改善水泥稳定碎石混合料收缩性能的试验研究
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摘要
水泥稳定碎石具有强度高、稳定性好、抗冲刷性能及抗行车疲劳性能较好的特点,但它在湿度变化(水分蒸发)时易产生干缩裂缝,导致沥青面层表面形成反射裂缝,进而影响路面的使用性能和使用寿命,这一缺陷是很明显的。且随着我国交通状况的变化,半刚性基层沥青路面遭遇到重载交通和早期损坏两大挑战,因此,提出能适应重载交通的长寿命优性能半刚性基层沥青混凝土路面设计方法,对目前重载交通高速公路的半刚性路面工程建设和养护将具有重大的经济效益和社会意义,同时对低等级公路沥青路面、城市道路沥青路面和机场跑道沥青路面的建设与养护也具有指导和参考价值。为此,本文分以下几个步骤进行了研究:
首先,定出所要研究的级配以及水泥用量,然后通过对掺加不同掺量膨胀剂、减缩剂的混合料进行击实试验结果,得出各掺量混合料的最佳含水量和最大干密度。与此同时,对掺与不掺外加剂的混合料做延迟时间击实试验,把其对混合料的影响做一个综合分析,得出延迟时间对掺外加剂混合料的影响结论。
然后,通过对掺加不同掺量膨胀剂、减缩剂的水泥稳定碎石混合料进行抗压强度、劈裂强度、劈裂模量以及干缩试验,选取梁亚军推荐的干缩抗裂系数来评价其抗裂性能,再结合抗压强度对其进行综合比较,得出最佳膨胀剂和减缩剂掺量。
最后,以此最佳外加剂掺量混合料与未掺外加剂混合料的路用性能做出综合分析,得出掺外加剂能有效改善水泥稳定碎石收缩性能的结论。
Cement stabilized gravel has high strength, good stability, anti-erosion properties and better anti-fatigue property, but it is easy to produce desiccation cracks when humidity changes (caused by evaporation), resulting in reflection crack on the bituminous pavement surface, then influences performance and the service life of the pavement. This flaw is very obvious. And along with changes in traffic conditions, semi-rigid asphalt pavement encounters two big challenges heavy load transportation and the early damage. Therefore, it will have the significant economic efficiency and the social meaning to the present construction and the maintenance of the semi-rigid highway pavement surface to propose a long life semi-rigid asphalt concrete pavement design method which is adapt to the heavy-duty traffic. It will also have instruction and reference value to the low grade road bituminous pavement, the urban road bituminous pavement and the runway bituminous pavement's construction and the maintenance. Therefore, this article has conducted the research with following several steps:
Firstly, the study set out to determine the grade and cement consumption, and then get the best amount of moisture and maximum dry density according to the compaction test results of different mixtures with different contents of expansive agent and shrinkage reducing admixture. Meanwhile, makes a generalized analysis of the admixture impact to the mixture by performing the delay time compaction test and gets a conclusion about the impact of delay time to the mixture.
And then ,through the compressive strength, the cleavage strength, the cleavage module as well as the air shrinkage experiment on the cement stabilized mixture with different contents, appraises its crack resistance performance by selecting the shrinkage anti-crack coefficient recommended by Yajun Liang then gets the best contents of expansive agent and shrinkage reducing admixture by recombining with compressive strength.
Finally, makes a generalized analysis about pavement performances of mixture with best amount of admixture and mixture without admixture then gets a conclusion about the effects of improving shrinkage performance of cement stabilized mixture by adding admixture.
首先,定出所要研究的级配以及水泥用量,然后通过对掺加不同掺量膨胀剂、减缩剂的混合料进行击实试验结果,得出各掺量混合料的最佳含水量和最大干密度。与此同时,对掺与不掺外加剂的混合料做延迟时间击实试验,把其对混合料的影响做一个综合分析,得出延迟时间对掺外加剂混合料的影响结论。
然后,通过对掺加不同掺量膨胀剂、减缩剂的水泥稳定碎石混合料进行抗压强度、劈裂强度、劈裂模量以及干缩试验,选取梁亚军推荐的干缩抗裂系数来评价其抗裂性能,再结合抗压强度对其进行综合比较,得出最佳膨胀剂和减缩剂掺量。
最后,以此最佳外加剂掺量混合料与未掺外加剂混合料的路用性能做出综合分析,得出掺外加剂能有效改善水泥稳定碎石收缩性能的结论。
Cement stabilized gravel has high strength, good stability, anti-erosion properties and better anti-fatigue property, but it is easy to produce desiccation cracks when humidity changes (caused by evaporation), resulting in reflection crack on the bituminous pavement surface, then influences performance and the service life of the pavement. This flaw is very obvious. And along with changes in traffic conditions, semi-rigid asphalt pavement encounters two big challenges heavy load transportation and the early damage. Therefore, it will have the significant economic efficiency and the social meaning to the present construction and the maintenance of the semi-rigid highway pavement surface to propose a long life semi-rigid asphalt concrete pavement design method which is adapt to the heavy-duty traffic. It will also have instruction and reference value to the low grade road bituminous pavement, the urban road bituminous pavement and the runway bituminous pavement's construction and the maintenance. Therefore, this article has conducted the research with following several steps:
Firstly, the study set out to determine the grade and cement consumption, and then get the best amount of moisture and maximum dry density according to the compaction test results of different mixtures with different contents of expansive agent and shrinkage reducing admixture. Meanwhile, makes a generalized analysis of the admixture impact to the mixture by performing the delay time compaction test and gets a conclusion about the impact of delay time to the mixture.
And then ,through the compressive strength, the cleavage strength, the cleavage module as well as the air shrinkage experiment on the cement stabilized mixture with different contents, appraises its crack resistance performance by selecting the shrinkage anti-crack coefficient recommended by Yajun Liang then gets the best contents of expansive agent and shrinkage reducing admixture by recombining with compressive strength.
Finally, makes a generalized analysis about pavement performances of mixture with best amount of admixture and mixture without admixture then gets a conclusion about the effects of improving shrinkage performance of cement stabilized mixture by adding admixture.
引文
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[2]黄煜镔,水泥稳定碎石基层沥青路面裂缝防治研究[D],上海:同济大学,2004.
[3]张晓冰,半刚性基层沥青路面裂缝出现原因分析及防治措施[J],河南交通科技,1999,2:13-14.
[4]焦新海,周行春.半刚性路面反射裂缝防治措施研究综述[J],重庆交通学院学报,1998,17(1):52-57.
[5]陈兴伟,重载耐久性沥青路面结构设计研究[D],上海:同济大学,2005。
[6]同济大学道路与交通工程研究所等,半刚性基层沥青路面[M],北京:人民交通出版1991.
[7]周富杰,防治反射裂缝的措施及其分析[D],上海:同济大学,1998.
[8]廖公云,水泥稳定粒料收缩特性研究[D],南京:东南大学交通学院
[9]杨成忠,陈万翔,基于半刚性基层的沥青路面反射裂缝分析与防治[J],公路,2002,No.4:65-89.
[10]张登良,郑南翔,半刚性基层材料收缩抗裂性能研究[J],中国公路学报,1991,Vol.4,No.1:16-22.
[11]梁亚军,水泥稳定碎石混合料组成设计初步研究[D],上海:同济大学,2006。
[12]沙庆林,高速公路沥青路面早期破坏现象及预防[M],北京:人民交通出版社,1991.
[13]公路工程水泥及水泥混凝土设计规程(JTG E30-2005).人民交通出版社
[14]鹿中山,杨树萍,张颖如,水泥稳定砂砾基层产生裂缝的原因与防治措施[J],合肥工业大学学报,2001,vol.24(5):963-966.
[15]Tighe,Susan;Haas,Ralph;Ponniah,Joseph.Life-Cycle Cost Analysis of Mitigating Reflective Cracking[J],Transportation Research Record,2003,No.1823:73-79
[16]Brown,Norman R.Solution for Distressed Pavements and Crack Reflection[A],Eight International Conference on Low-Volume Roads 2003[C],USA:National Research Council,2003,No.1819:313-317.
[17]Caltabiano,M.A.:Brunton,J.M.Reflection cracking in asphalt overlays[A],Asphalt Paving Technology:Proceedings-Association of Asphalt Paving Technical Sessions[C],USA:Assoe of Asphalt Paving Technologists,1991,Vol.60:310-312.
[18]Brown,S.F.;Thom,N.H;Sanders,F.J.A study of grid reinforced asphalt to combat reflecting cracking[A],Asphalt Paving Technology:Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions[C],Association of Asphalt Paving Technologist,2002,Vol.70:543-571.
[19]Jiang,Yi;McDaniel,Rebecca S.Application of cracking and seating and use of fibers to control reflective cracking[R],Transportation Research Record,1993,NO.1388:150-159.
[20]David W.Pittman,George E Ramey,Greg Webster.Laboratory evaluation of concrete mixture designs employing type Ⅰ and type K cement.Journal of materials in civil engineering,1999,144-150.
[21]Dave Flax.Changing cement mix eliminates parking garage cracks.Concrete Monthly,1,2006.
[22]梅传江,牛朋,水泥稳定碎石基层路用性能研究[J],公路交通科技,2002,Vol.3(3):35-37.
[23]潘兆平,黄晓明,水泥稳定碎石路面基层材料水泥剂量范围试验[J],南京建筑工程学院学报,1998,No.47:21-26.
[24]孟书涛,水泥稳定碎石材料的合理应用[J],公路交通科技,2004,No5.
[25]曹建新,级配碎石混合料组成设的试验研究[J],公路,2004,No2.
[26]孙立军,沥青路面行为理论、2003.5.
[27]周俊龙.膨胀剂对混凝土性能的影响[D].重庆大学,2004.
[28]安明喆,刘英利.混凝土膨胀剂的研究与应用[J].建筑技术开发,2001
[29]JC476-2001,混凝土膨胀剂[S].
[30]吴中伟,张鸿直.膨胀混凝土.中国铁道出版社,1990.
[31]杨红辉.掺膨胀剂及纤维水泥稳定碎石抗裂性能研究[D].长安大学,2003.
[32]陈冬燕,王选仓,薛彦平.掺膨胀剂水泥稳定碎石抗裂性能研究[J].河北交通科技,2005.
[33]陈冬燕.半刚性基层材料抗裂性能研究[D].长安大学,2005.
[34]江臣,刘发,赵永利.膨胀剂对水泥稳定碎石基层干缩性能的影响[J].公路,2005.
[35]一种减少混凝土收缩率的外加剂[J].建筑技术开发,2000.
[36]杨跃波.减缩剂对高性能混凝土早期变形性能的影响[D].哈尔滨工业大学,2005.
[37]韩建国,杨富民.混凝土减缩剂的作用机理及其应用效果[J].混凝土,2001.
[38]钱晓倩,詹树林,方明晖.减缩剂与减水剂的相容性研究[J].浙江大学学报(工学版),2005,39(1):76-81.
[39]钟卫华,陆采荣.减缩剂对水泥基材料收缩性能的影响[J].山西建筑,2005.
[40]韩建国,阎培渝.减缩剂对混凝土体积稳定性和力学性能的影响[J].生态环境与混凝土技术国际学术研讨会,2005.
[41]韩建国,阎培渝.混凝土减缩剂的开发及应用效果[J].高强与高性能混凝土及其应用专题研讨会论文集,2005.
[42]李悦等.新型混凝土减缩剂的研究(Ⅰ)—水泥胶砂试验[J].武汉理工大学学报,2003.
[43]邵正明等.JSJ减缩剂的性能研究与工程应用[J].混凝土,2003.
[44]钟卫华陆采荣.减缩剂对碾压混凝土的减缩作用研究[J].水利水运工程学报,2005.
[45]卞荣兵等.新型混凝土减缩剂评价研究[J].建筑材料学报,2005.
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