논문 상세보기
pp.78-86
In korea, only small amount of nonstructural lightweight concrete is being used through indirect effects such as heat insulation property and soundproofing rather than structural elements due to lack of structural lightweight aggregates and lack of understanding about lightweight concrete development, etc. That`s why structural lightweight concrete to reduce weight has not been put to practical use. This study is a part of high strength lightweight aggregate concrete researches using lightweight aggregates and the purpose of this study is to find out the basic physical characteristics and tension cracking fracture characteristics of lightweight concrete. Crack Mouth Opening Displacement is measured through 3 point flexure experiment about notch beam. Load-CMOD characteristics are examined through rules of countries, characteristics of lightweight concrete and tension cracking fracture experiments. The degree of tensile characteristic alteration according to size changes of specimen and the characteristics about crack surface are analyzed. The changes of softening curve are analyzed and fracture energy is drawn through inverse analysis by the obtained Load-CMOD curve. To decide fracture energy and analysis parametric, inverse analysis is conducted and Ant Colony Method is conducted for optimization and then a way to find out optimal parameterization fracture energy is suggested.
2. 실험방법
2.1 골재의 종류
2.2 시편의 형상 및 배합과 양생
2.3 시편의 장치 및 실험방법
3. 실험결과
3.1 압축강도, 탄성계수, 공기량, 슬럼프 시험
3.2 골재별 하중-CMOD 실험 결과
4. ACO를 이용한 인장연화곡선과 파괴에너지도출
4.1 응력과 균열개구의 관계와 파괴에너지
4.2 인장연화곡선의 평균화
4.3 ACO 최적화기법
4.4 인장연화곡선 및 파괴에너지
5. 결 론
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