We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Influence of Ultrafine Fly Ash and Slag Powder on Microstructure and Properties of Magnesium Potassium Phosphate Cement Paste.
- Authors
Jia, Zheng; Zhang, Yuhui; Mo, Liwu
- Abstract
This study investigated the influences of ultrafine fly ash (UFA) and ultrafine slag powder (USL) on the compressive strengths, autogenous shrinkage, phase assemblage, and microstructure of magnesium potassium phosphate cement (MKPC). The findings indicate that the aluminosilicate fractions present in both ultrafine fly ash and ultrafine slag participate in the acid–base reaction of the MKPC system, resulting in a preferential formation of irregularly crystalline struvite-K incorporating Al and Si elements or amorphous aluminosilicate phosphate products. UFA addition mitigates early age autogenous shrinkage in MKPC-based materials, whereas USL exacerbates this shrinkage. In terms of the sustained mechanical strength development of the MKPC system, ultrafine fly ash is preferred over ultrafine slag powder. MKPC pastes with ultrafine fly ash show greater compressive strength compared to those with ultrafine slag powder at 180 days due to denser interfaces between the ultrafine fly ash particles and hydration products like struvite-K. The incorporation of 30 wt% ultrafine fly ash enhances compressive strengths across all testing ages.
- Subjects
FLY ash; POTASSIUM phosphates; MAGNESIUM phosphate; SLAG; CEMENT admixtures; MICROSTRUCTURE; PORTLAND cement; CEMENT; PASTE
- Publication
Materials (1996-1944), 2024, Vol 17, Issue 11, p2556
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma17112556