Long-Term Strength Gain or High Strength Concrete as Monitored by Drilled Cores

by David J. Akers, Pre-Mixed Concrete Co, United States,
Richard Miller, Pre-Mixed Concrete Co, United States,

Document Type: Proceeding Paper

Part of: Serviceability and Durability of Construction Materials


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 | Structural strength | Strength of materials | Drilling | Material tests | Compressive strength | Comparative studies | Compression

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