Short-Term Aging Effect on Properties of Sustainable Pavement Asphalts Modified by Waste Rubber and Diatomite
<p>High speed shear homogenizer.</p> "> Figure 2
<p>The penetration versus aging time of diatomite modified asphalt (DA), crumb rubber modified asphalt (RA), and diatomite and crumb rubber compound modified asphalt (DRA).</p> "> Figure 3
<p>The softening point versus aging time of DA, RA, and DRA.</p> "> Figure 4
<p>The ductility versus aging time of DA, RA, and DRA.</p> "> Figure 5
<p>The viscosity versus aging time of DA, RA, and DRA.</p> "> Figure 6
<p>The viscosity versus temperature of DA, RA, and DRA (<b>a</b>) before TFOT and (<b>b</b>) after TFOT.</p> "> Figure 7
<p>The elastic recovery versus aging time of DA, RA, and DRA</p> "> Figure 8
<p>The creep stiffness and <span class="html-italic">m</span>-value versus aging time of DA, RA, and DRA; (<b>a</b>) creep stiffness, (<b>b</b>) <span class="html-italic">m</span>-value.</p> "> Figure 9
<p>The rutting parameters versus aging time of DA, RA, and DRA.</p> ">
Abstract
:1. Introduction
2. Materials and Methods
2.1. Raw Materials
2.2. Preparation of Modified Asphalt Binder
2.3. Characterization Method
3. Results and Discussion
3.1. Penetration
3.2. Softening Point
3.3. Ductility
3.4. Viscosity
3.5. Elastic Recovery
3.6. Low Temperature Creep
3.7. Rutting Susceptibility
4. Conclusions
- The softening point, viscosity, elastic recovery, creep stiffness, and G*/sinδ of DA, RA, and DRA all linearly increased with increasing time, while the penetration and ductility linearly decreased with increasing time. This could be ascribed to the fact that the aging time is not long enough to make the properties of asphalt become stable.
- The anti-aging performance of three types of modified asphalt was evaluated by PRP, ∆T, and VAI. According to the results of PRP, DRA exhibits the highest PRP compared with DA and RA, which indicates that DRA has a better performance of aging resistance than DA and RA. Meanwhile, the lower ∆T and VAI of DRA illustrates that the anti-aging of DRA is considered to be best.
- High temperature properties of asphalt under short-term aging are affected more seriously by the addition of crumb rubber according to the results of penetration, softening point, viscosity, elastic recovery, and G*/sinδ. Low temperature properties of asphalt are affected more seriously by the addition of diatomite according to the results of creep stiffness and m-value. The diatomite and crumb rubber modified asphalt could combine the advantages of diatomite and crumb rubber and achieve better modification effects.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Property | Value | Technical Criterion (%) |
---|---|---|
Penetration (25 °C, 0.1 mm) | 84 | 80~100 |
Penetration index, PI | −1.01 | −1.5~+1.0 |
Softening point (The Ring and Ball Test, TR&B) (°C) | 44 | ≥42 |
Ductility (15 °C, cm) | 150 | ≥100 |
Specific gravity (15 °C, g/cm3) | 1.05 | - |
After TFOT | ||
Mass loss (%) | −0.3 | ≤±0.8 |
Penetration ratio (25 °C, %) | 64 | ≥57 |
Age ductility (10 °C, cm) | 14 | ≥8 |
Property | Sauer A Hardness (°) | Apparent Density (g/cm3) | Moisture Content (%) |
---|---|---|---|
Value | 60 | 1.321 | 0.5 |
Particle Size (μm) | 550 | 380 | 270 | 250 | 212 | 180 | 160 | 150 | 120 |
---|---|---|---|---|---|---|---|---|---|
Percentage passing (%) | 69.8 | 33.5 | 20.8 | 13.8 | 5.3 | 5.1 | 3.9 | 3.0 | 0.0 |
Property | Color | PH | Specific Gravity (g/cm3) | Bulk Density (g/cm3) | Loss on Ignition (%) | Content of SiO2 (%) | Content of Fe3O2 (%) |
---|---|---|---|---|---|---|---|
Value | Orange | 8~10 | 2.152 | 0.37 | ≤0.25 | ≥87.1 | ≤1.1 |
Particle Size (μm) | <5 | 10~5 | 20~10 | 40~20 | >40 |
---|---|---|---|---|---|
Percentage (%) | 19.3 | 28.0 | 20.7 | 21.0 | 11.0 |
Type | P1 (0.1 mm) | P2 (0.1 mm) | PRP (%) |
---|---|---|---|
DA | 72.36 | 45.54 | 62.93 |
RA | 53.23 | 38.17 | 71.71 |
DRA | 53.75 | 45.78 | 85.17 |
Type | T1 (°C) | T2 (°C) | ΔT (°C) |
---|---|---|---|
DA | 46.75 | 51.59 | 4.84 |
RA | 57.21 | 62.61 | 5.40 |
DRA | 56.65 | 59.51 | 2.86 |
Type | η1 (Pa·s) | η2 (Pa·s) | VAI |
---|---|---|---|
DA | 0.504 | 0.721 | 0.0242 |
RA | 4.078 | 5.423 | 0.0146 |
DRA | 3.106 | 3.805 | 0.0108 |
Type | Mixing Temperature (°C) | Compaction Temperature (°C) | ||
---|---|---|---|---|
Unaged | Aged | Unaged | Aged | |
DA | 174.6~183.8 | 172.8~180.2 | 155.4~163.8 | 157.6~164.3 |
RA | 257.2~266.5 | 248.4~256.4 | 237.9~246.4 | 231.7~239.0 |
DRA | 222.2~229.7 | 220.4~227.2 | 206.6~213.5 | 206.3~212.5 |
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Liu, H.; Fu, L.; Jiao, Y.; Tao, J.; Wang, X. Short-Term Aging Effect on Properties of Sustainable Pavement Asphalts Modified by Waste Rubber and Diatomite. Sustainability 2017, 9, 996. https://doi.org/10.3390/su9060996
Liu H, Fu L, Jiao Y, Tao J, Wang X. Short-Term Aging Effect on Properties of Sustainable Pavement Asphalts Modified by Waste Rubber and Diatomite. Sustainability. 2017; 9(6):996. https://doi.org/10.3390/su9060996
Chicago/Turabian StyleLiu, Hanbing, Liuxu Fu, Yubo Jiao, Jinglin Tao, and Xianqiang Wang. 2017. "Short-Term Aging Effect on Properties of Sustainable Pavement Asphalts Modified by Waste Rubber and Diatomite" Sustainability 9, no. 6: 996. https://doi.org/10.3390/su9060996