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作为一种潜在、可利用的天然植物纤维,棉秸秆纤维应用于沥青路面中具有一定的现实意义。在了解棉秸秆纤维基本技术性能的基础上,进行掺棉秸秆纤维的AC-13和SMA-13沥青混合料配合比设计,通过高温车辙试验、低温弯曲试验、浸水马歇尔试验及冻融劈裂试验研究其混合料的高温稳定性、低温抗裂性及水稳定性,并与木质素纤维沥青混合料进行对比。结果表明:棉秸秆纤维能显著改善沥青混合料的高温稳定性及低温抗裂性,与未掺纤维混合料相比,动稳定度约提高30%,低温破坏应变约提高20%,水稳定性有所提高;棉秸秆纤维沥青混合料与木质素纤维沥青混合料基本路用性能接近,最佳沥青用量略低于木质素纤维沥青混合料。研究结论可为棉秸秆纤维在沥青路面中的应用提供参考。
As a potential and available natural plant fiber, the application of cotton straw fiber in asphalt pavement has certain practical significance. On the basis of understanding the basic technical performance of cotton stalk fiber, the mix design of AC-13 and SMA-13 bituminous mixture with straw fiber was carried out. Through high-temperature rutting test, low temperature bending test, immersion Marshall test and freeze-thaw splitting test The high temperature stability, low temperature crack resistance and water stability of the mixture were studied and compared with lignin fiber asphalt mixture. The results showed that the cotton stalk fiber can significantly improve the high temperature stability and low temperature crack resistance of asphalt mixture. Compared with the non-fiber mixture, the dynamic stability increased about 30%, the low temperature damage strain increased about 20%, and the water stability The basic road performance of cotton stalk fiber asphalt mixture and lignin fiber asphalt mixture is similar, the best asphalt dosage is slightly lower than lignin fiber asphalt mixture. The conclusion can provide reference for the application of cotton straw fiber in asphalt pavement.