基于SO42-吸附与反应的硬化水泥基材料中Cl-传输与固化机制  

Cl- Transport and Solidification Mechanism in Hardened Cement-based Materials Based on SO42- Adsorption and Reaction

作　　者：周莹 石亮 穆松 ZHOU Ying;SHI Liang;MU Song(State Key Laboratory of High Performance Civil Engineering Materials,Nanjing 210008;Jiangsu Sobute New Materials Co.,Ltd.,Nanjing 211103;Shanghai Suke Building Technology Development Co.,Ltd,201399)

机构地区：[1]高性能土木工程材料国家重点实验室,南京210008 [2]江苏苏博特新材料股份有限公司,南京211103 [3]上海苏科建筑技术发展有限公司,201399

出　　处：《混凝土与水泥制品》2020年第1期11-15,共5页China Concrete and Cement Products

基　　金：国家重点研发计划(2017YFB0309904);国家重点基础研究发展计划(973)资助(2015CB655105);江苏省自然科学基金资助(BK20161101、BK20160104、BK20171111、BK20181127);中国电力工程顾问集团有限公司科技项目(DG1-T02-2017);中国铁路总公司科技项目(2017G007-C);工程项目(ZXGS-KJ-01);国家自然科学基金:NSFC-山东联合基金(U1706222);江苏省重点研发计划课题(BE2017158)

摘　　要：通过自行设计的离子空间传输试验装置,分析研究了硫酸盐和氯盐的空间传输性能,并通过测试硫酸盐和氯盐共存时产物的组成和形貌,分析硫酸根离子对氯离子固化行为的影响。结果表明,在SO42-与Cl-共存的情况下,Cl-在不同时间和空间传输量较纯溶液时均有减小,说明SO42-会阻碍Cl-的传输;SO42-与Cl-均可与水泥基材料的水化产物发生反应,其中SO42-反应生成AFt,Cl-反应生成Friedel盐,当两者共存时,Friedel盐生成量减少,说明SO42-会减弱Cl-的固化能力,从而减弱混凝土结构中氯盐的腐蚀破坏程度。The space transport properties of sulfate and chloride salts were analyzed by self-designed ion space transfer test device. The composition and morphology of the products in the coexistence of sulfate and chloride salts were tested to analyze the curing behavior of sulfate ions against chloride ions. The results show that in the case of coexistence of SO42-and Cl-, Cl-decreases in different time and space than pure solution, indicating that SO42-will hinder the transport of Cl-. Both SO42-and Cl-can react with the hydration products of cement-based materials, in which SO42-reacts to form AFt, and Cl-reacts to form Friedel′s salt. When the two coexist, the amount of Friedel′s salt is reduced, indicating that SO42-will weaken the curing ability of Cl-, thereby weakening concrete. The degree of corrosion damage of chloride salts in the structure.

关 键 词：水泥基材料 硫酸盐 氯盐 传输 固化 

分 类 号：TU528.45[建筑科学—建筑技术科学]