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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Shortcomings of Current Compression Strength Tests for HSC and a Proposed Solution
Author(s): I. Luker and S.W. Tabsh
Publication: Special Publication
Appears on pages(s): 545-556
Keywords: compressive strength; concrete; modeling; precision; strain; stress; testing
Abstract:This study discusses the possible ways in which the characteristics of a testing machine can influence the strength of a HSC specimen. Particular attention is given to the platen rotation, which is caused fundamentally by the eccentricity of the reaction force from the specimen, and results in non-uniform straining over the loaded area of the specimen. The strain gradient is measured by a parameter denoted “strain-ratio,” while the apparent strength is expressed by a parameter referred to “strength efficiency.” An empirical method for establishing the relationship between strength efficiency and strain ratio is described. This is done using batches of similar HSC specimens deliberately subjected to different degrees of non-uniform straining and compared to predictions using simple theory. It is found that the test results confirm the validity of the theoretical assumptions. Strain measurement between the loading platens during a regular compression strength test is suggested as a practical proposition due to its economic benefit.
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