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The report covers a limited investigation into the effect of freezing temperatures on fresh concrete. Durability and petrographic studies confirmed that concrete is damaged when exposed to freezing temperatures soon after placing. Determining extent of damage and identifying concrete which has been frozen are sometimes difficult. Fresh concrete was exposed to a temperature cycle similar to one observed during placement of concrete canal lining on the Columbia Basin Project. Beginning 0, 3, 5, and 6 hours after mixing, specimens were subjected to freezing in air at approximately 15 deg F for 8 hours, followed by gradual thawing in air for 16 hours to a maximum temperature of 65 deg F. After 7 days' continuous cycling, specimens were examined petrographically and tested for durability and compressive strength. Test results show that: (1) Seven-day compressive strengths increased from 31 to 50% of fog-cured control concrete as time lapse before first freezing increased from 0 to 6 hours. (2) Durability of concrete tested in an accelerated freeze-thaw cycle (1.5 hours at 10 deg F and 1.5 hours at 70 deg F) ranged from 26 to 49% of fog-cured control concretes. (3) Frost imprints were detected in all specimens, indicating permanent damage.
The report covers a limited investigation into the effect of freezing temperatures on fresh concrete. Durability and petrographic studies confirmed that concrete is damaged when exposed to freezing temperatures soon after placing. Determining extent of damage and identifying concrete which has been frozen are sometimes difficult. Fresh concrete was exposed to a temperature cycle similar to one observed during placement of concrete canal lining on the Columbia Basin Project. Beginning 0, 3, 5, and 6 hours after mixing, specimens were subjected to freezing in air at approximately 15 deg F for 8 hours, followed by gradual thawing in air for 16 hours to a maximum temperature of 65 deg F. After 7 days' continuous cycling, specimens were examined petrographically and tested for durability and compressive strength. Test results show that: (1) Seven-day compressive strengths increased from 31 to 50% of fog-cured control concrete as time lapse before first freezing increased from 0 to 6 hours. (2) Durability of concrete tested in an accelerated freeze-thaw cycle (1.5 hours at 10 deg F and 1.5 hours at 70 deg F) ranged from 26 to 49% of fog-cured control concretes. (3) Frost imprints were detected in all specimens, indicating permanent damage.
Freezing of Fresh Concrete
J. E. Oliverson (author)
1966
25 pages
Report
No indication
English
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