Fan Taotao, Song Qiuping, Si Chundi, Han Songkai
School of Traffic and Transportation, Shijiazhuang Tiedao University, Shijiazhuang 050043, China.
State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China.
Materials (Basel). 2023 Oct 12;16(20):6662. doi: 10.3390/ma16206662.
In hot and humid climates, asphalt pavements frequently encounter environmental factors such as elevated temperatures and rainfall, leading to rutting deformations and potholes, which can affect pavement performance. The primary objective of this study was to enhance the hydrothermal characteristics of asphalt mixtures through an investigation into the impact of anhydrous calcium sulfate whisker (ACSW) and polyester fiber (PF) on the hydrothermal properties of asphalt mixtures. In this paper, a central composite concatenation design (CCC) was employed to determine the optimal combination of ACSW and PF contents, as well as the asphalt aggregate ratio (AAR). Each influencing factor was assigned three levels for analysis. The evaluation indexes included dynamic stability, retained Marshall stability, and tensile strength ratio. Using the analysis methods of variance and gray correlation degree analysis, the hydrothermal properties of the asphalt mixture were examined in relation to the contents of ACSW, PF, and AAR based on the CCC results. Consequently, the optimal mix design parameters for composite modified asphalt mixture incorporating ACSW and PF were determined. The results indicated that the asphalt mixtures with hydrothermal qualities exhibited optimal performance in terms of 4.1% ARR, 11.84% ACSW, and 0.4% PF. The interaction between AAR and ACSW content had a greater effect on the dynamic stability and tensile strength ratio of the asphalt mixture, whereas the incorporation of ACSW and PF had a greater effect on the retained Marshall stability of the asphalt mixture. Among the three contributing factors, AAR exhibited the strongest relationship with the hydrothermal characteristics of the asphalt mixture, followed by the ACSW content; the correlation of PF content was the lowest. Therefore, to enhance the hydrothermal characteristics of the asphalt mixture, it is important to conduct a full evaluation of the constituents of ACSW and PF, along with the AAR in hot-humid regions.
在炎热潮湿的气候条件下，沥青路面经常会遇到高温和降雨等环境因素，从而导致车辙变形和坑洼，影响路面性能。本研究的主要目的是通过研究无水硫酸钙晶须（ACSW）和聚酯纤维（PF）对沥青混合料水热性能的影响，来提高沥青混合料的水热特性。本文采用中心复合串联设计（CCC）来确定ACSW和PF含量以及沥青集料比（AAR）的最佳组合。每个影响因素都设定了三个水平进行分析。评价指标包括动稳定度、残留马歇尔稳定度和抗拉强度比。基于CCC结果，运用方差分析和灰色关联度分析方法，研究了沥青混合料的水热性能与ACSW、PF含量及AAR之间的关系。从而确定了掺入ACSW和PF的复合改性沥青混合料的最佳配合比设计参数。结果表明，具有水热特性的沥青混合料在4.1%的AAR、11.84%的ACSW和0.4%的PF时表现出最佳性能。AAR与ACSW含量之间的相互作用对沥青混合料的动稳定度和抗拉强度比影响较大，而掺入ACSW和PF对沥青混合料的残留马歇尔稳定度影响较大。在这三个影响因素中，AAR与沥青混合料水热特性的关系最为密切，其次是ACSW含量；PF含量的相关性最低。因此，为提高沥青混合料的水热特性，在湿热地区对ACSW、PF的成分以及AAR进行全面评估很重要。
