Ramaswamy, R., Yliniemi, J., & Illikainen, M. (2022). Dissolution-precipitation reactions of silicate mineral fibers at alkaline pH. Cement and Concrete Research, 160, 106922. https://doi.org/10.1016/j.cemconres.2022.106922
Dissolution-precipitation reactions of silicate mineral fibers at alkaline pH
|Author:||Ramaswamy, Rajeswari1; Yliniemi, Juho1; Illikainen, Mirja1|
1Fibre and Particle Engineering Research Unit, University of Oulu, P.O. Box 4300, 90014 Oulu, Finland
|Online Access:||PDF Full Text (PDF, 4.9 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2022082956592
|Publish Date:|| 2022-08-29
Silicate mineral fibers — stone (Sw) and glass wool (Gw) — are promising resources for cementitious binders. Insights gained from their dissolution kinetics under alkaline conditions can help to control the release of elements, formation of cementitious phases, and understand reactivity of similar type glasses (soda-lime and basalt). Decreasing the liquid-to-solid ratio (L/S) affects the dissolution rate of Sw, whereas the effect was lower for Gw. Residual rate observed for Sw was due to approaching equilibrium between the surface precipitates and solution chemistry. Two types of precipitation products were observed for both fibers at high pH: Mg-Al-Fe LDH and a C-N-(A-)S-H phase with a small concentration of Al. Dissolved Al was observed to incorporate more in LDH at a high L/S, whereas at a low L/S, Al incorporates more into C-N-(A-)S-H gel, altering its morphology. In addition, Ca-Ti-Si-rich globular domes, and Ca-Fe-Ti-rich nano-dome like hydrogarnets on the Sw fiber surfaces were observed.
Cement and concrete research
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
212 Civil and construction engineering
This work was funded by the European Union's Horizon 2020 project, called “Wool2loop,” under grant agreement No. 821000. Juho Yliniemi was funded by the Academy of Finland (grant # 322786). Techniques for the characterization of materials were conducted with the support of the Centre of Material Analysis, University of Oulu, Finland. Lab technicians at the Fibre and Particle Engineering Unit, Mr. Jarno Karvonen, Mr. Jani Österlund, and Elisa Wirkkala, carried out laboratory analysis and guided some of the experimental procedures. The authors would like to acknowledge the support received from the project funding and the fruitful discussions between the co-authors throughout the article writing process, and they are grateful for the help received from the lab technicians at the Centre of Material Analysis and at the Fibre and Particle Engineering Unit during the challenging period of the COVID-19 pandemic.
|EU Grant Number:||
(821000) WOOL2LOOP - Mineral wool waste back to loop with advanced sorting, pre-treatment, and alkali activation
|Academy of Finland Grant Number:||
322786 (Academy of Finland Funding decision)
© 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).