| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5436762 | Cement and Concrete Composites | 2017 | 10 Pages |
Abstract
This study aims to investigate the time-dependent characteristics of sodium carbonate activated slag at the early stage and its compressive strength development. The reaction kinetics of Na2CO3 activated slag is analyzed at the curing ages of 1h, 6h, 1d, 2d, 3d, 4d and 7d, respectively, and the reaction products are characterized employing FTIR, XRD, TG-DTG and SEM. The results show that a weak reflection of gaylussite is observed after 1Â d of curing, while intensive accumulation of gaylussite and formation of hydrotalcite are observed at 2Â d/3Â d. Meanwhile, the gelation of C-(A)SH after 3Â d of curing is identified by FTIR. The role of pH, CO32â anion concentration and the formation of crystals such as gaylussite and hydrotalcite on the reaction process are discussed. In addition, a relationship between the initial alkali concentration and compressive strength at different curing ages of 7Â d, 28Â d and 180Â d is derived.
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Authors
B. Yuan, Q.L. Yu, H.J.H. Brouwers,