Morse Brothers, Inc. Harrisburg plant : high-strength concrete : research study.
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1987-07-01
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Abstract:This report is the seventh in a series of research studies designed to determine the difference in strength of concrete cylinders cast in steel molds vs. cylinders cast in plastic molds. Prior to this report, six other research studies on the difference in compressive strength of Portland cement concrete cylinders cast in steel and plastic molds were conducted by the Oregon State Highway Division (OSHD) Materials Section. The purpose of these reports was to determine the quantity of strength difference for different classes of concrete from different suppliers, as well as the possible cause of the strength difference such as flexibility, method of vibration, method of transport, curing conditions, etc. The results of these six studies are summarized in Concrete Cylinder Mold Investigation Summary Report, Oregon State Highway Division Materials Section, March 12, 1987.
This research study was designed to determine which mold (steel, plastic, or tin) produces concrete strength that is most representative of actual strength in a concrete slab structure as determined from concrete cores and tine molds embedded in the slab. In addition, further comparison of the strength difference in mold type and method of field curing were made.
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