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Q: Which of the following is included in the extreme environment exposure condition in the analysis of pre-stressed concrete?
  • A. Concrete exposed to condensation and rain
  • B. Concrete in contact with or buried under aggressive sub soil/ ground water
  • C. Members in direct contact with liquid/solid aggressive chemicals
  • D. All of the above
Correct Answer: Option C - According IS 1343:2012 Environmental exposure conditions- (i) Mild - Concrete surfaces protected against weather or aggressive conditions, except those situated in coastal areas. (ii) Moderate - Concrete surfaces shattered from severe rain of freezing whilst wet. Concrete continuously under water. concrete in contact or buried under non aggressive soil/ground water. (iii) Severe - Concrete surfaces exposed to severe rain, alternate wetting and drying or occasional freezing whilst wet or severe condensation. concrete exposed to coastal environment. (iv) Very Severe - Concrete surfaces exposed to sea water spray corrosive fumes or sever freezing conditions whilst wet concrete in contract with or buried under aggressive sub soil/ground water. (v) Extreme - Surface of members in tridal zone and splash zone. Member in direct contact with liquid/solid aggressive chemicals
C. According IS 1343:2012 Environmental exposure conditions- (i) Mild - Concrete surfaces protected against weather or aggressive conditions, except those situated in coastal areas. (ii) Moderate - Concrete surfaces shattered from severe rain of freezing whilst wet. Concrete continuously under water. concrete in contact or buried under non aggressive soil/ground water. (iii) Severe - Concrete surfaces exposed to severe rain, alternate wetting and drying or occasional freezing whilst wet or severe condensation. concrete exposed to coastal environment. (iv) Very Severe - Concrete surfaces exposed to sea water spray corrosive fumes or sever freezing conditions whilst wet concrete in contract with or buried under aggressive sub soil/ground water. (v) Extreme - Surface of members in tridal zone and splash zone. Member in direct contact with liquid/solid aggressive chemicals

Explanations:

According IS 1343:2012 Environmental exposure conditions- (i) Mild - Concrete surfaces protected against weather or aggressive conditions, except those situated in coastal areas. (ii) Moderate - Concrete surfaces shattered from severe rain of freezing whilst wet. Concrete continuously under water. concrete in contact or buried under non aggressive soil/ground water. (iii) Severe - Concrete surfaces exposed to severe rain, alternate wetting and drying or occasional freezing whilst wet or severe condensation. concrete exposed to coastal environment. (iv) Very Severe - Concrete surfaces exposed to sea water spray corrosive fumes or sever freezing conditions whilst wet concrete in contract with or buried under aggressive sub soil/ground water. (v) Extreme - Surface of members in tridal zone and splash zone. Member in direct contact with liquid/solid aggressive chemicals