氧化镁在不同养护条件下水化产物的形貌分析  

Morphology of MgO Hydration Products under Different Curing Conditions

作　　者：高培伟[1] 吴胜兴[2] 林萍华[2] 吴中如[2] 唐明述[3] 

机构地区：[1]南京航空航天大学土木工程系,南京210016 [2]河海大学土木工程学院,南京210098 [3]南京工业大学材料学院,南京210009

出　　处：《无机化学学报》2007年第6期1063-1068,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.60672166);"973"国家重点基金(No.2001CB61070503)联合资助。

摘　　要：水镁石通常是经过氧化镁水化而形成的一种层状结构氢氧化物．其晶格常数接近天然的方镁石．密度为3．56～3．65g·cm^-3。由于形成条件、颗粒大小和形状的差异．水镁石的差热分析显示水镁石脱水温度略有不同．通常在350～450℃有一较大的吸热谷。常见的水镁石构造有球状、块状或纤维状，The morphologies of brucite formed from MgO hydration under different curing conditions were studied. The results showed that there were relations between the morphologies of brucite and its forming conditions. The size of brucite crystals increased with the curing time, and they were fiber-shaped at lower curing temperature and stick-shaped at higher temperature. When MgO was cured in paste with 10 percent cement, the crystal of brucite was fiber-shaped, while cured in paste with 95 percent cement, the crystal was hexaflaggyshaped, which aggregated and produced At 180 ℃ autoclaving temperature some micro-cracks in paste when the curing of MgO, the brucite was regular hexafiaggy- temperature was increased shaped crystal; for 216 ℃, it was less irregular. When the paste mixed with 50 percent fly ash, the crystal of brucite was needle-shaped and distributed more evenly, so decreased the deformation and crack of the concrete.

关 键 词：水镁石 形貌 微观结构 压蒸 养护龄期和温度 

分 类 号：O614.22[理学—无机化学] TQ172[理学—化学]