KH-560处理时间对PAN基碳纤维沥青复合材料性能的影响  

Effect of KH-560 treatment time on the properties ofPAN based carbon fiber asphalt composites

作　　者：曹国斌 张燕[2] CAO Guobin;ZHANG Yan(Gansu Road and Bridge Construction Group Limited,Lanzhou 730000,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]甘肃路桥建设集团有限公司,兰州730000 [2]兰州交通大学土木工程学院,兰州730070

出　　处：《功能材料》2024年第4期4223-4229,共7页Journal of Functional Materials

基　　金：国家自然科学基金项目(81363255);甘肃省交通建设科技项目(2010-12)。

摘　　要：以硅烷偶联剂KH-560改性的PAN基碳纤维为添加材料,制备了不同KH-560处理时间的PAN基碳纤维沥青复合材料。通过车辙试验、冻融劈裂试验和间接拉伸疲劳试验等研究了KH-560处理时间对沥青复合材料高温稳定性、低温抗裂性、水稳定性、疲劳性能和吸声性能的影响。结果表明,经过KH-560处理后的PAN基碳纤维表面的粗糙度增加,当KH-560处理时间为2 h时,纤维凹槽较深,与沥青的作用面积增大,纤维在复合材料中形成了致密网状结构,增强了PAN基碳纤维复合材料的稳定性。当KH-560处理时间为2 h时,PAN基碳纤维沥青复合材料的高温性能、低温抗裂性能、水稳定性和疲劳性能均最佳,此时其45和60 min的变形量、破坏劲度模量达到最小值,分别为1.851和2.117 mm、2 201 MPa;动稳定度、劈裂抗拉强度和破坏拉伸应变达到最大值,分别为3 077次/mm、4.6 MPa和3479με。在250~1 000 Hz和1 000~1 600 Hz范围内,当KH-560处理时间为2 h时,沥青复合材料的平均吸声系数均达到最大值,分别为0.116和0.127,较未处理的沥青复合材料分别提高了39.76%和45.98%,吸声降噪性能提升显著。综上可知,KH-560的最佳处理时间为2 h。PAN based carbon fiber asphalt composites with different KH-560 treatment times were prepared using PAN based carbon fibers modified with silane coupling agent KH-560 as the additive material.The effects of KH-560 treatment time on the high-temperature stability,low-temperature crack resistance,water stability,fatigue performance and sound absorption performance of asphalt composite materials were studied through rutting tests,freeze-thaw splitting tests and indirect tensile fatigue tests.The results showed that the surface roughness of PAN based carbon fibers treated with KH-560 increased,when the KH-560 treatment time was 2 h,the fiber grooves were deeper,and the interaction area with asphalt increased.The fibers formed a dense network structure in the composite material,enhancing the stability of PAN based carbon fiber composites.When the KH-560 treatment time was 2 h,the high temperature performance,low temperature crack resistance,water stability,and fatigue performance of PAN based carbon fiber asphalt composite material were all the best.At this point,its deformation and failure stiffness modulus at 45 and 60 min reached the minimum values,which were 1.851 and 2.117 mm,2201 MPa,respectively.The maximum values of dynamic stability,splitting tensile strength,and failure tensile strain were 3077 times/mm,4.6 MPa,and 3479με,respectively.In the range of 250-1000 Hz and 1000-1600 Hz,when the KH-560 treatment time was 2 h,the average sound absorption coefficients of the asphalt composite material reached their maximum values,which were 0.116 and 0.127,respectively,which were 39.76%and 45.98%higher than the untreated asphalt composite material,respectively.The sound absorption and noise reduction performance was significantly improved.In summary,the optimal processing time for KH-560 is 2 h.

关 键 词：KH-560处理 PAN基碳纤维 沥青 复合材料 疲劳性能 吸声性能 

分 类 号：U414[交通运输工程—道路与铁道工程]