STUDY ON NON-DESTRUCTIVE EVALUATION OF HARDENING PROCESS BY NEAR-INFRARED SPECTROSCOPY

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  • HOSHI Kenta
    TAIHEIYO CEMENT CORPORATION, Central Research Laboratory（2-4-2, Osaku, Sakura-shi, Chiba 285-8655, Japan）
  • SUMIYOSHI Yujiro
    TAIHEIYO CEMENT CORPORATION, Central Research Laboratory（2-4-2, Osaku, Sakura-shi, Chiba 285-8655, Japan）
  • KOIKE Kotaro
    TAIHEIYO CEMENT CORPORATION, Central Research Laboratory（2-4-2, Osaku, Sakura-shi, Chiba 285-8655, Japan）
  • MORI Hiroaki
    TAIHEIYO CEMENT CORPORATION, Central Research Laboratory（2-4-2, Osaku, Sakura-shi, Chiba 285-8655, Japan）

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Other Title
  • 近赤外分光法によるモルタルの硬化過程の非破壊評価に関する検討

Abstract

<p>Recently, the application of near-infrared spectroscopy has been considered as one of the new inspection methods for concrete structures. This method is a nondestructive analysis method that does not require sampling, and can detect deteriorated materials and cement hydrates in-situ within a few seconds using a small and lightweight instrument. This study aims to apply this method to the evaluation of the hardening process of concrete, and compared this method with conventional methods for evaluating the hardening process such as measuring the cumulative heat of hydration obtained using a conduction calorimeter, determination of Ca（OH）2 content by TG-DTA, setting time test and compressive strength test, using cement paste and mortar as samples. As a result, the near-infrared spectrum of cement paste and mortar showed absorption peaks of H2O, Ca（OH）2 and C-S-H overlapping each other. It was also found that there is a correlation between the change over time of the spectrum in the absorption wavelength range of cement hydrates and the change over time of rate of heat liberation and Ca（OH）2 content. Furthermore, it was considered possible to predict setting time and compressive strength by extracting the effect of absorption by cement hydrates from the spectrum through numerical processing such as statistical analysis.</p>

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