| 1ST CONFERENCE ON RESEARCH AND APPLICATION OF ADVANCED CEMENTITIOUS MATERIALS |
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| Synergistic Effect of Nano Silica and Fly Ash on the Cement-based Materials |
| ZHANG Xiuzhi1,2, LIU Mingle1,2, DU Xiaohan3, YANG Xiangzi1,2, ZHOU Zonghui1,2
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1 School of Materials Science & Engineering, University of Jinan, Jinan 250022;
2 Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, Jinan 250022;
3 School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401 |
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Abstract The synergistic effect of nano silica and fly ash on cement based materials was studied by adjusting the ratio of nano SiO2 and fly ash. The results showed that the effect of nano silica and fly ash on cement is better than that of adding single nano silica. The early compressive strength reduction by fly ash can be compensated by adding 3% nano silica and less than 30% fly ash into mortar without the decrement of 28 days compressive strength. The drying shrinkage of mortar increased with the increase of nano SiO2, but the fly ash can relieve the drying shrinkage of nano SiO2. With the increase of nano silica, the freeze thaw resistance and chloride corrosion resistance of the specimens were improved, and 3% nanometer silica and 30%fly ash could further enhance the durability of cement-based materials. Nano SiO2 can shorten the induction period of cement hydration and accelerated the process of cement hydration, and the total heat release was increased when nano SiO2 was added. When adding nano SiO2 into the cement-fly ash system, the content of non evaporated water was increased obviously in the early stage, but the increment of the non evaporated water in the late stage was slow. The synergistic effect of nanosilica and fly ash improves the performance of cement mortar, which is beneficial to the performance complementarity.
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Published: 25 December 2017
Online: 2018-05-08
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2017, Vol. 31 
