Civil and Environmental Engineering Answers

12. What are the advantages of piers constructed monolithically with the bridge deck over usage of bearings?

9. How to determine the size of elastomeric bearings?

2. What is “preset” during installation of bridge bearings?

6. Sometimes the side of concrete bridges is observed to turn black in colour. What is the reason for this phenomenon?

19. What is the purpose of carrying out water absorption test for precast concrete pipes?

1. In soil compaction test, if a test result exceeds 100%, should engineers accept the result?

28. In modeling a nonrigid mat foundation by using elastic springs, should a uniform modulus of subgrade reaction be used along the whole base of mat?

8. According to Gay-Lussac law for a perfect

gas, the absolute pressure of given mass varies directly as

(a) temperature  

(b) absolute

(c ) absolute temperature, if volume is kept

constant

(d) volume, if temperature is kept constant

(e) remains constant,if volume and

temperature are kept constant

11. Nowadays, most flap valves are made of HDPE. What are the advantages of using HDPE when compared with cast iron?

9. What are the functions of bedding under stormwater drains?