煤矸石对泡沫混凝土孔结构的影响

Effect of Coal Gangue on Pore Structure of Foam Concrete

本文将粉磨之后的煤矸石替代部分水泥掺入到混凝土中,通过物理发泡工艺制备煤矸石泡沫混凝土。采用FiJi-imageJ图像分析技术等对泡沫混凝土的孔径分布、平均孔径、气孔直径等进行表征,分析了煤矸石改善泡沫混凝土成孔的原因以及煤矸石粉磨粒径对泡沫混凝土抗压强度的影响。结果表明:当掺入粒径为45μm的煤矸石粉时,泡沫混凝土的强度随着掺量的增加逐步下降,而掺入粒径为15μm的煤矸石粉时,强度则随掺量的增加呈先上升后下降的趋势;在调节孔结构方面,粒径为45μm的煤矸石粉优于粒径为15μm的煤矸石粉,并在50%(质量分数)掺量下达到最优效果。

The coal gangue after grinding was added into concrete instead of part of cement,and the coal gangue foam concrete was prepared by physical foaming process.Then,the pore size distribution,average pore size and pore diameter of foam concrete were characterized by FiJi-imageJ image analysis technology.The reasons for improving the porosity of foam concrete by coal gangue and the effect of coal gangue particle size on the compressive strength of foam concrete were analyzed.The results show that when the coal gangue powder with particle size of 45μm is added,the strength of foam concrete decreases with the increase of coal gangue content,while when the coal gangue powder with particle size of 15μm is added,the strength increases first and then decreases with the increase of coal gangue content.The coal gangue powder with particle size of 45μm is better than the coal gangue powder with particle size of 15μm in adjusting the pore structure,and the optimal effect is achieved at the content of 50%(mass fraction).