高温射流冲蚀下耐火混凝土的热致劣化研究  

Study of thermal degradation performance of refractory concrete under high temperature jet flow

作　　者：马志宏 李斌[2] 马钢[3] 都思哲 李贝贝 张玉[3,4] MA Zhihong;LI Bin;MA Gang;DU Sizhe;LI Beibei;ZHANG Yu(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Taiyuan Satellite Launch Center,Taiyuan,Shanxi 030024,China;College of Civil Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou,Guangdong 510640,China)

机构地区：[1]太原理工大学机械与运载工程学院,山西太原030024 [2]太原卫星发射中心,山西太原030024 [3]太原理工大学土木工程学院,山西太原030024 [4]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《中国矿业大学学报》2022年第1期196-206,共11页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51808375)。

摘　　要：为了研究导流槽专用耐火混凝土在高温射流冲蚀下的劣化机制与损伤演化,采用高温射流试验平台对耐火混凝土进行了试验,并采用扫描电子显微镜、X射线衍射技术分析了耐火混凝土的微观形貌和物相的组成和变化.结果表明:在高温射流过程中,耐火混凝土内部发生了一系列的脱水、转化、结晶和烧结过程,产生了大量孔隙和裂缝,界面过渡区也遭到破坏;混凝土的耐高温冲蚀性能随养护天数的增加而降低,冲蚀次数对混凝土的抗高温性能、体积稳定性、抗热稳定性影响不显著;混凝土的间歇性冲蚀深度远小于连续性冲蚀深度.结合混凝土的损伤演化特征,根据试验条件提出了一种单次受火平均烧蚀深度的计算假设,并对导流槽混凝土的寿命周期进行了预测.In order to study the degradation mechanism and damage evolution of special refractory concrete for trough under high temperature jet flow.The refractory concrete was tested using a high temperature and high speed airflow test platform,and the microscopic morphology and phase composition and changes of the refractory concrete were analyzed by scanning electron microscope and X-ray diffraction.The results show that during the high temperature jetting process,a series of dehydration,transformation,crystallization and sintering processes occur in the refractory concrete,resulting in a large number of pores and cracks,and the interface transition zone is also destroyed;the high temperature erosion resistance of concrete varies with the number of curing days,the number of erosions has no significant effect on the high temperature resistance,volume stability,and thermal stability of concrete;the intermittent erosion depth of concrete is much smaller than the continuous erosion depth.Combined with the damage evolution characteristics of concrete,a calculation hypothesis for the average ablation depth of a single fire is proposed according to the experimental conditions,and the life cycle of the diversion channel concrete is predicted.

关 键 词：导流槽 耐火混凝土 高温射流冲蚀 劣化机制 损伤演化 

分 类 号：TU541[建筑科学—建筑技术科学]