Durability of Ternary Cements Based on New Supplementary Cementitious Materials from Industrial Waste

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 add...

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Bibliographic Details
Published in:Applied sciences 2021-07, Vol.11 (13), p.5977
Main Authors: Sáez del Bosque, Isabel Fuencisla, Sánchez de Rojas, María Isabel, Medina, Gabriel, Barcala, Sara, Medina, César
Format: Article
Language:English
Subjects:
Agroforestry
Bearing materials
Binders
Biomass
biomass ash
By products
Cement
Cement hydration
cement pastes
Cements
Chemical analysis
Concrete
construction and demolition waste
corrosion index
Decay
Demolition
Durability
Industrial wastes
Maintenance costs
Masonry
Mercury
Mineralogy
Porosity
Power plants
Reaction products
Scanning electron microscopy
Seawater
Silica
Silica fume
Sodium chloride
Sodium sulfate
supplementary cementitious materials
Ultrafines
Waste materials
Water analysis
X-ray diffraction
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Summary: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%.
ISSN:2076-3417
2076-3417
DOI:10.3390/app11135977