贝雷法和CAVF法在AK-13A和SMA-13的混合料级配设计中的应用
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摘要
传统的沥青混合料配合比设计时,通过粗、中、细3种级配试配,然后再进行马歇尔试件的击实,分析体积指标确定级配、油石比,过程复杂,试验人为误差较大,耗时,耗力。通过贝雷法的粗集料选取密度,CAVF法计算粗细集料比例及油石比,对AK-13A和SMA-13的级配和油石比进行优化,并运用贝雷法3个比例参数CA比、FAc比、FAf比对优化后的级配的骨架嵌挤情况进行判别,以评价优化后的级配是否符合贝雷法3个比例参数的要求,旨在严格控制沥青砂浆体积与粗集料间隙率之间的关系,使沥青混合料的骨架嵌挤效果更好,性能更稳定。研究过程中采用GTM方法成型试件,用马歇尔方法进行沥青混合料路用性能验证。结果表明,粗集料的设计密度位于松装密度及干捣实密度之间时可以达到嵌挤状态,对于一般的密级配沥青混合料如AK-13A,粗集料的设计密度选择松装密度,对于SMA选用干捣实密度。采用改进的CAVF法计算粗细集料的比例并优化级配,通过计算得到的油石比与最终实际采用的油石比基本一致。粗型密级配AK-13A混合料的3参数符合贝雷法范围,形成一种嵌挤密实结构;SMA的3参数都不在贝雷法的范围内,其形成的骨架密实结构是独有的。SMA-13的粉胶比较AK-13A大,同时沥青膜厚度小于AK-13A,但2种混合料路用性能经实践证明都是良好的。
In traditional asphalt mixture gradation design,coarse,medium and fine aggregates are graded at first,and then the Marshall test pieces are compacted to analyse volume index and to determine gradation and asphalt-aggregate ratio. The process of is complex and the experiment has large human error and consumption of time and power. Based on selecting coarse aggregate density with Bailey method and calculating the ratios of coarse and fine aggregates as well as asphalt-aggregate ratio with CAVF method,the gradations and the asphalt-aggregate ratios of AK-13 A and SMA-13 are optimized. The proportional parameters of Bailey method including CA ratio,FAc ratio,and FAf ratio are used to judge the embedded skeleton of the optimized gradations. This method is used to evaluate whether the optimized gradation meets the requirements of the 3 proportional parameters of Bailey method,so as to strictly control the relation between the volume of asphalt mortar and the porosity of coarse aggregate to make the skeleton of asphalt mixture better and the performance more stable. In the course of the study,GTM method is adopted to formthe specimens,and the pavement performance of the asphalt mixture is verified by Marshall method. The result shows that( 1) The design of the coarse aggregate density between the apparent density and dry compacted density can achieve the embedded state. For the average dense graded asphalt mixture such as AK-13 A,apparent density is suitable for the design density of coarse aggregate,and dry packed density is suitable for SMA. The improved CAVF method is used to calculate the proportion of coarse and fine aggregates and optimize the gradation. The calculated asphalt-aggregate ratio is basically the same as the actual one. The 3 parameters of the coarse-type graded AK-13 A mixture are in accordance with the range of the Bailey method,forming a compact structure,while the 3 parameters of SMA are not in the range of Bailey method,and the skeleton structure is unique.( 2) The filler-asphalt ratio of SMA-13 is larger than that of AK-13 A,and the asphalt film thickness of SMA-13 is smaller than that of AK-13 A,but the road performance of the 2 mixtures is proved to be good by practice.
In traditional asphalt mixture gradation design,coarse,medium and fine aggregates are graded at first,and then the Marshall test pieces are compacted to analyse volume index and to determine gradation and asphalt-aggregate ratio. The process of is complex and the experiment has large human error and consumption of time and power. Based on selecting coarse aggregate density with Bailey method and calculating the ratios of coarse and fine aggregates as well as asphalt-aggregate ratio with CAVF method,the gradations and the asphalt-aggregate ratios of AK-13 A and SMA-13 are optimized. The proportional parameters of Bailey method including CA ratio,FAc ratio,and FAf ratio are used to judge the embedded skeleton of the optimized gradations. This method is used to evaluate whether the optimized gradation meets the requirements of the 3 proportional parameters of Bailey method,so as to strictly control the relation between the volume of asphalt mortar and the porosity of coarse aggregate to make the skeleton of asphalt mixture better and the performance more stable. In the course of the study,GTM method is adopted to formthe specimens,and the pavement performance of the asphalt mixture is verified by Marshall method. The result shows that( 1) The design of the coarse aggregate density between the apparent density and dry compacted density can achieve the embedded state. For the average dense graded asphalt mixture such as AK-13 A,apparent density is suitable for the design density of coarse aggregate,and dry packed density is suitable for SMA. The improved CAVF method is used to calculate the proportion of coarse and fine aggregates and optimize the gradation. The calculated asphalt-aggregate ratio is basically the same as the actual one. The 3 parameters of the coarse-type graded AK-13 A mixture are in accordance with the range of the Bailey method,forming a compact structure,while the 3 parameters of SMA are not in the range of Bailey method,and the skeleton structure is unique.( 2) The filler-asphalt ratio of SMA-13 is larger than that of AK-13 A,and the asphalt film thickness of SMA-13 is smaller than that of AK-13 A,but the road performance of the 2 mixtures is proved to be good by practice.
引文
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[8]JTG F40—2004,公路沥青路面施工技术规范[S].JTG F40—2004,Technical Specifications for Construction of Highway Asphalt Pavements[S].
[9]邱志雄.基于宏观轮廓的沥青路面抗滑性能试验研究[D].广州:华南理工大学,2014.QIU Zhi-xiong.Experimental Study of Anti-slide Performance of Asphalt Pavement Based on Macro Profile[D].Guangzhou:South China University of Technology,2014.
[10]肖鑫,张肖宁.基于CAVF法的排水沥青混合料组成设计[J].公路交通科技,2016,33(10):7-12.XIAO Xin,ZHANG Xiao-ning.Design of Porous Asphalt Mixture Based on CAVF Method[J].Journal of Highway and Transportation Research and Development,2016,33(10):7-12.
[11]JTG D50—2006,公路沥青路面设计规范[S].JTG D50—2006,Specifications for Design of Highway Asphalt Pavement[S].
[12]JTG E20—2011,公路工程沥青及沥青混合料试验规程[S].JTG E20—2011,Standard Test Methods of Bitumen and Bituminous Mixtures for Highway Engineering[S].
[13]葛折圣,夏辉.基于改进粗集料空隙填充法的密断级配沥青混合料设计[J].公路交通科技,2011,8(2):20-24.GE Zhe-sheng,XIA Hui.Designing of Dense Discontinuous Graded Asphalt Mixture Based on Improved Coarse Aggregate Void Filling Method[J].Journal of Highway and Transportation Research and Development,2011,8(2):20-24.
[14]李智,苏冠宇,孔翎旭.沥青玛蒂脂碎石混合料沥青路面抗滑性能设计与优化[J].科学技术与工程,2018,18(8):307-311.LI Zhi,SU Guan-yu,KONG Ling-xu.Design and Optimization of Stone Matrix Asphalt Mixture Asphalt Pavement Anti-slide Performance[J].Science Technology and Engineering,2018,18(8):307-311.
[15]褚付克,王笑风,郝孟辉,等.利用I法和贝雷法对间断级配废胎胶粉复合改性沥青混合料WRAC-13的优化设计[J].公路,2017(5):7-12.CHU Fu-ke,WANG Xiao-feng,HAO Meng-hui,et al.Optimization Design by I-method and Bailey Method of Discontinuous Gradation of Crumb Rubber Modified Asphalt Mixture WRAC-13[J].Highway,2017(5):7-12.
[16]郭寅川,申爱琴,李志远,等.基于贝雷法的SMA-13双指标控制配合比优化设计[J].公路,2014(1):187-191.GUO Yin-chuan,SHEN Ai-qin,LI Zhi-yuan,et al.Optimized Mix Design Using Dual Indexes Control for SMA-13 Based on Bailey Method[J].Highway,2014(1):187-191.
[17]李安,何昌轩,陈李峰.密级配沥青稳定碎石混合料性能研究[J].公路,2010(1):124-128.LI An,HE Chang-xuan,CHEN Li-feng.A Study on Performance of Dense Gradation Asphalt Treated Base Mixture[J].Highway,2010(1):124-128.
[18]王万平.抗车辙沥青混合料的试验研究[D].长沙:长沙理工大学,2010.WANG Wan-ping.Experimental Research on Rutting Resistance of Asphalt Mixture[D].Changsha:Changsha University of Science&Technology,2010.
[2]ASCHENBRENER T B,BONAQUIST R,HEJL F D.Bailey Method for Gradation Selection in Hot-mix Asphalt Mixture Design,No.E-C044[R].Washington,D.C.:Transportation Research Board,2002.
[3]VAVRIK W,PINE W,CARPENTER S.Aggregate Blending for Asphalt Mix Design:Bailey Method[J].Transportation Research Record,2002,1789(1):146-153.
[4]王艳丽.沥青混合料级配优化研究[D].西安:长安大学,2008.WANG Yan-li.Study on Asphalt Mixture Gradation Optimization[D].Xi'an:Chang'an University,2008.
[5]张肖宁,郭祖辛,吴旷怀.按体积法设计沥青混合料[J].哈尔滨建筑大学学报,1995,28(2):28-36.ZHANG Xiao-ning,GUO Zu-xin,WU Kuang-huai.Volume Method of Bituminous Mixture Design[J].Journal of Harbin University of Civil Engineering and Architecture,1995,28(2):28-36.
[6]张肖宁,王绍怀,吴旷怀,等.沥青混合料组成设计的CAVF法[J].公路,2001(12):17-21.ZHANG Xiao-ning,WANG Shao-huai,WU Kuang-huai,et al.CAVF Method for Asphalt Mixture Design[J].Highway,2001(12):17-21.
[7]葛折圣,张肖宁,高俊合.富沥青混合料设计方法的改进[J].公路交通科技,2007,24(11):49-50.GE Zhe-sheng,ZHANG Xiao-ning,GAO Jun-he.Improvement of FAC Designing Method[J].Journal of Highway and Transportation Research and Development,2007,24(11):49-50.
[8]JTG F40—2004,公路沥青路面施工技术规范[S].JTG F40—2004,Technical Specifications for Construction of Highway Asphalt Pavements[S].
[9]邱志雄.基于宏观轮廓的沥青路面抗滑性能试验研究[D].广州:华南理工大学,2014.QIU Zhi-xiong.Experimental Study of Anti-slide Performance of Asphalt Pavement Based on Macro Profile[D].Guangzhou:South China University of Technology,2014.
[10]肖鑫,张肖宁.基于CAVF法的排水沥青混合料组成设计[J].公路交通科技,2016,33(10):7-12.XIAO Xin,ZHANG Xiao-ning.Design of Porous Asphalt Mixture Based on CAVF Method[J].Journal of Highway and Transportation Research and Development,2016,33(10):7-12.
[11]JTG D50—2006,公路沥青路面设计规范[S].JTG D50—2006,Specifications for Design of Highway Asphalt Pavement[S].
[12]JTG E20—2011,公路工程沥青及沥青混合料试验规程[S].JTG E20—2011,Standard Test Methods of Bitumen and Bituminous Mixtures for Highway Engineering[S].
[13]葛折圣,夏辉.基于改进粗集料空隙填充法的密断级配沥青混合料设计[J].公路交通科技,2011,8(2):20-24.GE Zhe-sheng,XIA Hui.Designing of Dense Discontinuous Graded Asphalt Mixture Based on Improved Coarse Aggregate Void Filling Method[J].Journal of Highway and Transportation Research and Development,2011,8(2):20-24.
[14]李智,苏冠宇,孔翎旭.沥青玛蒂脂碎石混合料沥青路面抗滑性能设计与优化[J].科学技术与工程,2018,18(8):307-311.LI Zhi,SU Guan-yu,KONG Ling-xu.Design and Optimization of Stone Matrix Asphalt Mixture Asphalt Pavement Anti-slide Performance[J].Science Technology and Engineering,2018,18(8):307-311.
[15]褚付克,王笑风,郝孟辉,等.利用I法和贝雷法对间断级配废胎胶粉复合改性沥青混合料WRAC-13的优化设计[J].公路,2017(5):7-12.CHU Fu-ke,WANG Xiao-feng,HAO Meng-hui,et al.Optimization Design by I-method and Bailey Method of Discontinuous Gradation of Crumb Rubber Modified Asphalt Mixture WRAC-13[J].Highway,2017(5):7-12.
[16]郭寅川,申爱琴,李志远,等.基于贝雷法的SMA-13双指标控制配合比优化设计[J].公路,2014(1):187-191.GUO Yin-chuan,SHEN Ai-qin,LI Zhi-yuan,et al.Optimized Mix Design Using Dual Indexes Control for SMA-13 Based on Bailey Method[J].Highway,2014(1):187-191.
[17]李安,何昌轩,陈李峰.密级配沥青稳定碎石混合料性能研究[J].公路,2010(1):124-128.LI An,HE Chang-xuan,CHEN Li-feng.A Study on Performance of Dense Gradation Asphalt Treated Base Mixture[J].Highway,2010(1):124-128.
[18]王万平.抗车辙沥青混合料的试验研究[D].长沙:长沙理工大学,2010.WANG Wan-ping.Experimental Research on Rutting Resistance of Asphalt Mixture[D].Changsha:Changsha University of Science&Technology,2010.