硅灰对掺有无碱速凝剂水泥浆体性能的影响

doi:10.11896/cldb.18040280

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Abstract This study evaluates the effect of silica fume on the properties of cement paste with alkali-free accelerator. Setting times, compressive strength, hydration heat emission, early volume change and rebound rate of accelerated cement paste with different silica fume dosage were measured. The results show that a proper dosage of silica fume can shorten the setting time and increase the compressive strength of the accele-rated cement paste, decrease the rebound rate of shotcrete and promote the cement hydration. Moreover, according to the characteristics of the early volume change and hydration heat emission curve, the hydration process of the cement paste with alkali-free accelerator can be divided into four periods, including dissolution-crystallization period, crystal growth period, acceleration period and stable period. The effect of silica fume on the properties of cement paste with alkali-free accelerator mainly manifest in crystal growth period and acceleration period.

Key words： silica fume alkali-free accelerator cement paste

Published: 19 June 2019

CLC number:

TU528.042

Fund:This work was financially supported by the National and Technology Program During the 13th 5-year Plan Period (2016YFC0701004), National Natural Scie-nce Foundation of China (51678441) and High Speed Rail Joint Fund (U1534207).

About author:: Chao Chenis a master candidate at Tongji University. He received his B.S. from 2012 to 2016 at Tongji University. His research interests include cement and alkali-free accelerators.Zhenping Sunis a department head of School of Materials Science and Engineering, Tongji University. He received his B.S. from 1987 to 1992 at Tongji University; M.S. from 1992 to 1995 at Tongji University; and Ph.D. from 1999 to 2002 at Tongji University. His research interests include admixtures, cement hydration, concrete and so on.

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Cite this article:

CHEN Chao,SUN Zhenping. Effect of Silica Fume on the Properties of Cement Paste with Alkali-free Accelerator[J]. Materials Reports, 2019, 33(14): 2348-2353.

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http://www.mater-rep.com/EN/10.11896/cldb.18040280 OR http://www.mater-rep.com/EN/Y2019/V33/I14/2348

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