Evolution of Compression Freeze-thaw Damage of Fly Ash Concrete Under Different Curing Systems
To study the evolution law of concrete freeze-thaw compression damage under different curing systems,freeze-thaw cycle tests and uniaxial compression-acoustic emission tests for steam cured concrete were conducted.The re-sults indicate that the compressive failure process of freeze-damaged steam cured concrete can be divided into three stages:instantaneous deformation period(Phase Ⅰ),deformation development period(Phase Ⅱ),and deformation steep in-crease period(Phase Ⅲ).As the number of freeze-thaw cycles increases,the boundary point between the deformation de-velopment period and the deformation steep increase period shifts backward on the horizontal axis of time,and the peak cumulative event number shows a trend of increasing first and then decreasing.Excessive steam curing temperature is detrimental to the frost resistance of concrete.
curing systemfly ash concretefreeze-thaw cyclefreeze damage and compressiondegree of damageacoustic emission
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