Problem 6: A concrete is mixed and used to cast abridge deck during a very cold weather withtemperatures below -10°C. Answer the followings:1) What would happen to concrete during early hoursafter casting?2) How would this impact the long term properties ofconcrete?3) How could you reduce the negative impact on concreteat such low temperatures? Explain?4) If the same concrete was cast under very hightemperatures, answer questions 1-3?5) If the same concrete was cast under normaltemperatures then exposed over many years to freezingand thawing cycles, describe why concrete may bedamaged and how to reduce this damage? Is there asimilarity between damage mechanisms as a result ofcasting under low temperatures and that from freezingand thawing?6) What are the threshold values for moisture content andpercentage of saturated pores to cause damage byfreezing and thawing? (Hint: Dry concrete will never bedamaged by freezing and thawing).

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would happen to concrete during early hours casting?

Fundamentals Of Construction Estimating

4th Edition

ISBN:9781337399395

Author:Pratt, David J.

Publisher:Pratt, David J.

Chapter11: Pricing Concrete Work

Section: Chapter Questions

Problem 4RQ

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Question

Problem 6: A concrete is mixed and used to cast a
bridge deck during a very cold weather with
temperatures below -10°C. Answer the followings:
1) What would happen to concrete during early hours
after casting?
2) How would this impact the long term properties of
concrete?
3) How could you reduce the negative impact on concrete
at such low temperatures? Explain?
4) If the same concrete was cast under very high
temperatures, answer questions 1-3?
5) If the same concrete was cast under normal
temperatures then exposed over many years to freezing
and thawing cycles, describe why concrete may be
damaged and how to reduce this damage? Is there a
similarity between damage mechanisms as a result of
casting under low temperatures and that from freezing
and thawing?
6) What are the threshold values for moisture content and
percentage of saturated pores to cause damage by
freezing and thawing? (Hint: Dry concrete will never be
damaged by freezing and thawing).

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