Effect of metakaolin on physical and mechanical properties and microstructure of foamed concrete
In order to explore the influence of metakaolin on foam concrete,foamed concrete with dry density of 600 kg/m3 was prepared,The effects of metakaolin on the fluidity,28-day compressive and flexural strength,water absorption and softening coefficient of foamed concrete were studied by replacing cement with different mass fractions(6%,12%,18%,24%,30%)of metakaolin.The changes of phase composition,pore structure and microstructure were studied by X-ray diffraction and scanning electron microscopy.The test and research results show that metakaolin can significantly improve the compressive strength of foamed concrete,and the best content of flexural strength,water absorption and softening coefficient is 12%,which can be explained by the mutual reflection and improvement mechanism of phase analysis and micro morphology.Microstructure a-nalysis shows that metakaolin has a positive effect on foam concrete by improving compactness and pore struc-ture.
foam concretemetakaolinphysical and mechanical performancephase compositionappearance and structure
万方数据
维普
