Study on properties of nano-SiO2 modified recycled mortar
Three reinforcement processes,cement slurry,nano-SiO2,and a combination of cement slurry and nano-SiO2,are used to treat recycled aggregates,and comparative analysis is conducted.The results show that the water absorption rate of the recycled aggregates reinforced with nano-SiO2 is 2.4%,and the crushing index is 4%.When the replacement rate of recycled aggregates is 40%,the 7-day flexural strength of the recycled mortar reinforced with nano-SiO2 reaches 26.72MPa,the 28-day flexural strength reaches 34.04MPa,and the 7-day compressive strength reaches 57.55MPa,the 28-day compressive strength reaches 68.46MPa.After 50 freeze-thaw cycles,the mass loss rate of the recycled mortar reinforced with nano-SiO2 decreases,its relative dynamic elastic modulus increases,and the frost resistance performance is significantly improved.
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