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.TABLE P7.26Specimen No.13w/c Ratio0.40.60.8Deformation (mm)Load (kN)0.35143482440.6853 (failure)4723040.9433 (failure)2631.2235 (failure)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.

Stress is defined as the load acting per unit area. Strain is a ratio of change in length to the…

Answered: Three 150 mm × 300 mm concrete…

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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The stem-leaf diagram below shows compressive strength of concrete cubes measured in (Kpa). Determine the median
A 150mm diameter cylindrical concrete specimen was tested for compressive strength. Thestress at failure is 27.6 MPa, what is the maximum applied force in kN?
Three batches of concrete were prepared using the same materials and ingre- dients, except that they have water-cement ratios of 0.50, 0.55, and 0.60, respectively. The following tests were performed on specimens made of the three batches: - Compressive strength test on 100 mm × 200 mm cylinders - Center point floxure test on 100 mm × 100 mm × 300 mm bcams - Split tension test on 150 mm X 300 mm cylinders Three replicates were tested for each test. Table P7.38 shows the average fail- ure loads for the three replicates of each case. It is required to do the following: a. Complete Table P7.38 b. Using an Excel sheet, plot the relationships between water-cement ratio and compressive strength, modulus of rupture, and tensile strength on the same graph. Label all axes and curves. c. Comment on the effect of water-cement ratio on the compressive strength, modulus of rupture, and tensile strength. TABLE P7.38 w/c Ratio Compressive Strength Test Flexure Test Split Tension Test Compres- sive…
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.
Three batches of concrete were prepared using the same materials and ingre-dients, except that they have water–cement ratios of 0.50, 0.55, and 0.60,respectively. The following tests were performed on specimens made of thethree batches:■ Compressive strength test on 4′′ * 8′′ cylinders■ Center-point flexure test on 4′′ * 4′′ * 12′′ beams■ Split tension test on 6′′ * 12′′ cylindersThree replicates were tested for each test. Table shows the average failure loads for the three replicates of each case.It is required to do the following:a. Complete Tableb. Using an Excel sheet, plot the relationships between water–cement ratio and compressive strength, modulus of rupture, and tensile strength on the same graph. Label all axes and curves.c. Comment on the effect of water–cement ratio on the compressive strength, modulus of rupture, and tensile strength.
Use metric please
2. What is the standard size of PCC specimens to be tested for compressive strength? If a smaller size is used, which size is expected to provide higher compressive strengths? Why? Which size provides strengths close to that of an actual concrete structure? 3. What is the purpose of performing the flexure test on concrete? How are the results of this test related to the compressive strength test results? 4. What are the advantages of using a third-point loading flexure test over a center-point loading flexure test? Draw a shear force diagram and a bending moment diagram for each case to support your answer.
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@) .
A concrete test cylinder with a cross-sectional area of 28.3 in squared is to be tested in axial compression. Before loading two marks are scribed on the cylinder precisely 8 in apart (as shown in the figure below) when the load is 40,000 lb the marks are measured and found to be 7.997 in apart determine the E value for this concrete. Assume an approximately linear relationship between stress and strain.
Q2- A cylindrical concrete specimens 150 mm in diam. and 300mm high each were tested in split tensile test, the following results were observed, determine the tensile strength of concrete and estimate the compressive strength. S.N 1 3 4 7 Load, kN 267.3 269.4 260.5 255.4 287.2 291.4 282.5 (Load+5x18
Please provide complete solution.
Obtain the following, for all problems below: a) The judgment as regards the extent of produced concrete being in accordance with the requirements of the project. b) The impact of the means of sample preparation and testing on the variation of the obtained results. c) The level of “Quality Control" for the produced concrete. d) Prediction of the extent of compliance of the produced concrete – in future – with the project requirements. In case the requirements are not satisfied, what are the steps that should be followed?

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