塔里木大学学报2025，Vol.37Issue(3)：69-77,9.DOI:10.3969/j.issn.1009-0568.2025.03.009
干湿-盐冻融循环作用下棉花秸秆纤维沥青混合料水稳定性能试验研究
Experimental study on water stability of cotton straw fiber asphalt mixture under dry-wet-salt freeze-thaw cycle
摘要
Abstract
Southern Xinjiang is a key production region for high-quality cotton in China,with abundant reserves of cotton straw.To broaden the utilization pathways and scope of cotton straw,an indoor accelerated salt erosion dry wet salt freeze-thaw cycle test was independently designed.This test aimed to simulate the influence of cotton straw fibers on the water stability performance of AC-13 asphalt mixtures under the severe natural conditions in Southern Xinjiang.Basalt fiber asphalt mixtures were used as the control group,while common asphalt mixtures served as the blank group.The improvement mechanism of cotton straw fibers on the water stability performance of asphalt mixtures was investigated from a microscopic perspective by integrating electron microscopy scanning(SEM)and infrared spectroscopy techniques.The test results indicate that,under identical experimental conditions,both the void ratio and the freeze-thaw splitting strength ratio of the asphalt mixture exhibit a downward trend as the number of dry wet salt freeze-thaw cycles increases Under the same number of dry wet salt freeze-thaw cycles,basalt fibers demonstrated the most significant enhancement in the water stability performance of asphalt mixtures,followed by cotton straw fibers.However,the addition of cotton straw fibers significantly improved the mixture's resistance in the composite salt test environment.Microscopic analysis reveals that the phase change(liquid-solid)of the salt solution within the internal voids of the mixture,induced by the dry-wet-freeze-thaw cycles,punctures the asphalt film layer on the aggregate surface and simultaneously increases the internal voids of the mixture.This phenomenon is the primary cause of the decline in the water stability performance of the mixture.Meanwhile,the bridging and toughening effects of the fibers enhance the mixture's resistance to water damage.These findings elucidate the improvement effect of cotton straw fibers on the water stability performance of asphalt pavements under the natural environment of saline soil in southern Xinjiang,providing reference for promoting the application of cotton straw fiber in asphalt pavement in southern Xinjiang.关键词
沥青混合料/棉秸秆纤维/干湿-盐冻融循环/空隙率/冻融劈裂强度比Key words
asphalt mixtures/cotton straw fiber/dry wet salt freeze-thaw cycle/void ratio/freeze-thaw split strength ratio分类
交通运输引用本文复制引用
章蔚昊,张勤玲,赵一帆,朱鹏燕,付锐,王成华..干湿-盐冻融循环作用下棉花秸秆纤维沥青混合料水稳定性能试验研究[J].塔里木大学学报,2025,37(3):69-77,9.基金项目
国家自然科学基金地区科学基金项目(52068062) （52068062）
塔里木大学大学生创新创业训练计划项目(202310757038) （202310757038）
