Efficiency of self-healing cementitious materials with encapsulated polyurethane to reduce water ingress through cracks

B. Van Belleghem; K. Van Tittelboom; N. De Belie

doi:10.3989/mc.2018.05917

Autores/as

B. Van Belleghem Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering and Architecture, Ghent University - Strategic Initiative Materials (SIM), Tech Lane Ghent Science Park https://orcid.org/0000-0003-1294-1724
K. Van Tittelboom Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering and Architecture, Ghent University https://orcid.org/0000-0002-7718-3189
N. De Belie Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering and Architecture, Ghent University https://orcid.org/0000-0002-0851-6242

DOI:

https://doi.org/10.3989/mc.2018.05917

Palabras clave:

Mortero, Polímero, Durabilidad, Propiedades de transporte

Resumen

Las fisuras en hormigón armado pueden causar graves problemas de durabilidad debido al ingreso acelerado de sustancias agresivas. En este estudio, la reparación de fisuras fue llevada a cabo mediante la incorporación de agentes de curado encapsulados, a base de poliuretano, en el material cementíceo como mecanismo de curado autónomo. Los ensayos de absorción capilar mostraron que un agente de curado con alta viscosidad redujo el ingreso de agua en morteros fisurados, pero se encontró una gran dispersión en los resultados, lo que da lugar a un amplio rango de eficiencias de curado (18 – 108%). El poliuretano de baja viscosidad mostró un curado de las fisuras más completo y consistente. Se observaron eficiencias de curado del 95 al 124% (ancho de fisura de hasta 295 μm). El mecanismo de curado propuesto es muy efectivo para bloquear el ingreso de agua. Esto mejorará la durabilidad de los materiales cementíceos y consecuentemente extenderá su vida útil.

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