摘要
通过海砂混凝土中游离氯离子含量的测定,研究了海砂混凝土氯离子吸附和结合特征。利用X射线衍射、扫描电镜和热分析等测试方法对海砂混凝土的微结构和Friedel盐进行了表征。结果表明:海砂混凝土游离氯离子浓度与溶液的萃取温度密切相关,温度越高,游离氯离子浓度越大,萃取温度为65℃时的游离氯离子浓度约为15℃时游离氯离子浓度的2倍;同时粉煤灰砂浆中结合的物理固化离子在较低温度下溶出率低。TG/DTA曲线上没有出现海砂混凝土的Friedel盐吸热峰,而XRD与SEM图中显示海砂混凝土中存在Friedel盐,可能是因为Friedel盐含量较少,导致生成的Friedel盐不稳定。
The adsorption and binding mechanisms of chloride ion were studied through measuring the water-so- luble chlorine ion content in the sea sand concrete. The effect of extracting temperatures on water soluble chloride ion concentration in sea sand concrete was also studied. In addition, the microstructure, Friedel salt were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and thermal analysis methods （TG/DTA）. The re- sults show that water soluble chloride ion concentration in sea sand concrete is closely related to the extracting tempe- rature. The higher temperature was, the higher the water soluble chloride ion concentration was. When extraction temperature is 65 ~C, the water soluble chloride ion concentration is about two times as that is 15 ~C. Physical combi- nation of chloride ion in fly ash mortar shows low dissolution in lower temperatures. TG/DTA curve does not appear endothermic peak on the Friedel salt in sea sand concrete, while the XRD and SEM picture can be determined to have more Friedel salt be generated in the sea sand. Probably because Friedel salt is generated little, leading to make Friedel salt instability.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2013年第20期129-132,共4页
Materials Reports
基金
国家自然科学基金(51078189
51278255)
宁波大学学科项目(SZX11062)
浙江省新苗人才计划(2013R405071)
