Hormigón de alta resistencia con agregados naturales, humo de sílice y macrofibras de polipropileno
Resumen
El uso de hormigón con macrofibras de polipropileno puede reducir la fragilidad y la contracción de las mezclas de humo de sílice. En el presente estudio, se investiga el efecto que tienen los humos de sílice y los agregados en la mejora del hormigón de alto desempeño con macrofibras de polipropileno. Se evaluaron tres dosis de macrofibras de polipropileno (fracción de volumen de 0.39 %, 0.63 % y 0.79 %), incluido el humo de sílice (0.0 % y 7.0 % de agua-cemento), para dos tipos de agregado grueso (piedra caliza y grava de río) con dos tamaños nominales máximos. En total, 96 probetas de concreto se sometieron a pruebas de compresión y flexión para evaluar el efecto de la adición de fibra, humo de sílice y diferentes tipos de agregados. Los resultados mostraron una resistencia a la compresión entre 36 MPa y 71 MPa, y una resistencia a la flexión de 3.6 MPa a 5.8 MPa, lo que indica un concreto de alto desempeño. El trabajo demuestra que es posible conseguir un hormigón de alta resistencia con macrofibras de polipropileno de 55 mm combinadas con humos de sílice y agregados naturales tanto de tipo calizo como calcáreo, lo que resulta beneficioso para la producción local de hormigón de alto desempeño.
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