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pp.17-29
In jointed concrete pavements, the thermal expansion of slabs gradually accumulates under prolonged and repeated high-temperature conditions, thereby increasing the compressive stress. When the compressive stress exceeds a critical level, blow-up may occur. Because blow-up occurs abruptly and involves large deformations, driving safety can be affected significantly. Stress-relief joint installation and contraction-joint cleaning are widely recognized as representative measures for preventing blow-ups in in-service concrete pavements. Stressrelief joints are intended to reduce the compressive stress generated at a specified time by providing expansion space within the pavement when the slabs become integrated and restrained under high temperature. By contrast, contraction-joint cleaning delays slab integration even under higher-temperature conditions by removing debris and incompressible materials within the joints, which significantly affects the slab expansion behavior, thereby securing additional expansion space. However, the extent to which these methods can quantitatively delay the occurrence of blow-ups has not yet been sufficiently analyzed. Therefore, this study adopted the pavement growth and blow-up analysis model to analyze the effects of stress-relief joint installation and contraction-joint cleaning on the accumulation behavior of compressive stress and the timing of blow-up occurrence in jointed concrete pavements. In particular, the effects of ΔT (i.e., the difference between the maximum internal concrete temperature and the trigger temperature for pavement growth, TTPG), as well as alkali–silica reaction were considered. Here, the TTPG refers to the temperature at which all contraction joints within the expansion length are fully closed and the slabs are integrated. The results showed that the TTPG gradually decreased as the service life increased; Accordingly, ΔT increased, thus resulting in the continuous accumulation of compressive stress within the slabs. These findings suggest that the risk of blow-up may increase with pavement age, and that the timing and effectiveness of preventive measures must be quantitatively evaluated.
1. 서론
2. PGBA(Pavement Growth and Blow-upAnalysis) 모델
3. 응력 완화 줄눈 설치에 따른 Blow-up 예방 효과검토
3.1. 응력 완화 줄눈 설치에 따른 슬래브 내 압축 응력형성 메커니즘 분석
3.2. 응력 완화 줄눈 설치에 따른 Blow-up 발생 시기평가
4. 수축 줄눈 청소에 따른 Blow-up 예방 효과 검토
4.1. 수축 줄눈 청소에 따른 슬래브 내 압축 응력 형성메커니즘 분석
4.2. 수축 줄눈 청소에 따른 Blow-up 발생 시기 평가
5. 결론
감사의 글
REFERENCES
