环境溶液碱度对混凝土用纤维性能的影响  

Impact of the alkalinity of environmental solutions on the properties of fibre used in concrete

作　　者：胡欣欣 杨鼎宜[1] 张帅[1] 

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225009

出　　处：《混凝土》2017年第10期96-99,103,共5页Concrete

基　　金：国家自然科学基金(51578479);国家重点研发计划(2016YFB0303104)

摘　　要：为了对比分析玄武岩、普通玻璃纤维在不同碱度混凝土环境中的耐碱性能,采用不同p H值Na OH溶液来模拟不同碱性混凝土环境的方法,对腐蚀溶液中的玄武岩纤维和普通玻璃纤维进行常温和加温浸泡试验。探究两种纤维在不同碱性环境中力学性能随时间及温度的变化趋势。并使用扫描电镜和EDS能谱分析纤维经强碱腐蚀后表面形貌及元素的变化情况。试验结果表明:玄武岩纤维在室温条件下的耐碱性能要优于普通玻璃纤维,随着浸泡温度的升高,玄武岩纤维的耐碱性能下降。电镜照片和能谱分析显示,两种纤维在强碱溶液中的腐蚀都较严重,纤维的网络形成体元素的含量都急剧下降。In order to compare and analyze the corrosion-resistant property of basalt fiber and general glass fiber in different alkali concrete environment.The properties of basalt fiber and general glass fiber can be tested through the method of simulating different alkali concrete environment by using sodium hydroxide solution with different pH values at room and heightened temperature.The variation in tensile strength with time and temperature in different environmental solutions for two types of fibers as summarized by this method. Microstruc-tural investigations and energy spectrum analysis of fiber were undertaken to elucidate the changes of surface morphology and element of fibers which have been soaked in alkali solution.The test results show that the alkali resistant properties of basalt fiber is superior to that of general glass fiber at room temperature.However, with the temperature increases, the corrosion-resistant property of basalt fiber is decreased.At the same time,the micrographs of scanning electron microscope and the analysis of energy spectrum show that two kinds of fiber are subject to severe corrosion in alkali solution and the content of the network element of the fiber is decreased sharply.

关 键 词：玄武岩纤维 普通玻璃纤维 耐碱性能 微观形貌 元素变化 

分 类 号：TU528.042[建筑科学—建筑技术科学]