Effect of alternating current electric field curing on properties of cement paste
Alternating current electric field curing(AC)is a rapid,green curing method that allows for intelligent temperature management of cement-based products.This research investigates the temperature fluctuation of cement paste specimens under the influence of four parameters,such as curing voltage,specimen length,cross-sectional area,water-cement ratio,and evaluates the mechanical characteristics of specimens with different peak temperatures in order to study the impact of AC on the properties of cement paste.Finally,the microscopic pore structure of the samples examined by MIP as well as the amount of energy consumed and electrical power per unit volume produced by the AC are discussed.The results demonstrate that the application of AC raises the peak temperature of the cement paste,while voltage,specimen cross-sectional area,specimen length and specimen water-cement ratio being the main parameters influencing the peak temperature of the specimens,in that order.The specimens'compressive strength appears to rise and then fall as peak temperature rises,which is supported by the MIP data.Since the hydration of the cement is accelerated by a rise in peak temperature,this leads to denser pore structures in the samples,which improve the specimens'early mechanical properties.However,high temperatures can also cause thermal damage to the samples,which impairs pore structures development.The peak temperature of the specimen can be raised by increasing the amount of energy and electrical power per unit volume of the specimen and by increasing the specific surface area of the mold.
alternating current electric field curingcement pastetemperaturerange analysispore structure
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