新旧沥青融合程度对热再生沥青混合料性能影响

摘要/Abstract

摘要： 沥青混合料热再生过程中新旧沥青融合程度对其混合料的性能影响显著,目前我国热再生沥青混合料进行配合比设计时并未考虑新旧沥青的融合问题。为探究新旧沥青融合程度对热再生沥青混合料工作性能及配合比设计的影响,在质量分数为20%、30%、40%、50%废旧沥青路面回收材料(RAP)掺量下,对常规拌和方式及模拟新旧沥青100%融合拌和方式制备的热再生沥青混合料的高温抗车辙性能、低温抗裂性能、水稳定性以及抗反射开裂性能展开系统地对比研究,在建立两种拌制方式下路用性能差异与RAP掺量之间关系的基础上,确定了需要考虑融合程度的界限RAP掺量。结果表明:随着RAP掺量增大,混合料的高温性能增强,低温性能、水稳定性以及抗反射开裂性能降低;与常规拌和方式相比,新旧沥青100%融合条件下拌制混合料的低温性能、水稳定性以及抗反射开裂性能更优,高温性能较差;两种混合料之间高温性能差异、低温性能差异以及水稳定性差异随RAP掺量的增加逐渐增大,抗反射开裂性能差异无显著变化;以性能差异平均增长率所对应的RAP掺量为界限掺量,提出当RAP掺量大于30%时,热再生混合料设计中应考虑新旧沥青融合程度的影响。

关键词: 热再生沥青混合料, 常规拌和, 新旧沥青100%融合, RAP掺量, 性能影响, 界限掺量

Abstract: The blending degree between aged and virgin asphalt has a significant influence on performance of asphalt mixture in hot recycling procedure. At present, the blending degree is not considered in the mix design of hot recycled asphalt mixture in China. In order to explore the influence of the blending degree on technical performance and composition design of hot recycled asphalt mixtures, the high temperature performance, low temperature performance, water stability and anti-reflection cracking performance of the mixture prepared by conventional mixing method and artificially simulated 100% blending with mass fraction of 20%, 30%, 40%, 50% recycled materials for waste asphalt pavement (RAP) were studied. On the basis of establishing the relationship between road performance difference and RAP content under two mixing methods, the boundary RAP content which needs to consider the blending degree was determined. The results show that with the increase of RAP content, the high temperature performance of the mixture is enhanced, while the low temperature performance, water stability and anti-reflection cracking performance are reduced. Compared with the conventional mixing, the low temperature performance, water stability and anti-reflection cracking performance of the mixture mixed with 100% blending between aged and virgin asphalt are better, but the high temperature performance is poor. The difference of high temperature performance, low temperature performance and water stability increases gradually with the increase of RAP content, while the difference of anti-reflection cracking performance do not change significantly. Taking the content corresponding to the average growth rate of performance difference as the boundary content, it is recommended that when the RAP content is more than 30%, the influence of the blending degree between aged and virgin asphalt should be considered in the design of hot recycled asphalt mixture.

Key words: hot recycled asphalt mixture, conventional mixing, 100% blending between aged and virgin asphalt, RAP content, performance influence, boundary content

中图分类号:

U414

郝培文, 李洪祥, 崔鹰翔, 徐金枝. 新旧沥青融合程度对热再生沥青混合料性能影响[J]. 硅酸盐通报, 2021, 40(11): 3837-3846.

HAO Peiwen, LI Hongxiang, CUI Yingxiang, XU Jinzhi. Influence of Blending Degree Between Aged and Virgin Asphalt on Performance of Hot Recycled Asphalt Mixture[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3837-3846.

参考文献

[1] ARAVIND K, DAS A. Pavement design with central plant hot-mix recycled asphalt mixes[J]. Construction and Building Materials, 2007, 21(5): 928-936.
[2] 薛彦卿,黄晓明.厂拌热再生沥青混合料力学性能试验研究[J].建筑材料学报,2011,14(4):507-511.
XUE Y Q, HUANG X M. Experimental research on mechanical property of asphalt mixture from central plant hot recycling[J]. Journal of Building Materials, 2011, 14(4): 507-511 (in Chinese).
[3] 何兆益,陈龙,陈先勇,等.厂拌热再生沥青混合料力学性能及应用研究[J].建筑材料学报,2016,19(5):871-875+914.
HE Z Y, CHEN L, CHEN X Y, et al. Mechanical properties and application research of hot recycled asphalt mixture from central mixing plant[J]. Journal of Building Materials, 2016, 19(5): 871-875+914 (in Chinese).
[4] 毕连居,赵博,蔡海泉,等.沥青路面热再生技术环境效益分析研究[J].重庆交通大学学报(自然科学版),2017,36(11):44-47.
BI L J, ZHAO B, CAI H Q, et al. Environmental benefits analysis on asphalt pavement hot recycling technologies[J]. Journal of Chongqing Jiaotong University (Natural Science), 2017, 36(11): 44-47 (in Chinese).
[5] ZHAO S, HUANG B S, SHU X, et al. Quantitative characterization of binder blending[J]. Transportation Research Record: Journal of the Transportation Research Board, 2015, 2506(1): 72-80.
[6] ZAUMANIS M, MALLICK R B, POULIKAKOS L, et al. Influence of six rejuvenators on the performance properties of reclaimed asphalt pavement (RAP) binder and 100% recycled asphalt mixtures[J]. Construction and Building Materials, 2014, 71: 538-550.
[7] OREŠKOVIĆ M, MENEGUSSO PIRES G, BRESSI S, et al. Quantitative assessment of the parameters linked to the blending between reclaimed asphalt binder and recycling agent: a literature review[J]. Construction and Building Materials, 2020, 234: 117323.
[8] LO PRESTI D, VASCONCELOS K, OREŠKOVI M, et al. On the degree of binder activity of reclaimed asphalt and degree of blending with recycling agents[J]. Road Materials and Pavement Design, 2020, 21(8): 2071-2090.
[9] HUANG B S, LI G Q, VUKOSAVLJEVIC D, et al. Laboratory investigation of mixing hot-mix asphalt with reclaimed asphalt pavement[J]. Transportation Research Record: Journal of the Transportation Research Board, 2005, 1929(1): 37-45.
[10] BOWERS B F, HUANG B S, SHU X, et al. Investigation of reclaimed asphalt pavement blending efficiency through GPC and FTIR[J]. Construction and Building Materials, 2014, 50: 517-523.
[11] 张德鹏,徐金枝,郝培文,等.基于GPC和FTIR的再生混合料新旧沥青融合程度研究[J].中外公路,2016,36(6):214-219.
ZHANG D P, XU J Z, HAO P W, et al. Study on the fusion degree of old and new asphalt in recycled mixture based on GPC and FTIR[J]. Journal of China & Foreign Highway, 2016, 36(6): 214-219 (in Chinese).
[12] JIANG Y X, GU X Y, ZHOU Z, et al. Laboratory observation and evaluation of asphalt blends of reclaimed asphalt pavement binder with virgin binder using SEM/EDS[J]. Transportation Research Record: Journal of the Transportation Research Board, 2018, 2672(28): 69-78.
[13] ABDALFATTAH I A, MOGAWER W S, STUART K. Quantification of the degree of blending in hot-mix asphalt (HMA) with reclaimed asphalt pavement (RAP) using energy dispersive X-ray spectroscopy (EDX) analysis[J]. Journal of Cleaner Production, 2021, 294: 126261.
[14] XU J Z, HAO P W, ZHANG D P, et al. Investigation of reclaimed asphalt pavement blending efficiency based on micro-mechanical properties of layered asphalt binders[J]. Construction and Building Materials, 2018, 163: 390-401.
[15] 中华人民共和国交通部.公路沥青路面施工技术规范:JTG F 40—2004[S].北京:人民交通出版社,2005.
Ministry of Transport of the People's Republic of China. Standard specification for construction and acceptance of highway asphalt pavement: JTG F 40—2004[S]. Beijing: People's Communications Press, 2005 (in Chinese).
[16] LI Z Z, CHEN S F, LIAO W D, et al. Lab simulation study on anti-cracking performance of asphalt concrete overlays for fatigue[J]. Advanced Materials Research, 2012, 510: 478-483.
[17] 胡小弟,王枝懿,周富杰,等.沥青混合料抗反射裂缝性能的快速评价方法[J].中外公路,2014,34(2):221-225.
HU X D, WANG Z Y, ZHOU F J, et al. Rapid evaluation method for anti reflective crack performance of asphalt mixture[J]. Journal of China & Foreign Highway, 2014, 34(2): 221-225 (in Chinese).
[18] 陈静云,王峻,刘佳音.高比例RAP热再生沥青混合料低温抗裂性能[J].沈阳建筑大学学报(自然科学版),2013,29(5):782-787.
CHEN J Y, WANG J, LIU J Y. Study on low temperature anti-cracking performance of hot recycled asphalt mixture at high proportion of RAP[J]. Journal of Shenyang Jianzhu University (Natural Science), 2013, 29(5): 782-787 (in Chinese).
[19] 曹卫东,于得水,杨波,等.拌和工艺参数对厂拌热再生混合料性能的影响[J].科学技术与工程,2020,20(24):10032-10038.
CAO W D, YU D S, YANG B, et al. Effect of mixing process parameters on the performance of central plant hot recycling mixture[J]. Science Technology and Engineering, 2020, 20(24): 10032-10038 (in Chinese).
[20] MA W, Tran N H, Taylor A J, et al. Proposed improvements to overlay test for determining cracking resistance of asphalt mixtures[C]//Transportation Research Board 93rd Annual Meeting, Transportation Research Board, 2014: 16.
[21] ZHOU F, SCULLION T. Overlay tester: a simple performance test for thermal reflective cracking (with discussion and closure)[J]. Journal of the Association of Asphalt Paving Technologists, 2005, 74: 443-483.
[22] TEX-248-F. Overlay test[S]. Texas: Construction Division, Texas Department of Transportation, 2009: 1-6.
[23] 王杰,秦永春,曾蔚,等.厂拌热再生SBS改性沥青混合料抗裂性能[J].长安大学学报(自然科学版),2019,39(4):27-34+51.
WANG J, QIN Y C, ZENG W, et al. Crack resistance of mixture with reclaimed SBS modified asphalt pavement from central mixing plant[J]. Journal of Chang'an University (Natural Science Edition), 2019, 39(4): 27-34+51 (in Chinese).