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2) Three samples of concrete, the first one is cured for three days, the second one...
Strength of concrete: The compressive strength in kilopascals, was measured for concrete blocks from five different...
Strength of concrete: The compressive strength in kilopascals, was measured for concrete blocks from five different batches of concrete, both three and six days after pouring. The data are as follows: Batch 2 1372 1313 1 1379 1337 After 6 days After 3 days 3 1365 1352 4 1382 1358 5 1358 1322 Send data to Excel Part: 0/2 Part 1 of 2 (a) Construct a 99.8% confidence interval for the difference between the mean strengths of blocks cured three...
Given: Measured compressive strength of concrete as a function of curing time Curing time (days) Compressive...
Given: Measured compressive strength of concrete as a function of curing time Curing time (days) Compressive strength of concrete (MPa) 17 23 26 28 29 30 14 21 28 (a) Using Excel, prepare a scatter chart with curing time on the horizontal axis and compressive strength on the vertical axis. Show only black markers with no lines and format your chart in the usual way (Times new roman 16 bold axis numbers and Times new roman 18 bold axis titles)....
please help with this concrete design mix problem (40 points) Design the concrete mix according to...
please help with this concrete design mix problem
(40 points) Design the concrete mix according to the following conditions. Perform the necessary computations to determine all ingredients in (kg) per unit volume of mix, and state resources and cite references used for each step. Summarize your design in the table at the bottom, and answer the questions beneath the table. Application Environment Area 52, airport location Idaho, (150m x 50m) runway test section Exposures: freeze-thaw, deicers Design Environment Concrete Requirements:...
Brake wear: For a sample of 9 automobiles, the mileage (in 1000s of miles) at which...
Brake wear: For a sample of 9 automobiles, the mileage (in 1000s of miles) at which the original front brake pads were worn to 10% of their original thickness was measured, as was the mileage at which the original rear brake pads were worn to 10% of their original thickness. The results were as follows: Car Rear 41. 2 36.3 45.8 46.6 39.6 52.3 51.7 46.3 47.4 Front 32.2 27.2 34.7 37.3 30.7 40.5 41.0 33.8 36.8 7 8 Send...
Two beams are shown below. The first is singly reinforced with 3-#8, the second is doubly...
Two beams are shown below. The first is singly reinforced with
3-#8, the second is doubly reinforced by adding 2-#7 both top and
bottom. The concrete compressive strength, f’c = 3000 psi and the
steel is grade 60.
For the doubly reinforced beam, what is the location of the
neutral axis, c, measured from the top of the beam?
3.9 in.
5.6 in.
5.0 in.
4.4 in.
14 2 -2-t17 1G 2 2-17
The data in the accompanying table represent the compressive strength, in thousands of pounds per square...
The data in the accompanying table represent the compressive strength, in thousands of pounds per square inch (psi), of 20 samples of concrete taken two and seven days after pouring. Complete parts (a) through (c) below. At the .01 level of significance, is there evidence that the mean strength is lower at two days than at seven days? Sample Two days Seven days 1 3.115 3.675 2 3.17 3.66 3 3.765 4.57 4 2.845 4.53 5 3.035 3.595 6 3.205...
Consider a study to determine the compressive strength of concrete blocks used for paving Two methods...
Consider a study to determine the compressive strength of concrete blocks used for paving Two methods of manufacturing concrete blocks are under investigation- method 1 (which is more expensive) and method 2. Research indicates that the greater the compressive strength of concrete, the greater the durability of a concrete block. Therefore the question is which one, if either, of the two methods produces greater compressive strength. In addition, the manufacturer considers that an average difference between the methods of less...
Three lottery tickets for first, second, and third prizes are drawn from a group of 40...
Three lottery tickets for first, second, and third prizes are drawn from a group of 40 tickets. Find the number of sample points in S for awarding 3 prizes if each contestant hold only 1 ticket.
9)A candidate is selected for interview for three posts. For the first post there are 3 candidates, for the second there are 4 and for the third there are 2. What are the chances ofhis getting at least one post?
9)A candidate is selected for interview for three posts. For thefirst post there are 3 candidates, for the second there are 4 and for thethird there are 2. What are the chances ofhis getting at least one post?
14. The measured free compressive strength averages of the cylindrical ground samples are reported to be...
14. The measured free compressive strength averages of the cylindrical ground samples are reported to be 40 MPa and the variances of 9 MPaʼ with lognormal distribution. The free compressive strength of a sample chosen randomly from these ground samples; a) Find the probability of being at most 35 MPa. b) Find the probability of being between 45 MPa and 50 MPa. c) Estimate the highest strength value of the 8% group with the lowest free pressure resistance 15. A...
Strength of concrete: The compressive strength in kilopascals, was measured for concrete blocks from five different batches of concrete, both three and six days after pouring. The data are as follows: Batch 2 1372 1313 1 1379 1337 After 6 days After 3 days 3 1365 1352 4 1382 1358 5 1358 1322 Send data to Excel Part: 0/2 Part 1 of 2 (a) Construct a 99.8% confidence interval for the difference between the mean strengths of blocks cured three...
Given: Measured compressive strength of concrete as a function of curing time Curing time (days) Compressive strength of concrete (MPa) 17 23 26 28 29 30 14 21 28 (a) Using Excel, prepare a scatter chart with curing time on the horizontal axis and compressive strength on the vertical axis. Show only black markers with no lines and format your chart in the usual way (Times new roman 16 bold axis numbers and Times new roman 18 bold axis titles)....
please help with this concrete design mix problem
(40 points) Design the concrete mix according to the following conditions. Perform the necessary computations to determine all ingredients in (kg) per unit volume of mix, and state resources and cite references used for each step. Summarize your design in the table at the bottom, and answer the questions beneath the table. Application Environment Area 52, airport location Idaho, (150m x 50m) runway test section Exposures: freeze-thaw, deicers Design Environment Concrete Requirements:...
Brake wear: For a sample of 9 automobiles, the mileage (in 1000s of miles) at which the original front brake pads were worn to 10% of their original thickness was measured, as was the mileage at which the original rear brake pads were worn to 10% of their original thickness. The results were as follows: Car Rear 41. 2 36.3 45.8 46.6 39.6 52.3 51.7 46.3 47.4 Front 32.2 27.2 34.7 37.3 30.7 40.5 41.0 33.8 36.8 7 8 Send...
Two beams are shown below. The first is singly reinforced with
3-#8, the second is doubly reinforced by adding 2-#7 both top and
bottom. The concrete compressive strength, f’c = 3000 psi and the
steel is grade 60.
For the doubly reinforced beam, what is the location of the
neutral axis, c, measured from the top of the beam?
3.9 in.
5.6 in.
5.0 in.
4.4 in.
14 2 -2-t17 1G 2 2-17
Consider a study to determine the compressive strength of concrete blocks used for paving Two methods of manufacturing concrete blocks are under investigation- method 1 (which is more expensive) and method 2. Research indicates that the greater the compressive strength of concrete, the greater the durability of a concrete block. Therefore the question is which one, if either, of the two methods produces greater compressive strength. In addition, the manufacturer considers that an average difference between the methods of less...
14. The measured free compressive strength averages of the cylindrical ground samples are reported to be 40 MPa and the variances of 9 MPaʼ with lognormal distribution. The free compressive strength of a sample chosen randomly from these ground samples; a) Find the probability of being at most 35 MPa. b) Find the probability of being between 45 MPa and 50 MPa. c) Estimate the highest strength value of the 8% group with the lowest free pressure resistance 15. A...
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