摘要
集料对沥青混合料的性能有着重要的作用,集料的几何特性及其在混合料中的结构形态,骨架性能和填充性能直接影响沥青混合料性能和质量,我国高速公路沥青路面使用的各种规格碎石大多源于不同碎石场,集料质量参差不齐;而且建设管理人员对集料几何特性重视程度不够,使得新建沥青路面出现早期破坏现象。如何控制集料的几何特性成为迫切需要解决的问题。因此,深入研究集料几何特性与结构对沥青混合料性能影响有着重要的意义。
粗型密级配沥青混合料(C型)和骨架型沥青混合料(SMA)对针片状含量敏感程度远大于细型密级配沥青混合料(F型);对密级配沥青混合料(包括粗型和细型),针片状含量不宜超过13%;对骨架型沥青混合料(SMA),针片状含量不宜超过10%。细集料未压实空隙率FAA与沥青混合料性能的相关性较好,可作为评价沥青混合料细集料棱角性指标;细集料未压实空隙率FAA不宜小于45%;对于未压实空隙率FAA小于40%的天然砂,工程中不宜使用;对于未压实空隙率FAA大于45%的天然砂,砂用量不宜超过10%。
集料的结构组成对沥青混合料的性能影响非常显著。粗集料的骨架支撑作用对沥青混合料的高温性能起着决定性作用,论文首次提出动稳定指数(Dynamic Stability Index,简称DSI )评价沥青混合料骨架性能。相关性、回归分析得出:对沥青混合料骨架性能最敏感、影响幅度最大的是4.75—9.5mm颗粒,其余依次排序为16—19mm、13.2—16mm;9.5—13.2mm敏感性不强;依据动稳定指数(DSI)的不同,划分了沥青混合料级配骨架性能的强、中、弱区。
细集料填充性能显著影响沥青混合料的耐久性。论文首次提出细集料填充敏感性评价指标:单位筛余量的空隙率变化率RRV。RRV值不仅能很好的表征细集料的填充敏感性能,还能很好的表征干涉敏感性能。沥青混合料干涉敏感筛孔为:1.18mm,0.6mm筛孔,填充敏感筛孔为:0.3mm筛孔;细集料填充敏感筛孔与沥青混合料路用性能有很好的相关性。
Geometric characteristics play a important role to performance of Asphalt Mixture, the shape of aggregate and its configuration in asphalt mixture such as Skeleton performance and filling characteristics all have strong impact to performance of asphalt mixture. For the reason of the aggregate which was used in asphalt pavement of highway is gathered from different field ,the quality of aggregate is ropy wholly. And for the other reason which the manager is lack of attention to geometric characteristics of aggregate, some new pavement were damaged in early time. So, it is very important to research the geometric characteristics of aggregate for asphalt mixture.
The coarse asphalt mixture and SMA have more sensitivity than fine asphalt mixture; the content of flat and elongated particles should be less than 13%; for SMA , it should be less than 10%. The FAA of fine aggregate has strong relativity with performance of asphalt mixture and it can be used in evaluate angularity of fine aggregate. The FAA of fine aggregate should be less than 45%; we should not use natural sand which its FAA less than 40%, we should use sand less than 10%which its FAA less than 45%.
The structure of aggregate play a important role to performance of Asphalt Mixture. Sustensation of skeleton has strong impact to high-temperature performance of asphalt mixture. The study takes DSI to evaluate skeleton performance asphalt mixture firstly. According to relative and regressive analysis ,the most sensitive factor is 4.75-9.5mm aggregate, the other is 16—19mm、13.2—16mm aggregate , the 9.5—13.2mm aggregate is the most in sensitive factor. According to different DSI, we partition the strong、ordinary、feeble area of asphalt mixture.
The filling performance play a important role to lasting-performance of Asphalt Mixture. The study takes filling sensitive index of fine aggregate RRV firstly. The RRV not only reflect filling sensitive performance, but also reflect intervening sensitive performance. The intervening sensitive size is: 1.18mm、0.6mm, the filling sensitive size is : 0.3mm; the filling sensitive size of fine aggregate has strong relativity with performance of asphalt mixture.
引文
[1]中华人民共和国行业标准·公路沥青路面设计规范(JTG D50—2006)[S].北京:人民交通出版社,2006.
[2]中华人民共和国行业标准·公路沥青路面施工技术规范(JTG F40-2004)[S].北京:人民交通出版社,2004.
[3]中华人民共和国行业标准·公路工程沥青与沥青混合料试验规程(JTJ052-2000)[S].北京:人民交通出版社,2000.
[4]中华人民共和国行业标准·公路工程集料试验规程(JTJ058-2000)[S].北京:人民交通出版社,2000.
[5]中华人民共和国行业标准·公路改性沥青路面施工技术规范(JTJ036-98)[S].北京:人民交通出版社,1999.
[6]张登良·沥青路面[M].北京:人民交通出版社,1999.
[7]沈金安·沥青及沥青混合料路用性能[M].北京:人民交通出版社,2001.
[8]吕伟民·沥青混合料设计原理与方法[M].上海:同济大学出版社,2001.
[9]余叔藩译·热拌沥青混合料材料、混合料设计与施工[M].重庆交通科研设计院,2002.
[10]梁乃兴、韩森、屠书荣·现代路面与材料[M].北京:人民交通出版社,2003.
[11]郝培文·沥青路面施工与维修技术.北京[M]北京:人民交通出版社,2001.
[12]胡长顺、黄辉华·高等级公路路基路面施工技术[M].北京:人民交通出版社,1998.
[13] Prithvi S. Kandhal, Maqbool A. Khatri,and John B. Motter. Evaluation of Particle Shape and Texture of Mineral Aggregates and Their Blends[R].NCAT Report.May 1998.
[14] M. Shane Buchanan.Evaluation of The Effect of Flat and Elongated Particles on The Performance of Hot Mix Asphalt Mixtures[R]. NCAT Report No. 2000.
[15]Thomas Fletcher,Chandan Chandan,Eyad Masad,and Krishna Sivakumar.Aggregate Imaging System (AIMS) for Characterizing The Shape of Fine and Coase Aggregates[R].TRB 2003
[16] Prithvi S. Kandhal,John B. Motter,Maqbool A. Khatri. Evaluation of Particle Shape and Texture: Manufactured Versus Natural Sands[R].NCAT Report .January 1998.
[17]沙庆林.多碎石沥青混凝土SAC系列设计与施工[M].人民交通出版社,2005..
[18] Joe W. Button,A.Chowdhury,D.Little,and D.Park.Effect of Fine Aggregate Properties on Permanent Deformation.Texas Transportation Institute.Texas A&M University[R],College Station,2001.
[19] Anthony D.Stakston,Hussain U.Bahia,and Jared J.Bushek.Effect of Fine Aggregate Angularity on Compaction and Shearing Resistance of Asphalt Mixtures[R]. Transportantion Reseach Record.2002.
[20]贾渝·Superpave混合料设计方法最新进展[J].中外工程,2001(6)
[21] John P.Zaniewski,Ph..D.Sean Rafferty. Evaluation of The Compacted Aggregate Resistance Test[R]. Transportantion Reseach Record 2004.
[22] Vavrik, W. R., W. J. Pine, G. A. Huber, and R. Bailey:The Bailey Method of Gradation Evaluation: The Influence of Aggregate Gradation and Packing Characteristics on Voids in the Mineral Aggregate[J]. Journal of the Association of Asphalt PavingTechnologists, Vol. 70, 2001.
[23]韩海峰,吕伟民·细集料棱角性对沥青混合料性能的影响[J].同济大学学报, 2002(3)
[24]陈建旭,林桂仪·陈虹洁.粒料对沥青混凝土性能之影响[J].上海公路.2003(4).
[25]沙庆林·SAC和其他粗集料断级配的集料级配设计方法[J].公路,2005(1)
[26]吴旷怀,张肖宁·沥青混合料设计棕述[J].广州大学学报(自然科学版),2005.04(5)
[27]赵永利,黄晓明·集料级配基本性能的试验研究[J].公路交通科技,2004(6)
[28]刘中林,郝培文,戴经梁·大碎石沥青混合料LSAM骨架密实型综合设计方法[J].公路,2003(6)
[29]许志鸿,刘红,王宇辉,马卫民·细集料对沥青混合料性能的影响[J].中国公路学报.2003
[30]许志鸿,陈兴伟,刘红·Superpave级配范围[J].交通运输工程学报. 2003(03)
[31] SHRP-A-407,The Superpave Mix Design Manual for New Construction and Overlays[R], N. C.R, USA, 1994.
[32] SHRP-A-415, Permanent deformation Response of Asphalt Aggregate Mixes[R], N. C. R, USA, 1994.
[33] FHWA, HAPA, Superpave Construction Guideline[R]. NAPA,FHWA SP,1998.
[34] Asphalt Institute. Superpave Performance Graded Asphalt Binder Specification and Testing Superpave Series No.1(SP-1) SHRP [R],1994.
[35] Asphalt Institute. Superpave Level 1 Mix Design Superpave Series No.2 SHRP (SP-2) [R],1994.
[36]沈金安·改性沥青与SMA路面.人民交通出版社[M].1999.
[37]徐定华,徐敏·混凝土材料学.中国标准出版社[M].2002.
[38] Vincent C.Janoo.Quantification of Shape,Angularity, and Surface Textureof Base Course Materials. Special Report 98-1[R].January 1998.
[39] Norbert H.Maerz. Technical and Computational Aspects of the Measurement of Aggregate Shape byDigital Image Analysis[J]. Journal of Computing in Civil Engineering.Vol.18,No.1.2004.
[40] Joe W. Button,A.Chowdhury,D.Little,and D.Park.Effect of Fine Aggregate Properties on Permanent Deformation[J].Texas Transportation Institute.Texas A&M University,College Station,2001.
[41] Thomas Fletcher,Chandan Chandan,Eyad Masad,and Krishna Sivakumar.Aggregate Imaging System (AIMS) for Characterizing The Shape of Fine and Coase Aggregates[R].TRB 2003 Annual Meeting
[42]尾崎佑辅等·不同表层和中层混合料的组合结构的抗车辙能力[R].东京.第四届日本道路会议(B),1997.
[43] William R.Vavrik,Randy J.Fries,and Samuel H.Carpenter.Effect of Flat and Elongated Coarse Aggregate on Characteristics of Gyratory Compacted Samples[R].Transportantion Reseach Record .1999.
[44]李庆华·材料力学[M].西南交通大学出版社.1994.
[45]彭波·改性沥青玛蹄脂及沥青玛蹄脂碎石路用性能[J].长安大学学报(自然科学版),2005(6).
[46]彭波、郝培文·利用基质沥青铺筑SMA的性能研究[J].重庆交通学院学报,2001(4).
[47]沈金安,李福晋·高速公路沥青路面早期损坏分析与防治对策[M].人民交通出版社,2004.
[48] Norbert H.Maerz. Technical and Computational Aspects of the Measurement of Aggregate Shape by Digital Image Analysis[J]. Journal of Computing in Civil Engineering.Vol.18,No.1.2004.
[49]彭波·不同类型加筋沥青胶浆性能研究[J].交通运输工程学报,2006(2).
[50]彭波、刘宏瑛、戴经梁·SAC及Superpave沥青混合料路用性能的研究[J].长安大学学报(自然科学版),2002(6).
[51]郝培文,徐金枝,周怀治·应用贝雷法进行级配组成设计的关键技术[J].长安大学学报(自然科学版)2004(6).
[52]彭波,袁万杰,陈忠达·车辙系数评价沥青混合料抗车辙性能[J].华南理工大学学报(自然科学版),2005(6).
[53]陈忠达,袁万杰·沥青混合料高温性能评价指标[J].长安大学学报,2006.09(5).
[54]彭波·基于变i法理论的级配组成设计方法[J]·武汉理工大学学报(交通科学与工程版),2005(5).
[55]陈忠达,袁万杰,高春海·多级嵌挤密实级配设计方法研究[J].中国公路学报,2006,19(1)
[56]林绣贤·沥青混凝土合理集料组成的计算公式[J].华东公路,2003(01).
[57]彭波、袁万杰·贝雷法在SMA-16型集料级配设计中的应用[J].公路交通科技,2005(12).
[58]彭波,李文瑛·多级嵌挤型沥青混合料路用性能[J].中南公路工程,2006(2).
[59]曾凡,胡永平,杨毅·矿物加工颗粒学[M].中国矿业大学出版社.2001(5).
[60]彭波·不同测定方法对沥青混合料密度测定值影响[J].公路,2005(5).
[61]毛泽华,李闯民·细集料密度对沥青混合料集料间隙率值的影响[J].中南公路工程,2006.31(3)
[62]沙庆林·空隙率对沥青混凝土的重大影响[J].国外公路,2001(1).
[63] Ta-Peng Chang, Shi-Hong lin, Huang-Chin Lin, Ping-Ru Lin. Effects of Various Fineness MODULI of Fine Aggregate on Engineering Properties of High-Performance Concrete[J]. Journal of the Chinese Institute of Engineers,Vol.24, 2001(3).
[64]陈春,许志鸿,陈兴伟·沥青混合料空隙率影响因素研究[J].公路.2003(4)
[65] Waddah S. Influence of Aggregate Type And Gradation on Voids of Asphalt Concrete Pavements[J]. Abdullah Journal of Materials in Civil Engineering , 1998(5).
[66] JON EPPS. Westrack performance-interim findings[J].Journal of AAPT,1998,21(6)
[67]PAUL TENG T. Performance of coarse-graded mixes at westrack premature rutting[R].Westrack Analysis Final Report,1998
[68]德交通部·德国沥青路面施工修订技术合同条件及规范.交通部重庆公路科学研究所技术信息室,1997
[69]牟彬·关于沥青混凝土中细集料的探讨[J].北方交通,2006(6).
[70]彭波,田见效,陈忠达·Superpave沥青混合料路用性能的研究[J].长安大学学报(自然科学版),2003(5).
[71]彭波、陈忠达、戴经梁·高性能沥青混凝土路用性能的研究[J].重庆交通学院学报,2003(3).
[72]彭波·粗骨架结构沥青混合料路用性能[J].公路,2004(9).