• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
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  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 20 Issue 1
Feb.  2007
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Article Contents
LI Guhua, GAO Bo. Effect of Nano-SiO2 on Performance of Concrete in Dissolving/Crystalling Cycles of Salts[J]. Journal of Southwest Jiaotong University, 2007, 20(1): 70-74.
Citation: LI Guhua, GAO Bo. Effect of Nano-SiO2 on Performance of Concrete in Dissolving/Crystalling Cycles of Salts[J]. Journal of Southwest Jiaotong University, 2007, 20(1): 70-74.

Effect of Nano-SiO2 on Performance of Concrete in Dissolving/Crystalling Cycles of Salts

  • Received Date: 22 Mar 2006
  • Publish Date: 25 Feb 2007
  • To improve the performances of concrete in sea water or soil with inorganic salts,the performance of concrete with nano-SiO2 in dissolving/crystalling cycle of salts was investigated by the experiment of concrete strength,and the microstructure of concrete was analyzed with SEM(scanning electron microscope) and XRD(X-ray diffraction).The result shows that nano-SiO2 can improve the performances of concrete.By considering the performance of concrete and its construction cost,the optimum mass fraction of nano-SiO2 is 1%.Compared with normal concrete,modulus ratio and special modulus ratio of the concrete with 1%(mass fraction) nano-SiO2 in dissolving/crystalling cycle of salts increase by respectively 11% and 20% after 110 cycles.The analysis of the microstructure shows that nano-SiO2 can improve interface structure between cement and aggregate,and decrease the content of Ca(OH)2 in concrete.

     

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