促聚合与生物矿化改善轨道板用钠水玻璃性能

李茂红; 潘璋; 凌晨博; 姚宁; 李书娴; 王平

doi:10.3969/j.issn.0258-2724.20180599

促聚合与生物矿化改善轨道板用钠水玻璃性能

doi: 10.3969/j.issn.0258-2724.20180599

李茂红^1,,
潘璋¹,
凌晨博¹,
姚宁²,
李书娴¹,
王平^1, ,

基金项目: 国家杰出青年科学基金资助项目（51425804）；国家自然科学基金资助项目（51708458）

详细信息

作者简介:
李茂红（1977—），女，高级工程师，博士，研究方向为胶凝材料、涂料、混凝土等，E-mail：sclimaohong@swjtu.edu.cn

通讯作者:
王平（1969—），男，教授，研究方向为道路与铁道工程，E-mail：wping@home.swjtu.edu.cn

中图分类号: TU52；TU58
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- 被引次数: 0
出版历程
- 收稿日期: 2018-07-06
- 修回日期: 2018-09-15
- 网络出版日期: 2019-06-06
- 刊出日期: 2019-08-01

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

摘要

摘要: 为改善高铁轨道板涂料用钠水玻璃力学强度和耐水性，通过添加Ca(H₂PO₄)₂，达到促进钠水玻璃生物矿化、提高硅氧聚合程度的目的. 首先在钠水玻璃中添加Ca(H₂PO₄)₂制作样品，以未添加Ca(H₂PO₄)₂的样品作空白对照；然后用万能材料试验机、耐水性试验检测样品性能，并用X-射线衍射仪、傅里叶红外光谱仪、固体核磁共振仪测试其微观组成和结构. 研究结果表明：Ca(H₂PO₄)₂添加导致钠水玻璃力学强度提高160%，耐水性由浸水2 h完全溃散提高至浸水7 d无明显损坏；促使钠水玻璃仿生矿化形成力学强度高、耐水性好的人体骨主要无机成分Ca₈H₂(PO₄)₆•?H₂O-NaHCO₃-H₂O；增强钠水玻璃中硅氧的聚合，使之形成耐水性更好的硅氧聚合体. 可推断得，添加Ca(H₂PO₄)₂可明显提高钠水玻璃凝结硬化后力学强度和耐水性，具有应用于轨道板涂料的前景.
- 聚合 /
- 生物矿化 /
- 钠水玻璃 /
- 耐水性 /
- 力学强度
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.
- polymerization /
- biomineralization /
- sodium silicate /
- water resistance /
- mechanical strength

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图 1 耐水性试验

Figure 1. Water resistance tests

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图 2 C-WG和MCP-WG的抗压强度

Figure 2. Compressive strength of C-WG and GX-WG

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图 3 C-WG和MCP-WG的XRD图谱

Figure 3. XRD patterns of C-WG and MCP-WG

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图 4 MCP-WG烘干后的XRD图谱

Figure 4. XRD patterns of MCP-WG after drying

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图 5 C-WG和MCP-WG的FTIR图谱

Figure 5. FTIR patterns of C-WG and MCP-WG

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图 6 C-WG和MCP-WG的²⁹Si NMR图谱

Figure 6. ²⁹Si NMR patterns of C-WG and MCP-WG

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图 7 Ca(H₂PO₄)₂与钠水玻璃相互作用示意

Figure 7. Schematic diagram of the interaction between Ca(H₂PO₄)₂ and sodium silicate

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