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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: Compressive Strength of Concrete Cylinders by Sulphur, Rubber Capping and Grinding Methods
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Abstract:It is known that no matter how carefully a cylinder is finished, its end surface probably exhibits some irregularities. As required by AS 1012.9, the finished end of concrete cylinders must be capped or ground before being crushed for compressive strength. Sulphur and rubber capping are widely accepted methods. As an alternative, the ends of concrete cylinders can be ground using a grinding machine to achieve an appropriate surface profile. Data presented in this paper compares the effects of four types of cylinder end preparation methods on compressive strength, including sulphur capping, rubber capping, single end grinding and double end grinding. A total of 152 concrete cylinders measuring 100 x 200mm were used to obtain sufficient data for the statistical analysis. These concrete cylinders were crushed as per AS 1012.9 with compressive strengths ranging between 45MPa and 110MPa. It was found that concrete cylinders gave the highest and more consistent compressive strength results when double end grinding method was used. Also, it was demonstrated once more that sulphur and rubber capping methods achieved reasonable results for concrete up to 60MPa compressive strength. For concrete above 80MPa compressive strength, rubber capping method cannot be recommended while sulphur capping method can be used but the sulphur capping compound must have high compressive strength and the capping thickness must be 1-2mm.
Concrete Institute of Australia, International Partner Access.
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