碱激发胶凝材料抗硫酸盐侵蚀机理的探讨  

Discussion on the Mechanism of the Resistance of Alkali-Activated Cementing Material to External Sulfate Attack

作　　者：郑娟荣[1] 杨长利[1] 陈有志[1] 

机构地区：[1]郑州大学土木工程学院,河南郑州450001

出　　处：《郑州大学学报（工学版）》2012年第3期1-4,共4页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(50572096)

摘　　要：对碱-矿渣、碱-粉煤灰、碱-偏高岭土和普通硅酸盐水泥的抗硫酸盐侵蚀机理进行了探讨,其中用普通硅酸盐水泥作为对比样.采用实验室加速试验法(即干湿循环法),并对侵蚀后的碱激发胶凝材料的产物进行X射线衍射(XRD)分析.结果表明:在5%的硫酸钠溶液中,碱激发胶凝材料砂浆主要是由于环境中硫酸钠溶液浸入试块孔隙中,使盐结晶产生体积膨胀而破坏,而普通硅酸盐水泥砂浆主要是由于生成膨胀性产物石膏和硫酸钠盐结晶而破坏.This paper discusses on the mechanism of the resistance of alkali-activated slag, alkali-activated fly-ash, alkali-activated metakaolinite and ordinary Portland cement used as control sample to external sulfate attack. Accelerated test method （i. e. cycles of wetting and drying ） and X-ray diffraction （XRD） analysis of the products of alkali-activated cementing materials after external sulfate attack were used in this paper. It draws a conclusion that alkali-activated cementing material mortars are broken because of volume expansion produced external sodium sulfate salt-crystallization in the pore of the mortars, while ordinary Portland cement mortar is broken because of forming gypsum and external sodium sulfate salt-crystallization with volume expansion in sodium sulfate solution of 5% concentration.

关 键 词：碱激发胶凝材料 硫酸盐侵蚀 干湿循环 X射线衍射分析 硫酸钠盐结晶 

分 类 号：TQ172[化学工程—水泥工业]