盐冻融循环对玄武岩纤维沥青混合料抗裂性能及微观结构的影响  

Effect of Salt Freeze-Thaw Cycle on Crack Resistance and Microstructure of Basalt Fiber Asphalt Mixture

作　　者：姚华彦[1,2] 王旭洋 拓明阳 孙磊 扈惠敏 YAO Huayan;WANG Xuyang;TA Mingyang;SUN Lei;HU Huimin(School of Civil Engineering,Hefei University of Technology,Hefei,230009,China;School of Civil Engineering,North Minzu University,Yinchuan 750021,China;Anhui Transportation Holding Group Co.,Ltd.,Hefei 230088,China)

机构地区：[1]合肥工业大学土木与水利工程学院,合肥230009 [2]北方民族大学土木工程学院,银川750021 [3]安徽省交通控股集团有限公司,合肥230088

出　　处：《材料导报》2024年第S02期630-635,共6页Materials Reports

摘　　要：针对玄武岩纤维沥青混合料开展半圆弯拉试验(SCB)和核磁共振试验(NMR),研究盐冻融循环作用下玄武岩纤维对沥青混合料抗裂性能的影响。结果表明:冻融循环会降低沥青混合料的抗裂性能,氯盐会加速混合料的性能劣化。玄武岩纤维的掺入可以提升沥青混合料的抗裂性能,盐溶液冻融循环20次后,相较于未掺纤维沥青混合料,玄武岩纤维沥青混合料试样的断裂韧度和断裂能高出47.5%和40.1%。核磁共振结果显示,随着冻融循环次数的增加,沥青混合料中小孔隙劣化转变为大孔隙,这是沥青混合料抗裂性能下降的主要原因。玄武岩纤维可以发挥增韧阻裂作用,阻碍小孔隙的劣化从而抑制大孔隙的形成,增强了沥青混合料的抗裂性能。SCB and NMR tests were carried out to study the effect of asphalt fiber on crack resistance of asphalt mixture under freezing and thawing cycle of salt.The results show that the freeze-thaw cycle can reduce the crack resistance of asphalt mixture,and the chlorine salt can accelerate the deterioration of asphalt mixture.The addition of basalt fiber can improve the crack resistance of asphalt mixture.After 20 freezing-thawing cycles of salt solution,the fracture toughness and fracture energy of basalt fiber asphalt mixture are 47.5%and 40.1%higher than that of unblended asphalt mixture.The NMR results show that with the increase of freeze-thaw cycles,the small and medium pores of asphalt mixture deteriorate into large pores,which is the main reason for the decrease of crack resistance of asphalt mixture.Basalt fiber can play the role of toughening and crack resistance,hinder the deterioration of small pores and inhibit the formation of large pores,and enhance the crack resistance of asphalt mixture.

关 键 词：沥青混合料 玄武岩纤维 半圆弯拉试验(SCB) 抗裂性能 核磁共振(NMR) 

分 类 号：U414[交通运输工程—道路与铁道工程]