The Impact of Recycled Concrete Aggregate on the Stiffness, Fatigue, and Low-Temperature Performance of Asphalt Mixtures for Road Construction
Abstract
:1. Introduction
2. Materials and Test Methods
2.1. Material Composition and Sample Preparation
2.2. Complex Modulus and Fatigue Resistance Determination
2.3. Resistance to Low-Temperature Cracking
3. Results and Discussion
3.1. Complex Modulus
3.2. Fatigue Resistance
3.3. Resistance to Low-Temperature Cracking
4. Conclusions
- As a result of the high porosity and surface area of RCA, asphalt mixtures made with more than 30% RCA required significantly more bitumen than the control mixture (0.5–1%). However, mixtures with less than 30% RCA required up to 0.2% bitumen more than the control mixture.
- Regardless of the particle size distribution of the used RCA, or the quantity of RCA applied, the complex modulus values of asphalt mixtures containing RCA, with the exception of F-30, were 15–20% lower than those of the control mixture, which is most likely related to the increased OBC and air void content.
- Most RCA mixtures (except for F-45), showed better fatigue resistance than the control mixture, primarily as a consequence of higher OBC (ε6 was up to 26% higher).
- The low-temperature cracking resistance of asphalt mixtures decreased with increasing RCA content. The failure temperatures of mixtures with RCA were up to 4.3 °C higher in comparison to the control mixture. Based on these findings, an RCA content of 45% is viewed as the upper limit of applicability regarding low-temperature properties.
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Test | Standard | Unit | RCA | NA | ||
---|---|---|---|---|---|---|
Fine | Coarse | Fine | Coarse | |||
Apparent specific gravity | EN 1097-6 | (kg/m3) | 2645 | 2667 | 2717 | 2743 |
Bulk specific gravity SSD | (kg/m3) | 2512 | 2532 | 2650 | 2731 | |
Bulk specific gravity | (kg/m3) | 2430 | 2450 | 2580 | 2724 | |
Water absorption | (%) | 3.4 | 3.2 | 0.4 | 0.2 | |
Los Angeles abrasion | EN 1097-2 | (%) | - | 31.5 | - | 26.1 |
Mix | E | F-15 | F-30 | F-45 | C-15 | C-30 | C-45 | FC-15 | FC-30 | FC-45 |
---|---|---|---|---|---|---|---|---|---|---|
RCA (%) | 0 | 6.2 | 12.3 | 18.5 | 8.9 | 17.7 | 26.6 | 15 | 30 | 45 |
Mixture Type | Optimum Bitumen Content | Air Voids | Voids in Mineral Aggregate | Voids Filled with Bitumen | Effective Bitumen Content |
---|---|---|---|---|---|
OBC | AV | VMA | VFB | (%) | |
(%) | (%) | (%) | (%) | ||
E | 3.4 | 5.2 | 13.5 | 61.0 | 3.26 |
F-15 | 3.5 | 4.9 | 13.4 | 63.2 | 3.27 |
F-30 | 3.5 | 4.6 | 13.0 | 64.9 | 3.18 |
F-45 | 3.6 | 5.4 | 14.0 | 61.1 | 3.18 |
C-15 | 3.4 | 5.0 | 13.2 | 61.9 | 3.13 |
C-30 | 3.5 | 5.6 | 14.0 | 59.6 | 3.10 |
C-45 | 3.5 | 5.4 | 13.8 | 60.6 | 2.97 |
FC-15 | 3.6 | 5.3 | 13.9 | 62.1 | 3.24 |
FC-30 | 3.9 | 5.4 | 14.7 | 63.0 | 3.32 |
FC-45 | 4.4 | 4.5 | 15.0 | 69.6 | 3.60 |
Specification [36] | 3–6 | N/A | 55–74 |
Mixture | E | F-15 | F-30 | F-45 | C-15 | C-30 | C-45 | FC-15 | FC-30 | FC-45 |
---|---|---|---|---|---|---|---|---|---|---|
|E*| (MPa) | 6731 | 6343 | 6980 | 5803 | 5913 | 5734 | 5633 | 5688 | 6027 | 6291 |
Mix | E | F-15 | F-30 | F-45 | C-15 | C-30 | C-45 | FC-15 | FC-30 | FC-45 |
---|---|---|---|---|---|---|---|---|---|---|
A1 | −4.96 | −7.28 | −7.85 | −5.32 | −6.06 | −6.41 | −6.60 | −6.97 | −5.66 | −6.60 |
A0 | 37.74 | 49.89 | 53.61 | 39.35 | 43.25 | 45.73 | 46.32 | 48.83 | 41.84 | 47.59 |
R2 | 0.883 | 0.703 | 0.916 | 0.883 | 0.839 | 0.902 | 0.949 | 0.911 | 0.859 | 0.858 |
ε6 (μm/m) (Nf/50 = 106) | 124.0 | 141.7 | 158.9 | 121.3 | 129.0 | 145.8 | 137.4 | 151.8 | 141.4 | 167.2 |
Parameter | E | F-15 | F-30 | F-45 | C-15 | C-30 | C-45 | FC-15 | FC-30 | FC-45 |
---|---|---|---|---|---|---|---|---|---|---|
σmax (MPa) | 4.06 | 2.48 | 2.38 | 2.47 | 0.90 −21.5 | 3.26 | 2.07 | 3.00 | 2.94 | 3.40 |
Tcrack (°C) | − 23.7 | −22.2 | −20.0 | −20.8 | −21.7 | −19.4 | −23.3 | −20.8 | −19.7 |
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Radević, A.; Isailović, I.; Wistuba, M.P.; Zakić, D.; Orešković, M.; Mladenović, G. The Impact of Recycled Concrete Aggregate on the Stiffness, Fatigue, and Low-Temperature Performance of Asphalt Mixtures for Road Construction. Sustainability 2020, 12, 3949. https://0-doi-org.brum.beds.ac.uk/10.3390/su12103949
Radević A, Isailović I, Wistuba MP, Zakić D, Orešković M, Mladenović G. The Impact of Recycled Concrete Aggregate on the Stiffness, Fatigue, and Low-Temperature Performance of Asphalt Mixtures for Road Construction. Sustainability. 2020; 12(10):3949. https://0-doi-org.brum.beds.ac.uk/10.3390/su12103949
Chicago/Turabian StyleRadević, Aleksandar, Ivan Isailović, Michael P. Wistuba, Dimitrije Zakić, Marko Orešković, and Goran Mladenović. 2020. "The Impact of Recycled Concrete Aggregate on the Stiffness, Fatigue, and Low-Temperature Performance of Asphalt Mixtures for Road Construction" Sustainability 12, no. 10: 3949. https://0-doi-org.brum.beds.ac.uk/10.3390/su12103949