摘要
温拌沥青混合料具有施工温度低、耗能低、延长施工时效、环保等诸多性能特点,尽管目前市场上温拌剂品种较多,但是品质良莠不齐,且对温拌剂降温效果的评价方法及其混合料的路用性能与施工技术没有系统研究,致使温拌沥青混合料应用无规可循。因此论文在乳化型温拌剂研发的基础上,对温拌沥青混合料性能和施工技术进行研究。
论文从现有温拌剂产品优缺点以及国内温拌剂产品研发现状入手,确定产品开发方向为乳化型温拌剂。采用表面化学理论,研究了温拌剂的乳化和润滑机理,以综合协调温拌剂的乳化性能和沥青混合料水稳性能为出发点,开发出具有提高沥青混合料水稳定性和和易性的乳化型温拌剂产品——HH-X型温拌剂。
利用动态扭矩传感器,研究了搅拌齿所受扭矩与沥青混合料的摩擦和粘流性间的关系,开发出了沥青混合料和易性试验仪,提出了沥青混合料和易性指数指标。采用和易性指数曲线,研究了温拌沥青混合料的降温效果,通过与SGC法确定的空隙率曲线进行对比分析,提出了和易性试验仪评价温拌剂降温效果的方法,并推荐了低温条件下温拌沥青混合料各施工工序温度公式:T低=T正常+A×(10-t),解决了如何确定温拌沥青混合料各环节最佳施工温度技术难题。
通过温拌剂掺量对沥青粘附性、沥青混合料空隙率和水稳定性及和易性的影响研究,得出当HH-X型温拌剂与沥青质量掺量比例为10﹕90时其性能最优。分别对添加HH-X型温拌剂的SBS改性沥青、90#和70#基质沥青性能的变化进行了研究,结果表明在不改变沥青其它性能的基础上,可显著提高沥青与集料的粘附性和老化性能指标。
根据沥青及沥青混合料老化原理,利用旋转薄膜烘箱,改进了短期老化试验方法,提出了温拌沥青及其混合料的老化试验方法及试验参数,利用该方法研究了温拌沥青及其混合料的老化性能,试验结果表明温拌沥青混合料的老化程度远低于热拌沥青混合料。通过对添加HH-X型温拌剂的沥青混合料性能进行试验分析,发现在不影响沥青混合料高温性能的情况下可显著改善其水稳定性和低温性能。室内疲劳性能试验研究表明:添加温拌剂后能显著提高混合料疲劳方程的k值,并使n值减小。采用ABAQUS和fe-safe软件对沥青路面进行疲劳寿命计算,结果表明HH-X温拌沥青混合料疲劳寿命是热拌沥青混合料的1.12倍。通过与同类乳化型温拌剂和有机添加剂Sasobit对沥青及其混合料性能的对比,证明了HH-X温拌剂性能较优。
结合对实体工程的研究,系统地提出了乳化型温拌沥青混合料施工质量控制方法和技术指标要求;考虑寿命周期成本,HH-X型温拌剂可降低工程造价约34万元/Km,由于其可显著降低CO_2的排放量,节省了能源消耗,因此其应用具有显著的社会经济效益。
论文的研究成果对温拌剂及温拌沥青混合料的性能评价、施工技术具有指导作用,为温拌沥青混合料的应用提供了技术支撑。
Warm mix asphalt has the performance characteristics of low construction temperature,low energy consumption, extending the time of construction, environmental protection and soon. However, there are many kinds of warm-mixed agents on the market currently, and thequality is uneven, some good and some bad. And there are no system researches on theevaluation method of warm-mixed agent cooling effect, the road performance of mixtureasphalt and construction technology. It leads no rules to follow in warm mix asphaltapplications. So, based on the development of emulsification of warm-mixed agent, this thesisresearched the performance and construction technology of warm mix asphalt mixture.
Paper started from the advantages and disadvantages of warm-mixed agents as well asdomestic warm-mixed agent product development, determined the product developingdirection is emulsification warm-mixed agent. Using surface chemistry theory, studied theemulsion and lubrication mechanism of warm-mixed agent, in order to balance theemulsifying performance of warm-mixed agent and water stability performance of asphaltmixture, developed a new emulsion warm-mixed agent product which improve the waterstability and workability of asphalt mixture--HH-X warm-mixed agent.
Using dynamic torque sensor, researched the relationship between torque of the stirringgear suffered and friction and viscous of asphalt mixture, developed the workability of asphaltmixture tester, and proposed the indicator of asphalt mixture workability index. Usingworkability index curve, studied the temperature cooling effect of warm mixture asphalt, andcomparative analyzed with the porosity curve which determined by SGC method, and putforward that workability tester method is a way to evaluate cooling effect of warm-mixedagent, recommended a temperature formula under the condition of low air temperature in theconstruction process: Tlow=Tnorm+A×(10-t),and solved the problem of how to determine thebest temperature of asphalt mixture in every construction stages, and
Through the research warm-mixed agent dosage impact on the adhesion performance ofasphalt, asphalt mixture void ratio, water stability and workability, found that the bestblending ratio of HH-X warm-mixed agent and asphalt is10:90. Added HH-X warm-mixedagent into SBS modified asphalt,90#and70#matrix asphalt respectively, and studied theperformance changes, the results show that with no changing on other performance of asphalt,HH-X can significantly improve the adhesion performance between asphalt and aggregate andaging properties.
According to the aging principle of asphalt and asphalt mixture, using rotary film oven,improved the test method of short-term aging, and the proposed aging test methods and test parameters of warm mixture asphalt. Using this method researched the aging properties ofwarm mix asphalt. Test results show that: the aging of warm mixture asphalt is much lowerthan that of hot mixture asphalt. And found that HH-X-type agent in the warm mix asphaltmixture has a little affect on high-temperature performance, but it can significantly improveits water stability and low temperature performance, and then come the conclusions thatIndoor fatigue test research shows: the addition of warm-mixed agent can significantlyimprove the k-value of, and the n-value decreased. Using ABAQUS and fe-safe softwarecalculating fatigue life of asphalt pavement, the results show that HH-X warm mix asphaltmixture fatigue life is1.12times of hot mix asphalt mixture. And contrast with the similartype of warm-mixed agent and organic additives Sasobit effect on asphalt and asphalt mixtureperformance, proved that HH-X warm-mixed agent is better than others.
According to the real engineering research, proposed the construction quality controlmethods and technical requirements of emulsion type warm mix asphalt mixturesystematically; consider life cycle cost, HH-X warm-mixed agent can reduce engineering costabout340000yuan/Km, because it can significantly reduce the emissions of CO_2,savingenergy consumption, so it’s application has significant social and economic benefits.
The research results of this paper play a guiding role on the performance evaluation ofwarm-mixed agents and warm mixture asphalt and construction technology, and providetechnical support for the application of warm mixture asphalt.
引文
[1]国内外沥青路面调查与分析.江苏省高速公路建设指挥部.2003.6.
[2]徐世法,颜彬,季节,高原.高节能低排放型温拌沥青混合料的技术现状与应用前景[J].公路.2005.7.
[3]李祝龙,丁小军,赵述曾,吴德平.沥青混合料应用中的环境保护[J].交通运输工程学报.2004.4(4):1-4.
[4] Harrison T, Christodulaki L. Innovative processes in asphalt production and applicationstrengthening asphalt's position in helping to build a better world. FirstInternational Conference: World of Asphalt Pavements, Sydney,2000.
[5] Advisory note17–Warm Mix Asphalt a state of the art review [EB/OL].Australian Asphalt PavementAssociation (AAPA). http://www.aapa.san.au/docs/no17.pdf,2000.
[6] Graham C. Hurley,Brian D. Prowell. Evaluation of Aspha-Min Zeolite for Use in Warm Mix Asphalt.NCAT Report05-04.
[7] Graham C. Hurley,Brian D. Prowell. Evaluation of Sasobit for Use in Warm Mix Asphalt. NCATReport05-06.
[8] Graham C. Hurley,Brian D. Prowell. Evaluation of Evotherm for Use in Warm Mix Asphalt.NCAT Report05-06.
[9] Kvasnak,Andrea N. Case Study of Warm Mix Asphalt Moisture Susceptibility in Birmingham,Alabama[A].In:Transportation Research Board Annual Meeting2009Paper#09-3703,2009.
[10]夏漾.Sasobit温拌沥青混合料设计与使用性能[D].长沙:湖南大学,2009.
[11]严世祥.温拌沥青混合料的应用技术研究[D].重庆:重庆大学,2007.
[12]王恕超.温拌沥青改性机理及评价方法研究[D].西安:长安大学,2010.
[13]杨树人.温拌添加剂对沥青和沥青混合料性能的影响[D].重庆:重庆交通大学,2008.
[14]左锋.基于温度的温拌沥青混合料水损害关键因素研究[D].上海:同济大学,2008.
[15]张镇、孙立军.Evotherm温拌沥青混合料控制指标研究[J].武汉理工大学学报,2009(04).
[16]陶卓辉、杜群乐、黄文元.Evotherm温拌沥青混凝土工作原理及低温施工研究[J].公路交通科技,2008(04).
[17]左锋,叶奋.国外温拌沥青混合料技术与性能评价[J].中外公路,2007,27(6).
[18] Cindy K.Estakhri, Rongji Cao, Allex Alvarez-Lugo, and Joe W.Button. Production,Placement, and Performance Evaluation of Warm Mix Asphalt in Texas[A].In: Material,Design, Construction, Maintenance, and Testing of Pavement(GSP193)[C](Proceedingsof Selected Papers from the2009Geohunan International Conference),2009.
[19]刘至飞,吴少鹏,陈美祝.温拌沥青混合料现状及存在问题[A].第一届两岸三地绿色材料学术研讨会论文集[C],武汉,2008:209-213.
[20]李芬.沥青混凝土路面细观结构和水破坏研究[D].武汉:武汉理工大学,2006.
[21]沙庆林.高速公路沥青路面早期破损现象及预防[M].人民交通出版社.2001,5:21-133.
[22] MIL-STD-IS30A, Aircraft Structural integrity Program, Airplane Requirements. USAF,1975
[23]姚卫星,杨庆雄.孔边小裂纹扩展率的描述[J].西北工业大学学报,1987,5(1):107~116.
[24] Wang C H, Miller K J. Short fatigue crack growth under mean stress, uniaxial loading. Fatigue andFracture of Materials and Structures,1993,16(2):181~198.
[25] Dowling N E. Notched member fatigue life prediction combing crack initiation and propagation.Fatigue and Fracture of Engineering Materials and Structures,1979,2(2):129~138.
[26] Sehiwglu H. Fatigue life prediction of notched members based on local strain elastic-plastic fracturemechanics concepts. Engineering Fracture Mechanics,1986,18(6):609~621.
[27] Miller K J. The behavior of short fatigue cracks and their initiation Part I-A review of two recent boods.Fatigue and Fracture of Engineering Materials and Structures,1987,10(1):75~91.
[28] DuQuesnay D L, Topper T H, Ye M T. The effect of notch radios on the fatigue notch factor and thepropagation of short cracks. Miller K J, Delos Rios E R Ed. The Behavior of Short Fatigue Cracks.London: M.E.P.1986:323~335.
[29] Shang D G, Yao W X, Wang D J. A New Approach to the Determination of Fatigue Crack InitiationSize. International Journal of Fatigue,1998,20(9):683~687.
[30]李克唐,张行,付祥炯等.飞机结构损伤容限设计指南[M].北京:航空工业部科学技术情报研究所,1985.
[31]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.
[32]李长来,伍石生,袁卓亚.温度对沥青混合料压实性能的影响研究[J].内蒙古公路与运输,1998,56(3):10.
[33]童姝娟.温度对沥青混合料密度及空隙率的影响[J].市政技术,2006,24(6):441-443.
[34]黄晓明,吴少鹏,赵永利.沥青与沥青混合料[M].南京:东南大学出版社,2002,53-159.
[35]马卫民,曹亚东,严军等.Evotherm温拌沥青混合料技术在中国的应用[J].公路交通科技,2006,23(9):79-81.
[36]郭红兵,陈拴发.Aspha-min温拌沥青混合料技术现状与路用性能[J].中外公路,2008,28(2):152-155.
[37]李中秋,马敬坤.Sasobit改性剂对沥青改性的室内试验分析[J].公路交通科技,2004,21(10):26-29.
[38]李德超.两种温拌沥青混合料添加剂性能室内试验比较[J].石油沥青,2008,22(2):24-30.
[39]张锐,黄晓明,赵永利,等.加入新型添加剂的沥青混合料路用性能研究[J].公路交通科技,2006,23(11):27-30.
[40]张立强,周进川.SBS改性沥青拌和与压实温度的确定[J].公路交通技术,2005,(5):68-72.
[41]李宁利,李铁虎,陈华鑫,等.改性沥青混合料的拌和与压实温度[J].中国公路学报,2007,20(2):40-44.
[42]吴光蓉,祝志刚.中温化改性沥青技术的应用[C].改性沥青与SMA路面应用技术交流会,2004:149-153.
[43]严家伋.沥青材料性能学[M].北京:人民交通出版社,1990.
[44]王捷,贾渝.改性沥青混合料拌和与压实温度确定方法综述[J].公路,2002(12),99-102.
[45]张争奇,李宁利,陈华鑫.改性沥青混合料拌和与压实温度确定方法[J].交通运输工程学报,2007,7(2):36-40.
[46]陈志一,孙见林,庞立果,等.不同添加剂对温拌沥青混合料路用性能的影响[J].中外公路,2007,27(6):168-170.
[47]叶奋,王宝松,贾晓阳,等.成型温度对温拌沥青混合料水稳定性的影响[J].建筑材料学报,2009,12(3):302-309.
[48]吴涛,崔伟,顾良军,等.沥青混合料低温性能评价指标研究[J].公路交通科技,2006,2:32-35.
[49]扬成中,邹启贤.沥青路面水损害机理与防治措施的研究[J].筑路机械与施工机械,2003,4.
[50]王抒音,王哲人,王翠红.提高沥青混合料抗水损害新技术[J].石油大学学报,2002,12.
[51]李国芬,王宏畅.沥青路面水损害及其防治[J].森林工程,2003.
[52]包秀宁,李燕枫,王哲人.沥青混合料水损害试验方法探究[J].广州大学学报,2003,4.
[53] Plancher H. Identification of Chemical Type: in Asphalts Strongly Absorbed at Asphalt/AggregateInterface and Their Relative Displacement by Water.Proceedings, AAPT,1977.
[53]王华.沥青混合料水稳定性研究[D].西安:长安大学,2004.
[54]沙庆林.空隙率对沥青混凝土的重大影响[J].国外公路,2001,1.
[55]吴剑.温拌沥青混合料技术在台金高速公路苍岭隧道中的应用[J].公路交通科技,2008,25(4):132-137.
[56]郝培文.沥青与沥青混合料[M].北京:人民交通出版社,2009.
[57] Drew Boggs. Warm Mix Demo Rock Hill, South Carolina [A].In: NAPA Manul Meeting,2008.
[58] Warm Mix Asphalt Technologies and Research [J].Federal Highway Administration Office ofPavement Technology,2006.
[59]焦学瞬,张春霞,张宏忠.表面活性剂分析[M].化学工业出版社,2009.
[60]周萼秋.沥青混合料拌和的新技术[M].建设机械技术与管理,1994.
[61]许菲菲,刘黎萍.温拌沥青混合料与热拌沥青混合料性能对比[J].公路工程,2009,3.
[62]郭秀华,尤丽华.旋转压实仪及旋转压实参数的研究[J].机械设计与制造,2006,12.
[63]张美坤,黄晓明.采用弯曲应变能评价沥青混合料的低温性能[J].石油沥青,2008,22.
[64]王建勇.沥青混合料原材料质量控制[J].公路,2005,10(10).
[65]王昌衡,陈建民.沥青混合料车辙试验研究[J].中外公路,2003,23.
[66]沈金安.沥青混合料的剥离破坏及抗剥离性能[J].国外公路,1992,12.
[67]吕伟明,孙大权.沥青混合料设计手册[M].北京:人民交通出版社,2007.
[68] H.U.Bahia et a1.Characterization of Modified Asphalt Binders in Superpave Mix Design NCHRPReport459,National Academy Press.Washington D.C.,2001.
[69] L.Lapalu etc.Low temperature rheological and fracture properties of polymer modified bitumens.Eura-sphalt&Eurobitume Congress.Barcelona, September2000.
[69] Dr. Reinhold. Cooling Down the Mix. NAPA.2003.13.
[70] Joe W Button, Cindy Estakhri, Andrew Wimsatt. A Synthesis of Warm2mix Asphalt [R].Texas: TexasTransportation Institute and Texas A&M University System College,2007.
[71] Tejash Gandhi. Effects of Warm Asphalt Additives on Asphalt Binder and Mixture Properties[D].Clemson: Clemson University,2008.