Influence of fillers on the alkali activated chamotte

3rd International Conference on Innovative Materials, Structures and Technologies

Dembovska, L.^1 ; Bumanis, G.^1 ; Vitola, L.^1 ; Bajare, D.^1

Riga Technical University, Department of Building Materials and Products, Institute of Materials and Structures, Kalku str. 1, Riga

LV-1658, Latvia^1

关键词: Alkali activated;    Alkali activation;    Aluminium scrap recycling;    Elevated temperature;    High temperature resistance;    High-temperature optical microscopies;    Pore-forming agents;    Strength increase;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/251/1/012009/pdf
DOI  :  10.1088/1757-899X/251/1/012009

来源: IOP

【 摘 要 】

Alkali-Activated materials (AAM) exhibit remarkable high-Temperature resistance which makes them perspective materials for high-Temperature applications, for instance as fire protecting and insulating materials in industrial furnaces. Series of experiments were carried out to develop optimum mix proportions of AAM based on chamotte with quartz sand (Q), olivine sand (OL) and firebrick sawing residues (K26) as fillers. Aluminium scrap recycling waste was considered as a pore forming agent and 6M NaOH alkali activation solution has been used. Lightweight porous AAM have been obtained with density in range from 600 to 880 kg/m3and compressive strength from 0.8 to 2.7 MPa. The XRD and high temperature optical microscopy was used to characterize the performance of AAM. The mechanical, physical and structural properties of the AAM were determined after the exposure to elevated temperatures at 800 and 1000°C. The results indicate that most promising results for AAM were with K26 filler where strength increase was observed while Q and OL filler reduced mechanical properties due to structure deterioration caused by expansive nature of selected filler.