DEVELOPMENT OF SLAB CURLING EXTRACTION METHOD AND ANALYSIS OF CURLING EFFECTS ON ROUGHNESS OF JOINTED CONCRETE PAVEMENTS : 줄눈 콘크리트 포장의 컬링 추출기법 개발 및 컬링이 평탄성에 미치는 영향 분석

다국어 초록 (Multilingual Abstract)

The curling shapes of jointed concrete pavement are varied due to temperature and humidity differences throughout the depth of the slab. Since the curling may cause a change in the elevation of the slab, pavement roughness can vary due to curling. In a single day, changes in the curling shape may cause variations in the roughness index. Since the curvature of the slab due to curling and warping is significant for the structural and functional performance of jointed concrete pavement, a simple technique to measure the curling shape of a slab needs to be developed. This study investigates a method that evaluates the realistic roughness of the road while eliminating the curling effect. The direct measurement of curling is difficult and expensive. Therefore, in this study, a method that estimates the curling displacement from the profile data is suggested. Profile data are presented in a random wave form; however, the profile data can be considered as a combination of a number of harmonic waves. Among the combinations of the various wave profiles, the data corresponding to a uniform slab length existed in a particular wavelength range. Thus, the curling of the slab at any given time can be measured if the wave, which has a particular wavelength that corresponds to the slab length (the joint spacing) of the jointed concrete pavement, can be extracted from the profile data. Technically, the Power Spectrum Density Analysis, Fast Fourier Transform, and Inverse Fast Fourier Transform techniques were applied to the profile data in order to extract the curling of the slab. A Slab Curling Extraction Method (S.C.E.M) for jointed concrete pavement was developed via the use of the techniques and procedures suggested in this study. In addition, a user-friendly program was developed to calculate curling and to reevaluate the pavement roughness index when the curling has been eliminated. The developed program (T-IRI) was used to analyze the curling and the modified roughness of a Korean Test Road on the Jung-Bu Inland expressway and on a Hanam-Tongyoung Section of the Jung-Bu expressway. The curling displacement and the IRI interrelation tended to influence the IRI as the curling displacement increased. Furthermore, the modified IRI shows that the misleading IRI measurements of the daily curling were reduced by eliminating curling from the IRI evaluation. In addition, it was analyzed for various effect factors (slab length and subbase-type) by the 3-D finite element method (3D-FEM). The curling displacement decreased in the 8m joint spacing. In this study, 3D-FEM was used to compare and estimate the type of subbase. A larger curling displacement occurred in the crushed aggregate subbases compared to the lean concrete subbase. Based on the results obtained in the present study, the methods presented herein are interpreted as a little more reliable than slab curling when studying curling and its impact on the roughness index.

목차 (Table of Contents)

• Chapter 1. INTRODUCTION = 1
• 1.1 Background = 2
• 1.2 State of Problem = 3
• 1.3 Hypothesis = 4
• 1.4 Objectives and Scope = 4
• Chapter 2. LITERATURE REVIEW = 5
• 2.1 Slab Curling in Concrete Pavements = 6
• 2.2 The Influence of the Curling on the Roughness = 15
• 2.3 Roughness of Pavement = 17
• 2.4 Erratic Record of IRI = 20
• 2.5 Summary of Literature Review = 22
• Chapter 3. DEVELOPMENT OF A SLAB CURLING EXTRACTION METHOD FROM PRO = 23
• 3.1. Basic Theory = 24
• 3.2. A Slab Curling Extraction Method for Jointed Concrete Pavement = 36
• 3.3. Sensitivity Analysis of Slab Curling Extraction Method. = 36
• 3.3.1. Effect of the Length of the Profile Data = 36
• 3.3.2. Effect of Frequency Band Width in Filtering. = 37
• 3.4. Evaluate of Modified IRI = 40
• 3.5. Development of User Friendly Program(T-IRI) = 43
• 3.5.1. Introduction of T-IRI = 43
• 3.5.2. Procedures to Use T-IRI = 43
• Chapter 4. ESTIMATION OF SLAB CURLING AND MODIFIED IRI IN JUNG-BU I = 50
• 4.1. Jung-Bu Inland Test Road I = 51
• 4.1.1. Profile Data Collection = 51
• 4.1.2. Analysis of the Longitudinal Curling of a Slab in Jointed Concrete Pavement = 53
• 4.1.3. Analysis of the Continuously Reinforced Concrete Pavement Section = 56
• 4.1.4. A Method for Extraction of the Transverse Curling Shape of a Slab = 57
• 4.2. Relation of International Roughness Index and Curling = 62
• 4.2.1. Roughness Index Estimate that Considers Curling in the Test Road = 62
• 4.2.2. Roughness Index Decrease with Measurement Time as a Consequence of the Curling Effect in the Test Road = 69
• 4.3. Roughness Index Estimate that Considers Curling in the Jung-Bu Expressway Tongyoung-Hanam Section = 74
• 4.3.1. Pavement Profile Data Collection and Arrangement = 74
• 4.3.2. IRI Revision and Analysis that Consider the Effect of Curling in the Jung-Bu Expressway = 75
• 4.3.3. IRI of the Tongyoung Direction = 81
• 4.3.4. IRI vs. Curling in the Jung-Bu Expressway Tongyoung-Hanam Section = 83
• Chapter 5. EFFECTS OF SLAB LENGTH AND SUBBASE-TYPE ON CURLING = 86
• 5.1. Slab Curling in Concrete Pavement = 87
• 5.2. Effect of Slab Length = 92
• 5.3. Effect of Subbase Type = 96
• Chapter 6. CONCLUSIONS = 98
• References = 102
• APPENDICES = 107
• APPENDIX A = 107
• APPENDIX B = 117
• APPENDIX C = 129