66魏志学单掺及复掺纤维的高模量沥青混合料路用性能研究作者简介：魏志学，高级工程师，硕士，研究方向：沥青路面再生材料的路用性能、公路工程试验检测质量管理。单掺及复掺纤维的高模量沥青混合料路用性能研究魏志学（河南璟信工程监理有限公司，河南洛阳471000）摘要：为评价单掺及复掺纤维对BRA改性高模量沥青混合料性能的增强作用，采用半圆针入度试验、直接拉伸试验研究了纤维对高模量沥青柔韧性和剪切性能的影响，基于车辙试验、贯入剪切试验、低温弯曲试验评价了纤维高模量沥青混合料的各项性能。结果表明：单掺及复掺纤维均能显著提高BRA高模量沥青的蠕变柔量和抗剪切强度；纤维的微观形貌差异导致其对高模量沥青及其混合料性能改善效果各有侧重，采用复掺纤维方案可实现不同纤维对BRA改性沥青性能改善效果的叠加作用；复掺纤维对高模量沥青混合料的低温抗裂性能、长期高温稳定性等各项路用性能有较大提升并且效果更加均衡，有较好的技术优越性。关键词：高模量沥青混合料；复掺纤维；柔韧性；路用性能中图分类号：U416；U414StudyonRoadPerformanceofHighModulusAsphaltMixturewithSingleandCompositeFiberWEIZhi-xue(HenanJingxinEngineeringSupervisionCo.,Ltd.,Luoyang471000,Henan,China)Abstract：InordertoevaluatethestrengtheningeffectofsingleandcompoundfiberontheperformanceofBRAmodifiedhighmodulusasphaltmixture,thesemicirclepenetrationtestanddirecttensiletestwereusedtostudytheinfluenceoffiberontheflexibilityandshearperformanceofhighmodulusasphaltmixture,andtheperformanceoffiberhighmodulusasphaltmixturewasevaluatedbasedonruttingtest,penetrationsheartestandlow-temperaturebendingtest.TheresultsshowthatthecreepcomplianceandshearstrengthofBRAhighmodulusasphaltcanbesignificantlyimprovedbyaddingfiberaloneorincombination.Thedifferenceofmicromorphologyoffibersleadstoacertainemphasisontheperformanceimprovementofhighmodulusasphaltanditsmixture.Thecompositefibercangreatlyimprovethelowtemperaturecrackresistance,long-termhightemperaturestabilityandotherroadperformanceofhighmodulusasphaltmixture,andtheeffectismorebalanced,withbettertechnicaladvantages.Keywords：highmodulusasphaltmixture;compositefiber;flexibility;roadperformance按照法国规范NFP98140，高模...
