摘要
西部盐湖和海洋环境中存在大量的氯盐和硫酸盐,当水泥基材料处于氯盐-硫酸盐环境中,其破坏规律以及破坏机理与单一侵蚀因素作用明显不同,因此有必要探究两种盐在侵蚀过程中所呈现的交互作用。已有文献对氯盐和硫酸盐侵蚀下水泥基材料破坏规律的研究可以分为两部分:硫酸盐存在下氯盐对水泥基的侵蚀、氯盐存在下硫酸盐对水泥基的侵蚀。硫酸盐可以明显降低水化产物的氯离子结合量,因为硫酸根不仅能够分解Friedel盐,而且能先与C3A或AFm反应,抑制Friedel盐的产生。但是,氯离子扩散速率高,可以先于硫酸根离子进入水泥基材料内部与水泥水化产物反应,延缓钙矾石的产生,抑制硫酸盐的侵蚀。两种离子在向材料内部侵蚀过程中相互影响,相互牵制。最后,根据目前的研究,提出几个有意义的思考方向。
There coexist large quantities of chlorides and sulfates in both salt lake and marine environment.The failure mode and mechanism of the cement-based materials under the chloride-sulfate circumstance differ considerably from those subjected to either of the two single substances.Hence it is of great necessity to explore the interactive effect between chloride and sulfate.Previous pertinent research can be classified into two aspects:the action of sulfate with the presence of chloride,and the action of chloride with the presence of sulfate.Sulfates have been found capable of significantly reducing the amount of chloride binding,as the sulfate ions can not only decompose the Friedel’s salt,but also react with C3A or AFm to inhibit Friedel’s salt formation.On the other hand,chloride ions can penetrate into cement-based materials prior to sulfate ions and react with cement hydration products,retarding the generation of ettringite and mitigating the external sulfate attack.As for the ion attack,the two salts interact with each other and restrict each other.Finally,from the perspectives of the current study,several issues which deserve consideration and further exploration are put forward.
作者
曹园章
郭丽萍
臧文洁
张健
薛晓丽
CAO Yuanzhang;GUO Liping;ZANG Wenjie;ZHANG Jian;XUE Xiaoli(School of Materials Science and Engineering, Southeast University, Nanjing 211189;Jiangsu Key Laboratory ofConstruction Materials, Nanjing 211189;Collaborative Innovation Center for SustainableCivil Engineering Materials & Structures, Nanjing 211189)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2018年第23期4142-4149,共8页
Materials Reports
基金
国家重点研发计划(2015CB655102)
国家自然科学基金(51378113
51778133)
江苏省"六大人才高峰"B类(JZ-004)
关键词
氯盐
硫酸盐
复合盐溶液
交互作用
水泥基材料
chloride
sulfate
compound salts solution
interactive effect
cement-based materials
作者简介
曹园章:男,1991年生,硕士研究生,主要从事混凝土耐久性的研究;郭丽萍:通信作者,女,1979年生,副教授,博士研究生导师,主要从事混凝土耐久性和超高延性水泥基复合材料的研究 E-mail:guoliping619@163.com。
