かぶりコンクリートの鉄筋腐食抵抗性能評価のためのドリルPR法の適用性の検討

摘要

Durability of reinforced concrete structure depends on the quality of the concrete cover that inhibits the rebar corrosion in concrete. Hence, for evaluating the performance of concrete cover to resist the rebar corrosion in concrete, authors proposed "Drill-PR method" using the permeability velocity and resistivity measured by the hole drilled in the surface of concrete. In this paper, several kinds of concrete were prepared for an experimental study on the application of Figg's intrusive method and resistivity test method (Wenner method) to the Drill-PR method. The Student's t-statistical analysis of the test results indicates a good capability of the air-permeability by Figg's intrusive method for evaluating the performance of concrete cover to resist the rebar corrosion. It was also known that the resistivity test method was significantly affected by the water cement ratio, moisture content of concrete and relative humidity. Based on the results of these experiments, authors proposed a classification for the performance of concrete cover to resist the rebar corrosion in concrete.%鉄筋コンクリート構造物が耐久性を確保するためには，コンクリrnート中の鉄筋腐食を抑制する役割を担うかぶり部のコンクリートrn（以下，かぶりコンクリートと称す）が，外的因子の侵入・拡散をrn最小限に止める性能を有することが重要となる。この性能は，かぶrnりコンクリートの品質に依存し，コンクリートは緻密であることがrn望まれる。これまで，鉄筋コンクリート構造物の耐久性向上を目的rnとして，材料面においては，鋭意に研究・開発が進められてきた。