Effect of Reclaimed Asphalt Pavement Heating Temperature on the Compactability of Recycled Hot Mix Asphalt
The compactability of an asphalt mixture is related to the heating temperature of the materials, but the heating temperature of reclaimed asphalt pavement (RAP) is limited by the production process of hot-in-plant recycled mixtures. To choose a reasonable heating temperature for RAP according to the...
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doaj-a399e4b915234c358917406964dcc4b22020-11-25T03:39:12ZengMDPI AGMaterials1996-19442020-08-01133621362110.3390/ma13163621Effect of Reclaimed Asphalt Pavement Heating Temperature on the Compactability of Recycled Hot Mix AsphaltXiang Ma0Zhen Leng1Lili Wang2Peisheng Zhou3College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, ChinaDepartment of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong KongSuzhou Sanchuang Pavement Engineering Co., LTD, Suzhou 215128, ChinaCollege of Civil Engineering, Nanjing Forestry University, Nanjing 210037, ChinaThe compactability of an asphalt mixture is related to the heating temperature of the materials, but the heating temperature of reclaimed asphalt pavement (RAP) is limited by the production process of hot-in-plant recycled mixtures. To choose a reasonable heating temperature for RAP according to the compactability, the compaction energy ratio (CER) obtained from the Superpave gyratory compactor compaction curve was developed. The CERs of fourteen kinds of asphalt mixtures made with different RAPs were compared, all of which were different in type, content, and heating temperature. The results indicated that CER is an effective energy index to evaluate the workability of a bituminous mixture, and it considers both the accumulated energy after each gyration and the number of gyrations. It was also found that increasing the heating temperature of the RAP cannot always improve the workability of the recycled mixture, because the higher heating temperature caused more hard-aged bitumen to be blended with soft virgin bitumen during the mixing process. At the same RAP heating temperature, increasing the RAP content made it more difficult to compact the mixture, especially for RAPs with styrene–butadiene–styrene (SBS) modified bitumen, and the recycled mixtures with SBS-modified bitumen were more difficult to compact than those with nonmodified bitumen.https://www.mdpi.com/1996-1944/13/16/3621RAPrecycled hot mix asphaltcompactabilitygyratory compactionCER |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xiang Ma Zhen Leng Lili Wang Peisheng Zhou |
spellingShingle |
Xiang Ma Zhen Leng Lili Wang Peisheng Zhou Effect of Reclaimed Asphalt Pavement Heating Temperature on the Compactability of Recycled Hot Mix Asphalt Materials RAP recycled hot mix asphalt compactability gyratory compaction CER |
author_facet |
Xiang Ma Zhen Leng Lili Wang Peisheng Zhou |
author_sort |
Xiang Ma |
title |
Effect of Reclaimed Asphalt Pavement Heating Temperature on the Compactability of Recycled Hot Mix Asphalt |
title_short |
Effect of Reclaimed Asphalt Pavement Heating Temperature on the Compactability of Recycled Hot Mix Asphalt |
title_full |
Effect of Reclaimed Asphalt Pavement Heating Temperature on the Compactability of Recycled Hot Mix Asphalt |
title_fullStr |
Effect of Reclaimed Asphalt Pavement Heating Temperature on the Compactability of Recycled Hot Mix Asphalt |
title_full_unstemmed |
Effect of Reclaimed Asphalt Pavement Heating Temperature on the Compactability of Recycled Hot Mix Asphalt |
title_sort |
effect of reclaimed asphalt pavement heating temperature on the compactability of recycled hot mix asphalt |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2020-08-01 |
description |
The compactability of an asphalt mixture is related to the heating temperature of the materials, but the heating temperature of reclaimed asphalt pavement (RAP) is limited by the production process of hot-in-plant recycled mixtures. To choose a reasonable heating temperature for RAP according to the compactability, the compaction energy ratio (CER) obtained from the Superpave gyratory compactor compaction curve was developed. The CERs of fourteen kinds of asphalt mixtures made with different RAPs were compared, all of which were different in type, content, and heating temperature. The results indicated that CER is an effective energy index to evaluate the workability of a bituminous mixture, and it considers both the accumulated energy after each gyration and the number of gyrations. It was also found that increasing the heating temperature of the RAP cannot always improve the workability of the recycled mixture, because the higher heating temperature caused more hard-aged bitumen to be blended with soft virgin bitumen during the mixing process. At the same RAP heating temperature, increasing the RAP content made it more difficult to compact the mixture, especially for RAPs with styrene–butadiene–styrene (SBS) modified bitumen, and the recycled mixtures with SBS-modified bitumen were more difficult to compact than those with nonmodified bitumen. |
topic |
RAP recycled hot mix asphalt compactability gyratory compaction CER |
url |
https://www.mdpi.com/1996-1944/13/16/3621 |
work_keys_str_mv |
AT xiangma effectofreclaimedasphaltpavementheatingtemperatureonthecompactabilityofrecycledhotmixasphalt AT zhenleng effectofreclaimedasphaltpavementheatingtemperatureonthecompactabilityofrecycledhotmixasphalt AT liliwang effectofreclaimedasphaltpavementheatingtemperatureonthecompactabilityofrecycledhotmixasphalt AT peishengzhou effectofreclaimedasphaltpavementheatingtemperatureonthecompactabilityofrecycledhotmixasphalt |
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