Fan Taotao, Si Chundi, Zhang Yi, Zhu Yuefeng, Li Song
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 Jan 7;16(2):594. doi: 10.3390/ma16020594.
In order to improve the properties of calcium sulfate anhydrous whisker (ACSW) and polyester fiber composite reinforced asphalt mixture (ACPRA) to meet the service requirements of pavement materials in low-temperature environments, the central composite circumscribed design (CCC), a kind of response surface methodology, was chosen to optimize the design parameters. Three independence variables, asphalt aggregate ratio, ACSW content, and polyester fiber content were adopted to evaluate the design parameters. Four responsive variables, air voids, Marshall stability, splitting tensile strength, and failure tensile strain, were chosen to study the volumetric and mechanical characteristics, and the low-temperature behavior of ACPRA by the Marshall test and indirect tensile test at -10 °C. The results showed that, taking low-temperature behavior optimization as the objective, the CCC method was practicable to optimize design of ACPRA, and the optimization design parameters were asphalt aggregate ratio of 4.0%, ACSW content of 10.8%, and polyester fiber content of 0.4%. Furthermore, the impact of three independence variables interactions on four response variables was also discussed, and it was identified that the interaction between asphalt aggregate ratio and ACSW content, and between asphalt aggregate ratio and polyester fiber content, has greater bearing on the splitting tensile strength and failure tensile strain of APCRA. Meanwhile, ACSW and polyester fiber enhancing the low-temperature behavior of APCRA was primarily connected with their contents.
为了改善无水硫酸钙晶须（ACSW）与聚酯纤维复合增强沥青混合料（ACPRA）的性能，以满足低温环境下路面材料的使用要求，选用响应面法中的中心复合外切设计（CCC）来优化设计参数。采用沥青集料比、ACSW含量和聚酯纤维含量这三个自变量来评估设计参数。选取空隙率、马歇尔稳定度、劈裂抗拉强度和破坏拉伸应变这四个响应变量，通过马歇尔试验和-10℃下的间接拉伸试验来研究ACPRA的体积特性、力学特性及低温性能。结果表明，以低温性能优化为目标，CCC方法对ACPRA进行优化设计是可行的，优化后的设计参数为沥青集料比4.0%、ACSW含量10.8%、聚酯纤维含量0.4%。此外，还讨论了三个自变量的交互作用对四个响应变量的影响，结果表明沥青集料比与ACSW含量之间以及沥青集料比与聚酯纤维含量之间的交互作用对APCRA的劈裂抗拉强度和破坏拉伸应变影响较大。同时，ACSW和聚酯纤维对ACPRA低温性能的增强作用主要与其含量有关。
