| Title |
Proposal of Spacing Distribution Index Reflected Actual Air Void Characteristics in Concrete |
| Keywords |
concrete;air void;SF(spacing factor);SDI(spacing distribution index);콘크리트;공극;간격계수;간격분포지수 |
| Abstract |
Spacing factor proposed by Power is a concept of averaging air void spacing composed of geometric models. Thus, there’s a limitation on simulating actual air void characteristics in concrete. This study presents SDI(spacing distribution index) to overcome the limitation of spacing factor. SDI is also evaluated through comparing SDI with SF(spacing factor). In this study, it was confirmed that SF decreased due to increasing air-entrainer content but SDI increased. This occurs because SDI is the area of spacing distribution curve and SDI increases with increasing the frequency of spacing. SDI is evaluated to have better coverage below 300 ㎛ of SF so that determination of critical point of SDI above 80% of durability index can be easily obtained with more reliability. SDI is the area of spacing distribution curve and reflects actual air void characteristics in concrete. A comparative study of SDI and results of freeze-thaw test will be performed later. |