青稞纤维表面改性及其对生态混凝土力学性能的影响  

Surface Modification of Highland Barley Fiber and Its Modification Effect on Mechanical Properties of Ecological Concrete

作　　者：赵玉青 王建翎 ZHAO Yu-qing;WANG Jian-ling(School of Civil Engineering and Transportation,North China University of Water Resources and Electric Power,Zhengzhou 450011,China;School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]华北水利水电大学土木与交通学院,郑州450011 [2]哈尔滨工业大学交通科学与工程学院,哈尔滨150090

出　　处：《中国农村水利水电》2022年第6期16-23,共8页China Rural Water and Hydropower

基　　金：西藏科技厅项目(ALQYKJCX2020-03)。

摘　　要：为了研究青稞纤维对生态混凝土力学性能的提升,采用NaOH、NaOH+H_(2)O_(2)、冰醋酸+NaClO_(2)等处理方法对青稞纤维进行表面改性处理,通过正交试验寻求最佳改性方式,同时借助XRD、FTIR、SEM等测试手段,从不同角度对不同处理的青稞纤维进行表征;将改性前后的青稞纤维掺入生态混凝土中,分别测试其抗压、劈裂抗拉和抗折强度,分析改性效果和对生态混凝土力学性能的影响规律。结果表明,采用6%NaOH+10%H_(2)O_(2)溶液在40~50℃环境下对青稞秸秆纤维预处理,表面改性效果优良;纤维的掺入减小了生态混凝土内部的孔隙含量,混凝土的立方体抗压强度有所降低,而抗拉、抗弯能力大大增强;相较于未改性纤维混凝土,改性纤维混凝土的28 d抗压、抗折、劈裂抗拉强度分别提高了4.3%、16.5%、20.3%,纤维素得到有效提纯,大大提高了生态混凝土结构的整体性和韧性。In order to study the improvement of highland barley fiber on the mechanical properties of ecological concrete,NaOH,NaOH+H_(2)O_(2),or glacial acetic acid+NaClO_(2)are used to modify the surface of highland barley fibers.The optimum modification method is sought through the orthogonal test.Meanwhile,with the assistance of modern material testing methods like XRD,FTIR,SEM etc.,modification effects are evaluated from different perspectives.The highland barley fiber before and after modification is then mixed into ecological concrete,measuring its compressive,splitting tensile and flexural strength respectively to analyze modification effect and its influence on the mechanical properties of the ecological concrete.The results show that the pretreatment of highland barley fiber with 6%NaOH+10%H_(2)O_(2)solution at 40~50℃has a superior surface modification effect.In addition,the incorporation of fibers has decreased the pore contents inside the ecological concrete.The compressive strength of fiber ecological concrete is lower than that of ordinary ecological concrete,while its tensile and bending resistance are significantly enhanced.Compared to unmodified fiber concrete,the 28 d compressive,flexural,and splitting tensile strengths of modified fiber concrete has increased by 4.3%,16.5%and 20.3%respectively.Hence,cellulose in highland barley fiber is effectively purified,which greatly improves the integrity and toughness of the ecological concrete structure.

关 键 词：青稞纤维 表面改性 生态混凝土 力学性能 

分 类 号：TU528.45[建筑科学—建筑技术科学]