摘要
标准养护条件下,以0%、30%、60%与100%铁尾矿替代石英砂制备活性粉末混凝土(RPC),为探究高温对其性能的影响,进行了200、400、600与800℃高温后铁尾矿RPC强度试验、阻尼试验、X射线衍射(XRD)试验和扫描电镜(SEM)试验,分析了温度与铁尾矿掺量对RPC表观特征、质量损失、抗压与抗折强度、阻尼性能以及微观结构的影响。结果表明,随着温度升高,铁尾矿RPC质量损失率增大,抗压与抗折强度降低,阻尼比提高,CH峰强度降低,砂浆基体由完整变得松散并且孔隙率与微裂纹数量提高;随着铁尾矿取代率的增加,RPC表观裂纹增多,质量损失率增大,抗压与抗折强度降低,阻尼比提高。
Under standard curing condition,iron tailings of 0%,30%,60%and 100%were used to replace quartz sand to prepare reactive powder concrete(RPC).In order to explore the influence of high temperature on its performance,the strength,damping,X-ray diffraction(XRD)and scanning electron microscope(SEM)tests of iron tailings RPC at 200℃,400℃,600℃and 800℃were carried out.The effects of temperature and iron tailings content on apparent characteristics,mass loss,compressive strength,flexural strength,damping property and microstructure of RPC were analyzed.The results show that temperature rising causes the increase of mass loss rate,the decrease of compressive strength and flexural strength,the adding of damping ratio,the attenuation of CH peak strength and the increase of porosity and number of microcracks in iron tailings RPC.Meanwhile,mortar matrix changes from complete to loose.With the increase of iron tailings'replacement rate,apparent cracks,mass loss and damping ratio increase,while compressive strength and flexural strength decrease.
作者
田耀刚
黄显龙
路鑫
阎宝宝
覃超
卯爱军
鲁涛
张军
TIAN Yaogang;HUANG Xianlong;LU Xin;YAN Baobao;QIN Chao;MAO Aijun;LU Tao;ZHAO Jun(School of Materials Science and Engineering, Chang'an University, Xi'an 710064, China;Chang'an University,Engineering Research Center of Pavement Materials, Ministry of Education of P.R.China, Xi'an 710064,China;Xi'an Highway Research Institute, Xi'an 710065, China;CCCC Wuhan Harbour Engineering Design and Research Co., Ltd.,Wuhan, 430050, China;Chang'an University, National Engineering Laboratory for Highway Maintenance Equipment, Xi'an, 710064,China)
出处
《功能材料》
CAS
CSCD
北大核心
2022年第6期6001-6005,6018,共6页
Journal of Functional Materials
基金
国家自然科学基金项目(51878065)
陕西省科技厅科研项目(2021KJXX-80)
广西省交通运输行业重点科技项目(19-09)
陕西省交通厅项目(20-30X)。
关键词
活性粉末混凝土
铁尾矿
高温
力学性能
阻尼性能
微观结构
reactive powder concrete
iron tailings
high temperature
mechanical properties
damping property
microstructure
作者简介
通讯作者:田耀刚(1978—),男,教授,博士研究生导师,从事新型道路材料与道路养护材料、高性能水泥基材料等研究,E-mail:ygtian@chd.edu.cn。
