Mechanical properties e life cycle assessment of ultra-high performance concretes produced with rice husk ash
DOI:
https://doi.org/10.46421/enarc.v9i1.7406Keywords:
UHPC, RICE HUSK ASH, Life Cycle Assessment, SustainabilityAbstract
The construction industry is one of the main contributors to environmental impacts, especially due to CO₂ emissions from cement production. Ultra-High Performance Concrete (UHPC), despite its excellent mechanical properties, requires high cement consumption (over 800 kg/m³), limiting its sustainability. This study proposed the partial replacement of cement with Rice Husk Ash (RHA) in UHPC, with replacement rates of up to 60%. Compression and flexural strength tests were performed, along with a Life Cycle Assessment (LCA). The results showed that replacing 20% of cement with RHA increased compressive strength, while higher replacement rates (40% and 60%) reduced strength by up to 12%. The LCA indicated reductions of up to 50% in CO₂ emissions. It is concluded that RHA is a viable alternative for producing more sustainable UHPC, even at high replacement rates.
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