Nano silica with rubber modified asphalt concrete mixes using marginal aggregate

Ppt on rubber modified asphalt

1. Application of nano -silica in rubber modified asphalt mix made with marginal aggregates Salma Begam Rasheda , M.tech (Transportation) Barnali Debnath , PhD schoolar Photo of the Presenter Affiliation Contact details International Conference on Advances in Construction Materials & Structures, 15-17 December 2021

2. Contents INTRODUCTION RESEARCH OBJECTIVES LITERATURE REVIEWS MATERIALS METHODOLOGY RESULTS AND DISCUSSIONS CONCLUSIONS FUTURE SCOPES REFERENCES 2

3. INTRODUCTION ASPHALT MODIFICATION- Since the 1970s, asphalt cements have undergone several forms of modification to improve performance of the asphalt concrete mix. Current increase in axle loads globally together with varying climatic conditions leads to rapid deterioration of pavements, to overcome such effects, pavement demands binder with higher performance than normal grade bitumen. Polymers enhance the adhesion between aggregates and bitumen in the mixture. 3

4. Continue… Natural Rubber latex is a polymer modifier of bitumen which is available in Tripura. Applications of nanomaterials in conjunction with polymers was found to be significant in enhancing bituminous binder properties due to excellent properties small particle size of nano materials which makes them easily blend and more compatible with bitumen. Over burnt brick aggregate could be an attractive alternative material . In this study the performance characteristics of composite NRL/Nanosilica modified binder were evaluated using OBBA as an alternative material. 4

5. RESEARCH OBJECTIVE To study the performance of natural rubber (NR) modified binder with Nanosilica additive by testing various physical and engineering properties. To investigate the effect of natural rubber and nanosilica modifier on the mechanical as well as volumetric properties. To investigate the optimum nanosilica content of the bituminous mixes by Marshall Mix design method. To study the performance characteristics like moisture susceptibility of unmodified and modified bituminous mixes. To determine the stability, permanent deformation, flow number characteristics of unmodified and modified bituminous mix. 5

6. MATERIALS Over burnt aggregate Bitumen Natural Rubber Latex Nanosilica 6

7. METHODOLOGY This chapter explain the experimental works performed in this research work. This study includes various tests such as properties of conventional aggregate, bitumen and bituminous mixes along with the properties of bitumen after adding natural rubber with nanosilica . All the test and design procedures are performed according to standard specifications like IS codes, MORTH, AASTHO, ASTM codes and BS EN codes as guides. All the tests related to material properties and pavement design is mentioned elaborately in these codes . 7

8. TESTS PERFORMED Properties test of Aggregate Properties test of Bitumen Marshall of UMB,NRMB and NR+NS modified bitumen ITS and TSR Retained MS Boiling water test Draindown test 8

9. Fig. Test performed Brick Aggregate UMB NRMB Penetration Test Softening point Test Specific Gravity Test Marshall Mix Design Indirect Tensile Strength Test Retained MS test Boiling water test Draindown test NR+NS Shape Test Specific Gravity Test Water Absorption Test Crushing Test Impact Test Abrasion Test 9

10. Pycnometer Impact Testing Machine Thickness Gauge and Length Gauge Los Angeles Abrasion Test Apparatus Crushing Testing Machine 10

11. Penetration Test Apparatus Marshall Testing Machine Indirect Tensile Strength Testing Machine 11 Natural rubber latex Nano silica

12. Mixing of latex with bitumen Mixing of nanosilica with bitumen Marshall sample Sample preparation 12

13. RESULTS AND DISCUSSION All tests were done as per specification mentioned in the standard codes. The chapter deals with the test results and discussions of the physical test, mix design and performance evaluation. 13

14. Marshall Stability Test Result 14

15. Comparison of ITS and TSR of UMB, NRMB and NR+3%NS 15

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17. Comparison of Retained MS of UMB, NRMB and NR+3%NS     17

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19. Draindown Test Result 19

20. Boiling Water Test UMB Mix NRMB Mix NR+3%NS Mix 20

21. Cost analysis The cost analysis conducted in this study mainly includes the initial material cost Cost analysis is done based on the quantity of materials required for preparing the top layer of selected road section which has a stretch of 1 km, width of 7 m and the thickness of bituminous layers is 100 mm. It is observed that the cost of natural rubber modified mixes is slightly lesser and the cost for UMB and NRMB mixes are almost same. Due to the higher cost of nano -silica, the NR+3%NS mix requires almost 16% higher amount as compared to the unmodified mixes. 21

22. Conclusion High amount of nano -silica in asphalt mix leads to a significant reduction in Marshall stability due to agglomeration. Optimum NS content can be taken at 3% by the weight of base binder . Stability after addition of NR (6%) increased by 32.81% and again increased by 22.17% after addition of 3% NS with this NRMB. TSR value for both NRMB and NR+3%NS is higher than UMB mix and values are more than 80% ( MoRTH specified min value) for both NRMB and NR+3%NS modified bitumen. But TSR value for NR+3%NS is higher than NRMB. The mixes made using NRMB and NR+3%NS showed a higher retained MS value as compared to UMB mixes. Retained MS ratio for NRMB is 10.38% higher and for NR+3%NS is 17.08% higher than the UMB mixes. 22

23. Continue..... Boiling water test has disclosed that NRMB and NR+3%NS mixes gave lower stripping areas in comparison to UMB mixes, indicating a lesser susceptibility to moisture damage. But the NR+3%NS showed less sensitivity to moisture damage than NRMB. Drain down value for NR+3%NS mixes is less than the NRMB mixes. Drain down value for NRMB was 0.17% and for NR+3%NS was 0.08%, both the values are less than the maximum allowable limit of 0.3%. The cost analysis indicates that the cost required for combined nano -silica and rubber modified mixes are higher as compared to the unmodified mixes, but the cost for NRMB and UMB mixes are almost similar. 23

24. References Paotong , Saravut , Pichai , (2020), “ Use of Natural Rubber Latex (NRL) in Improving Properties of Reclaimed Asphalt Pavement (RAP)” Prince of Songkla University, Hatyai , Songkhla , Thailand. Kumar, R., Juneja , D., (2019), “Effect of Natural Rubber on the Properties of Bitumen and Bituminious Mixes”, International Journal of Innovative Technology and Exploring Engineering (IJITEE). Shaffie , A.K, Kamaruddin , D., (2015), “Stripping Performance and Volumetric Properties Evaluation of Hot Mix Asphalt(HMA) Mix Design Using Natural Rubber Latex Polymer Modified Binder (NRMB)” Kumar,(2020) “ Application of Nano Silica to Improve Self-Healing of Bitumen Mixtures” , Department of Civil Engineering, Shri Vishnu Engineering College for Women (Autonomous), Bhimavaram , India. 24

25. Prajwal , Ganesh , (2019), “ Studies on fatigue performance of modified dense bituminous macadam mix using nano silica as an additive” Chinese Society of Pavement Engineering. Production and hosting by Springer Nature, ISSN: 1997-1400. Bala , Napiah , Kamaruddin , (2018) “Effect of nanosilica particles on polypropylene polymer modified asphalt mixture performance” Case Studies in Construction Materials 8 (2018) 447–454. Ezzat , Alaa , Zaki,T ., (2016), “Evaluation of Asphalt Binders Modified with Nanoclay and Nanosilica”, Procedia Engineering Volume 143, 2016, Pages 1260–1267. 25

26. THANK YOU 26