硅酸盐学报2017，Vol.45Issue(8)：1088-1095,8.DOI:10.14062/j.issn.0454-5648.2017.08.06
活性与养护温度对氧化镁膨胀剂膨胀性能的影响
Influence of Chemical Activity and Curing Temperature on Expansion Properties of Magnesium Oxide Expansive Agents
摘要
Abstract
The hydration products and expansion characteristics of MgO expansive agents(MEA) with different chemical activities at different hydration ages and temperatures were investigated by X-ray diffraction and scanning electron microscopy.The restricted expansion rate and mechanical properties of shrinkage-compensating mortar containing 6％ MEA were determined.The hydration process,expansion properties and mechanism of MEA were discussed.The results indicate that a high hydration activity of MEA reduces the volume of brucite crystals and its expansive ability decreases.Alkaline environment in the Portland cement paste hinders the hydration of MEA.Elevated temperature curing contributes to the in-situ formation and compaction of brucite crystals,hence enhancing the expansion of MgO expansive agents.关键词
氧化镁/膨胀剂/温度/限制膨胀率/水化/作用机理Key words
magnesium oxide/expansive agent/temperature/restricted expansion rate/hydration/mechanism分类
化学化工引用本文复制引用
曹丰泽,阎培渝..活性与养护温度对氧化镁膨胀剂膨胀性能的影响[J].硅酸盐学报,2017,45(8):1088-1095,8.基金项目
国家自然科学基金项目(No.51678344). （No.51678344）
