• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International conference on alkali activated materials and geopolymers: versatile materials offering high performance and low emissions 2018 >NEW INSIGHTS INTO THE ROLE OF HYDROXIDE IONS AND SILICATE SPECIES DURING GEOPOLYMERIZATION
【24h】

NEW INSIGHTS INTO THE ROLE OF HYDROXIDE IONS AND SILICATE SPECIES DURING GEOPOLYMERIZATION

机译：地聚合过程中氢氧根离子和硅酸盐物种作用的新认识

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The specific role of hydroxide ions in highly alkaline silicate solutions has been hardly investigated due to the difficulty to quantify them. In this study, Hammet acidity functions of sodium silicate solutions have been assessed for the first time. The low acidity function values found in these solutions, when compared to pure sodium hydroxide solutions, has been explained by the buffering effect of silicate species using liquid state 29Si NMR. Such a parameter has then been used to quantify the hydroxide ions ability to react during mixing alkali silicate solutions with metakaolin. Despite lower initial acidity function values for equivalent sodium hydroxide additions when compared to silicate-free solutions, it has been demonstrated that dissolution of the studied metakaolin is much more efficient in presence of silicate species. Such a phenomenon has been attributed to the gradual release of hydroxide ions resulting from silicate species condensation during the metakaloin dissolution.
机译：由于难以定量氢氧根离子在高碱性硅酸盐溶液中的特定作用，因此几乎没有进行研究。在这项研究中，首次评估了硅酸钠溶液的Hammet酸度功能。与纯氢氧化钠溶液相比，这些溶液中发现的低酸度功能值已通过使用液态29Si NMR的硅酸盐物质的缓冲作用得到了解释。然后，该参数已用于量化在将碱金属硅酸盐溶液与偏高岭土混合期间反应的氢氧根离子的能力。尽管与不含硅酸盐的溶液相比，当量氢氧化钠的初始酸度函数值较低，但已证明所研究的偏高岭土在存在硅酸盐物质时的溶解效率更高。这种现象归因于在偏高岭土溶解过程中由于硅酸盐物质缩合而逐渐释放出氢氧根离子。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号