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ASSIGNMENT QUESTIONS - 14071_587
ASSIGNMENT QUESTIONS - 14071_589

Engineering Aid 2 - Intermediate Structural engineering guide book
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ASSIGNMENT  12 Textbook  Assignment:  “Material  Testing.”  Pages  13-29  through  13-51. Learning  Objective:  Identify tests  required  for  concrete construction  quality  control. Identify  procedures  used  for preparing  and  performing  these tests. 12-1. What is the purpose of the slump test? 1. To measure the water content 2. To check the cement content 3. To check the workability of the  mix 4. To check aggregate cohesiveness 12-2. Which of the following effects are associated with excessive bleeding of the concrete mix? 1. Increased  water-cement  ratio in the mix 2. Increased  water-cement  ratio near  the  surface 3. A weaker lower layer but increased  surface  durability 4. Lack of water migration and slower  hydration 12-3. What is the desired quantity of air for an air-entrained mix? 1.  4.0  to  7.5  percent  of the cement 2.  4.0  to  7.5  percent  of the water 3.  4.0  to  7.5  percent  of the  total  aggregate 4.  4.0  to  7.5  percent  of the  total  mix 12-4. When you are determining the unit weight, what is the purpose of tapping the side of the sample container after rodding? 1. To allow the sample to settle similar to actual placement 2. To  remove  air  pockets 3. To  cause  segregation  of  the aggregate 4. To determine the air content by  the  weight  differential 12-5. What is the minimum number of cylinders  required  for  a compressive strength test? 1. One 2. Two 3. Three 4. Four 12-6. The  diameter  of  the  test  specimen for  compressive  strength  is determined  to  the  nearest 1. 0.001  inch 2. 0.05   inch 3. 0.01   inch 4. 0.1 inch 12-7. The test load is applied to the cylinder  at  what  constant  rate? 1. 10 to 20 psi 2. 20 to 40 psi 3. 30 to 50 psi 4. 20 to 50 psi 12-8. When the flexural-strength test is performed, the load is applied to what portion of the beam? 1. Sides 2. Ends 3. Top 4. Bottom 82







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