| Title |
Hydration of High Volume Mineral Admixtures Binder with Kind of Activators |
| Authors |
Park, Cho-Bum ; Ryu, Deuk-Hyun ; Seo, Chee-Ho |
| Keywords |
High Volume Mineral Admixtures(HVMA) Binder ; Hydration Analysis ; CSA ; Anhydrous Gypsum ; Lime |
| Abstract |
As the increase of concern for global warming, high volume mineral admixtures(HVMA) concrete for the reduction of carbon dioxide which is occurred production of cement has low cement, it is reported that use of inorganic activators for increase of compressive strength. As use of high content of mineral admixtures, since the matrix is different to hydration of normal cement, it was evaluated properties of microstructure of high volume mineral admixtures paste with kind of inorganic activators. The methods of hydration analysis were micro hydrate heat, x-ray diffraction, TG-DTA and scanning electron microscope image. The hydrate properties of paste with kind of activators are as follows. At the micro heat of hydration, the peak approach time of CSA and lime were rapid, and it is judged that the setting of matrix is rapid. But anhydrous gypsum was later than plain due to sulfur trioxide. The result of XRD, it was highly observed ettringite, calcium hydroxide and mono sulfate at blended activators than use of single activator. In the TG-DTA of matrix, it was confirmed that creation of hydrate according to the change of mass by thermal gravity and change of calorie by differential thermal analysis with particular temperature. Especially, the calcium hydroxide which was disassembled at 450℃ was possible to quantitative analysis in accordance with mixtures and ages respectively. The observation result of SEM image, it was shown calcium hydroxide, ettringite, C-S-H gel, and C-A-H gel etc., but the tendency of hydrates were not clear for the reason of low cement content. Therefore, focused on result of hydrate analysis of HVMA binder with kind of inorganic activators, it was judged that the hydrate results were usefulness to basic data for mixtures design and evaluation properties of HVMA concrete hereafter. |