硅酸盐学报2018，Vol.46Issue(2)：193-205,13.DOI:10.14062/j.issn.0454-5648.2018.02.06
不同有效碱含量下纳米氧化铝对水泥石固、液相组成的影响
Influence of Alumina Nano-Particles on Pore Solution and Solid Phase of Cement Paste at Different Equivalent Alkali Contents
摘要
Abstract
This paper reports the influence of alumina nano-particles on the compositions of pore solution and solid phases of cement paste at different alkali contents (Na2Oeq: 0.58％ and Na2Oeq: 1.25％ by mass of cement). At a low alkali content (i.e., Na2Oeq: 0.58％), alumina nano-particles dissolve and release Al species into the pore solution due to the formation of the more monosulfate, leading to a decreased S concentration in the pore solution. The formed monosulfate can transform into more stable AFm (calcium silicate hydrate) phases, such as monocarbonate and hemicarbonate. The concentration of Al in pore solution is controlled by the solubility of AFm phases, and the presence of 3％ alumina nano-particles (by mass of cement) only causes a slightly increase in Al concentration in pore solution. At a high alkali content in cement (i.e., Na2Oeq: 1.25％), the increase of alkalinity increases the solubility of ettringite and AFm phases, and reduces the saturation degree of these phases. The increased solubility of ettringite and AFm phases leads to increases in Al and S concentrations simultaneously in pore solution, especially at latter ages. In this case, the solubility of AFm phases is still a factor controlling Al species concentration in pore solution.关键词
纳米氧化铝/孔溶液/水泥石/水化硅酸钙Key words
nano-alumina/pore solution/cement paste/calcium silicate hydrate分类
化学化工引用本文复制引用
周学进,郑克仁,周瑾..不同有效碱含量下纳米氧化铝对水泥石固、液相组成的影响[J].硅酸盐学报,2018,46(2):193-205,13.基金项目
自然科学基金项目(51578551 （）
U1534207). （）
