In order to improve the early strength of concrete,according to the composition difference of different concrete formula system,the concrete specimens with different ages were formed by compounding nano-C-S-H seeds with admixture and early strength agent,and the influence of compounding on the initial and final setting time,compressive strength and flexural strength of concrete were analyzed.The results show that fly ash and silica fume can reduce the early compressive and flexural strength of concrete,while the influence of fly ash and silica fume on strength reduction can be weakened when nano C-S-H seeds were compounded with fly ash and silica fume.Nano C-S-H seeds can also alleviate the retarding effect of gypsum and synergize with gypsum,and can play a synergistic role with gypsum,sodium sulfate and sulphoaluminate cement to further improve the early strength of concrete.
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