2. In order to evaluate the suitability of non-potable water available at the job site for mixing concrete, six standard mortar cubes were made using that the water and six others using potable water. The cubes were tested for compressive strength after 7 days of curing and produced the following loads of failure (in pounds), Cubes Made with Cubes Made with Potable Water Nonpotable Water 16,200 14,530 15,820 17,800 16,530 16,820 14,160 16,100 15,870 14,380 17,920 15,690 18,820 16,720

2. In order to evaluate the suitability of non-potable water available at the job site for mixing concrete, six standard mortar cubes were made using that the water and six others using potable water. The cubes were tested for compressive strength after 7 days of curing and produced the following loads of failure (in pounds), Cubes Made with Cubes Made with Potable Water Nonpotable Water 16,200 14,530 15,820 17,800 16,530 16,820 14,160 16,100 15,870 14,380 17,920 15,690 18,820 16,720

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.
The probability of the concrete cubes to pass the compressive strength test for a concrete company is 0.4. If five concrete cubes are selected, what are the following probabilities? No one of them passes the test. Only one pass the test. At least one of them pass the test. 1- 2- 3-
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In a ready mixed concrete plant, 28 days compressive strength results of 16-cylinder specimens were determined as follows. According to ASTM C94 Ready mixed concrete standard and the given data, what should the minimum average compressive strength to be achieved for a concrete class of C30? Specimen # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Compressive Strength (MPa) 36 36 35 32 33 30 30 34 33 30 36 36 29 36 34 34 O a. 33.38 MPa O b. 37.22 MPa Oc 30 MPa O d. 33.84 MPa Oe. 37 MPa
Please short Answer/ Concrete technology.
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What is the effect of water–cement ratio on the permeability of hardened concrete? How does permeability affect the durability of the concrete structure?Using Figure 7.33, what is the approximate percent increase in the coefficientof permeability if the water–cement ratio increases from 0.5 to 0.6? Using thesame figure, what is the approximate percent increase in the coefficient ofpermeability if the water–cement ratio increases from 0.5 to 0.7?
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
The characteristic compressive strength of concrete required is a project is 25 MPa and standard deviation in the observed compressive strength expected at site is 4 MPa. The average compressive strength of cubes tested at different water-cement (w/c) ratios using the same material as is used for the project is given in the table. Water content (%) 45 50 55 60 Average compressive strength of cubes (MPa) 35 25 20 15 20 15 The water-cement ratio (in percent, round off to the lower integer) to be used in the mix is