基于CT图像三维重建的高温下高性能混凝土孔隙衍化分析  

Analysis of High Performance Concrete Pore Derivation under High Temperature Based on 3D Reconstruction of CT Images

作　　者：石丽娜 杜红秀[1] 徐瑶瑶 SHI Lina;DU Hongxiu;XU Yaoyao(School of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学土木工程学院,太原030024

出　　处：《硅酸盐通报》2020年第7期2159-2164,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51278325)。

摘　　要：为研究高温对高性能混凝土内部孔隙变化的影响,采用X射线CT技术,分别对常温、200℃、300℃、400℃、500℃、600℃温度作用下的混凝土进行扫描和图像重建,采用MIMICS软件对掺与不掺聚丙烯纤维混凝土进行三维细观结构重建,分析其内部孔隙随温度的变化情况。结果表明,随着温度的升高,混凝土内部孔隙体积及孔隙表面积呈不同幅度增加,混凝土内部微结构不断劣化,掺加聚丙烯纤维,在400℃前可明显改善混凝土内部结构高温劣化,在200~400℃时可减缓混凝土小孔隙的增加,有利于抑制高性能混凝土的高温爆裂,并减缓高温对混凝土内部结构劣化的影响。To study the influence of high temperature on the internal pore changes of high performance concrete,X-ray CT technology was used to scan and reconstruct the images of concrete under normal temperature,200℃,300℃,400℃,500℃,600℃,and MIMICS software was used to reconstruct the three-dimensional microstructure of concrete with and without polypropylene fiber,and the changes of internal pore with temperature were analyzed.The results show that with the increase of temperature,the internal pore volume and surface area of concrete increase in different amplitudes,and the microstructure of concrete deteriorates.Adding polypropylene fiber can obviously improve the high temperature deterioration of the internal structure of concrete before 400℃.Adding polypropylene fiber can slow down the increase of small pores of concrete at 200-400℃,which is conducive to suppressing high temperature concrete bursting and slowing down the impact of high temperature on the internal structural deterioration of concrete.

关 键 词：高性能混凝土 高温 三维细观重建 劣化衍化 

分 类 号：TU528[建筑科学—建筑技术科学]