^<14>C abundances : An index for weathering of concrete construction(Proceedings of the 20^<th> Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2007)

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  • コンクリート風化の超長時間評価指標としての石灰質砂岩の ^<14>C存在度変化(第20回名古屋大学年代測定総合研究センターシンポジウム平成19(2007)年度報告)

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^<14>C abundances are measured across a weathering rind formed in Triassic calcareous sandstone. ^<14>C has not been detected by our sensitive AMS in the fresh sandstone, while about a half amount of the present ^<14>C is detected in the weathering rind of the sandstone. 14C is found to be a sensitive index of concrete weathering. The fresh concrete made from natural limestone does not contain any ^<14>C. Weathering in atmospheric condition will replace the dead carbon in the concrete with radiogenic ^<14>C and will be able to detect easily.

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