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

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

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 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 kips shown in Table P6.23.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.
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.
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?
In order to evaluate the suitability of nonpotable water available at the job sitefor mixing concrete, six standard mortar cubes were made using that waterand six others using potable water. The cubes were tested for compressivestrength 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 mixingconcrete according to ASTM C94?b. According to ASTM C94, are there other tests to be performed to evaluatethe suitability of that water? Discuss briefly.
In order to evaluate the suitability of nonpotable water available at the job sitefor mixing concrete, six standard mortar cubes were made using that waterand six others using potable water. The cubes were tested for compressivestrength 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 mixingconcrete according to ASTM C94?b. According to ASTM C94, are there other tests to be performed to evaluatethe suitability of that water? Discuss briefly. Please refer to the attached table.
What is the purpose of adding alcohol in test method C173? . When is it necessary to consolidate concrete by vibration in test method C231? Discuss the process of vibration when placing and consolidating the sample. When rodding a layer of concrete in method C138, is it okay to hit the bottom of the measure? If not, how is it supposed to be done?
Design a concrete mix for the following conditions and constraints using the absolute volume method:Design EnvironmentBuilding frameRequired design strength = 27.6 MPaMinimum dimension = 150 mmMinimum space between rebars = 40 mmMinimum cover over rebars = 40 mmStatistical data indicate a standard deviation of compressive strength of 2.1 MPa is expected (more than 30 samples)Only air entrainer is allowedAvailable MaterialsAir EntrainerManufacturer specification 6.3 ml/1% air / 100 kg cementCoarse aggregate19 mm nominal maximum size, river gravel (rounded)Bulk oven dry specific gravity = 2.55, Absorption = 0.3%Oven dry-rodded density = 1761 kg/m3Moisture content = 2.5%Fine aggregateNatural sandBulk oven-dry specific gravity = 2.659, Absorption = 0.5%Moisture content = 2%Fineness modulus = 2.47
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Three 150 mm * 300 mm concrete cylinders with water to cement ratios of0.4, 0.6, and 0.8, respectively. After curing for 28 days, the specimens weresubjected to increments of compressive loads until failure. The load versusdeformation results were as shown in Table P7.26. Assuming that the gauge length is the whole specimen height, it is required todo the following:a. The compressive stresses and strains for each specimen at each loadincrement.b. Plot stresses versus strains for all specimens on one graph.c. The ultimate strength for each specimen.d. The modulus of elasticity as the secant modulus at 40% of the ultimatestress for each specimen.e. The strain at failure for each specimen.f. The toughness for each specimen.g. Comment on the effect of increasing the water–cement ratio on thefollowing:i. Ultimate strengthii. Modulus of elasticityiii. Ductilityiv. Toughness. Curves may be approximated with a series of straight lines.
Design the concrete mix according to the following conditions:Design EnvironmentBuilding frameRequired design strength = 27.6 MPaMinimum dimension = 150 mmMinimum space between rebar = 40 mmMinimum cover over rebar = 40 mmStatistical data indicate a standard deviation of compressive strength of2.1 MPa is expected (more than 30 samples).Only air entrainer is allowed.Available MaterialsAir entrainer: Manufacture specification 6.3 mL/1% air/100 kg cement.Coarse aggregate: 19 mm nominal maximum size, river gravel (rounded)Bulk oven-dry specific gravity = 2.55, absorption = 3.6,Oven-dry rodded density = 1761 kg/m3Moisture content = 2.5,Fine aggregate: Natural sandBulk oven-dry specific gravity = 2.659, absorption = 0.5,Moisture content = 2,Fineness modulus = 2.47