NUMERICAL ANALYSIS FOR MORTAR DEGRADATED BY SULFATE ACID ATTACK CONSIDERING INFLUENCES OF ETTRINGITE AND GYPSUM

NUMERICAL ANALYSIS FOR MORTAR DEGRADATED BY SULFATE ACID ATTACK CONSIDERING INFLUENCES OF ETTRINGITE AND GYPSUM
复制标题

考虑钙矾石和石膏影响的硫酸侵蚀砂浆数值分析

DOI:
10.14250/cement.67.216
复制
发表时间:
2013
期刊:
Cement Science and Concrete Technology
影响因子:
--
通讯作者:
Yasuhiko Sato
Yasuhiko Sato
中科院分区:
--
文献类型:
--
作者:
T. Miura;Yasuhiko Sato

文献摘要

被引文献

相似文献

The purpose of this study is to develop the analytical method which can evaluate the change in physico-chemical property of mortar immersed in sulfuric acid solution. In this analytical approach, influences of sulfate acid attack were considered by diffusivity change of sulfate ions and physical change caused by chemical reaction of cement hydrate with sulfate ions. In the analysis, deposition condition of ettringite and gypsum was given by pH value and porosity which were calculated by the change in cement hydrate based on the experimental results. Finally, the validity of the analysis was discussed through parametric analyses in which the porosity value was varied.本研究は、硫酸溶液に浸漬したモルタルの物理化学的性質の経時変化を評価可能な解析手法を提案するものである。本解析手法では、硫酸による劣化を硫酸イオンの拡散および硫酸イオンと水和物との反応によってモデル化するとともに、pHを閾値としたエトリンガイトと二水セッコウの析出条件を導入した。また、実験値から回帰的にモルタル中の水和物量を求めることで、水和物量と析出物量に伴う固体体積の増減から空隙率を算出した。最終的に、空隙率の変化量を変数としたパラメトリック解析を行い、本解析手法の妥当性を検討した。