Study on the Effect of Modified Fly Ash on the Curing Performance of Building Adhesives
In order to improve the mechanical properties of building adhesives and reduce the environmental pollution caused by fly ash,it is proposed to use different modified fly ash as inorganic fillers to make adhesives.The results show that the heat flux value of the adhesive increases first,then decreases,and finally approaches 0 over time,while the curing degree shows a trend of increasing first and then gradually stabilizing;The addition of modified fly ash will slightly reduce the heat flow value and curing degree of the adhesive,and the larger the filling amount of modified fly ash,the greater the reduction;The complete curing degree at 60℃decreased by 25.6%compared to 80℃,and the higher the temperature,the shorter the time to complete the complete curing;The curing curve of the fly ash adhesive conforms to the Kamal model.The total reaction level of the modified fly ash adhesive is higher than that of the unmodified fly ash adhesive.The higher the temperature is,the greater the amount of modified fly ash is,and the higher the total reaction level is.However,when the amount of modified fly ash is increased,the adhesive system will gradually change from autocatalysis chemical control to diffusion control,so the amount of modified fly ash should not be too high.It is recommended not to exceed 30 phr.
modified fly ashadhesiveheat flux valuecuring degreefilling amountKamal model
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