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为了探索粉煤灰对MgO混凝土长龄期自生体积变形的影响规律,在室内测试了长达4a龄期的不同粉煤灰掺量的MgO混凝土的自生体积变形,并从部分试件中钻孔取芯进行电镜扫描观测及能谱分析。结果表明:随着龄期的延长,粉煤灰对MgO混凝土的长龄期自生体积膨胀变形的抑制作用增强,且粉煤灰对一、二级配MgO混凝土的长龄期自生体积膨胀变形的抑制作用强于三级配MgO混凝土。同时,掺入适量粉煤灰后,长龄期MgO混凝土的微观结构更加致密。
In order to explore the rule of fly ash on the long-term autogenous volume deformation of MgO concrete, the autogenous volume deformation of MgO concrete with different fly ash content up to the age of 4a was tested indoors, and some of the specimens were drilled Coring microscopy scanning electron microscopy and energy spectrum analysis. The results show that as the age prolongs, the inhibitory effect of fly ash on the long-term autogenous volume expansion deformation of MgO concrete increases, and the long-term autogenous volume expansion and deformation of the primary and secondary MgO concretes Inhibition stronger than three with MgO concrete. At the same time, the microstructure of long-aged MgO concrete is more dense after adding appropriate amount of fly ash.