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| Preparation and Properties of Autoclaved Aerated Concrete Using Iron Ore Tailings |
| WANG Changlong1,2 NI Wen1** QIAO Chunyu1 WANG Shuang1 WU Hui1 LI Yuan1 |
1. Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083;
2. School of Civil Engineering, Hebei University of Engineering, Handan 056038 |
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Cite this article:
WANG Changlong, NI Wen, QIAO Chunyu, WANG Shuang, WU Hui, LI Yuan. Preparation and Properties of Autoclaved Aerated Concrete Using Iron Ore Tailings. Chinese Journal of Materials Research, 2013, 27(2): 157-162.
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Abstract Iron ore tailings are used as raw materials to prepare autoclaved aerated concrete (AAC). The effects of fineness and content of iron ore tailings on the properties of AAC were investigated. The results show: as the fineness of iron ore tailings decreases, the mobility of slurry increases, a formation of lot of fine and even bubbles decrease the density of bulks; however, too fine tailings lowers mobility of slurry and a lot of bubbles crack while pouring, which increases density. The decrease of fineness of tailings leads to increase of the hydration reaction rate, generate more hydration products, so compressive strength of bulks increases. But, too fine tailings results in too fine residual of raw material, which is bad to form good pore structure and lowers the strength. High content tailings can fill completely space among hydration products and increase the bulk density. Increase of tailings content increases the amount of tobermorite, and changes the shape of tobermorite from needle-like to short-fiber-like, intersection of which forms network structure and increases the strength. However, too high content of tailings makes the connection of products and the network structure loose, the amount of tobermorite decrease, which result in decrease of the compressive strength.
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