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Volume 54 Issue 4
Jul.  2019
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Article Contents
Journal of Southwest Jiaotong University  > 2019  >  54(4): 879-884.
LI Maohong, PAN Zhang, LING Chenbo, YAO Ning, LI Shuxian, WANG Ping. Improving the Performance of Sodium Silicate for Track Slab by Promoting Polymerization and Biomineralization[J]. Journal of Southwest Jiaotong University, 2019, 54(4): 879-884. doi: 10.3969/j.issn.0258-2724.20180599
Citation: LI Maohong, PAN Zhang, LING Chenbo, YAO Ning, LI Shuxian, WANG Ping. Improving the Performance of Sodium Silicate for Track Slab by Promoting Polymerization and Biomineralization[J]. Journal of Southwest Jiaotong University, 2019, 54(4): 879-884. doi: 10.3969/j.issn.0258-2724.20180599
shu

Improving the Performance of Sodium Silicate for Track Slab by Promoting Polymerization and Biomineralization

doi: 10.3969/j.issn.0258-2724.20180599
  • Received Date: 06 Jul 2018
  • Rev Recd Date: 15 Sep 2018
    • Available Online: 06 Jun 2019
  • Publish Date: 01 Aug 2019
    Abstract
  • To improve the mechanical strength and water resistance of sodium silicate used for track slab coating in high-speed railways, Ca(H2PO4)2 was added into sodium silicate to promote biomineralization and polymerization of silica gel. First, Sodium silicate modified by Ca(H2PO4)2 was prepared, using sodium silicate without adding Ca(H2PO4)2 as a control. The property of the sample was tested by universal material testing machine and water resistance testing; and the composition and microstructure of the sample were characterized by X-ray diffractometer(XRD), Fourier-transform infrared spectrometer(FTIR), and 29Si nuclear magnetic resonance instrument(29Si NMR). Results show that the addition of Ca(H2PO4)2 increased mechanical strength by 160% and improved water resistance from 2 h to more than 7 d for sodium silicate; adding Ca(H2PO4)2 into sodium silicate led to biomineralization by forming Ca8H2(PO4)6•?H2O-NaHCO3-H2O, which is the main inorganic component of Human bone with high mechanical strength and good water resistance; and Ca(H2PO4)2 promoted the polymerization of silica gel to form silica oxygen polymer with higher mechanical strength and better water resistance in sodium silicate. It is concluded that the addition of Ca(2PO4)2 greatly improved the mechanical strength and water resistance of sodium silicate after setting and hardening, which may have promising applications in track slab coating.

     

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