| Abstract [eng] |
The purpose of this work is to study the effects of incorporating zeolitic waste and synthetic zeolite on the physical and mechanical properties of cement composites reinforced with wood fibres. Wood fibres cement composites have the advantages of low-density, high insect resistance, high fungal resistance, strong acoustic insulation and good thermal insulation properties. These natural (wood) fibres are lignocellulosic materials with significant amounts of lignin, hemicellulose, sugars and extractives that inhibit the setting time of cement hydration. To reduce the retardation caused by the wood fibres, zeolitic waste and synthetic zeolites are introduced into the wood fibres-cement system. Zeolites are chosen in this study as they exhibit pozzolanic properties which can be useful to increase the workability and mechanical properties of the cement composite system. Three types of wood fibres cement composites are prepared for investigation, the first type of composites contains 5% untreated wood fibres and different amounts of zeolitic waste (0%, 1%, 2%, 5%, 10%) based on the weight of cement; the second type of composites contains 5% ultrasonically treated wood fibres and zeolitic waste (0%, 1%, 2%, 5%, 10%); the third type of composites contains 5% ultrasonically treated wood fibres and synthetic zeolite (hydrosodalite) obtained from silica-gel waste (0%, 1%, 2%, 5%, 10%). From the obtained results, Type-1 composites with untreated wood fibres and zeolitic waste indicated agglomeration of wood fibres in the structure of the samples. Wood fibres cement composite with ultrasonically treated wood fibres and 10% zeolitic waste (Type-2) showed the most optimal results in terms of mechanical strength and physical properties. In this research, the investigated density of samples with treated wood fibres revealed that it was possible to produce lightweight composites with the densities ranging from 1000-1200 kg/m3. |
