压应力对水泥硬化浆体显微结构的影响  

The Effects of Compressive Stress on the Microstructure of Hardened Cement Paste

作　　者：丁沙[1] 水中和[1] 沈春华[1] 李海飞[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《武汉理工大学学报》2008年第7期36-38,61,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50472042);教育部博士点基金(20050497010)

摘　　要：主要研究外加荷载对水泥水化产物与显微结构的影响。以水泥石1 d龄期极限压应力的30%、50%和70%对水泥石施加压力,采用X射线衍射和偏光显微镜研究不同压应力作用下水泥水化的物相、孔分布以及产物分布,结合宏观力学性能的变化,探讨了外力作用下水泥水化过程中微结构形成机理。结果表明,只有当应力达到一定临界值后水泥石的强度才出现下降;压应力没有改变水化产物的类型,但对水化产物的颗粒形貌以及颗粒分布有明显影响。The effect of compressive stress on the microstructure of hardened cement paste was investigated. X-ray diffraction and polarized light microscopy were used to research the phases and the distribution of hydrated products of cement pastes, which were hydrated under stress of 30%, 50% and 70% of 1-day ultimate compressive stress. Also, the 28 d strength was test, then, the formation mechanism of the microstructure under stress was explored. The results showed that the strength of cement paste decreased just when external stress was greater than a critical value, the category of hydrated products was not altered by the imposed compressive stress, but the morphology and distribution of the products was influenced greatly.

关 键 词：水泥水化 显微结构 水化产物形貌 

分 类 号：TB873[一般工业技术—摄影技术]