長期材齢コンクリ-トの調査研究-6-福井県庁舎本館

概要

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An investigation was carried out on the 54 years old reinforcedconcrete building， Fukui Prefectural Office. The mainresults obtained are as follows1) The depth of alkali-lost in structural concrete was found tobe 5.2 cm in the first floor， which is about the twice of theestimated one from the ever presented formula. In the secondand the third floor， the value showed 3.6 cm and 1.9 cm respec“tively. The rust was observed on reinforcing steel surfacesin the co1umns at a half number of cases investigated.2) The mean value of compressive strength of concrete cores was240 kg/㎠ and the standard deviation was 54 kg/㎠.3) The mixing rpoportion of cement，fine and coarse aggregatewas evaluated as 1:1.82-2.07:2.88-5.02 in weight from theresult of 700℃ heating followed by hydrochloric acid treatmentof the concrete.
福井大学工学部の論文