Performance of High Content Reclaimed Asphalt Pavement (RAP) in Asphaltic Mix with Crumb Rubber Modifier and Waste Engine Oil as Rejuvenator
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials Properties
2.2. Experimental Process and Mix Design
2.3. Aggregate Gradation and Sample Preparation
2.4. Volumetric, Stability and Flow Properties, and OBC Determination
2.5. Mixes Performance Tests
3. Results and Discussion
3.1. Optimum Binder Content (OBC)
3.2. Marshall Parameters in OBC
3.3. Resilient Modulus (MR)
3.4. Moisture Susceptibility Test
3.5. Indirect Tensile Fatigue Test
3.6. Mass Loss (ML) Test
3.7. Performance Comparison Based on the Arbitrary Scale
- —
- If a test has a certain pass/fail value, it was given 1.0 point. However, if there is no standard requirement, the value of the R0 was assumed to be 1.0 point. Then, the points for other mixes were determined accordingly. For example: (1) according to PWD, the standard stability value is 8.0 kN. As the stability value of the R100 mix was 10.2 kN, thus the R100 mix gained 1.28 points; (2) PWD specifications do not have a standard MR value. According to the test result, the MR value of R0 was 13,544 mPa and was given 1.0 point. Since the MR value of the R100 mix was 16,966 mPa, therefore R100 mix gained 1.25 points.
4. Conclusions
- The OBC of all RAP mixes was below the R0 value. It was demonstrated that the OBC values decreased gradually as the RAP content increased. Furthermore, it was anticipated that the use of higher RAP percentages in the asphalt mixes would lead to a significant revenue in the related pavement construction field.
- The stability of all RAP mixes was higher than the R0 (10.2 kN) as well as the standard limits (8.0 kN). The increment of RAP content was found to increase the flow. The findings also showed that all RAP mixes satisfied the Marshall stability, flow, and volumetric properties criteria.
- The value of MR increased with the increment in RAP content. All RAP mixes were more resilient than the R0 except the R30 mix, in which the MR value obtained was 1.6% lower than the R0. Thus, it was concluded that the combined use of WEO and CRM was effective to obtain a balanced MR value.
- The TSR values of all RAP mixes were above the R0 (88.7%) and standard requirement (80%). Thus, it can be summarised that the RAP mixes were sufficiently resistant to moisture susceptibility.
- In terms of fatigue performance, the R30, R50, and R70 mixes produced a higher fatigue resistance compared to the R0. The R100 mix was approximately 5% less resistant to fatigue cracking than the R0.
- The lower threshold value (15%) of all mixes from the ML test showed promising results and indicated that the mixes were highly resistant to ravelling and sufficiently durable.
- The arbitrary scale was successfully developed as an effective performance evaluation method to determine the five major performance test results. The collective performance of all RAP mixes was higher than the R0 with increased performance as the RAP content increased. Therefore, 100% RAP mix can be used in ACW14 mix design without significantly reducing the asphalt mix’s performance.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Appendix A
Binder Content | Marshall Stability (kN) | Marshall Flow (mm) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
R0 | R30 | R50 | R70 | R100 | R0 | R30 | R50 | R70 | R100 | |
4.5% | 7.6 | 9.8 | 7.8 | 8.0 | 8.2 | 2.7 | 2.7 | 2.5 | 2.5 | 2.9 |
5.0% | 8.7 | 11.8 | 9.7 | 9.2 | 9.3 | 2.7 | 2.7 | 3.0 | 2.8 | 3.5 |
5.5% | 9.7 | 11.9 | 10.9 | 10.1 | 10.6 | 2.8 | 3.0 | 3.2 | 3.5 | 3.7 |
6.0% | 10.7 | 11.5 | 11.3 | 11.6 | 9.8 | 3.0 | 3.0 | 3.7 | 3.9 | 4.9 |
6.5% | 9.6 | 10.6 | 10.2 | 10.7 | 9.1 | 3.4 | 3.4 | 4.4 | 4.7 | 5.1 |
Binder Content | Density (g cm−3) | VIM (%) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
R0 | R30 | R50 | R70 | R100 | R0 | R30 | R50 | R70 | R100 | |
4.5% | 2.23 | 2.27 | 2.27 | 2.28 | 2.22 | 8.2 | 6.5 | 6.8 | 6.1 | 8.8 |
5.0% | 2.26 | 2.28 | 2.29 | 2.31 | 2.27 | 6.5 | 5.6 | 5.2 | 4.5 | 6.1 |
5.5% | 2.29 | 2.30 | 2.31 | 2.31 | 2.28 | 4.8 | 4.3 | 3.9 | 3.6 | 4.9 |
6.0% | 2.31 | 2.31 | 2.32 | 2.30 | 2.30 | 3.2 | 3.1 | 2.6 | 3.3 | 3.3 |
6.5% | 2.29 | 2.32 | 2.31 | 2.30 | 2.27 | 3.0 | 1.9 | 2.3 | 2.8 | 4.0 |
Binder Content | VMA (%) | VFB (%) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
R0 | R30 | R50 | R70 | R100 | R0 | R30 | R50 | R70 | R100 | |
4.5% | 17.9 | 16.5 | 16.7 | 16.1 | 18.4 | 54.5 | 60.3 | 59.1 | 62.0 | 52.5 |
5.0% | 17.4 | 16.6 | 16.3 | 15.7 | 17.1 | 62.9 | 66.6 | 68.3 | 71.2 | 64.6 |
5.5% | 16.9 | 16.5 | 16.2 | 15.9 | 17.0 | 72.0 | 74.2 | 76.1 | 77.6 | 71.7 |
6.0% | 16.7 | 16.5 | 16.1 | 16.7 | 16.7 | 80.5 | 81.6 | 83.7 | 80.3 | 80.4 |
6.5% | 17.5 | 16.6 | 16.8 | 17.3 | 18.4 | 82.7 | 88.3 | 86.6 | 83.8 | 78.0 |
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Test | Standard | NA | PWD Requirement (2008) |
---|---|---|---|
Los Angeles abrasion | ASTM C 131-14 | 25% | ≤25% |
Flakiness index | ASTM D 4791-05 | 7.3% | ≤25% |
Elongation index | ASTM D 4791-05 | 19.0% | - |
Soundness test (MgSO4) | AASHTO T 104 | 0.8% | ≤18% |
Property | Temp. (°C) | Standard | Virgin Binder | Modified Binder | Extracted Aged Binder |
---|---|---|---|---|---|
Penetration (100 g, 5 s, 0.1 mm) | 25 | ASTM D5 | 65 | 58 | 11 |
Softening point (°C) | - | ASTM D36 | 50 | 53 | 71 |
Ductility (cm) | 27 | ASTM D113 | >100 | 34.2 | - |
Rotational viscosity (20 rpm, cP) | 135 | ASTM D4402 | 366 | 644 | 3513 |
165 | 144 | 200 | 632 | ||
G*/sin δ (10 rad/s, kPa) | 58 | AASHTO T315 | 2.2 | 3.8 | 95.9 |
64 | 1.0 | 1.8 | 42.0 | ||
70 | 0.5 | 0.9 | 22.1 |
Mix Type | RAP (%) | NA (%) | Modified Binder Content (g/kg) | ||||
---|---|---|---|---|---|---|---|
4.5% | 5.0% | 5.5% | 6.0% | 6.5% | |||
R0 (control mix) | 0 | 100 | 45.0 | 50.0 | 55.0 | 60.0 | 65.0 |
R30 | 30 | 70 | 32.3 | 37.2 | 42.3 | 47.3 | 52.3 |
R50 | 50 | 50 | 23.8 | 28.8 | 33.8 | 38.8 | 43.8 |
R70 | 70 | 30 | 15.3 | 20.3 | 25.3 | 30.3 | 35.3 |
R100 | 100 | 0 | 2.6 | 7.6 | 12.5 | 17.6 | 22.6 |
Component | Mix Type | ||||
---|---|---|---|---|---|
R0 | R30 | R50 | R70 | R100 | |
OBC (%) | 5.9 | 5.8 | 5.6 | 5.5 | 5.5 |
Modified binder used (%) | 100.0 | 78.2 | 62.0 | 45.9 | 22.2 |
Binder amount saving (%) | 0.0 | 23.2 | 41.7 | 57.4 | 79.7 |
Mix Types | Marshall Parameters | ||||
---|---|---|---|---|---|
Stability (kN) | Flow (mm) | VIM (%) | VMA (%) | VFB (%) | |
R0 | 10.2 | 3.0 | 4.3 | 17.4 | 75.0 |
R30 | 11.9 | 3.1 | 3.6 | 16.5 | 78.5 |
R50 | 11.1 | 3.4 | 3.6 | 16.1 | 78.0 |
R70 | 10.4 | 3.4 | 3.6 | 16.0 | 77.0 |
R100 | 10.2 | 4.0 | 4.6 | 16.7 | 72.9 |
PWD limit | ≥8.0 | 2–4 | 3–5 | ≥14.0 1 | 70–80 |
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Khan, M.Z.H.; Koting, S.; Katman, H.Y.B.; Ibrahim, M.R.; Babalghaith, A.M.; Asqool, O. Performance of High Content Reclaimed Asphalt Pavement (RAP) in Asphaltic Mix with Crumb Rubber Modifier and Waste Engine Oil as Rejuvenator. Appl. Sci. 2021, 11, 5226. https://doi.org/10.3390/app11115226
Khan MZH, Koting S, Katman HYB, Ibrahim MR, Babalghaith AM, Asqool O. Performance of High Content Reclaimed Asphalt Pavement (RAP) in Asphaltic Mix with Crumb Rubber Modifier and Waste Engine Oil as Rejuvenator. Applied Sciences. 2021; 11(11):5226. https://doi.org/10.3390/app11115226
Chicago/Turabian StyleKhan, Md Zahid Hossain, Suhana Koting, Herda Yati Binti Katman, Mohd Rasdan Ibrahim, Ali Mohammed Babalghaith, and Obada Asqool. 2021. "Performance of High Content Reclaimed Asphalt Pavement (RAP) in Asphaltic Mix with Crumb Rubber Modifier and Waste Engine Oil as Rejuvenator" Applied Sciences 11, no. 11: 5226. https://doi.org/10.3390/app11115226