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For evaluation of concrete strength, the use of concrete cores with the length/diameter ratio less than unity is not allowed at present. Comparative tests on molded cylinders with a varying length/diameter ratio ranging from 0.4 to 2 have been carried out. The experimental investigation has indicated that very short specimens do not yield more variable results than longer specimens and are not more susceptible to the effect of end preparation either by grinding or capping. Based on the empirical results obtained, the formula for the strength correction factor for short cores previously proposed by the author is modified so as to apply to cores with the length/diameter ratio less than unity.
Reader in civil engineering, University of Hong Kong, Hong Kong,
Stock #: CCA10100J