摘要
本研究以偏高岭土为主要硅铝原材料,通过添加碳纤维来提高固化效率和导电性能,得到了不同交流电压养护2 h后的地聚合物抗压强度以及试样内部温度的变化规律,并通过扫描电镜(SEM)、压汞法(MIP)、X射线衍射(XRD)和傅里叶变换红外光谱(FTIR)等表征手段研究了其电养护机理。结果表明:随着交流电压的增大,地聚合物试样内部温度峰值增高,峰值到达时间减小,抗压强度增大;交流电压为5 V时抗压强度达到45 MPa,与常温养护相比增加了36%,与同时间烘箱养护相比增加了32%。随着交流电压的增大,凝胶结构致密,孔隙较小,碳纤维与凝胶界面之间粘接很好;Si—O—Si键和Si—O—Al键不对称拉伸和振动,波长向低方向移动导致抗压强度升高。
Metakaolin was used as the main raw material,and carbon fiber was added to improve the curing efficiency and conductivity.The compressive strength of geopolymer and the change of internal temperature of sample after 2 h of AC curing under different conditions were obtained.The mechanism of electrical curing was studied by scanning electron microscopy(SEM),mercury intrusion porosimetry(MIP),X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FTIR).The results show that with the increase of AC voltage,the peak temperature of geopolymer sample increases,the peak arrival time decreases,and the compressive strength increases.When the AC voltage is 5 V,the compressive strength can reach 45 MPa increased by 36%compared with normal temperature curing,and increased by 32%compared with oven curing at the same time.With the increase of the AC voltage,the gel microstructure is compact and the pores are small.The bonding between the carbon fiber and the gel interface is very good.FTIR analysis shows that the Si—O—Si bonds and Si—O—Al bonds are asymmetrically stretched and vibrate along with the increase of the AC voltage,and the wavelength shifts to the lower direction,resulting in the increase of the pressure resistance.
作者
王全林
胡云进
何曜谷
WANG Quanlin;HU Yunjin;HE Yaogu(School of Civil Engineering,Shaoxing University,Shaoxing 312000,China;Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province,Shaoxing 312000,China;Zhejiang Collaborative Innovation Center for Prevention and Control of Mountain Geologic Hazards,Shaoxing 312000,China)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2022年第6期1034-1039,共6页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(41977256)。
关键词
地聚合物
交流电压
内部温度
抗压强度
Geopolymer
AC voltage
Internal temperature
Compressive strength
作者简介
王全林(1993-),男,硕士研究生,主要从事新型建材方面的研究。E-mail:quanlin8wang@163.com;通信作者:胡云进,男,教授,博士,研究方向:土木工程材料性能。E-mail:huyunjin@tsinghua.org.cn。
