新型沥青混合料掺加料玉米秸秆纤维的制备工艺及改性方法

徐豪¹，王琨^1*，樊丽然¹，吴明君²

1.山东交通学院 交通土建工程学院，山东 济南  250357；

2.济南北方交通工程咨询监理有限公司，山东 济南  250031

摘要：为扩大改性玉米秸秆纤维在沥青路面施工中的应用，采用机械剪切方式湿法制备玉米秸秆纤维，并采用NaOH溶液对其改性，通过酸碱度、吸油性、耐热性、灰分含量及吸持性试验分析改性玉米秸秆纤维的路用性能。结果表明：玉米秸秆纤维的最佳改性工艺为在质量分数为5%的NaOH溶液中浸润30 min；改性后玉米秸秆纤维呈弱碱性，与沥青的黏附性增强，吸油性和耐热性明显提高，抗拉强度略有减小，与沥青的相容性提高约10%。改性后玉米秸秆纤维的路用性能得到提升，与木质素纤维相近，可替代木质素纤维作为沥青混合料的掺加料，降低工程成本。

关键词：玉米秸秆纤维；制备工艺；改性方法；路用性能；沥青混合料

Preparation technology and modification method of corn stover fiber as new asphalt admixture

XU Hao¹, WANG Kun^1*, FAN Liran¹, WU Mingjun²

1.School of Transportation and Civil Engineering, Shandong Jiaotong University, Jinan 250357, China；

2. Jinan North Traffic Engineering Consulting and Supervision Co., Ltd., Jinan 250031, China

Abstract: In order to improve the application of modified corn straw fiber in asphalt pavement construction, the corn straw fiber is prepared by mechanical shearing wet method and modified by NaOH solution. The road performance of modified corn straw fiber is analyzed by tests of pH, oil absorption, heat resistance, ash content and absorption. The results show that the optimum modification process of corn straw fiber is soaked in 5% NaOH solution for 30 min. The modified corn straw fiber is weakly alkaline, the adhesion with asphalt is enhanced, the oil absorption and heat resistance are significantly improved, the tensile strength is slightly reduced, and the compatibility with asphalt is increased by about 10%. The road performance of modified corn straw fiber is improved, which is similar to lignin fiber, and can replace lignin fiber as the admixture of asphalt mixture, and reduce the engineering cost.

Keywords: corn straw fiber; preparation technology; modifying method; road performance; asphalt mixture