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Study on Mineral Compositions of Direct Carbonated Steel Slag by QXRD, TG, FTIR, and XPS
| Content Provider | MDPI |
|---|---|
| Author | Wang, Xue Ni, Wen Li, Jiajie Zhang, Siqi Li, Keqing |
| Copyright Year | 2021 |
| Description | Steel slag $CO_{2}$ sequestration helps mitigate global warming and decrease the stockpile of steel slag (SS). Through orthogonal design tests and single-factor tests, this paper evaluated the effects of the water/solid mass ratio (w/s), gypsum ratio (G/SS), molding pressure, and curing duration on uniaxial compressive strength (UCS) and $CO_{2}$ uptake of the compacts. The results indicated that high w/s enhanced both strength and $CO_{2}$ capture ability. The proper addition of gypsum helps promote UCS increase and $CO_{2}$ uptake of steel slag. In addition, increasing the molding pressure can significantly improve UCS without reducing $CO_{2}$ uptake. The optimum conditions in the study were a w/s of 0.20, G/SS of 1/16, and molding pressure of 27 MPa, under which conditions 1 d UCS and $CO_{2}$ uptake were 55.30 MPa and 12.36%, respectively. Microanalyses showed that gypsum activates mainly mayenite in steel slag. An increase in water addition also increased the hydration and carbonation products greatly, and the strengthened molding pressure had a significant densification effect on micro-pore structures. The study gives guidance in the application of steel slag in $CO_{2}$ capture and manufacturing green construction material. |
| Starting Page | 4489 |
| e-ISSN | 19961073 |
| DOI | 10.3390/en14154489 |
| Journal | Energies |
| Issue Number | 15 |
| Volume Number | 14 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-07-24 |
| Access Restriction | Open |
| Subject Keyword | Energies Environmental Engineering Carbon Capture Orthogonal Test Design Gypsum Steel Slag Ucs Xps |
| Content Type | Text |
| Resource Type | Article |
