Evaluation of Strength Criteria for Opening Traffic on Concrete Pavement
콘크리트 포장의 교통 개방을 위한 강도 기준평가
- 주제(키워드) 도움말 Traffic opening strength , strength requirement , strength criteria , opening traffic , traffic loading , curling stress , fatigue damage , early age
- 발행기관 강릉원주대학교 일반대학원
- 지도교수 도움말 이승우
- 발행년도 2024
- 학위수여년월 2024. 8
- 학위명 석사
- 학과 및 전공 도움말 일반대학원 토목공학과
- 실제URI http://www.dcollection.net/handler/kangnung/000000011789
- UCI I804:42001-000000011789
- 본문언어 영어
초록/요약 도움말
Traffic opening strength criteria is the allowable strength to start a vehicle on concrete pavement at early age without causing significant damage. A number of criteria were developed by different agencies based on empirical judgements. However, those criteria do not consider the effect of the strength criteria in different traffic types, slab thicknesses, base type, and seasons. The ACI criterion was developed based on the concept of acceptance minimum damage, allowing for a more comprehensive consideration of traffic conditions, slab thicknesses, and base type. However, this criterion was developed without consideration of the damage caused by the curling stress due to the temperature gradient in pavement slabs. The objective of this study is to provides a rational strength criterion for opening traffic on concrete pavements, considering the damage due to the curling stress as well as traffic loadings. The tensile stress at critical location due to curling and traffic loading for various traffic opening strength criteria were evaluated every hour of early age in different seasons. Then, the fatigue damage during the early age was evaluated. During this process, the traffic opening strength criteria was determined as the evaluated damage which does not exceed an acceptable level. As a result, the traffic opening strength criteria were evaluated to ensure the acceptable damage level under the effects of the construction season, traffic type, slab thickness, and base type of concrete pavement. The results present traffic opening strength criteria in summer and spring under various conditions, which can assist road engineers in making decisions to prevent significant damage during the early age.
more초록/요약 도움말
콘크리트 포장의 초기 강도 기준은 차량이 콘크리트 포장에 큰손상을 주지 않고 통행할 수 있도록 허용되는 강도이다. 여러 기관에서는 경험적인 판단에 근거하여 다양한 기준을 개발하였으나, 이러한 기준은 서로 다른 교통 유형, 슬래브 두께, 기초 유형 및 계절에 따른 강도 기준의 영향을 고려하지 않는다. American Concrete Institute(ACI) 기준은 허용 가능한 최소 손상의 개념을 기반으로 개발되어 교통 조건, 슬래브 두께 및 기초 유형을 보다 포괄적으로 고려할 수 있도록 하였으나, 이 기준은 포장 슬래브의 온도 구배로 인해 발생하는 컬링에 의한 손상을 고려하지 않고 개발되었다. 이에 따라 본 연구에서는 교통 하중뿐만 아니라 컬링으로 인한 손상을 고려하여 콘크리트 포장의 교통 개방을 위한 합리적인 강도 기준을 제공하였다. 다양한 교통 개방 강도 기준에 대한 초기 강도를 시간별로 평가 하였으며, 컬링 및 교통 하중으로 인한 인장 응력을 계절별로 평가하였고, 이후 초기 강도 기간 동안의 피로 손상을 평가하였다. 이 과정에서 허용 가능한 수준을 초과하지 않는 손상을 산출하여 교통 개발 강도 기준을 결정하였고, 이를 통해 건설 계절, 슬래브 두께 및 콘크리트 포장의 기초 유형 교통 유형 등의 영향을 고려한 교통 개방 강도 기준을 평가하였다. 본 연구의 결과는 다양한 조건에서 여름과 봄철의 교통 개방 강도 기준을 제시하였으며, 이는 초기 강도 기간 동안의 손상을 방지하는 데 도움이 될 것으로 사료된다.
more목차 도움말
TABLE OF CONTENTS
ABSTRACT ............................................................................................................... I
TABLE OF CONTENTS ....................................................................................... III
LIST OF TABLES .................................................................................................. VI
LIST OF FIGURES ............................................................................................... VII
LIST OF ACRONYMS AND SYMBOLS ......................................................... VIII
INTRODUCTION ............................................................................. 1
1.1 RESEARCH BACKGROUND AND MOTIVATION .............................................. 1
1.2 OBJECTIVES ................................................................................................. 2
1.3 SCOPES......................................................................................................... 2
1.4 DISSERTATION OUTLINE ............................................................................... 3
LITERATURE REVIEW ................................................................. 5
2.1 TRAFFIC OPENING STRENGTH CRITERIA FOR PCC PAVEMENT ................... 5
2.2 EXISTING STRENGTH CRITERIA FOR OPENING TRAFFIC.............................. 5
2.3 SUMMARY OF LITERATURE REVIEW ............................................................ 7
STRATEGY TO DETERMINE THE TRAFFIC OPENING STRENGTH CRITERIA .......................................................................................... 9
3.1 STRATEGY .................................................................................................... 9
3.1.1 Acceptable Damage in Early Age .......................................................... 12
3.1.2 Strength Development of PCC Pavement .............................................. 13
3.1.3 Temperature Difference Along the Slab Depth in Early Age ................. 14
3.1.4 Fatigue Damage Concept ...................................................................... 15
3.1.5 Minimum Flexural Strength to Opening Traffic .................................... 16
3.2 SUMMARY .................................................................................................. 16
MODELING FOR TENSILE STRESS UNDER TRAFFIC LOADING AND CURLING................................................................................... 18
4.1 TEMPERATURE DIFFERENCE ...................................................................... 18
4.1.1 Setting Temperature Difference ............................................................. 20
4.1.2 Final Temperature Difference ................................................................ 21
4.1.3 Total Temperature Difference ................................................................ 22
4.2 TRAFFIC LOADING ..................................................................................... 24
4.3 STRUCTURAL ANALYSIS MODEL ............................................................... 26
4.3.1 PCC Surface Properties ........................................................................ 27
4.4 SUMMARY .................................................................................................. 29
EVALUATION OF TENSILE STRESS DUE TO TRAFFIC LOADING AND CURLING................................................................................... 30
5.1 THE LOCATION OF CRITICAL TENSILE STRESS .......................................... 30
5.2 THE CRITICAL TENSILE STRESS EFFECT BY VARIOUS CONDITION ........... 31
5.2.1 Effect of Construction Seasons .............................................................. 31
5.2.2 Effect of Traffic Types ............................................................................ 32
5.2.3 Effect of Slab Thickness ......................................................................... 33
5.2.4 Effect of Base Type ................................................................................ 34
5.2.5 Effect of Elastic Modulus....................................................................... 35
5.3 SUMMARY .................................................................................................. 36
EVALUATION OF FATIGUE DAMAGE DUE TO TRAFFIC OPENING STRENGTH CRITERIA .................................................................... 38
6.1 ACCUMULATION DAMAGE DUE TO TRAFFIC OPENING STRENGTH ........... 38
6.2 COMPARISON OF TRAFFIC OPENING STRENGTH CRITERIA ....................... 40
6.3 SUMMARY .................................................................................................. 41
CONCLUSION ................................................................................ 43
7.1 SUMMARY AND CONCLUSION .................................................................... 43
7.2 RECOMMENDATIONS FOR FUTURE STUDY ................................................ 44
SUMMARY (IN KOREAN) ................................................................................... 45
REFERENCES ........................................................................................................ 47
ACKNOWLEDGMENTS....................................................................................... 50
