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ASSIGNMENT QUESTIONS - 14071_584
ASSIGNMENT QUESTIONS - 14071_586

Engineering Aid 2 - Intermediate Structural engineering guide book
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11-52. When seawater is used to mix concrete, what compensation must be made to maintain compressive strength? 1. Increase the water-cement ratio 2. Decrease the water-cement ratio 3. Use Type III cement 4. Use waterproofed cement 11-53. Aggregate should have what shape to increase workability? 1. Rounded 2. Subrounded 3. Subangular 4. Angular 11-54. What is the maximum size a coarse aggregate should be in a heavily reinforced slab, 7 inches thick? 1. 1 inch 2. 2 inches 3. 1 1/2 inches 4. 2 1/2 inches 11-55. To remove silts, clays, and organic material in the aggregate to be used in a concrete mix, which of the following actions should you take? 1. Drying 2. Burning 3. Washing 4. Heating 11-56. What is the recommended amount for the sampling of a stockpile that is used for the tests? 1. The amount needed 2. Twice the amount needed 3. Three times the amount needed 4. Four  times  the  amount  needed 11-57. What is the name of the value that gives a relative measure of the proportions of fine and coarse particles in an aggregate? 1. Fineness  module 2. Gradation  of  the  sample 3. Aggregate   grading 4. Gradation  limits 11-58. When you test the aggregate for soundness, what test, other than the freeze-thaw test, may be performed? 1. Fines  test 2. Color test 3. Salt test 4. Wash test 11-59. What is the recommended amount of fines in concrete to achieve good workability? 1. 0.0 to 1.0 percent 2. 1.1 to 2.9 percent 3. 3.0 to 5.0 percent 4. Above 5 percent 11-60. When the percentage of fines in a sample is 5 percent and the dry weight is 1,995 grams, what is the original dry weight of the sample? 1. 1,895  grams 2. 2,005  grams 3. 2,095  grams 4. 2,100  grams 11-61. When you test for undesirable lightweight  material,  what  is the size of sieve used for coarse aggregate? 1. 1/4 inch 2.   No.   4 3. No. 10 4. No. 50 11-62. When do you perform the test for  clay  lumps? 1. Before sieve analysis 2. After  sieve  analysis 3. After  washing 4. Both 2 and 3 above 11-63. You have performed the color test and determined that organic material  is  present  in  the  sand. Which of the following options should be taken? 1. Find  a  replacement  sand 2. Wash the existing sand 3. Use a lower water-cement ratio 4. Each of the above 79







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