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。
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 1 day, 2 days and 3 days after I 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.
出处
《低温建筑技术》
2007年第3期1-3,共3页
Low Temperature Architecture Technology
基金
国家自然科学基金资助项目(50508005)
