Three 2" x 2" x 2" mortar cubes were made using potable water andanother three of the same dimensions of mortar cubes using non-potable water found at the job site. All mortar cubes were subjectedto compressive strength test after 7 days of curing. The tate belowshows the result of the test.Failure Load inFailure Load inkN using Non-kN usingPotable WaterPotable Water56.5063.2757.2065.1059.2660.16Based on these results, is it acceptable to use the non-potable waterfound at the jobsite for mixing concrete according to ASTMstandard? Discuss your answer briefly.

Given: Three mortar cubes were made using potable water. Three mortar cubes were made using non…

Three 2" x 2" x 2" mortar cubes were made using potable water and another three of the same dimensions of mortar cubes using non- potable water found at the job site. All mortar cubes were subjected to compressive strength test after 7 days of curing. The tate below shows the result of the test.

Three 2" x 2" x 2" mortar cubes were made using potable water and another three of the same dimensions of mortar cubes using non- potable water found at the job site. All mortar cubes were subjected to compressive strength test after 7 days of curing. The tate below shows the result of the test.

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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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. TABLE P6.22 Nonpotable Water Potable Water 70.3 75.2 73.0 83.2 73.8 77.4
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Question 3
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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?
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
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To evaluate the effect of a certain admixture on the flexure strength of concrete, two mixes were prepared, one without admixture and one with admixture.Three beams were prepared of each mix. All the beams had a cross section of 4 in. * 4 in. and a span of 12 in. The third-point loading flexure strength test was performed on each beam after 7 days of curing. The loads at failure of the beams without admixture were 6044, 5071, and 5934 lb, while the loads at failure of beams with admixture were 7299, 7305, and 6983. Determine:a. The modulus of rupture of each beam in psi.b. The average moduli of rupture of the beams without and with admixture.c. The percent of increase of the average modulus of rupture due to adding the admixture.
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 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?
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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.