委内瑞拉岩沥青改性沥青混合料配合比设计及性能研究
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摘要
委内瑞拉岩沥青(Venezuela Rock Asphalt,简称VRA)中沥青含量高达95%以上,是一种沥青含量高、灰分杂质少且易于加工的硬质天然沥青。为了分析其用于沥青改性剂的适用性,选取表面层常用AC-13C型沥青混合料,在0%～1%范围内按0.25%间隔选取5种不同VRA掺量,对其改性沥青混合料进行了配合比设计和路用性能检验。首先,以普通沥青混合料配合比设计结果为基准,根据VRA中纯沥青和矿物质分别等量替代普通沥青混合料中基质沥青和矿粉的原则,提出了VRA改性沥青混合料配合比设计调整的计算公式;同时,通过干法和湿法两种拌和工艺对比,确定了适宜于VRA改性沥青混合料拌制的温度范围与干法工艺。然后,分别进行了不同VRA掺量改性沥青混合料的路用性能试验,结果显示,随着VRA掺量的增加,VRA改性沥青混合料的马歇尔稳定度、动稳定度、抗弯拉强度和劲度模量呈加速递增变化,残留稳定度和冻融劈裂强度比呈先增加后减小变化,而流值呈递减变化,最大弯拉应变呈平缓的加速递减变化,表面渗水系数和构造深度变化不大。研究结果表明,VRA的掺入可有效增强其改性沥青混合料的整体黏结性能和抗变形能力,并显著提高高温稳定性和抗疲劳性能,有效改善水稳定性,但对低温抗裂性能有一定的不利影响,而对表面抗渗和抗滑性能无明显影响。故VRA较适合于南方地区沥青路面使用,根据试验结果建议VRA的适宜掺量范围为其改性沥青混合料质量的0.25%～0.75%。
The asphalt content is up to 95% or more in Venezuela Rock Asphalt(VRA),which is a kind of hard natural asphalt with high in asphalt content,less in ash and impurities and easy to process.In order to analyze the applicability of VRA for being used to asphalt modifier,and through selecting the AC-13 Ctype of asphalt mixture commonly used in the surface layer and five different mixing amounts of VRA mass ratio of VRA to its modified asphalt mixture from 0%to 1%in accordance with the 0.25%intervals,the mix design and pavement performance verification for VRA modified asphalt mixture are carried out.Firstly,based on the results of mix design of common asphalt mixture,and according to the principle that the pure asphalt and mineral in VRA replace the equivalent base asphalt and mineral powder in the common asphalt mixture respectively,the adjustment formulas of mix design are proposed for the VRA modified asphalt mixture.Meanwhile,through the comparisons of two mixing processes between dry method and wet method,the temperature ranges and dry process which are suitable for mixing VRA modified asphalt mixture are determined.Lastly,the pavement performances of modified asphalt mixture under different VRA mixing amounts are tested respectively.The results show that,along with the increase of VRA mixing amount,all the Marshall stability,dynamic stability,flexural tensile strength and stiffness modulus of VRA modified asphalt mixture have accelerative increasing changes,both the residual stability and freeze-thaw splitting tensile strength ratio increase first and then decrease,the flow value has decreasing change,the maximum flexural tensile strain has gently accelerate decreasing change,and both the surface water permeability coefficient and texture depth have little changes.Therefore,it shows that the mixing VRA can effectively enhance the whole bond behavior and deformation resistance for the VRA modified asphalt mixture,significantly increase the high temperature stability and fatigue resistance and effectively improve the water stability,but it has some adverse effects on the low temperature crack resistance and no obvious effects on the surface impermeability and skid resistance.The VRA is more suitable for the use of asphalt pavement in the southern areas.According to the test results,it is suggested that the suitable range of mixing amount of VRA is 0.25%～0.75% of the mass of its modified asphalt mixture.
The asphalt content is up to 95% or more in Venezuela Rock Asphalt(VRA),which is a kind of hard natural asphalt with high in asphalt content,less in ash and impurities and easy to process.In order to analyze the applicability of VRA for being used to asphalt modifier,and through selecting the AC-13 Ctype of asphalt mixture commonly used in the surface layer and five different mixing amounts of VRA mass ratio of VRA to its modified asphalt mixture from 0%to 1%in accordance with the 0.25%intervals,the mix design and pavement performance verification for VRA modified asphalt mixture are carried out.Firstly,based on the results of mix design of common asphalt mixture,and according to the principle that the pure asphalt and mineral in VRA replace the equivalent base asphalt and mineral powder in the common asphalt mixture respectively,the adjustment formulas of mix design are proposed for the VRA modified asphalt mixture.Meanwhile,through the comparisons of two mixing processes between dry method and wet method,the temperature ranges and dry process which are suitable for mixing VRA modified asphalt mixture are determined.Lastly,the pavement performances of modified asphalt mixture under different VRA mixing amounts are tested respectively.The results show that,along with the increase of VRA mixing amount,all the Marshall stability,dynamic stability,flexural tensile strength and stiffness modulus of VRA modified asphalt mixture have accelerative increasing changes,both the residual stability and freeze-thaw splitting tensile strength ratio increase first and then decrease,the flow value has decreasing change,the maximum flexural tensile strain has gently accelerate decreasing change,and both the surface water permeability coefficient and texture depth have little changes.Therefore,it shows that the mixing VRA can effectively enhance the whole bond behavior and deformation resistance for the VRA modified asphalt mixture,significantly increase the high temperature stability and fatigue resistance and effectively improve the water stability,but it has some adverse effects on the low temperature crack resistance and no obvious effects on the surface impermeability and skid resistance.The VRA is more suitable for the use of asphalt pavement in the southern areas.According to the test results,it is suggested that the suitable range of mixing amount of VRA is 0.25%～0.75% of the mass of its modified asphalt mixture.
引文
[1]李瑞霞,郝培文,王春,等.布敦岩沥青改性机理[J].公路交通科技,2011,28(12):16-20,38.LI Rui-xia,HAO Pei-wen,WANG Chun,et al.Modified mechanism of Buton rock asphalt[J].Journal of Highway and Transportation Research and Development,2011,28(12):16-20,38.
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[5]李立寒,孙艳娜,王飞.岩沥青对软硬沥青复配混合料的增强作用[J].建筑材料学报,2013,16(6):1087-1091.LI Li-han,SUN Yan-na,WANG Fei.Enhancement effect of rock asphalt on mixture of soft asphalt and hard asphalt compound binder[J].Journal of Building Materials,2013,16(6):1087-1091.
[6]刘黎萍,秦钜泽,洪奕尚.布敦岩沥青混合料拌和工艺优化研究[J].公路,2018(2):52-57.LIU Li-ping,QIN Ju-ze,HONG Yi-shang.Research on optimization of mixing process of asphalt mixture containing Buton rock asphalt(BRA)[J].Highway,2018(2):52-57.
[7]黄文通,徐国元.北美岩沥青改善混合料水稳定性的机理分析[J].公路,2014(2):159-163.HUANG Wen-tong,XU Guo-yuan.Mechanism analysis on water stability of asphalt mixtures modified by Uintaite[J].Highway,2014(2):159-163.
[8]查旭东,白璐,王玮.BRA改性沥青混合料路用性能研究[J].交通科学与工程,2009,25(1):10-13.ZHA Xu-dong,BAI Lu,WANG Wei.Study of pavement performance for BRA modified asphalt mixture[J].Journal of Transport Scienceand Engineering,2009,25(1):10-13.
[9]陆学元,凌东强,胡应德.布敦沥青岩特性与技术标准研究[J].重庆交通大学学报:自然科学版,2018,37(8):37-48.LU Xue-yuan,LING Dong-qiang,HU Ying-de.Characteristics and technology standard of Buton-asphaltrock[J].Journal of Chongqing Jiaotong University:Natural Science,2018,37(8):37-48.
[10]宋小金,樊亮,申全军.国产天然岩沥青改性沥青混合料路用性能研究[J].公路,2009(12):135-139.SONG Xiao-jin,FAN Liang,SHEN Quan-jun.A study on pavement performance of Chinese-made natural rock asphalt modified asphalt mixture[J].Highway,2009(12):135-139.
[11]李宏亮,刘涛,谢海巍.新疆乌尔禾岩沥青改性沥青的试验研究[J].公路工程,2009,34(6):58-63.LI Hong-liang,LIU Tao,XIE Hai-wei.Xinjiang Wuerhe rock asphalt modified asphalt experimental study[J].Highway Engineering,2009,34(6):58-63.
[12]查旭东,胡锦湘,刘安辉,等.布敦岩沥青材料性质试验分析[J].长沙理工大学学报:自然科学版,2017,14(4):10-17.ZHA Xu-dong,HU Jin-xiang,LIU An-hui,et al.Experimental analysis on material properties for Buton rock asphalt[J].Journal of Changsha University of Science and Technology:Natural Science,2017,14(4):10-17.
[13]辛星,刘明,张新农,等.不同品种岩沥青对沥青混合料性能的影响研究[J].石油沥青,2012,26(2):11-16.XIN Xing,LIU Ming,ZHANG Xin-nong.Influence of different kinds of rock asphalt on the performance of asphalt mixture[J].Petroleum Asphalt,2012,26(2):11-16.
[14]宋国森.不同掺配工艺对天然岩沥青改性沥青混合料路用性能的影响[J].现代交通技术,2007,4(3):12-14.SONG Guo-sen.Effects of manufacturing process of different modified asphalt on mixture properties[J].Modern Transportation Technology,2007,4(3):12-14.
[15]查旭东,钱光耀,张云帆.BRA改性沥青混合料AC-13C适宜掺量的研究[J].交通科学与工程,2015,31(2):1-5,33.ZHA Xu-dong,QIAN Guang-yao,ZHANG Yunfan.Research on suitable mixing amount for BRA modified asphalt mixture AC-13C[J].Journal of Transport Science and Engineering,2015,31(2):1-5,33.
[16]宋亮亮,姚晓光.天然沥青混合料路用性能研究[J].石油沥青,2017,31(1):7-13.SONG Liang-liang,YAO Xiao-guang.Research on pavement performance of natural asphalt mixture[J].Petroleum Asphalt,2017,31(1):7-13.
[17]邓杰元.委内瑞拉岩沥青(VRA)改性沥青及其混合料性能研究[D].长沙:长沙理工大学,2018.DENG Jie-yuan.Research on performances of modified asphalt and its mixture for Venezuela rock asphalt(VRA)[D].Changsha:Changsha University of Science and Technology,2018.
[2] Kok B V,Yilmaz M,Guler M.Evaluation of high temperature performance of SBS+Gilsonite modified binder[J].Fuel,2011,90(10):3093-3099.
[3]吕松涛,郑健龙.新疆岩沥青改性沥青混合料疲劳性能的试验研究[J].交通科学与工程,2012,28(1):16-20.LV Song-tao,ZHENG Jian-long.Research on fatigue character tests of asphalt mixtures modified by Xinjiang rock asphalt[J].Journal of Transport Scienceand Engineering,2012,28(1):16-20.
[4] Nasrekani A A,Naderi K,Nakhaei M,et al.Hightemperature performance of gilsonite-modified asphalt binder and asphalt concrete[J].Liquid Fuels Technology,2016,34(21):1783-1789.
[5]李立寒,孙艳娜,王飞.岩沥青对软硬沥青复配混合料的增强作用[J].建筑材料学报,2013,16(6):1087-1091.LI Li-han,SUN Yan-na,WANG Fei.Enhancement effect of rock asphalt on mixture of soft asphalt and hard asphalt compound binder[J].Journal of Building Materials,2013,16(6):1087-1091.
[6]刘黎萍,秦钜泽,洪奕尚.布敦岩沥青混合料拌和工艺优化研究[J].公路,2018(2):52-57.LIU Li-ping,QIN Ju-ze,HONG Yi-shang.Research on optimization of mixing process of asphalt mixture containing Buton rock asphalt(BRA)[J].Highway,2018(2):52-57.
[7]黄文通,徐国元.北美岩沥青改善混合料水稳定性的机理分析[J].公路,2014(2):159-163.HUANG Wen-tong,XU Guo-yuan.Mechanism analysis on water stability of asphalt mixtures modified by Uintaite[J].Highway,2014(2):159-163.
[8]查旭东,白璐,王玮.BRA改性沥青混合料路用性能研究[J].交通科学与工程,2009,25(1):10-13.ZHA Xu-dong,BAI Lu,WANG Wei.Study of pavement performance for BRA modified asphalt mixture[J].Journal of Transport Scienceand Engineering,2009,25(1):10-13.
[9]陆学元,凌东强,胡应德.布敦沥青岩特性与技术标准研究[J].重庆交通大学学报:自然科学版,2018,37(8):37-48.LU Xue-yuan,LING Dong-qiang,HU Ying-de.Characteristics and technology standard of Buton-asphaltrock[J].Journal of Chongqing Jiaotong University:Natural Science,2018,37(8):37-48.
[10]宋小金,樊亮,申全军.国产天然岩沥青改性沥青混合料路用性能研究[J].公路,2009(12):135-139.SONG Xiao-jin,FAN Liang,SHEN Quan-jun.A study on pavement performance of Chinese-made natural rock asphalt modified asphalt mixture[J].Highway,2009(12):135-139.
[11]李宏亮,刘涛,谢海巍.新疆乌尔禾岩沥青改性沥青的试验研究[J].公路工程,2009,34(6):58-63.LI Hong-liang,LIU Tao,XIE Hai-wei.Xinjiang Wuerhe rock asphalt modified asphalt experimental study[J].Highway Engineering,2009,34(6):58-63.
[12]查旭东,胡锦湘,刘安辉,等.布敦岩沥青材料性质试验分析[J].长沙理工大学学报:自然科学版,2017,14(4):10-17.ZHA Xu-dong,HU Jin-xiang,LIU An-hui,et al.Experimental analysis on material properties for Buton rock asphalt[J].Journal of Changsha University of Science and Technology:Natural Science,2017,14(4):10-17.
[13]辛星,刘明,张新农,等.不同品种岩沥青对沥青混合料性能的影响研究[J].石油沥青,2012,26(2):11-16.XIN Xing,LIU Ming,ZHANG Xin-nong.Influence of different kinds of rock asphalt on the performance of asphalt mixture[J].Petroleum Asphalt,2012,26(2):11-16.
[14]宋国森.不同掺配工艺对天然岩沥青改性沥青混合料路用性能的影响[J].现代交通技术,2007,4(3):12-14.SONG Guo-sen.Effects of manufacturing process of different modified asphalt on mixture properties[J].Modern Transportation Technology,2007,4(3):12-14.
[15]查旭东,钱光耀,张云帆.BRA改性沥青混合料AC-13C适宜掺量的研究[J].交通科学与工程,2015,31(2):1-5,33.ZHA Xu-dong,QIAN Guang-yao,ZHANG Yunfan.Research on suitable mixing amount for BRA modified asphalt mixture AC-13C[J].Journal of Transport Science and Engineering,2015,31(2):1-5,33.
[16]宋亮亮,姚晓光.天然沥青混合料路用性能研究[J].石油沥青,2017,31(1):7-13.SONG Liang-liang,YAO Xiao-guang.Research on pavement performance of natural asphalt mixture[J].Petroleum Asphalt,2017,31(1):7-13.
[17]邓杰元.委内瑞拉岩沥青(VRA)改性沥青及其混合料性能研究[D].长沙:长沙理工大学,2018.DENG Jie-yuan.Research on performances of modified asphalt and its mixture for Venezuela rock asphalt(VRA)[D].Changsha:Changsha University of Science and Technology,2018.