Alkali activated slag(AAS)has the potential to be applied in winter construction due to its continuous hydration at subzero temperature.To further enhance the mechanical properties of AAS as structure repair materials in cold region,OPC at proportions of 5％,10％,15％and 20％were incorporated as partial replacement of ground granulated blast-furnace slag(GGBS)in AAS.An appropriate OPC content of 15％was determined based on the setting time and mechanical testing,and the results showed that it increased the compressive and flexural strength of AAS by 31.3％and 25.18％at the age of 1 day and by 4.5％and 7.2％at the age of 28 days.Moreover,semiadiabatic calorimetry,attenuated total reflection fourier transform infrared spectroscopy and scanning electron microscope mea-surements were carried out on typical samples.Experimental results showed that the hydration heat was enhanced and the generation ratio of C(-A)-S-H was increased by incorporation of OPC into AAS,and improve microstructure.
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