Modeling of damage in cement paste subject to external sulfate attack
Modeling of damage in cement paste subject to external sulfate attack
复制标题
模拟受到外部硫酸盐侵蚀的水泥浆体的损坏
DOI：
10.12989/cac.2015.16.6.847
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发表时间：
2015-12
影响因子：
4.1
通讯作者：
Hongqiang Chu
中科院分区：
文献类型：
--
作者：
Chuansheng Xiong（博士生）;Linhua Jiang;Yan Zhang;Hongqiang Chu
本研究旨在建立硫酸盐在水泥浆体中的扩散模型和钙矾石含量分布模型，以预测硫酸盐对水泥浆体的损伤行为。模型考虑了孔隙溶液中离子与固体铝酸钙相之间的多相反应平衡以及水泥浆体不同部位的微观结构变化。基于钙矾石含量剖面模型，计算了水泥石的膨胀体积应变和膨胀应力的分布。此外，还进行了大量的硫酸盐扩散试验和SEM分析，以验证模型的可靠性和准确性。结果表明，数值模拟结果与实验结果有很好的相关性。结果表明，水灰比对水泥石中硫酸根离子的扩散、钙矾石浓度分布和膨胀性能有显著影响。采用数值方法预测了水泥石中钙矾石生长引起的开裂点。模拟结果表明，高水灰比或高浓度硫酸盐溶液对水泥石的破坏有促进作用。
This study aimed to develop models of sulfate diffusion and ettringite content profile in cement paste for the predication of the damage behavior in cement paste subject to external sulfate. In the models, multiphase reaction equilibrium between ions in pore solution and solid calcium aluminates phases and the microstructure changes in different positions of cement paste were taken into account. The distributions of expansive volume strain and expansion stress in cement paste were calculated based on the ettringite content profile model. In addition, more sulfate diffusion tests and SEM analyses were determined to verify the reliability and veracity of the models. As the results shown, there was a good correlation between the numerical simulation results and experimental evidences. The results indicated that the water to cement ratio (w/c) had a significant influence on the diffusion of sulfate ions, ettringite concentration profile and expansion properties in cement paste specimens. The cracking points caused by ettringite growth in cement paste specimens were predicted through numerical methods. According to the simulation results, the fracture of cement paste would be accelerated when the specimens were prepared with higher w/c or when they were exposed to sulfate solution with higher concentration.
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影响因子：
10.5
作者：
P. Gospodinov;R. Kazandjiev;M. Mironova
通讯作者：
P. Gospodinov;R. Kazandjiev;M. Mironova
考虑多相反应和离子相互作用，对浸泡在 CaCl2 和 NaCl 溶液中的混凝土中氯离子扩散进行建模
影响因子：
7.4
作者：
Chu, Hongqiang;Xiong, Chuansheng;Liu, Rong;You, Lushen
通讯作者：
You, Lushen
DOI：
10.1016/s1570-7946(07)80049-6
发表时间：
2007
期刊：
Computer-aided chemical engineering
影响因子：
--
作者：
P. Koukkari;R. Pajarre
通讯作者：
P. Koukkari;R. Pajarre
影响因子：
10.5
作者：
Bary, Benoit;Leterrier, Nikos;Le Bescop, Patrick
通讯作者：
Le Bescop, Patrick
影响因子：
4.5
作者：
GARBOCZI, EJ;BENTZ, DP
通讯作者：
BENTZ, DP