Evaluation of the combined addition of aluminum lactate and calcium carbonate to alumina-based castables
| Autor: | A. P. da Luz, L. B. Consonni, Victor C. Pandolfelli |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Cement
sintering Materials science Aluminate Sintering chemistry.chemical_element Calcium calcium aluminate cement aluminum lactate Engineering (General). Civil engineering (General) alumina refractory castables chemistry.chemical_compound Calcium carbonate chemistry Flexural strength Carbon dioxide Ceramics and Composites calcium carbonate Composite material TA1-2040 Elastic modulus |
| Zdroj: | Cerâmica, Volume: 67, Issue: 382, Pages: 196-202, Published: 17 MAY 2021 Cerâmica, Vol 67, Iss 382, Pp 196-202 (2021) Cerâmica v.67 n.382 2021 Cerâmica (São Paulo. Online) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Calcium aluminate cement (CAC) can induce the development of high green mechanical strength to refractory castables in a short period of time (24 h). However, the production of this hydraulic binder is energy-intensive and releases a large content of carbon dioxide (CO2), which adds to global warming. Thus, aiming to develop an alternative binding system, this study investigated the combined addition of aluminum lactate (0.25-1.0 wt%) and calcium carbonate (3.2 wt%) to alumina castables. The prepared samples were analyzed using different experimental techniques, such as cold and hot modulus of rupture, hot elastic modulus, X-ray diffraction, and apparent porosity. According to the results, the lactate addition to the castables improved their green mechanical strength after drying at 110 °C/24 h (4.89 MPa) when compared to the one containing plain calcium carbonate (1.72 MPa). Furthermore, the carbonate-containing refractories presented cold and hot modulus of rupture similar or even superior to the castable containing cement in a wide temperature range (600-1500 °C). |
| Databáze: | OpenAIRE |
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