Review article

Porosity of acoustic wood-wool cement board

Juraj Šipušić ; Faculty of Chemical Engineering and Technology University of Zagreb
Matej Ercegović ; Faculty of Chemical Engineering and Technology University of Zagreb
Filip Brleković ; Faculty of Chemical Engineering and Technology University of Zagreb

Abstract

Wood-wool cement board (WWCB) is a porous composite material consisting of Portland cement inorganic binder mixed with wood-wool as reinforcement. It is widely used as thermal and acoustic insulator in buildings because of low density, high porosity, good fire resistance and compatibility with other binders and building materials. The maority of composite characteristics, including as density, strength, oung modulus, gas permeability, thermal conductivity, and thermal diffusivity, are dependent on porosity. Aside from density, the other ualities stated, including sound absorption coefficient, are affected by pore sie distribution. The acoustic properties of airWWCB interaction are described through air complex modulus and air complex effective density used in many acoustic models for porous materials. Two techniues for determining porosity are used and compared on samples of wood-wool cement board from normal manufacturing received from FAMAT H d.o.o. Sv. ri arete, Croatia. The Archimedes techniue is utilied to determine the real and apparent density of the bulk WWCB, while image analysis of the surface layer and deeper layers reached by grinding and polishing is used to analye layer by layer porosity and pore sie distribution. The approaches are compared based on their complexity, length of analysis, and the type and uality of information obtained.

Keywords

wood-wool cement board, porosity, image analysis

Hrčak ID:

309414

URI

https://hrcak.srce.hr/309414

Publication date:

23.10.2023.

Visits: 132 *