Building Materials, Third Edition

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B. Thermal conductivity of aggregate 2. Is a measure of its heat capacity

C. Thermal expansion 3. Is affected by difference in thermal

expansion of two different material

D. Durability of concrete 4. Is a measure of its ability to conduct

heat

Codes:

(a) A B C D (b) A B C D

1324 2413

(c) A B C D (d) A B C D

1423 2314

4. The aggregate crushing value of coarse aggregates, which is used for making concrete,
   which in turn is used for purposes other than wearing surfaces should not exceed
   (a) 30% (b) 40% (c) 45% (d) 50%


5. Which of the following coarse aggregate require minimum cement paste?
   (a) Rounded (b) Irregular (c) Angular (d) Flaky


6. For high strength concrete the best aggregate is
   (a) rounded (b) irregular (c) angular (d) all-in-aggregate


7. Aggregate affecting durability of concrete most are
   (a) rounded (b) all-in-aggregate
   (c) flaky (d) irregular


8. The best reflection of strength of coarse aggregate is given by
   (a) crushing (b) impact
   (c) 10 per cent fines (d) hardness


9. Which of the following pairs is not matched correctly with regards to coarse aggregate?

   
   

   10 mm?
   (a) Strength 10 per cent fine
   (b) Toughness Impact test
   (c) Hardness Abrasion set
   (d) Sp. gr. Pyconometer

   
   

   
   

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1. (d) 2. (a) 3. (b) 4. (c) 5. (a) 6. (c) 7. (c) 8. (a) 9. (d)