C-S-H nanocrystalline nuclei can promote cement hydration,improve the early strength development of concrete,and help prestressed concrete structures to prestress tension in advance.The effects of C-S-H nanocrystalline nuclei on the early strength,shrinkage and deformation properties of concrete and its development were studied.The experimental results show that the increase of curing temperature is beneficial to the early strength performance of nanocrystalline nuclei.The early strength of concrete increases first and then stabilizes with the increase of nanocrystal-line nucleus content.The early strength effect of concrete is the best when the content is 4％,and the later strength de-velopment is not affected.The early strength effect of nanocrystalline nucleus is better than that of other traditional ear-ly strength agents.The strength increase of traditional early strength agent 6 h is 10％～20％,and the strength increase of nanocrystalline nucleus can reach 105.2％,and the early strength effect is obvious.At the same time,the volume de-formation and strength development of nanocrystalline core-doped concrete are synchronized,mainly concentrated in the early stage,the pre-3 d shrinkage rate accounts for 67％of the shrinkage rate at 28 d age,and the 28d shrinkage rate of the nanocrystalline core-doped specimen is 75％of the blank group,and the volume stability is good,and the pres-tressed tension can be realized.
维普
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