Binder Oxidative Aging in Texas Pavements: Hardening Rates, Hardening Susceptibilities, and Impact of Pavement Depth
Aging of binders in pavements is much less understood than laboratory aging of neat binders because of a number of complications. Complications include suitable extraction and recovery methods; uncontrolled variables and unknowns such as mixture characteristics (e.g., air voids), maintenance treatme...
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Published in | Transportation research record Vol. 1962; no. 1962; pp. 12 - 20 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.01.2006
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Abstract | Aging of binders in pavements is much less understood than laboratory aging of neat binders because of a number of complications. Complications include suitable extraction and recovery methods; uncontrolled variables and unknowns such as mixture characteristics (e.g., air voids), maintenance treatments, traffic, and climate; sustaining of a research effort to study a given pavement during an appropriate time frame (in excess of one decade); and cost. An ongoing research effort sponsored by the Texas Department of Transportation studied binder oxidative hardening at 15 pavements across Texas. Results indicate that typically unmodified binders in pavements oxidize and harden to a degree that exceeds generally accepted pavement aging assumptions. In addition, this hardening may extend much deeper into the pavement than has been previously assumed or documented. Data suggest that pavements can oxidize at surprisingly uniform rates with depth once early oxidation occurs and that these rates continue for an extended time. As a rough measure, 1 month environmental room aging of 1-mm neat binder films at 60 deg C was equivalent to about 15 months in Texas Highway 21 after the early higher hardening rate period. |
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AbstractList | Aging of binders in pavements is much less understood than laboratory aging of neat binders because of a number of complications. Complications include suitable extraction and recovery methods; uncontrolled variables and unknowns such as mixture characteristics (e.g., air voids), maintenance treatments, traffic, and climate; sustaining of a research effort to study a given pavement during an appropriate time frame (in excess of one decade); and cost. An ongoing research effort sponsored by the Texas Department of Transportation studied binder oxidative hardening at 15 pavements across Texas. Results indicate that typically unmodified binders in pavements oxidize and harden to a degree that exceeds generally accepted pavement aging assumptions. In addition, this hardening may extend much deeper into the pavement than has been previously assumed or documented. Data suggest that pavements can oxidize at surprisingly uniform rates with depth once early oxidation occurs and that these rates continue for an extended time. As a rough measure, 1 month environmental room aging of 1-mm neat binder films at 60 deg C was equivalent to about 15 months in Texas Highway 21 after the early higher hardening rate period. |
Author | Bullin, Jerry Ferry, Ann Jung, Sung Al-Azri, Nasser Davison, Richard Lunsford, Kevin Glover, Charles |
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CitedBy_id | crossref_primary_10_1080_10916466_2015_1057592 crossref_primary_10_1080_14680629_2015_1108219 crossref_primary_10_1080_10916466_2012_665115 crossref_primary_10_1080_10916466_2014_941067 crossref_primary_10_1080_14680629_2006_9690058 crossref_primary_10_1016_j_conbuildmat_2014_05_091 crossref_primary_10_1080_10916466_2011_559506 crossref_primary_10_1016_j_fuel_2012_06_080 crossref_primary_10_1155_2018_3428961 crossref_primary_10_1016_j_fuel_2013_12_040 crossref_primary_10_1080_10298436_2014_943222 crossref_primary_10_1016_j_conbuildmat_2010_12_058 crossref_primary_10_1080_14680629_2009_9690238 crossref_primary_10_1111_jmi_12122 crossref_primary_10_1088_1757_899X_236_1_012015 crossref_primary_10_1016_j_cej_2015_05_074 crossref_primary_10_1016_j_conbuildmat_2015_10_125 crossref_primary_10_1016_j_fuel_2007_06_029 crossref_primary_10_1016_j_fuel_2006_11_024 |
Cites_doi | 10.1021/ie980450o 10.1081/LFT-100000765 10.1021/ie9906215 10.1080/08843759208916021 10.1081/LFT-120016946 10.1007/978-1-4757-9293-5_5 10.1080/08843759608947566 |
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Title | Binder Oxidative Aging in Texas Pavements: Hardening Rates, Hardening Susceptibilities, and Impact of Pavement Depth |
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