Review of Residual Mechanical Properties of Concrete Mixed with Different Admixtures at High Temperatures

• 영문명: Review of Residual Mechanical Properties of Concrete Mixed with Different Admixtures at High Temperatures
• 발행기관: 한국화재소방학회
• 저자명: Youngjin Nam Wonchang Kim Taegyu Lee
• 간행물 정보: 『International Journal of Fire Science and Engineering』Vol. 37, No. 4, 33~42쪽, 전체 10쪽
• 주제분류: 공학 > 공학일반
• 파일형태: PDF
• 발행일자: 2023.12.31

영문 초록

In this study, we analyzed results reported in existing literature to examine the residual mechanical properties of concrete mixed with different admixtures. Ground granulated blast furnace slag (GGBFS), fly ash (FA), and metakaolin (MK) were selected as admixtures for analysis, and data reporting the residual compressive strength of concrete with different admixtures at high temperatures were analyzed. Then, with reference to the ordinary Portland cement (OPC) using 100% cement, prediction formulas for the residual mechanical properties of concrete were derived for each selected admixture, and the resulting values were compared with the values of codes used in international concrete specifications. The residual mechanical properties of concrete showed different results depending on the admixtures used, and the concrete mixed with MK showed a higher compressive strength than OPC at room temperature compared with the values of the existing codes. With increasing temperature of concrete exposure, the trend of compressive strength showed convergence to the values of the existing codes. At room temperature, concrete mixed with GGBFS or FA showed a trend of similar or lower compressive strength compared with that of the existing codes; however, with increasing temperature, the residual compressive strength exceeded that of American Concrete Institute (ACI) and CEN codes. Thus, at room temperature, concrete mixed with MK had excellent compressive strength, but with increasing temperature, concrete mixed with FA or GGBFS was observed to exhibit superior residual mechanical properties.

목차

1. Introduction

2. Research Process

3. Results

4. Conclusion

Author Contributions

Conflicts of Interest

Acknowledgments

References

키워드

Concrete Admixtures Residual mechanical properties High temperature