HORMIGÓN LIGERO BASADO EN CORTEZA DE PINO: ADITIVOS QUE EVITAN LA INHIBICIÓN DEL FRAGUADO

Abstract

Lightweight concrete involve a great interest as composite material for the building field due to their low weight, thermal insulation and sound absorption capacity. Traditionally, lightweight concrete are obtained by foaming, by adding lightweight mineral fillers, polymers or vegetable origin materials. Bark is the material that plants make as defense and protection against climatic and biological action, resulting less dense than wood. Pine bark is a byproduct of the timber industry, sustainable, with global accessibility and low cost. Due to its natural properties and design has an interesting potential as lightweight filler in cement - wood composites. The idea of including pine bark in a cement matrix is not new, but until now had been discarded because pine bark contains large amounts of polyphenols. These substances exert a strong inhibitory effect of cement setting, making it impossible to achieve useful materials from pine bark. This paper has explored the treatment of pine bark with different additives to prevent the inhibition of cement setting due to the release of polyphenols. Applying these results, for the first time a lightweight pine bark concrete is presented. Keywords: Materials; Concrete; Pine bark