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https://hdl.handle.net/11681/27321| Title: | Experiments with dry ice for cooling fresh concrete |
| Authors: | Porter, Leland C. |
| Keywords: | Dry ice Concrete--Cooling |
| Publisher: | United States. Bureau of Reclamation. Denver Office. |
| Series/Report no.: | Concrete Laboratory Report ; No. C-661 |
| Abstract: | In the Summer of 1952 tests were made to determine the efficiency of dry ice (solid CO₂) for cooling fresh concrete. Observations were also made to determine whether the concrete is adversely affected by its contact with the carbon dioxide gas liberated by the dry ice. Two mixes were made (one with and one without the addition of dry ice) and cylinders were cast for compressive strength tests at 1, 3, 7, and 28 days' age. The dry ice was crushed to about minus 3/8 inch in size and introduced into the mixer immediately, following the mix water. Calculations for quantities of dry ice were based theoretically on producing a temperature drop of about 10° F in the concrete. Only the heat of sublimation (heat required to change from a solid to a gas at the same temperature) was considered as it was assumed the gas would escape from the mixer as soon as formed and would not be effective in further cooling the concrete. Based on these calculations, 2.3 pounds of dry ice were added to 1-1/2 cubic feet of concrete, which amounts to 40.8 pounds of dry ice per cubic yard of concrete. An additional 0.9 pound of dry ice was included to cool the mixer drum. |
| Description: | Technical Report |
| Gov't Doc #: | Concrete Laboratory Report No. C-661 |
| Rights: | Approved for Public Release; Distribution is Unlimited |
| URI: | http://hdl.handle.net/11681/27321 |
| Size: | 10 pages/1.555 Mb |
| Appears in Collections: | Design and Construction Division. Engineering Laboratories Branch |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| USBR+Concrete+Laboratory+Report+No+C-661.pdf | 1.59 MB | Adobe PDF |  View/Open |