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Predictive model of modified asphalt mixtures with nano hydrated lime to increase resistance to moisture and fatigue damages by the use of deicing agents
Construction and Building Materials ( IF 7.4 ) Pub Date : 2020-08-03 , DOI: 10.1016/j.conbuildmat.2020.120353
Hamid Behbahani , Gholam Hossein Hamedi , Vahid Najafi Moghaddam Gilani

Deicing agents are used to dissolving the frost on road surfaces in winter and cold areas. Researchers have evaluated the impact of different deicing agents on the moisture susceptibility performance of asphalt mixtures, but they have not investigated the effect of these agents on fatigue failure and thermodynamic parameters of asphalt mixtures. Therefore, in this research, by investigating the effect of two new deicing agents of calcium magnesium acetate (CMA) and potassium acetate (PA) as well as sodium chloride (NaCl) traditional agent on moisture and fatigue performances of asphalt mixtures, predictive model of the tensile strength ratio (TSR) and the fatigue life ratio (NFR) using genetic programming (GP) based on the surface free energy (SFE) components and other properties of asphalt mixtures were presented. Nano hydrated lime (NHL) was applied as an asphalt binder modifier and an anti-stripping agent to improve the strength of asphalt mixtures. The results indicated that the saturated mixtures in CMA had the highest indirect tensile strength (ITS) and fatigue life in lower freeze-thaw cycles, while the NaCl-saturated samples had more ITS and fatigue life in higher cycles. The CMA-saturated samples had the greatest TSR and NFR. Using NHL in all saturated samples resulted in increasing TSR and NFR values. Results of SFE method showed that using NHL increased the polar, non-polar and basic components of asphalt binders and decreased their acidic components. Also, using NHL increased the total SFE amount of asphalt binder, enhancing the adhesion of aggregate and asphalt binder and cohesion in asphalt binder membrane, and as a result, improving the moisture resistance in asphalt mixtures. Using 1.5% NHL had the greatest effect on improving adhesion free energy (AFE), cohesion free energy (CFE) and detachment energy (DE). Among deicing solutions, CMA had the highest CFE, in general, and NaCl had the best DE values. PA-saturated samples had the greatest permeability of asphalt mixture (PAM) values. GP model had a high R2 96.4% and 98.3% for TSR and NFR, respectively. Using GP model to achieve the maximum TSR and NFR, the Pareto curve showed that 1.32% NHL was the optimum value for simultaneously increasing moisture resistance and fatigue life.



中文翻译:

改性沥青混合料与纳米熟石灰的预测模型,可通过使用除冰剂提高耐湿性和抗疲劳损伤能力

除冰剂用于溶解冬季和寒冷地区路面上的霜。研究人员已经评估了各种除冰剂对沥青混合料的湿气敏感性性能的影响,但他们尚未研究这些除冰剂对沥青混合料的疲劳破坏和热力学参数的影响。因此,在这项研究中,通过研究两种新的醋酸钙镁(CMA)和醋酸钾(PA)除冰剂以及氯化钠(NaCl)传统除冰剂对沥青混合料的水分和疲劳性能的影响,预测模型提出了基于表面自由能(SFE)成分和沥青混合料其他性能的基于遗传规划(GP)的抗张强度比(TSR)和疲劳寿命比(NFR)。纳米熟石灰(NHL)被用作沥青粘合剂改性剂和抗剥离剂,以提高沥青混合物的强度。结果表明,在较低的冻融循环中,CMA中的饱和混合物具有最高的间接拉伸强度(ITS)和疲劳寿命,而在较高的循环中,NaCl饱和的样品具有较高的ITS和疲劳寿命。CMA饱和的样品具有最大的TSR和NFR。在所有饱和样品中使用NHL会导致TSR和NFR值增加。SFE方法的结果表明,使用NHL可以增加沥青粘合剂的极性,非极性和碱性成分,并降低其酸性成分。另外,使用NHL可以增加沥青粘合剂的总SFE量,增强集料和沥青粘合剂的粘合力以及沥青粘合剂膜的内聚力,因此,改善沥青混合料的耐湿性。使用1.5%的NHL对改善粘着自由能(AFE),内聚自由能(CFE)和脱离能(DE)的影响最大。通常,在除冰解决方案中,CMA的CFE最高,而NaCl的DE值最高。PA饱和的样品具有最大的沥青混合料渗透率(PAM)值。GP模型的R高2 TSR和NFR分别为96.4%和98.3%。使用GP模型获得最大的TSR和NFR,帕累托曲线显示1.32%的NHL是同时增加耐湿性和疲劳寿命的最佳值。

更新日期:2020-08-04
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