Reducing Compaction Temperature of Asphalt Mixtures by GNP Modification and Aggregate Packing Optimization
Compaction of hot mix asphalt (HMA) requires high temperatures in the range of 125 to 145 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></se...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-09-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/15/17/6060 |
| _version_ | 1797494481893720064 |
|---|---|
| author | Tianhao Yan Mugurel Turos Jia-Liang Le Mihai Marasteanu |
| author_facet | Tianhao Yan Mugurel Turos Jia-Liang Le Mihai Marasteanu |
| author_sort | Tianhao Yan |
| collection | DOAJ |
| description | Compaction of hot mix asphalt (HMA) requires high temperatures in the range of 125 to 145 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>C to ensure the fluidity of asphalt binder and, therefore, the workability of asphalt mixtures. The high temperatures are associated with high energy consumption, and higher NOx emissions, and can also accelerate the aging of asphalt binders. In previous research, the authors have developed two approaches for improving the compactability of asphalt mixtures: (1) addition of Graphite Nanoplatelets (GNPs), and (2) optimizing aggregate packing. This research explores the effects of these two approaches, and the combination of them, on reducing compaction temperatures while the production temperature is kept at the traditional levels. A reduction in compaction temperatures is desired for prolonging the paving window, extending the hauling distance, reducing the energy consumption for reheating, and for reducing the number of repairs and their negative environmental and safety effects, by improving the durability of the mixtures. A Superpave asphalt mixture was chosen as the control mixture. Three modified mixtures were designed, respectively, by (1) adding 6% GNP by the weight of binder, (2) optimizing aggregate packing, and (3) combining the two previous approaches. Gyratory compaction tests were performed on the four mixtures at two compaction temperatures: 135 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>C (the compaction temperature of the control mixture) and 95 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>C. A method was proposed based on the gyratory compaction to estimate the compaction temperature of the mixtures. The results show that all the three methods increase the compactability of mixtures and thus significantly reduce the compaction temperatures. Method 3 (combining GNP modification and aggregate packing optimization) has the most significant effect, followed by method 1 (GNP modification), and method 2 (aggregate packing optimization). |
| first_indexed | 2024-03-10T01:34:55Z |
| format | Article |
| id | doaj.art-d2d1e96dc61145c0b61ca85cf3512a89 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T01:34:55Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-d2d1e96dc61145c0b61ca85cf3512a892023-11-23T13:34:59ZengMDPI AGMaterials1996-19442022-09-011517606010.3390/ma15176060Reducing Compaction Temperature of Asphalt Mixtures by GNP Modification and Aggregate Packing OptimizationTianhao Yan0Mugurel Turos1Jia-Liang Le2Mihai Marasteanu3Department of Civil, Environmental and Geo- Engineering, University of Minnesota, Twin Cities, Minneapolis, MN 55455, USADepartment of Civil, Environmental and Geo- Engineering, University of Minnesota, Twin Cities, Minneapolis, MN 55455, USADepartment of Civil, Environmental and Geo- Engineering, University of Minnesota, Twin Cities, Minneapolis, MN 55455, USADepartment of Civil, Environmental and Geo- Engineering, University of Minnesota, Twin Cities, Minneapolis, MN 55455, USACompaction of hot mix asphalt (HMA) requires high temperatures in the range of 125 to 145 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>C to ensure the fluidity of asphalt binder and, therefore, the workability of asphalt mixtures. The high temperatures are associated with high energy consumption, and higher NOx emissions, and can also accelerate the aging of asphalt binders. In previous research, the authors have developed two approaches for improving the compactability of asphalt mixtures: (1) addition of Graphite Nanoplatelets (GNPs), and (2) optimizing aggregate packing. This research explores the effects of these two approaches, and the combination of them, on reducing compaction temperatures while the production temperature is kept at the traditional levels. A reduction in compaction temperatures is desired for prolonging the paving window, extending the hauling distance, reducing the energy consumption for reheating, and for reducing the number of repairs and their negative environmental and safety effects, by improving the durability of the mixtures. A Superpave asphalt mixture was chosen as the control mixture. Three modified mixtures were designed, respectively, by (1) adding 6% GNP by the weight of binder, (2) optimizing aggregate packing, and (3) combining the two previous approaches. Gyratory compaction tests were performed on the four mixtures at two compaction temperatures: 135 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>C (the compaction temperature of the control mixture) and 95 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>C. A method was proposed based on the gyratory compaction to estimate the compaction temperature of the mixtures. The results show that all the three methods increase the compactability of mixtures and thus significantly reduce the compaction temperatures. Method 3 (combining GNP modification and aggregate packing optimization) has the most significant effect, followed by method 1 (GNP modification), and method 2 (aggregate packing optimization).https://www.mdpi.com/1996-1944/15/17/6060temperature reductioncompactionasphalt mixtureGraphite Nanoplatelets (GNP)aggregate packing |
| spellingShingle | Tianhao Yan Mugurel Turos Jia-Liang Le Mihai Marasteanu Reducing Compaction Temperature of Asphalt Mixtures by GNP Modification and Aggregate Packing Optimization Materials temperature reduction compaction asphalt mixture Graphite Nanoplatelets (GNP) aggregate packing |
| title | Reducing Compaction Temperature of Asphalt Mixtures by GNP Modification and Aggregate Packing Optimization |
| title_full | Reducing Compaction Temperature of Asphalt Mixtures by GNP Modification and Aggregate Packing Optimization |
| title_fullStr | Reducing Compaction Temperature of Asphalt Mixtures by GNP Modification and Aggregate Packing Optimization |
| title_full_unstemmed | Reducing Compaction Temperature of Asphalt Mixtures by GNP Modification and Aggregate Packing Optimization |
| title_short | Reducing Compaction Temperature of Asphalt Mixtures by GNP Modification and Aggregate Packing Optimization |
| title_sort | reducing compaction temperature of asphalt mixtures by gnp modification and aggregate packing optimization |
| topic | temperature reduction compaction asphalt mixture Graphite Nanoplatelets (GNP) aggregate packing |
| url | https://www.mdpi.com/1996-1944/15/17/6060 |
| work_keys_str_mv | AT tianhaoyan reducingcompactiontemperatureofasphaltmixturesbygnpmodificationandaggregatepackingoptimization AT mugurelturos reducingcompactiontemperatureofasphaltmixturesbygnpmodificationandaggregatepackingoptimization AT jialiangle reducingcompactiontemperatureofasphaltmixturesbygnpmodificationandaggregatepackingoptimization AT mihaimarasteanu reducingcompactiontemperatureofasphaltmixturesbygnpmodificationandaggregatepackingoptimization |