玄武岩纤维混凝土纤维分布及孔隙结构表征  

Fiber distribution and pore structure characterization of basalt fiber reinforced concrete

作　　者：陈峰宾[1] 许斌 焦华喆[1] 褚怀保[1] 王云飞[1] 刘娟红[2] CHEN Fengbin;XU Bin;JIAO Huazhe;CHU Huaibao;WANG Yunfei;LIU Juanhong(School of Civil Engineering,Henan Polytechnic University,Jiaozuo,Henan 454003,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]河南理工大学土木工程学院,河南焦作454003 [2]北京科技大学土木与资源学院,北京100083

出　　处：《中国矿业大学学报》2021年第2期273-280,共8页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(U1904188,51834001,51974105);河南省高校科技创新人才支持计划(19HASTIT047);河南省科技攻关计划项目(182102310012,172102210286)。

摘　　要：为了探究玄武岩纤维对混凝土28 d抗压强度的影响机理,对6组不同玄武岩纤维掺量(0,1.5,3.0,4.5,6.0,7.5 kg/m^(3))的玄武岩纤维混凝土(Basalt fiber reinforced concrete,BFRC)进行CT扫描,从微观层次探究纤维分布及基体原生孔隙特征对混凝土28 d抗压强度的影响.为解决CT扫描后纤维可视化困难这一问题,使用Avizo软件中的分水岭算法和搜索锥算法,建立了孔隙网络模型和纤维分布模型.通过该方法,定量描述了不同纤维掺量下孔隙特征参数的变化及纤维分布.结果表明:纤维的掺入能够抑制孔隙的连通,使得部分较大孔隙得到充填,从而改变孔隙率与孔径分布比;各纤维之间相互搭接,共同构成网状结构,有利于混凝土整体性的提高,可有效增强混凝土28 d抗压强度.In order to explore the mechanism of the effect of basalt fiber on the 28 d compressive strength of concrete,six groups of basalt fiber reinforced concrete(BFRC)with different basalt fiber dosage(0,1.5,3.0,4.5,6.0,7.5 kg/m^(3))were scanned by CT,and the effect of fiber distribution and matrix primary pore characteristics on the 28 d compressive strength of concrete were explored from the microscopic level.In order to solve the problem of fiber visualization after CT scanning,the watershed algorithm and search cone algorithm in the Avizo software were used to establish the pore network model and fiber distribution model.In this way,the changes of characteristic parameters of pore structure and fiber distribution under different fiber dosages were quantitatively described.The results show that the addition of fiber can restrain the connectivity of pores and make some larger pores filled,thus changing porosity and pore diameter distribution.And the fiber form a network structure in the concrete,which is beneficial to the improvement of the integrity of concrete and can effectively enhance the 28 d compressive strength of concrete.

关 键 词：玄武岩纤维混凝土 CT扫描 三维重构 微观表征 纤维可视化 

分 类 号：TU528.58[建筑科学—建筑技术科学]