【摘要】 通过扫描电镜、EDS微区元素点分析及X-射线衍射等试验,对200MPa级的活性粉末混凝土的微观机理进行了研究。标准养护1d后生成小颗粒梭状的C-S-H凝胶体与六方板状的Ca(OH)2晶体,内部结构显得比较疏松,且Ca(OH)2晶体的结晶能力下降,形成的晶体颗粒偏小偏薄。标准养护1d后,高温养护1、2、3d的水化产物凝胶体的形状以梭状的小颗粒C-S-H凝胶——蠕虫状C-S-H凝胶颗粒——“云状”C-S-H凝胶颗粒簇——表面平滑饱满大颗粒——密实块状体的顺序发生变化。C-S-H凝胶体的Ca/Si由3.75降至1.75。低水胶比条件下不产生AFt晶体。更多还原

【Abstract】 In this paper,electron microscopy,analysis of element in EDS micro-district and X-ray diffraction were carried to study the micro-mechanism of RPC,the compressive strength of which can reach 200MPa.It was found that,after 1 day’s standard curing,it react to form the spindle-shaped fine particles of C-S-H gel and hexagonal tabular crystal of Ca(OH)2,the internal structure is porous.In addition,the ability of Ca(OH)2 ’s crystallization is weakened,and crystal particles of Ca(OH)2 are a little small and thin.When cured at high temperature l day,2 days and 3 days after l day’s standard curing,the products resulted from hydration are turning into spindle-shaped fine particles,vermiculate particles,cloudy cluster of particle,plump big particles of smooth surface,dense blocks in turn,and the ratio of Ca to Si in C-S-H gel is from 3.75 descends to 1.75.No crystal of AFt is produced when water-binder ratio is low.更多还原