[1]张彩虹,宋志刚,毛敏,等.水泥砂浆受硫酸溶蚀的试验研究和数值模拟[J].自然灾害学报,2021,30(03):112-121.[doi:10.13577/j.jnd.2021.0313]
 ZHANG Caihong,SONG Zhigang,MAO Min,et al.Experimental study and numerical simulation on cement mortar corroded by sulfuric acid[J].,2021,30(03):112-121.[doi:10.13577/j.jnd.2021.0313]
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水泥砂浆受硫酸溶蚀的试验研究和数值模拟
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
30
期数:
2021年03期
页码:
112-121
栏目:
出版日期:
2021-06-28

文章信息/Info

Title:
Experimental study and numerical simulation on cement mortar corroded by sulfuric acid
作者:
张彩虹 宋志刚 毛敏 谢世华
昆明理工大学 建筑工程学院, 云南 昆明 650500
Author(s):
ZHANG Caihong SONG Zhigang MAO Min XIE Shihua
Institute of Architecture Engineering, Kunming University of Science & Technology, Kunming 650500, China
关键词:
水泥砂浆硫酸钙溶蚀数值模拟有限差分法
Keywords:
cement mortarsulfuric acidcalcium leachingnumerical simulationfinite difference method
分类号:
TU528.01;X9
DOI:
10.13577/j.jnd.2021.0313
摘要:
为研究硫酸作用方式对水泥砂浆溶蚀速度的影响,开展了水胶比为0.4的水泥砂浆试件在pH=4.0的硫酸溶液中的浸泡试验,浸泡过程中按是否更换浸泡液、是否进行试件表面清洗确定了三种控制条件,试验获得了试件耗酸量随浸泡时间的变化曲线。在试验基础上进行了数值模拟,基于钙溶蚀偏微分方程,构造了一种无条件稳定的隐式差分格式,引入了浓度剖面修正方法模拟试验中的清洗过程,模拟了不同条件下水泥砂浆试件的溶蚀过程,得到试件模拟耗酸量曲线并与实测值进行了对比。结果表明:模拟值与试验值基本一致,验证了钙溶蚀模型的可靠性;试验控制条件会影响试件耗酸速度,浸泡结束时刻,仅更换浸泡液和既更换浸泡液又清洗试件表面的试验条件分别会使试件耗酸量增加33%和45%。
Abstract:
In order to study the effect of sulfuric acid action on the dissolution rate of cement mortar, the immersion test of cement mortar specimens with a water-binder ratio of 0.4 in a sulfuric acid solution with pH=4.0 was carried out. During the immersion process, whether to replace the soaking fluid and whether to conduct the test specimens three control conditions were determined for surface cleaning, and the curve of acid consumption of the test piece with the immersion time was obtained in the experiment. Numerical simulations were carried out on the basis of the test. Based on the partial differential equation of calcium dissolution, an unconditionally stable implicit difference scheme was constructed. The concentration profile correction method was introduced to simulate the cleaning process in the test, and the cement mortar specimens under different conditions were simulated. During the dissolution process, the simulated acid consumption curve of the test piece was obtained and compared with the measured value. The results show that the simulation value is basically the same as the test value, which verifies the reliability of the calcium dissolution model, and the test control conditions will affect the acid consumption rate of the test piece. At the end of the immersion, only the soaking solution is replaced and the soaking solution is replaced and the surface of the test piece is cleaned. The test conditions will increase the acid consumption of the test piece by 33% and 45% respectively.

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相似文献/References:

[1]何峰,黄政宇,易伟建.活性粉末混凝土的耐酸性[J].自然灾害学报,2011,20(02):044.
 HE Feng,HUANG Zheng-yu,YI Wei-jian.Acid-resistance performance of reactive powder concrete[J].,2011,20(03):044.

备注/Memo

备注/Memo:
收稿日期:2020-10-28;改回日期:2020-12-28。
基金项目:国家自然科学基金项目(51078175)
作者简介:张彩虹(1995-),女,硕士研究生,主要从事混凝土结构耐久性方面研究.E-mail:577204885@qq.com
通讯作者:宋志刚(1974-),男,教授,博士生导师,主要从事工程振动、混凝土耐久性、建筑防火方面研究.E-mail:Zhigang-s@163.com
更新日期/Last Update: 1900-01-01