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Durability of Ternary Cements Based on New Supplementary Cementitious Materials from Industrial Waste
| Content Provider | MDPI |
|---|---|
| Author | Bosque, Isabel Sáez del de Rojas, María Sánchez Medina, Gabriel Barcala, Sara Medina, César |
| Copyright Year | 2021 |
| Description | 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 $(U_{C&DW}$) 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 $Na_{2}SO_{4}$). 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 $20%U_{C&DW}$ + 10%BA or $20%U_{C&DW}$ + 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%. |
| Starting Page | 5977 |
| e-ISSN | 20763417 |
| DOI | 10.3390/app11135977 |
| Journal | Applied Sciences |
| Issue Number | 13 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-06-27 |
| Access Restriction | Open |
| Subject Keyword | Applied Sciences Characterization and Testing of Materials Biomass Ash Construction and Demolition Waste Supplementary Cementitious Materials Corrosion Index Cement Pastes Durability |
| Content Type | Text |
| Resource Type | Article |
