硅酸盐通报2025，Vol.44Issue(1)：31-39,9.DOI:10.16552/j.cnki.issn1001-1625.2024.0917
溶液全浸泡的磷酸钾镁水泥浆体中的硫酸盐侵蚀行为研究
Sulfate Corrosion Behavior in Solution Fully Soaked Magnesium Potassium Phosphate Cement Slurry
摘要
Abstract
Through macro performance test,chemical analysis and microscopic analysis,this paper studied the diffusion of sulfate ions and strength development of magnesium potassium phosphate cement(MKPC)specimens immersed in a Na2SO4 solution with a mass fraction of 5％.The results show that with the extension of soaking age,the content of sulfate ions inside the specimens and the depth of erosion gradually increases.The relationship between the depth of erosion of sulfate ions in MKPC specimens and the sulfate ion content generally fits a second-order or third-order polynomial(with a correlation coefficient R2 greater than 0.998).By solving the analytical expression using Fick's second law of diffusion with established boundary conditions,the diffusion coefficient of sulfate ions in MKPC specimens is in the range of 10-7 mm2/s,which is one order of magnitude lower than that of Portland cement concrete.The diffusion coefficient of sulfate ions in MKPC specimens exhibits a decreasing trend for soaking age not exceeding 180 d.After more than 180 d,the diffusion coefficient of sulfate ions in MKPC specimens gradually increases.After 360 d of soaking,the diffusion coefficient of sulfate ions in MKPC specimen is 3.9 × 10-7 mm2/s,and the sulfate ion content at 2 mm from the surface is 0.218％(mass fraction).The strength of MKPC specimens increases initially and then decreases as the soaking age extends,following a similar trend to that of the diffusion coefficient of sulfate ions.After 360 d of soaking,the loss rates of flexural and compressive strength of MKPC specimens are both less than 5％.关键词
磷酸钾镁水泥/硫酸盐侵蚀/浸泡龄期/侵蚀深度/扩散系数/强度Key words
magnesium potassium phosphate cement/sulfate corrosion/soaking age/depth of erosion/diffusion coefficient/strength分类
土木建筑引用本文复制引用
侯宇颖,杨建明,徐晓晖,胡雪欣,陈为亮,胡夏闽,蒋德权,熊才强,李涛..溶液全浸泡的磷酸钾镁水泥浆体中的硫酸盐侵蚀行为研究[J].硅酸盐通报,2025,44(1):31-39,9.基金项目
国家自然科学基金面上项目(52378265) （52378265）
江苏省建设系统科技项目(2022ZD045) （2022ZD045）
2023年江苏省教育厅江苏高校"青蓝工程"资助项目 （）
江苏省教育科学规划课题(B/2023/01/54) （B/2023/01/54）
