Materials for Civil and Construction Engineers (4th Edition)
4th Edition
ISBN: 9780134320533
Author: Michael S. Mamlouk, John P. Zaniewski
Publisher: PEARSON
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Chapter 6, Problem 6.40QP
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 psi with and without admixture are shown in Table P6.40.
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 significance of 0.10?
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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 psi with and without admixture are shown in Table P6.40.Using the statistical t-test, is there a significant difference between the meansof the compressive strengths of the two cement mortars at a level of signifi-cance of 0.10?
QI- A concrete cylindrical specimen 155 mm in diameter and 290 mm long is subjected
to compressive loading up to failure. The following data shown in table below are
obtained. Draw the stress- strain curve and determine:
i) the concrete strength.
ii) Initial Tangent Modulus. iii) Modulus of Elasticity. Iv) Secant Modulus at 90% of
strength and
v) State which type of stress strain behavior is this.
Load, kN
Deformation, mm×10*
(Load - 8x16)
(Deformation x 0.5x16)
222.5
103
413.1
206
635.2
324
730.4
378
856.1
432
953.6
486
1080.7
540
1171.2
756
1270.0
1025
1396.3
1395
When describing the behavior of concrete under load, the popular belief is that concrete will crush when the unit strain reaches 0.003. if a 12-in tall concrete test cylinder is tested to the failure point in a testing machine what will be its height when it fails?
Chapter 6 Solutions
Materials for Civil and Construction Engineers (4th Edition)
Ch. 6 - What ingredients are used for the production of...Ch. 6 - What is the role of gypsum in the production of...Ch. 6 - What is a typical value for the fineness of...Ch. 6 - What are the primary chemical reactions during the...Ch. 6 - Define the C-S-H phase of cement paste.Ch. 6 - What are the four main chemical compounds in...Ch. 6 - Prob. 6.7QPCh. 6 - Define a. interlayer hydration space b. capillary...Ch. 6 - Prob. 6.9QPCh. 6 - The following laboratory tests are performed: a....
Ch. 6 - What is a false set of portland cement? State one...Ch. 6 - The watercement ratio is important because it...Ch. 6 - Discuss the effect of watercement ratio on the...Ch. 6 - Draw a graph to show the general relationship...Ch. 6 - Students in the materials class prepared three...Ch. 6 - Students in the materials class prepared three...Ch. 6 - Two batches of cement mortar with properties as...Ch. 6 - What are the five primary types and functions of...Ch. 6 - Why isnt pozzolan used with Type III cement?Ch. 6 - What type of cement would you use in each of the...Ch. 6 - In order to evaluate the suitability of nonpotable...Ch. 6 - Three standard mortar cubes were made using...Ch. 6 - Four standard mortar cubes were made using...Ch. 6 - Discuss the problem of disposal of waste water...Ch. 6 - State five types of admixtures and discuss their...Ch. 6 - Prob. 6.27QPCh. 6 - Under what condition is an air-entraining agent...Ch. 6 - If a water reducer is added to the concrete mix...Ch. 6 - Prob. 6.30QPCh. 6 - A concrete mix includes the following ingredients...Ch. 6 - The results of an experiment to evaluate the...Ch. 6 - The results of a laboratory experiment to evaluate...Ch. 6 - Referring to Table P6.34, Mix No. 1 was designed...Ch. 6 - Two batches of concrete cylinders were made with...Ch. 6 - Two batches of concrete cylinders were made with...Ch. 6 - What is the source of fly ash? Why is fly ash...Ch. 6 - A materials engineer is working in a research...Ch. 6 - A materials engineer is working in a research...
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- Complete the tablearrow_forwardA 150mm x 300mm long cylindrical concrete specimen was tested for tensile strength. The sample failed when the applied force is 150,000N. What is the splitting tensile strength in MPa?arrow_forwardA 300mm long cylindrical concrete specimen was tested for tensile strength. When the applied load is 205,000N, the sample failed with a tensile strength of 2.90 MPa. What is the diameter of the specimen in mm? Round off your answer to the nearest whole number.arrow_forward
- When a specimen of M25 concrete is loaded to a stress level of 12.5 MPa, a strain of 500x10^-6 is recorded. If this load is allowed to stand for a long time, the strain increases to 1000 x 10^-6. In accordance with provisions of IS: 456-2000,considering the long-term effects, the effective modulus of elasticity of the concrete (in MPa) isarrow_forwardHelp me with thisarrow_forward150mm cylindrical concrete specimen was tested for tensile strength. When the applied load is 180,000N, the sample failed with a tensile strength of 2.55MPa. What is the length of the specimen in mm? Round off your answer to the nearest whole number.arrow_forward
- Two 150 mm * 300 mm concrete cylinders with randomly oriented steelfiber contents of 0 and 2% by weight, respectively. After curing for 28 days,the specimens were subjected to increments of compressive loads until failure. The load versus deformation results were as shown in Table P7.45. Assuming that the gauge length is the whole specimen height, determine the following:a. The compressive stresses and strains for each specimen at each loadincrement.b. Plot stresses versus strains for the two specimens on one graph.c. The initial modulus of elasticity for each specimen.d. The ultimate strength for each specimen.e. The strain at failure for each specimen.f. Toughness. Curves may be approximated with a series of straight lines.g. Comment on the effect of adding fiber on the following:i. Modulus of elasticityii. Ultimate strengthiii. Ductilityiv. Toughnessarrow_forward2. 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.arrow_forwardThere are 3 factors that may be the cause of the production error in the reinforced concrete element shown in the figure.arrow_forward
- A concrete test cylinder is tested in compression after 7 days of moist curing. If the strength is 22.5 MPa, what do you predict for the projected 28-day strength knowing that the sample only gain 80% strength at 7 days?arrow_forwardDetermine Given the following tabulated data representing a sample from a concrete mix used in a project. The arithmetic mean (x) is approximately. Compressive Strength (MPa) Frequency 15 18 21 24 27 30 3 4 4 3 21 MPa 22 MPa 23 MPa 25 MPa Oarrow_forwardIn 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 compressive strength data shown in Table were collected. 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 lower specification limit. Is the plant production meeting the specification requirement? If not, comment on possible reasons. Comment on the data scatter.arrow_forward
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