Scholarlink

<p>The effect of complex geothermal water composition in comparison with that of a single NaCl solution was studied on cement pastes prepared by partial substitution of cement with silica fume and metakaolin in different proportions. After 90&#xa0;days of hydration in solutions or water, TGA, XRD, FTIR, ion chromatography, SEM, volume change, and compressive strength (CS) measurements were used to evaluate the impact of solutions on the systems. Higher Al<sup>3+</sup> content in blended samples resulted in a greater ability to bind chlorides in Cl–AFm. A lower amount of free Cl<sup>−</sup> restrained delayed ettringite formation. Less significant volume changes together with the formation of C–(A–)S–H phases promoted by both solutions led to lower porosities and higher CSs than those of referential paste. NaCl solution showed a bigger negative influence than the geothermal one.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Chloride and combined chemical attack of saline solutions on modified oil well cement pastes

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年6月30日

查看全文
  • Kristína Compeľová,
  • Taher A. Tawfik,
  • Lenka Buňová,
  • Michal Slaný,
  • Jiří Másilko,
  • Eva Kuzielová

摘要

The effect of complex geothermal water composition in comparison with that of a single NaCl solution was studied on cement pastes prepared by partial substitution of cement with silica fume and metakaolin in different proportions. After 90 days of hydration in solutions or water, TGA, XRD, FTIR, ion chromatography, SEM, volume change, and compressive strength (CS) measurements were used to evaluate the impact of solutions on the systems. Higher Al3+ content in blended samples resulted in a greater ability to bind chlorides in Cl–AFm. A lower amount of free Cl− restrained delayed ettringite formation. Less significant volume changes together with the formation of C–(A–)S–H phases promoted by both solutions led to lower porosities and higher CSs than those of referential paste. NaCl solution showed a bigger negative influence than the geothermal one.