氧化镁膨胀剂的研究现状.pdfVIP

膨胀剂与膨胀混凝土 Expansive Agents Expansive Concrete 氧化镁膨胀剂的研究现状 莫立武 邓敏 南京工业大学材料学院材料化学工程国家重点实验室 南京 ( , , 210009) 摘 要 与以钙矾石作为膨胀源的传统的膨胀剂相比 膨胀剂具有水化需水量少 膨胀过程可调控 水 ， 、 、 [ ] MgO 化产物稳定的优点 适用于补偿大体积混凝土温降收缩 混凝土自收缩和干燥收缩 可广泛应用于水工建筑 机 ， 、 ， 、 场道面 公路 地下工程等 本文着重介绍了目前关于 膨胀剂的膨胀机理 膨胀性能 工业化生产 安定性 、 、 。 MgO 、 、 、 评估 工程应用等方面的现状 在此基础上提出了当前关于 膨胀剂的研究应用过程中所急需解决的问题 、 。 MgO 和研究方向。 关键词 氧化镁膨胀剂膨胀机理膨胀性能工业化生产安定性 [ ] [Abstract] Compared to the traditional expansive agents for which the expansion results from the formation of et- tringite, many advantages of MgO-based expansive agent (MEA) exist, such as lower requirement of water for hydra- tion, designable expansion properties and physical-chemistry stable hydration products. MEA could be used not only in compensating the thermal shrinkage of massive concrete, but also in compensating the autogenous shrinkage and drying shrinkage of concrete. It could be used in the hydraulic buildings, concrete pavement, underground building and so on. The expansion mechanism, expansion properties, industrial production, soundness evaluation and the appli- cation of MEA were summarized in this paper. The problems existed about the research and application of MEA were also discussed.