23CE62R08_MTech_kljhkjhbiuhlihbivPROJECT1.pptx

long term performance of mixtures containing rap

1. Department of Civil Engineering Indian Institute of Technology Kharagpur Spring 2024 PROJECT-1 Long-term Performance of Mixtures Containing Recycled asphalt mixture(RAP) Adarsh Agrahari 23CE62R08 1

2. CONTENT 2 Introduction Literature review Research gap Objective Methodology Conclusion Future scope References

3. INTRODUCTION 3 Distresses that pavement undergo over time, such as rutting cracking and Aging caused by traffic load, temperature variation and rainfall. Milling operations on deteriorated asphalt pavement generate reclaimed asphalt pavement (RAP). Recycling technology can play a vital role in reusing RAP to restore pavement performance. Reducing environmental pollution associated with RAP disposal.

4. INTRODUCTION Contd … 4 However long-term performance of mixtures containing high percentages of RAP remains a significant concern for transportation agencies and pavement engineers.

5. L ITERATURE REVIEW 5 Paper compares long-term performance of virgin and RAP mixtures. Focuses on Asphalt Concrete (AC) overlays. Compares virgin and 30% RAP mixtures. This study have been conducted on mixtures using LTPP data(FHWA USA).

6. LITERATURE REVIEW 6 This literature review can be divided in three parts, a) Data selection b) Data analysis c) Long-term Performance of Mixtures analysis, It uses three approaches: Explorative data analysis, N on-parametric survival analysis, P aired-t test.

7. LITERATURE REVIEW 7 The key findings of the paper are as follows: 1. Mixture Performance is function of overlay thickness, and pre-overlay treatment method. 2. Thin RAP overlays(51mm), minimal pre-overlay treatment lead to undesirable performance. 3. Thick RAP overlays(127mm), with pre-overlay treatment, excel in rutting, roughness, without inducing cracks.

8. LITERATURE REVIEW 8 4. The survival probabilities of the non-RAP sections are typically higher than those of the RAP sections in cracking. 5. Non-RAP sections show significantly less fatigue cracking than RAP sections except for thick overlays with intensive pre-overlay treatment.

9. LITERATURE REVIEW 9 Fig: 2.1 Fatigue cracking survival functions of 4 experiments based on data from 18 sites Source: Yuhong Wang (2016)

10. LITERATURE REVIEW 10 Fig: 2.2 Longitudinal cracking survival function of 4 experiments based on data from 18 sites Source: Yuhong Wang (2016)

11. LITERATURE REVIEW 11 Fig: 2.3 Transverse cracking survival function of 4 experiments based on data from 18 sites Source: Yuhong Wang (2016)

12. LITERATURE REVIEW 12 Fig: 2.4 Rutting survival function of 4 experiments based on data from 18 sites Source: Yuhong Wang (2016)

13. R ESEACH GAP 13 Environmental factors (moisture and temperature) not considered. I nfluence of cracks from existing pavements on overlay performance, especially with thin overlays and minimal pre-overlay treatment. Effect of modifiers on crack resistance not explored. Traffic loading effect not considered.

14. OBJECTIVE 14 To study long term performance of RAP overlays including all factors such as environmental factors, traffic loading, condition of existing pavement, pre overlay treatment and overlay thickness using LTPP data.

15. Data selection long term performance analysis explorative data analysis non-parametric survival analysis paired-t test METHODOLOGY

16. CONCLUSION Based on above study we can expect following results. Better understanding of long term performance of RAP mixtures. Higher temperature differentials may exacerbate cracking. Increased moisture content may exacerbate cracking especially in thin overlays with minimal pre-treatment. In regions with severe distresses in the underlying pavement, the use of RAP overlays may be less effective.

17. Investigate the influence of different types of pre-overlay treatments. Impact of climate conditions on the performance of RAP-containing mixtures compared to virgin mixtures in various regions. Exploring Advanced modeling techniques such as machine learning algorithms. Collaboration with industry partners to implement findings from this study. FUTURE SCOPE

18. REFERENCES 18 Hongren Gong; Baoshan Huang; Xiang Shu,(2018), “Field performance evaluation of asphalt mixtures containing high percentage of RAP using LTPP data”,Construction and Building Materials Volume 120, 1 September 2016, Pages 335-348 Jo Sias Daniel; Nelson Gibson; Sean Tarbox; Audrey Copeland & Adrian Andriescu , (2013), “Effect of long-term ageing on RAP mixtures laboratory evaluation of plant-produced mixtures” Road Materials and Pavement Design, 14:sup2, 173-192 Yuhong Wang,(2016), “The effects of using reclaimed asphalt pavements (RAP) on the long-term performance of asphalt concrete overlays” Construction and Building Materials Volume 120, 1 September 2016, Pages 335-348

19. THANK YOU 19