水力发电2024，Vol.50Issue(8)：94-102,9.
碱激发混杂玄武岩纤维粉煤灰混凝土耐久性研究
Study on Durability of Alkali-activated Hybrid Basalt Fiber Fly Ash Concrete
摘要
Abstract
Alkali activator can effectively improve the compactness of fly ash concrete.Based on 8% alkali activator,the effects of different basalt fiber(BF)lengths(9,12,25 mm)on the compressive strength,durability and microstructure of fly ash concrete are studied.The BP neural network is established to predict the durability of concrete.Combined with X-ray diffraction(XRD)and electron microscopy(SEM)techniques,the microstructure of the alkali-doped activator is characterized and analyzed.The test results show that,(a)when the basalt fiber is single-doped,the compressive strength and durability of the concrete are not significantly improved,and after 300 freeze-thaw cycles,the durability is the best when the three fiber lengths are mixed at 1∶1∶1;(b)according to the SEM image,BF plays a bridge role in the crack,indicating that 1∶1∶1 mixing can better constrain the development of cracks and significantly improve the durability of concrete;and(c)the regression coefficient R2 of calculation results of the proposed BP neural network damage prediction model are all greater than 0.99,indicating the model has higher accuracy,which can provide references and guidance for the design optimization of mix proportion to improve the durability of concrete.关键词
碱激发/玄武岩纤维/粉煤灰/冻融循环/混凝土/微观结构Key words
alkali excitation/basalt fiber/fly ash/freezing-thawing cycle/concrete/microstructure分类
建筑与水利引用本文复制引用
罗加辉,龚爱民,邵善庆,雍康..碱激发混杂玄武岩纤维粉煤灰混凝土耐久性研究[J].水力发电,2024,50(8):94-102,9.基金项目
云南省教育厅科学研究基金项目(2022Y286) （2022Y286）
