摘要
以煤矸石作细集料复合矿渣制备不同水胶比的混凝土,通过正交试验,研究水胶比、矿渣掺量、煤矸石细集料掺量对混凝土抗压强度、抗冻性能的影响,并探讨影响其力学性能的微观机理。试验结果表明:水胶比和矿渣掺量对混凝土抗压强度影响显著,煤矸石细集料掺量影响较小;矿渣掺量和煤矸石细集料掺量对混凝土抗冻性能影响显著,水胶比影响较小;综合考虑抗冻性能和抗压强度,确定本实验最优配比设计为水胶比0.4~0.45、矿渣掺量30%、煤矸石细集料掺量30%;最后,通过分形理论计算分析SEM图像分形维数变化规律,确定煤矸石细集料-矿渣混凝土分形维数与强度呈负相关。
The concrete with different water cement ratio was prepared with slag as binder material and coal gangue as fine aggregate.The effects of water binder ratio,slag content and coal gangue content on the compressive strength and frost resistance of concrete was studied through orthogonal experiments,and the influence of microscopic mechanism on the mechanical properties was discussed.Results showed that the water binder ratio and slag content had a significant effect on the compressive strength,and the effect of coal gangue as fine aggregate was small.The slag and coal gangue content had a significant effect on the frost resistance of concrete,and the effect of water binder ratio was small.In order to improve the compressive strength and frost resistance comprehensively,the optimal mix proportion was water binder ratio as 0.4-0.45,30% slag content,and 30%coal gangue as fine aggregate.Moreover,the fractal dimension of the scanning electric morphology(SEM)was calculated based on fractal theory.Results showed that the fractal dimension of coal gangue/slag concrete was negatively related to the strength.
作者
朱红光
霍青杰
倪亚东
许校男
杭泽涛
王涛
杨赛
ZHU Hongguang;HUO Qingjie;NI Yadong;XU Xiaonan;HANG Zetao;WANG Tao;YANG Sai(School of Mechanics&Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第22期22085-22091,共7页
Materials Reports
基金
国家自然科学基金(51578539)。
关键词
正交试验
抗压强度
抗冻性能
综合性能
SEM
分形
orthogonal test
compressive strength
frost resistance
comprehensive performance
SEM
fractal dimension
