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摘要: 为了分析旋转薄膜烘箱试验(RTFOT)评价沥青结合料整体老化性能的合理性, 以及长期老化与短期老化试验结果之间的关系, 采用组分试验、常规指标以及Superpave指标对沥青经短期老化试验(RTFOT)和长期老化试验(PAV)的样品进行了试验研究。结果表明长期老化后沥青样品的组分变化规律与短期老化不一致, 物理指标增减幅度不同, 但如按指标评价沥青的抗老化特性, 两种不同老化方式的沥青优劣排序基本一致, 这说明虽然短期老化不能全面反映沥青的抗老化特性, 但在目前情况下作为沥青的优选方法是可行的。
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关键词:
- 道路工程 /
- 沥青 /
- 老化试验方法 /
- 弯梁流变仪(BBR) /
- 动态剪切流变仪(DSR)
Abstract: In order to analyze the reasonability of rolling thin film oven test(RTFOT) on asphalt aging and the relationship between short term aging and long term aging of asphalt, tie constituent analysis, normal tests and Superpave performance-based tests were conducted on several asphalt specimens after RTFOT and pressure aging vessel(PAV). Test results indicate that the change rules of asphalt constituents in the two terms are different, while mechanical parameters values change with different magnitude, but if these asphalts are ranked according to their aging properties, the order is basically unchanged. The results show that the short term aging test is a good alternative to evaluate and select right asphalt at present time, but it can not reflect the aging properties of asphalt thoroughly.-
Key words:
- highway engineering /
- asphalt /
- aging test /
- bending beam rheometer(BBR) /
- dynamic shear rheometer(DSR)
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表 1 组分变化试验结果
Table 1. Constituent changing result after different aging test
样名 沥青质含量/% 饱和分含量/% 芳香分含量/% 胶质含量/% 镇海 原样 9.6 12.5 42.1 28.2 短期 13.3 13.3 36.3 33.2 长期 24.2 13.0 27.4 33.5 兰炼 原样 5.4 22.7 31.3 30.9 短期 9.4 23.3 31.5 26.0 长期 11.3 25.5 23.7 29.8 克拉 原样 1.0 24.4 27.4 33.8 短期 1.5 22.5 28.3 36.3 长期 4.2 24.3 19.5 29.7 盘锦 原样 5.5 19.4 33.8 32.5 短期 7.8 22.2 32.2 31.1 长期 9.8 23.3 24.3 33.9 表 2 常规试验结果
Table 2. Normal test results
试验项目 镇海(AH-50) 克拉(AH-70) 兰炼(AH-90) 盘锦(AH-110) 原样 25 ℃针入度/(0.1 mm) 58 71 82 113 针入度指数 -1.951 -0.580 -1.332 -1.479 感温系数 0.054 5 0.043 70 0.049 2 0.050 4 延度(15℃)/cm > 100 > 100 55.4 > 100 软化点 49.5 50.5 48.7 41.4 旋转薄膜加热试验(163 ℃, 85 min) 针入度/(0.1 mm) 37 52 57 75 针入度指数 -1.035 -0.251 -0.294 -0.897 感温系数 0.047 0 0.041 5 0.041 8 0.046 0 针入度比/% 63.8 73.2 69.5 66.4 软化点/℃ 53.0 55.1 52.0 45.8 软化点差(与基质相比)/℃ 3.5 4.6 3.3 4.5 延度(15 ℃)/cm 23.3 84.0 14.2 > 100 RTFOT残留物经PAV老化后 针入度/(0.1 mm) 19 36 29 36 针入度比/% 32.8 50.7 35.4 31.9 针入度指数 3.253 1.439 1.975 -0.199 感温系数 0.025 3 0.032 5 0.030 1 0.041 2 软化点/℃ 68.8 61.6 66.7 55.3 软化点差(与基质相比)/℃ 19.3 11.1 18.0 13.9 延度(15 ℃)/cm 4.8 10.6 3.8 25.2 表 3 不同老化状态的DSR试验结果
Table 3. DSR test result after aging
温度/℃ G*sin-1δ/MPa 盘锦 兰炼 镇海 原样 52 6.89 5.29 6.66 58 2.98 2.15 2.06 64 1.36 1.03 0.91 70 0.65 0.52 0.51 76 0.19 0.28 0.21 82 0.10 0.16 0.12 短期 52 10.36 13.73 12.48 58 4.91 5.96 5.30 64 2.07 2.67 2.12 70 1.05 1.27 0.91 76 0.50 0.63 0.42 82 0.29 0.34 0.21 长期 52 19.92 59.31 13.14 58 6.51 28.26 5.12 64 2.58 12.25 2.04 70 1.11 6.24 0.88 76 0.52 2.99 0.41 82 0.23 1.44 0.21 表 4 不同老化状态的BBR试验结果
Table 4. BBR test results after aging
状态 劲度S/MPa m值 兰炼 原样 74.5 0.447 短期老化 81.9 0.402 长期老化 98.9 0.369 盘锦 原样 101.0 0.503 短期老化 98.0 0.493 长期老化 151.0 0.396 镇海 原样 173.0 0.374 短期老化 198.0 0.343 长期老化 228.0 0.297 -
[1] 张登良. 沥青与沥青混合料[M]. 北京: 人民交通出版社, 2001. [2] Roque. Thermal rippling of asphalt concrete pavement[J]. Proceedings Association of Asphalt Paving Technologists, 1988, 57(1): 464-466. [3] Zupaniek M. Comparison of the thin film oven test and the rolling thin film oven test[J]. Proceedings Association of Asphalt Paving Technologists, 1994, 63(1): 346-351. [4] Jacobs M M J, Hopman P C, Molenaar A A A. Application of fracture mechanics in principles to analyze cracking in asphalt concrete[J]. Proceedings Association of Asphalt Paving Technologists, 1996, 65(1): 1-32. [5] Reese R. Properties of aged asphalt binder related to asphalt concrete fatigue life[J]. Proceedings Association of Asphalt Paving Technologists, 1997, 66(1): 604-623. [6] 张争奇. SBS改性沥青几个异常现象的研究和探讨[J]. 西安公路交通大学学报, 2001, 21(4): 6-11. doi: 10.3321/j.issn:1671-8879.2001.04.002ZHANG Zheng-qi. Study of several abnormal phenomena in the tests of styrene-butadiene-styrene(SBS)polymer modified asphalt[J]. Journal of Xi'an Highway University, 2001, 21 (4): 6-11. (in Chinese) doi: 10.3321/j.issn:1671-8879.2001.04.002 [7] 田小革, 郑建龙. 老化对沥青结合料粘弹性的影响[J]. 交通运输工程学报, 2004, 4(1): 3-6. http://transport.chd.edu.cn/article/id/200401002TIAN Xiao-ge, ZHENG Jian-long. Effect of aging on viscoealastic performance of asphalt binder[J]. Journal of Traffic and Transportation Engineering, 2004, 4(1): 3-6. (in Chinese) http://transport.chd.edu.cn/article/id/200401002 [8] 刘朝晖. 宽域沥青路用性能试验[J]. 交通运输工程学报, 2003, 3(1): 47-51. http://transport.chd.edu.cn/article/id/200301011LIU Zhao-hui. Performance of multiphalt in experiments[J]. Journal of Traffic and Transportation Engineering, 2003, 3 (1): 47-51. (in Chinese) http://transport.chd.edu.cn/article/id/200301011 [9] SHRP-A-400, Low Temperature Cracking[S]. [10] 袁迎捷, 张争奇, 胡长顺. Superpave沥青规范对改性沥青适用性[J]. 长安大学学报(自然科学版), 2004, 24(1): 9-11. https://www.cnki.com.cn/Article/CJFDTOTAL-XAGL200401003.htmYUAN Ying-jie, ZHANG Zheng-qi, HU Chang-shun. Applicability of Superpave specification to modified asphalt[J]. Journal of Chang'an University(Natural Science Edition), 2004, 24(1): 9-11. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-XAGL200401003.htm