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氧化石墨烯对水泥水化进程及其主要水化产物的影响
作者: 琴1 李时雨1  健1  硕1 郭紫薇1 吕春祥2 
单位:1. 北京建筑大学土木与交通工程学院 北京市结构工程与环境修复材料重点实验室 北京 100044  2. 中国科学院山西煤炭化学研究所碳纤维制备技术国家工程实验室 太原 030001 
关键词:氧化石墨烯 水泥水化 晶体氢氧化钙 孔结构 
分类号:TQ172
出版年,卷(期):页码:2018,46(2):163-172
DOI:
摘要:

研究了氧化石墨烯(GO)对水泥水化进程及其主要水化产物氢氧化钙(CH)、水化硅酸钙凝胶(C-S-H)的影响。采用原子力显微镜、透射电镜等对所用GO进行了表征,采用水化热、X射线衍射分析以及热重分析等方法对不同GO掺量的新拌水泥浆体水化程度以及水化产物含量等进行了测量。结果表明:GO的掺入对水泥水化进程并无明显影响,即GO并不存在促进水化的作用,但是GO的掺入可以影响水化产物尤其是氢氧化钙的结晶过程和形态;GO对水泥浆体硬化后形成的凝胶孔特征有重要影响,随着GO掺量的增加,能够使凝胶孔中存有更多的自由水,并在一定程度上细化、封闭孔结构;GO的存在不仅对六方片状晶体的生成有明显抑制作用,并且能够细化晶体氢氧化钙的尺寸。

The influence of graphite oxide (GO) on the hydration of cement and its main hydration products, i.e., calcium hydroxide (CH) and hydrated calcium silicate gel (C-S-H), was investigated. The GO was characterized by atomic force microscopy, transmission electron microscopy. The hydration degree and the content of hydration products of fresh cement paste with different GO dosages (i.e., 0%, 0.01%, 0.03% and 0.05%, in mass fraction) were measured by means of hydration heat analysis, X-ray diffraction and thermogravimetric analysis. The results show that the GO has no effect on the hydration process of cement, but it can extremely affect the formation of hydration products, especially the crystallization process and morphology of calcium hydroxide. GO has an important influence on the pore characteristics of hardened cement paste. The more free water can be formed in the gel pore, and the pore structure can be refined to a certain extent when the GO content is increased. Also, the presence of graphene oxide inhibits the formation of hexagonal plates crystals, and refines the size of crystalline calcium hydroxide.

基金项目:
国家自然科学基金(51508020)。
作者简介:
王 琴(1979—),女,博士,副教授。
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