Influence of Emulsified Asphalt on the Mechanical Property and Microstructure of Cement-Stabilized Gravel under Freezing and Thawing Cycle Conditions
Abstract
:1. Introduction
2. Materials and Methods
2.1. Raw Materials
2.2. Specimen Preparation and Curing
2.3. Experimental Method
2.3.1. Freeze–Thaw Cycling Test
2.3.2. Unconfined Compressive Strength Testing
2.3.3. Dynamic Compressive Resilient Modulus Testing
2.3.4. Pore Structure Testing and Microstructure Analysis
3. Results and Discussion
3.1. Unconfined Compressive Strength Testing
3.2. Dynamic Compressive Resilient Modulus Testing
3.3. Pore Structure Testing and Microstructure Analysis
3.3.1. CSG Pore Structure and Microstructure
3.3.2. EA-Modified CSG Pore Structure and Microstructure
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Items | Test Values | Technical Requirements | |
---|---|---|---|
Stability (boiling method) | Qualified | — | |
Initial time (min) | 165 | ≥90 | |
Final setting time (min) | 203 | ≤600 | |
3 days curing | Compressive strength (MPa) | 26.4 | ≥17.0 |
Flexural strength (MPa) | 5.87 | ≥3.5 | |
28 days curing | Compressive strength (MPa) | 49.6 | ≥42.5 |
Flexural strength (MPa) | 8.07 | ≥6.5 |
Properties | Test Values | Technical Requirements |
---|---|---|
Crushing value | 13.73 | <30% |
Abrasion value | 8.75 | / |
Liquid limit (%) | 24 | <28% |
Plasticity index | 8 | 6–9 |
Clay content (%) | 1.76 | / |
Flat and elongated particles content (%) | 5.85 | <20% |
Property | Index Requirement | Test Result |
---|---|---|
Remaining amount on 1.18 mm sieve (by mass)/% | <0.1 | 0 |
Residue content (by mass)/% | 58–63 | 61 |
Penetration (25 °C, 100 g)/(0.1 mm) | 60.0–120.0 | 76.6 |
Solubility in trichloroethylene (by mass)/% | >97 | 99.7 |
Softening point/°C | – | 45.8 |
Ductility (15 °C)/cm | ≥50.0 | 69.7 |
Emulsion breaking speed | Slow crack | Slow crack |
Sample Number | Dosage of Cement (wt %) | Dosage of Emulsified Asphalt (wt %) |
---|---|---|
A0 | 4.0 | 0 |
A1 | 4.0 | 2.5 |
B0 | 5.0 | 0 |
B1 | 5.0 | 2.5 |
Freeze-Thaw Cycles (Times) | 4.0 wt % Cement Dosage | 5.0 wt % Cement Dosage | ||
---|---|---|---|---|
A0 | A1 | B0 | B1 | |
0 | 4.298 | 3.871 | 4.012 | 3.999 |
5 | 4.715 | 4.210 | 4.528 | 3.641 |
10 | 4.485 | 4.399 | 4.234 | 4.200 |
15 | 5.123 | 5.620 | 5.017 | 4.485 |
Freeze-Thaw Cycles (Times) | 4.0 wt % Cement Dosage | 5.0 wt % Cement Dosage | ||
---|---|---|---|---|
A0 | A1 | B0 | B1 | |
0 | 7.910 | 6.800 | 6.002 | 5.377 |
5 | 6.798 | 7.038 | 7.643 | 6.090 |
10 | 8.100 | 7.927 | 7.225 | 6.358 |
15 | 9.203 | 8.211 | 7.866 | 6.732 |
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Wang, Y.; Tan, Y.; Guo, M.; Wang, X. Influence of Emulsified Asphalt on the Mechanical Property and Microstructure of Cement-Stabilized Gravel under Freezing and Thawing Cycle Conditions. Materials 2017, 10, 504. https://doi.org/10.3390/ma10050504
Wang Y, Tan Y, Guo M, Wang X. Influence of Emulsified Asphalt on the Mechanical Property and Microstructure of Cement-Stabilized Gravel under Freezing and Thawing Cycle Conditions. Materials. 2017; 10(5):504. https://doi.org/10.3390/ma10050504
Chicago/Turabian StyleWang, Yiqi, Yiqiu Tan, Meng Guo, and Xinglong Wang. 2017. "Influence of Emulsified Asphalt on the Mechanical Property and Microstructure of Cement-Stabilized Gravel under Freezing and Thawing Cycle Conditions" Materials 10, no. 5: 504. https://doi.org/10.3390/ma10050504