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New meIhod of evaluating the compressive s匸rength of concrele in structures using BOSS ： Broken off Sp ime囗s by Sp【 itting Method was developed ． App ］ icabi ］ ity of BOSS sp imen was examined by comparingthe compresslve strength ofspecimens taken from a model structure by coring a ロd by BOSS ， Effeets of water − cement ra［io and the sampling height on compressive streng 山 were studied wi 【 h the variance analysis ． it wasconflrmed tha［high correlation was found between compressive strengths of BOSS and core ． Thus【 he BOSS based simple 『 brmuia may be applicable 【 o the prediction or compressive strength of concrete in st【 uctures ．

Ahigh − strength conorete with silica fume was placed in the fu11 ・ scale model column specimens and 匸 emperature histories and core compressive strengths were det 巳rmined ， Laboratery − scale specimens were prepared with the same concrete and their temperature histories and compressive strengths were compared with those of model columns ． Effects of testing parameters ， sucb as the numb 巳r of specimen in an adiabatic curing chamber ， thickness ofthermal

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