cchrc

CCHRC Research and Testing Facility (RTF)

Cold-Pour Concrete Monitoring

The Cold Climate Housing Research Center is hosting a new cold-weather concrete mixture demonstration site. The test pours are being supported by SpringBoard. SpringBoard is a component of the Juneau Economic Development Council, a nonprofit corporation based in Alaska. SpringBoard and the Department of Defense are partners for this work. Funding support is also being provided by the Alaska University Transportation Center (AUTC), and the U.S. Army Cold Regions Research and Engineering Laboratory. Additional support was provided by University Ready Mix, Yukon Equipment and Geo-Watersheds Scientific.
New ContentFairbanks Daily News-Miner article on test pours.

North Bay 10" Test Slab

The 10" Slab has 2" of underlying blueboard insulation and is approximately 10 feet by 20 feet. The slab will be used as the future home for a test generator to incorporate hybrid fuels. There are three temperature profile measuring points. Each profile has 5 sensors locations. One set of sensors is located 0.5" from the top of the concrete pad, another set is located 5" from the top, and once set at the base of the concrete pad. An additional sensor is is located at the bottom of the insulation, and a final sensor is located approximately 6" down into the underlying earth fill material. The full pour for the slab started approximately at noon on 3/28/06. Data collection started before the pour to help show the initial conditions.
The applied concrete initially is above freezing. After initial placement, the concrete will start to cool until the heat of hydration begins. The slab temperature will then increase for a period of time. Near the center of the slab, were there is more thermal mass, the temperatures will be the highest. The temperature in the pad near the edge will be colder due to the greater heat loss at the edges. The temperatures in the slab near the corners will have the greatest heat loss and coldest temperatures.
The following figures show temperature profiles in various location in the test pad. During the initial concrete pour and curing period, data is shown for the most recent 2-day and 7-day periods.

Plot Period Center Profile Side Profile Corner Profile Comments
7-Day Fig 4 Fig 5 Fig 6 Most recent 7 days
14-Day Fig 13 Fig 14 Fig 15 Most recent 14 days
2-Month Fig 19 Fig 20 Fig 21 Most recent 1-2 months

South Bay Patio Slab, 5-6" slab, No Insulation

[ Sensors for the South Bay Patio have been moved - changes to this page are pending. ]
The 5-6" Patio Slab does not have any underlying insulation. The slab is typical of a patio or walkway. The thickness of the slab varies some due to the preparation characteristics of frozen ground. There are three temperature profile measuring points. Each profile has 5 sensors locations. One set of sensors is located 0.5" from the top of the concrete pad, another set is located halfway between the top and bottom of the slab, and once set at the base of the concrete pad. A final sensor is located approximately 6" down into the underlying earth fill material. The full pour for the slab started approximately at 10:00am on 3/28/06. Data collection started before the pour to help show the initial conditions.
The following figures show temperature profiles in various location in the test pad. Data was shown for the initial concrete pour and curing period, however we are not collecting data from these sensors at this time, so some links have been temporarily disabled.

Plot Period Center Profile Side Profile Corner Profile Comments
7-Day -- -- -- Most recent 7 days
14-Day -- -- -- Most recent 14 days
2-Month -- -- -- Most recent 1-2 months

Instrumentation and Environmental Sciences Supporting Partners
GW Scientific and Campbell Scientific Inc.

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Engineering and Environmental Internet Solutions

Last Modified: 02Oct07