Influence of fly ash on the long-term autogenetic volume deformation of concrete mixed with magnesium oxide
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Abstract:
In order to explore the influence of fly ash on the long-term autogenetic volume deformation of concrete mixed with magnesium oxide (MgO), the long-term autogenetic volume deformation of up to 4-year-old MgO concrete specimens with different contents of fly ash was measured, and cores were taken from part of specimens for scanning election microscopy (SEM) and energy spectrum detection．The results showed that the longer the time was, the stronger the inhibitory effect of fly ash on autogenetic volume deformation of MgO concrete was, and it was strongest for one-grade MgO concrete, followed by the two-grade MgO concrete and three-grade MgO concrete. The microstructure of MgO concrete with fly ash in proper content was densified gradually with ages.
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