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Título: | Durability of Ternary Cements Based on New Supplementary Cementitious Materials from Industrial Waste |
Autor: | Sáez del Bosque, I.F.; Sánchez de Rojas, María Isabel CSIC ORCID; Medina, Gabriel; Barcala, Sara; Medina, César | Palabras clave: | biomass ash construction and demolition waste Supplementary cementitious materials corrosion index cement pastes durability |
Fecha de publicación: | 27-jun-2021 | Editor: | Multidisciplinary Digital Publishing Institute | Citación: | Applied Sciences 11: 1- 16 (2021) | Resumen: | Cement-based materials decay with exposure to aggressive agents, a development that raises infrastructure operation and maintenance costs substantially. This paper analyses the inclusion of ultrafine construction and demolition (UC&DW) and biomass-fuelled power plant (BA) waste as pozzolanic additions to cement in pursuit of more sustainable and eco-respectful binders and assesses the durability of the end materials when exposed to seawater, chlorides (0.5 M NaCl) or sulphates (0.3 M Na2SO4). The effect of adding silica fume (SF) at a replacement ratio of 5% was also analysed. Durability was determined using the methodology proposed by Koch and Steinegger, whilst microstructural changes were monitored with mercury intrusion porosimetry (MIP), X-ray diffraction (XRD) and scanning electron microscopy (SEM) for a fuller understanding of decay processes. According to the findings, the new blended cements containing 20%UC&DW + 10%BA or 20%UC&DW + 20%BA + 5%SF resist the attack by the aggressive media studied, with a 56-d corrosion index of over 0.7. The composition of the reaction products generated with the attack is essentially the same in OPC and the SCM-bearing materials. The results show that the optimal replacement ratio for SCM is 30% | Versión del editor: | http://dx.doi.org/10.3390/app11135977 | URI: | http://hdl.handle.net/10261/258350 | DOI: | 10.3390/app11135977 | Identificadores: | doi: 10.3390/app11135977 issn: 1454-5101 |
Aparece en las colecciones: | (IETCC) Artículos |
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Durability of Ternary Cements.pdf | 6,65 MB | Adobe PDF | Visualizar/Abrir |
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