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|Title:||Tests of selected insulating materials for mass concrete|
|Authors:||United States. Army. Office of the Chief of Engineers.|
Roshore, E. C.
Thornton, Henry T.
|Publisher:||Concrete Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; C-70-4.|
Abstract: During the early ages of mass concrete construction, the interior of the concrete mass can be at temperatures well above freezing while the bulkhead and lift surfaces are being subjected to subfreezing temperatures. This condition can result m thermal cracking of the concrete mass structures. The purpose of this program was to investigate various types of materials available for insulating mass concrete. Several of the most promising materials were selected for laboratory tests. The physical and thermal properties of these selected materials were determined under a variety of conditions in the laboratory. The overall heat-transfer characteristics of the materials were determined by using them to insulate standard 2-ft concrete cubes under different temperature, wind-velocity, and moisture conditions in the laboratory. Thermal gradient data were developed using both insulated and uninsulated cubes. Outdoor weathering tests were conducted and the insulating properties of several of the materials were compared before and after the outdoor weathering. A selected foamed-in-place insulation material was tested under field conditions on rough horizontal and vertical surfaces. Only one of the materials tested is considered satisfactory for the long-term field insulation of mass concrete structures; four materials are considered satisfactory for short-term insulation (15 to 20 days) in the field; two of the materials are not considered satisfactory for either short- or long-term field use. The foamed-in-place insulating material adheres satisfactorily to both horizontal and vertical concrete surfaces under both wet and dry conditions and can be removed without great difficulty. However, this type of material probably could not be used in vertical forms due to a pressure buildup caused by self-restriction of upward movement of the foam.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Documents|