Influence of zeolite additive on properties of autoclaved aerated concrete |
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| Authors: | Mustafa Albayrak,Abdulkerim Yö rü koğlu,Serdar Karahan,Sema Atlıhan,H. Yılmaz Aruntaş,İsmail Girgin |
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| Affiliation: | 1. Mineral Research and Exploration General Directorate, 06520 Ankara, Turkey;2. Faculty of Technical Education, Department of Construction, Gazi University, 06500 Ankara, Turkey;3. Mining Engineering Department, Hacettepe University, 06532 Beytepe, Ankara, Turkey |
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| Abstract: | In this experimental study, the effect of zeolite on the properties of autoclaved aerated concrete (AAC) was investigated. Zeolite was used as a quartzite replacement in conventional AAC mixtures. The zeolite containing AAC (ZAAC) specimens were prepared at bulk densities of 270–500 kg/m3. The specimens were examined by X-ray diffraction, X-ray fluorescence, and thermal analysis. Bulk density, compressive strength and thermal conductivity parameters were investigated. According to the results of research, the commercial AAC is mainly composed of tobermorite, quartz and anhydrite, but the specimens of ZAAC, besides tobermorite and quartz, contain unreacted anhydrite and clinoptilolite phases. XRD patterns of ZAAC obtained after treatment at 700–1000 °C show that wollastonite, gehlenite and orthoclase are the new phases formed. It was observed that application of zeolite in AAC significantly lowered the thermal conductivity of autoclaved products (0.08–0.12 kcal/m h °C) providing the compressive strength at the level of 1.22−3.34 N/mm2. |
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| Keywords: | Autoclaved aerated concrete Thermal treatment Zeolite X-ray diffraction Compressive strength Thermal conductivity |
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