available atthe job site, and three others were made using potable water. The cubes weretested for compressive strength after 7 days of curing and produced the failureloads in kN shown in Table P6.22.The Vicat test was conducted on the cement paste made with the questionablewater and showed that the set time was 45 minutes more than the set time ofpaste made with potable water. Based on these results, would you accept thatwater for mixing concrete according to ASTM standards? Explain why.TABLE P6.22Nonpotable WaterPotable Water70.375.273.083.273.877.4

Given:- 3 standard mortar cubes set time=45min To find:- accept water for mixing

Answered: Three standard mortar cubes were made…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Four 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.
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 kN shown in Table P6.22. 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.
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.
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 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@) .
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.
A 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?
Following 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. 312m
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.
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.
If 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 cylinder
@ (i) Concrete is used in a variety of applications from high-rise constructions to road pavements, bridges and floor slabs. Engineers will specify the strength of concrete mixes needed for each specific application. Compressive stress testing is carried out on test samples from concrete batches for purposes of quality control. In the space provided, sketch and label the fracture pattern of the concrete test piece after a compressive test. musgaib edt nodig Stansi VOR beforomo of bebe si giordinien fest2 quintetoeditedal budala wold Talno banoqquz odlo dianorte sliznat big or hobson axed loota 4300 GAOI (0)
A 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 MPa with and without admixture are shown in Table P6.38. Using the statistical t-test, is there a significant difference between the means of the compressive strengths of the two cement mortars at a level of signifi- cance of 0.10? TABLE P6.38 Compressive Strength, MPa Cube No. With Admixture Without Admixture 1 24.2 24.4 2 25.1 26.0 3 25.6 25.6 4 24.1 25.1 23.5 24.5 25.4 25.1 7 24.4 23.4 24.2 24.5 8.

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