Long-Term Strength Gain or High Strength Concrete as Monitored by Drilled Coresby David J. Akers, Pre-Mixed Concrete Co, United States,
Richard Miller, Pre-Mixed Concrete Co, United States,
Abstract: An evaluation was made of the relationship between standard cylinders, four-inch by eight-inch cylinders, and drilled cores. The evaluation results showed that the strengths obtained from drilled cores are highly dependent upon three factors: their tested orientation relative to that in the structure; the elevation of the core in the structure; and, the type of pre-test conditioning. A comparison of the core and cylinder compressive strengths indicates that the acceptance criteria of ACI 318, Section 4.7 may have limited applicability at the higher strength levels. Thus, it becomes very important that prior to core testing high strength concrete, the testing, conditioning, and acceptance criteria be agreed upon in advance and be rigorously followed.
Subject Headings: High-strength concrete | Cylinders | Drilling | Material tests | Structural strength | Compressive strength | Comparative studies
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