Determine the Allowable number of repetitions for a base quality material with 3.8% cement material. Given that, the desired reliability for the project is 95%, load induced tensile strain at the base of the beam specimen was 62 μe. The material when tested on the laboratory was found to have a flexural strength of 1.65 MPa and design modulus to be 3800 MPa.
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- Using Figure a. Determine the ultimate stress at each water–cement ratio.b. Determine the secant modulus at 40% of the ultimate stress at each water–cement ratio.c. Plot the relationship between the secant moduli and the ultimate stresses.d. Plot the relationship between the moduli and the ultimate stresses on the same graph of part (c), using the relation of the ACI Building Code.e. Compare the two relations in questions c and d and comment on any discrepancies.f. Determine the toughness at each water–cement ratio and comment on the effect of increasing water–cement ratio on the toughness of concrete.Three 6 in. * 12 in. concrete cylinders with water to cement ratios of 0.4, 0.6,and 0.8, 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 .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.A center point loading is used to test concrete for flexure. The sample is 150mm x 150mm and has a clear span of 600mm. The sample failed when the load applied is 100,000N. What is the flexure stress at failure in MPa?
- Three 150 mm * 300 mm concrete cylinders with water to cement ratios of 0.4, 0.6, and 0.8, 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 .Assuming that the gauge length is the whole specimen height, it is required to do the following:a. The compressive stresses and strains for each specimen at each load increment.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 ultimate stress 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 the following:i. Ultimate strengthii. Modulus of elasticityiii. Ductilityiv. Toughness. Curves may be approximated with a series of straight lines.A concrete specimen with b = d is supported at both ends 600mm apart. It is tested for flexure strength with load at midspan of 100kN and failed with a flexural stress of 52.083 MPa. What is the dimension b and d of the specimen in mm?100mm diameter cylindrical concrete specimen was tested for compressive strength. The sample failed when a maximum applied force was 200,000N. What is the stress at failure of the specimen in MPa?
- The third-point loading flexure strength test was performed on a concrete beam having a cross section of 0.15 m by 0.15 m and a span of 0.45 m. If the load at failure was 35.7 kN, calculate the flexure strength of the concrete. This normal-weight concrete has an average compressive strength of 20 MPa. What is the estimated flexure strength (hints: use the ACl equation)?Which of the following is NOT a benefit of using SCMs? Increase required concrete curing time Increase long term strength Reduce permeability Increase the resistance to chloride ionsWhat factors influence the creep of concrete? What are the types and grades of the steel reinforcement used in reinforced concrete? On the stress-strain diagram of a steel bar, show and explain the following: proportional limit, yield stress, ultimate stress, yield strain, and modulus of elasticity
- 2. Data for calculating compressive strength: Ø Tested material – cement paste Ø Force destroying the specimen (first half of the beam), Fc1 – 25900 N Ø Force destroying the specimen (first half of the beam), Fc2 – 26300 N Calculate compressive strengthTo evaluate the effect of a certain admixture on the flexure strength of concrete, two mixes were prepared, one without admixture and one with admixture. Three beams were prepared of each mix. All the beams had a cross section of 0.15 m by 0.15 m and a span of 0.45 m. The third-point loadingflexure strength test was performed on each beam after 7 days of curing. The loads at failure of the beams without admixture were 32.8, 34.5, and 31.7 kN, while the loads at failure of beams with admixture were 39.4, 35.6, and 35.0 kN. Determine:a. The modulus of rupture of each beam in MPa.b. The average moduli of rupture of the beams without and with admixture.c. The percent of increase of the average modulus of rupture due to adding the admixture.Using Figure 7.34, d. Plot the relationship between the moduli and the ultimate stresses on the same graph of part (c), using the relation of the ACI Building Code (Equation 7.3). e. Compare the two relations in questions c and d and comment on any discrepancies f. Determine the toughness at each water-cement ratio and comment on the effect of increasing water-cement ratio on the toughness of concrete.