Cylinders which have been subjected only to field curing conditions prior to testingmay be used to assess the quality of the concrete as delivered.OA) TrueO B) FalseThe specified compressive strength of a concrete mixture is 30 MPa. If C-2 is chosenas the suitable exposure class and no statistical data on previous mixtures areavailable, which one of the following would best estimate the required compressivestrength (in MPa) based on the CSA Standard?O A) 40.5O B) 36.5O) 38.5O D) 32Which one of the following methods may be used to increase the workability of freshconcrete?OA All of the aboveB) Adding super plasticizersC) Using well-graded aggregatesO D) Using rounded aggregatesDetermine the exposure class that would be used for concrete in a very severeenvironment like that of the Confederation Bridge in Prince Edward Island (PEI) withhigh durability performance expectations.O Al S-1O B) C-1OD) F-1O

Cylinders which have been subjected only to field curing conditions prior to testing may be used to assess the quality of the concrete as delivered. OA) True B) False The specified compressive strength of a concrete mixture is 30 MPa. If C-2 is chosen

Cylinders which have been subjected only to field curing conditions prior to testing may be used to assess the quality of the concrete as delivered. OA) True B) False The specified compressive strength of a concrete mixture is 30 MPa. If C-2 is chosen

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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Working on major construction project that requires considerable amounts of concrete to be used,you are asked to design a concrete mix following the BRE methodology. The concrete mixspecifications are:o Characteristic compressive strength of 50 N/mm 2 at 7 days.o Failure rate of 2%o Previous control data yielded a standard deviation of 5 N/mm 2o CEM-I 52.5o Air-entraining is not requiredo Required slump 120 mmo Coarse aggregate: Crushed maximum size 10mmo Fine aggregate: Uncrushed with 45% passing 600 μm sieveo Relative density of aggregates: 2.7o Coarse aggregate has 4% moistureo Fine aggregate is dry and has 1.2% absorption.o Volume of the required trial mix: 0.120 m3 Create the mix design and state what actions and recommenations you would do if trial produced a result with a mean compressive strength of 64 MPa at 7 days and the slump was 80mm.
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)38.3, 42.5, 39.6, 41.8, 42.5, 39.3, 41.2, 40.9, 39.8, 41.642.9, 43.4, 39.9, 44.7, 45.1, 43.9, 42.4, 41.7, 41.1, 42.1Calculate the Arithmetic Mean, Median, and Standard Deviation.
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.
Show complete process. 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) 38.3, 42.5, 39.6, 41.8, 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 Devi ation. For standard deviation, create a table showing the process like (x) (x-mean) (x-mean) ²
Show complete process. 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) 38.3, 42.5, 39.6, 41.8, 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 Devi ation.
1) A project specifies a concrete strength of at least 3000 psi. Materials engineers will design the mix for a strength higher than that. Calculate the required average compressive strength of the mix design if the standard deviation is s = 350 psi. Estimate the modulus of elasticity of the concrete at the required average compressive strength (the calculated strength, not the given strength).
Working on major construction project that requires considerable amounts of concrete to be used,you are asked to design a concrete mix following the BRE methodology. All the necessary tables forthis can be found in the Appendix. The concrete mix specifications are:o Characteristic compressive strength of 35 N/mm 2 at 28 days.o Failure rate of 2%o Previous control data yielded a standard deviation of 10 N/mm 2o CEM-I 42.5o Air-entraining is not requiredo Maximum water to cement ratio 0.40o Minimum cement content 390 kg/m 3o Required slump 50 mmo Coarse aggregate: Crushed maximum size 20mmo Fine aggregate: Uncrushed with 90% passing 600 μm sieveo Relative density of aggregates: 2.5o Coarse aggregate has 4% moistureo Fine aggregate is dry and has 1.2% absorption.o Volume of the required trial mix: 0.090 m 3Following the BRE step-by-step process estimate the water content of the mix estimate the content of aggregates, provide the estimated mix quantities
choose the correct answer Q1A- Which test gives more variable one of the modulus of rupture * 1-Center-point loading test 2-Two-point loading 3-Splitting tension test 4-Direct tension test B- Which process comes after batching in the manufacturing process of concrete? * 1-Transportation 2-Placing 3-Mixing 4-Compacting C- Excess vibration during compacting can lead to: * 1-Bleeding 2-Segregation 3-High strength 4-Air bubbles
Working on major construction project that requires considerable amounts of concrete to be used,you are asked to design a concrete mix following the BRE methodology. The concrete mixspecifications are:o Characteristic compressive strength of 50 N/mm 2 at 7 days.o Failure rate of 1%o Previous control data yielded a standard deviation of 5 N/mm 2o CEM-I 52.5o Air-entraining is not requiredo Required slump 50 mmo Maximum cement content is 550 kg/m 3o Coarse aggregate: Uncrushed maximum size 10mmo Fine aggregate: Uncrushed with 45% passing 600 μm sieveo Relative density of aggregates: 2.7o Assume both types of aggregate as SSD. Proceed with the concrete mix design methodology and comment on any implications during thisprocess.
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.
The design engineer specifies a concrete strength of 3700 psi. A plant where s = 300 psi for 41 test results. Which is the required average compressive strength to be used in your mix design? a. 3900 psi; b) 4000 psi; c)4 100 psi; d) 4200 psi