# reinforced cement concrete homework help

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• Q1: 10. Explain the first area of moment at h/2 and the second area of moment at h for a concrete beam, which is b wide and h deep.See Answer
• Q2:9. What role does ettringite play in cement technology?See Answer
• Q3: 5) (100 points) What are the recommendations for the concrete memo based on the objective and results (i.e., should the mix design be accepted or are changes to the mix design necessary?)See Answer
• Q4: 2. (40 pts) The No 7 bottom bars are epoxy coated. If normal weight concrete having astrength of 3,500 psi is used with 60 ksi steel, determine the required development length. Use simplified equations from ACI Table 25.4.2.3 (attached) (20 pts) b. Use equation from ACI 25.4.2.4 (20 pts) See Answer
• Q5: 8. What cements would be appropriate for concrete pavement repair under winter conditions?See Answer
• Q6: 4. Calculate the compound composition for a Portland cement having the following oxideanalysis: a. C= 64.15%, S = 21.87%, A = 5.35%, F = 3.62%, S= 2.53% b. C= 63.54%, S = 23.09%, A = 3.61%, F = 6.38%, § = 2.29%See Answer
• Q7: 5. Calculate the heat of hydration after three days for a Portland cement with the following compound composition: a. C3S = 55%, C2S = 24%, C3A = 10%, C4AF = 9% b. C3S = 27%, C2S = 51%, C3A = 7%, C4AF = 13%See Answer
• Q8: 2. In 2019, Portland cement consumption in the US was about ? (metric tons), and the cement consumption in the whole world was about ? (metric tons)See Answer
• Q9: 3. Calculate the material cost of the concrete for a rectangular parking garage slab with the dimension of 40-feet by 100-feet. The concrete slab's thickness is 6-inch. Assuming the cost of concrete is \$140 per cubic yard (yd³).See Answer
• Q10: 6. Assign each of the following cements to one of the ASTM Types I to V: a. C:S = 55%, C2S = 21%, C3A = 11%, C4AF = 8%, fineness = 480 m2/kg b. C3S = 55%, C2S = 22%, C3A = 10%, C4AF = 8%, fineness = 380 m²/kg c. C3S = 44%, C2S = 34%, C3A = 4%, C4AF = 13%, fineness = 370 m²/kg%3D d. C3S = 30%, C2S = 45%, C3A = 6%, C4AF = 12%, fineness =320 m² kgSee Answer
• Q11: a) Determine the distance, c (which locates the neutral axis from the top of the beam) for the beam section shown below. b) Does the beam satisfy ACI minimum and maximum reinforcement limits? Use fc'=4X00 psi and fy=5X000 psi. See Answer
• Q12: Based on a structural analysis, an engineer decides to design the roof beam shown below such that the reinforcement ratio, p will always be 0.01X. Dead load includes beam self-weight.Determine if the design moment capacity (phi)Mn is greater than the factored design moment Mu. Use fc'-4X00 psi and fy 5X000psi See Answer
• Q13: 6) (400 points) Type a 1–2-page memo describing the tests and results of the hardenedconcrete tests. Be sure to include the following: a. A clear purpose/objective for the memo. (Hint: Whybeing tested?)are the concrete specimens b. Logical conclusions and recommendations based on the objective. c. Follow the writing resource guidelines. d. ALL tests and results ALL necessary calculations and figures in the appendix. f. Specify if the hardened concrete mix meets the requirements of the design. g. Give recommendations based on lab results.See Answer
• Q14: 1) (100 points) Use the test values obtained in lab to calculate the Compressive Strength,Modulus of Rupture, and Splitting Tensile Strength for the concrete. Create a table of the results that will be used in the body of the memo. Format the calculations for use in the attachments of the memo.See Answer
• Q15: 3) (100 points) What is the objective/purpose of the concrete memo?See Answer
• Q16: 2) (100 points) What are requirements for the hardened concrete?engineering equations and the mix strength design.) Did the mix meet the requirements?(Hint: use theSee Answer
• Q17: 4) (100 points) What tests were performed to meet this objective?See Answer
• Q18: The attached worksheet was obtained in a laboratory design of asphalt concrete mixture for medium traffic. Carry out the required analysis and hence complete the table. Using the average results for each asphalt content, plot the necessary graphs and determine the optimum asphalt content based on air voids content requirement. Verify whether the optimum asphalt content determined will meet the GHA dense-graded specifications for medium traffic given in the table below. Use the following specific gravity values for your analysis: Bulk specific gravity of aggregates, Ga=2.65, Specific gravity of bitumen (asphalt), Gs=1.02 You should show sample computations involved in your analysis. Marks will be awarded forclarity of DEssentation. Average values of parameters are not required in shaded regions on the laboratory worksheettable for Q but are required in the areas with a tick (V) for all asphalt contents. See Answer
• Q19: 4.9. Determine the nominal moment capacity of the section in Fig. 4. la using the reinforcement areas from Problem 4.1. f, = 60,000 psi.See Answer
• Q20: 4.6. Determine the service level moment capacity of the section in Fig. P4.1a if the allowable stress for concrete is 0.45 f'c and the allowable stress for the reinforcement is 30,000 psi. Use the areas of reinforcement from Problem 4.1.See Answer

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