Original scientific paper
Porosity of acoustic wood-wool cement board
Juraj Šipušić
; Faculty of Chemical Engineering and Technology University of Zagreb, Zagreb, Croatia
Matej Ercegović
; University of Zagreb Faculty of Chemical Engineering and Technology, Zagreb, Croatia
Filip Brleković
; University of Zagreb Faculty of Chemical Engineering and Technology, Zagreb, Croatia
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 majority of composite characteristics, including as density, strength, Young modulus, gas permeability, thermal conductivity, and thermal diffusivity, are dependent on porosity. Aside from density, the other qualities stated, including sound absorption coefficient, are affected by pore size distribution. The acoustic properties of air/WWCB interaction are described through air complex modulus and air complex effective density used in many acoustic models for porous materials. Two techniques for determining porosity are used and compared on samples of wood-wool cement board from normal manufacturing received from FRAGMAT H d.o.o. Sv. Križ Začretje, Croatia. The Archimedes technique is utilized 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 analyze layer by layer porosity and pore size distribution. The approaches are compared based on their complexity, length of analysis, and the type and quality of information obtained.
Keywords
wood-wool cement board, porosity, image analysis
Hrčak ID:
317853
URI
Publication date:
23.10.2023.
Visits: 225 *