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ASSIGNMENT QUESTIONS - 14071_585
ASSIGNMENT QUESTIONS - 14071_587

Engineering Aid 2 - Intermediate Structural engineering guide book
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11-64. When you are determining bulk specific gravity, the aggregate should be in what condition? 1. Oven-dried 2. Air-dried 3. Super-saturated 4. Saturated, surface-dried 11-65. Absorption represents what moisture content of the aggregate? 1. The surface moisture 2. The aggregate at SSD 3. The  aggregate  super-saturated 4. The quantity of water required for the mix 11-66. What is the recommended length of time to soak your sample for the specific gravity test? 1. 6 hours 2. 12 hours 3. 18 hours 4. 24 hours 11-67. What procedure assists you in determining when fine aggregate has reached SSD? 1. The wet shaking test 2. The water-absorption cone and  tamper  method 3. The  pycnometer 4. The Atterberg limits test 11-68. The oven-dried fines sample weighed 485 grams. What was the percentage of absorption? 1. 1.5% 2. 2.0% 3. 2.5% 4. 3.0% Learning  Objective:  Identify admixtures used for concrete and the effects they have on concrete characteristics. 11-69. What  results  are  obtained  by adding accelerators to concrete? 1. Higher  rate  of  heat  production 2. Slows  the  hydration  process 3. High-early-strength   concrete with  a  lower  strength 4. Full hydration does not occur 11-70. The  workability  of  concrete  is governed by the amount of aggregate in the mix. When the aggregate cannot be reduced, what admixture  should  you  use? 1. Calcium  chloride 2. Fly  ash 3. Pozzolan 4. Each of the above 11-71. Dense  concrete  is  required  in what type of concrete work? 1. Prestressed   structures 2. Overhead  pours 3. Load-bearing  walls 4. Runways 11-72. The  critical  period  in  the  curing process of concrete occurs at what time frame? 1. From the day of placement through the 10th day 2. From  the  day  after  placement through the 10th day 3. From the day of placement through the 14th day 4. From the day of placement through the 28th day 11-73. What  is  the  ideal  temperature ranges  for  concrete  work? 1. Below 35° 2. Between 35° and 50° 3. Between 55° and 70° 4. Between 70° and 90° 80







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