| The purpose of this study was to establish a diagnosis technique that allows quick and simple evaluation of the degree of deterioration caused by combined frost and salt damage (frost-salt damage) in concrete structures. In the study、 focus was placed on the theory of the surface scanning method、 which is a nondestructive approach that can be used to easily estimate the thickness of deteriorated areas from the surface、 and the technique was applied to diagnosis of frost-salt damage. The results revealed that surface scanning was effective as a nondestructive method of estimating the thickness of the deteriorated area affected by frost-salt damage with a certain level of accuracy、 and that the depth of parts where is lower than the threshold of frost resistance (relative dynamic modulus of elasticity: 60%) can be estimated from the slope of a graph created using the measurement data thus obtained.[*][*]本研究は，コンクリート構造物の凍害と塩害の複合劣化（以下，凍害等と称す）程度を簡便かつ迅速に評価できる診断技術の確立を目指すものである。ここでは，表面からの劣化部の厚さを非破壊で簡易に推定できる表面走査法の理論に着目し，凍害等の診断への応用を試みた。この結果，表面走査法は凍害等を受けた劣化部の厚さをある一定の精度で非破壊により推定する方法として有効であることと，測定で得られるグラフの傾きから耐凍害性の閾値（相対動弾性係数60%）を下回る部分の深さを推算できることが確認された。 |
