Microstructure of Carbonation-Activated Steel Slag Binder
Why this work is in the frame
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Bibliographic record
Abstract
A steel slag material demonstrated rapid hardening and a considerable gain in compressive strength upon reacting with carbon dioxide. Two-hour carbonated paste compacts achieved an average compressive strength of 80 MPa, warranting the slag’s consideration as a cement-like binder for building applications. The microstructure of this CO2-activated binder system was examined. The reaction was found to engage the di-calcium-silicate component of the slag to generate a hardened matrix consisting of CaCO3 and a low-lime calcium-silicate-hydrate (C─ S─ H) phase. The latter differed in composition and structure from C─ S─ H variants generated from normal portland cement hydration. Raman spectroscopy confirmed bands (330, 510–550, 600–630, and 1,005 cm−1) consistent with C─ S─ H species having low-lime compositions. High-resolution transmission electron microscope (TEM) resolved lamellar features for C─ S─ H with short basal spacings (averaging 0.73 nm), correlatively indicating superior interlayer cohesion. Moreover, abundant nano-CaCO3 crystals were found interlocked within the C─ S─ H phase, forming a dense nanoscale composite matrix. Such a proposed binder system is completely by-product-sourced, thus presenting the potential of eliminating or significantly reducing the carbon footprint of building products.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it