盐冻循环对SBS改性沥青混合料低温弯曲蠕变性能的影响
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摘要
在室内盐冻循环基础上,通过低温小梁弯曲蠕变试验分析了不同盐冻环境对沥青混合料低温弯曲蠕变性能的影响;同时采用灰色关联熵分析法对不同盐冻环境下小梁弯曲蠕变差异进行比较;引入扫描电子显微镜从微观层面分析冻融前后混合料试样的微观结构变化。通过宏微观相结合的手段发现:低温下沥青混合料变形性能受冻融循环影响显著,其中破坏程度以水冻融最为严重。盐冻循环各组对于沥青混合料的破坏程度由于受多个因素影响各有差异但在冰冻温度为-20℃、盐溶液浓度为4%和冻融循环次数为15次环境下沥青混合料的低温变形能力相对较好。
Basedon the freeze-thaw cycletest of laboratory,the trabecular bending creep test was conductedin this article to analyse the influence that salt freeze-thaw cycles had on bending creep properties of SBS( styrene-butadiene-styrene block copolymer) modified asphalt mixture at low temperature. At the same time,the analysis of grey entropy was used to compare the trabecular bending creep differencesunder different salt freezing conditions. Scanning electron microscopy( SEM) was also used to study the microstructure of asphalt mixture specimensbefore and after freeze-thaw cycles. Through the combination of macro and micro methods,it is observed thatthe effect of freeze-thaw cycles on the low temperature deformation performance of asphalt mixture is remarkable and the failure degree is most serious with water freeze and thaw. The failure degree that different freeze-thaw cycles environments have on asphalt mixture varies in multiple factors. When the freezing temperature is at-20 degree,the concentration of salt solution is 4% and the number of freeze-thaw cycles is 15 times,the low temperature deformation ability of asphalt mixture is relatively good.
Basedon the freeze-thaw cycletest of laboratory,the trabecular bending creep test was conductedin this article to analyse the influence that salt freeze-thaw cycles had on bending creep properties of SBS( styrene-butadiene-styrene block copolymer) modified asphalt mixture at low temperature. At the same time,the analysis of grey entropy was used to compare the trabecular bending creep differencesunder different salt freezing conditions. Scanning electron microscopy( SEM) was also used to study the microstructure of asphalt mixture specimensbefore and after freeze-thaw cycles. Through the combination of macro and micro methods,it is observed thatthe effect of freeze-thaw cycles on the low temperature deformation performance of asphalt mixture is remarkable and the failure degree is most serious with water freeze and thaw. The failure degree that different freeze-thaw cycles environments have on asphalt mixture varies in multiple factors. When the freezing temperature is at-20 degree,the concentration of salt solution is 4% and the number of freeze-thaw cycles is 15 times,the low temperature deformation ability of asphalt mixture is relatively good.
引文
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[10]司伟,马骉,汪海年,等.沥青混合料在冻融循环作用下的弯拉特性[J].吉林大学学报(工),2013,43(4):885-890.
[11]张倩,李泽,温志广,等.考虑荷载作用的沥青混合料冻融损伤特性研究[J].冰川冻土,2017,39(2):358-365.
[12] Islam M R,Tarefder R A. Coefficients of Thermal Contraction and Expansion of Asphalt Concrete in the Laboratory[J]. Journal of Materials in Civil Engineering,2015,27(11):04015020.
[13]李秀君,张永平,许光孝,等.基于灰熵关联法的泡沫沥青二次冷再生混合料粗集料矿料间隙率影响因素分析[J].水资源与水工程学报. 2016,27(5):180-184.
[14] Hu,S.,Zhang Bixi,Guan Yingying. Profit Allocation about the Four-level Supply Chain Based on the Shapley Value[J]. Systems Engineering. 2009,09.
[15]刘亚敏,韩森,李波.基于表面能理论的沥青与矿料粘附性研究[J].建筑材料学报,2010,13(6):769-772.
[2] Dai Q,Sadd M H,You Z. A micromechanical finite element model for linear and damage-coupled viscoelastic behaviour of asphalt mixture[J]. International Journal for Numerical&Analytical Methods in Geomechanics,2006,30(11):1135-1158.
[3] You Z,Buttlar W G. Discrete Element Modeling to Predict the Modulus of Asphalt Concrete Mixtures[J]. Journal of Materials in Civil Engineering,2004,16(2):140-146.
[4]白桃,胡小弟.集料复配情况下沥青混合料小梁弯曲试验研究[J].华中科技大学学报(自然科学版),2017(8):105-109.
[5]孙雅珍,朱传江,吴刚兵,等.高粘弹沥青砂的粘弹性模型参数研究[J].中外公路,2015,35(4):244-247.
[6] JTG E30-2005,公路工程水泥及水泥混凝土试验规程[S].
[7]冯蕾,王乐,崔亚楠,等.盐冻循环对胶粉改性沥青混合料性能的影响[J].公路工程,2014,39(4):117-123.
[8]韩吉伟,崔亚楠,王乐,等.盐冻循环条件下SBS改性沥青砂浆的力学性能分析[J].功能材料. 2015,46(12):12141-12145.
[9]叶永,杨新华,陈传尧.在不同应力水平下沥青砂蠕变模型实验对比[J].华中科技大学学报(自然科学版),2009(3):116-118.
[10]司伟,马骉,汪海年,等.沥青混合料在冻融循环作用下的弯拉特性[J].吉林大学学报(工),2013,43(4):885-890.
[11]张倩,李泽,温志广,等.考虑荷载作用的沥青混合料冻融损伤特性研究[J].冰川冻土,2017,39(2):358-365.
[12] Islam M R,Tarefder R A. Coefficients of Thermal Contraction and Expansion of Asphalt Concrete in the Laboratory[J]. Journal of Materials in Civil Engineering,2015,27(11):04015020.
[13]李秀君,张永平,许光孝,等.基于灰熵关联法的泡沫沥青二次冷再生混合料粗集料矿料间隙率影响因素分析[J].水资源与水工程学报. 2016,27(5):180-184.
[14] Hu,S.,Zhang Bixi,Guan Yingying. Profit Allocation about the Four-level Supply Chain Based on the Shapley Value[J]. Systems Engineering. 2009,09.
[15]刘亚敏,韩森,李波.基于表面能理论的沥青与矿料粘附性研究[J].建筑材料学报,2010,13(6):769-772.