| Chinese iron tailings take1/3of the total amount of tailings, which caused serious environmental pollution and resulted huge wastes of resources. According to this situation, comprehensive utilization of the iron tailing is a beneficial topic for development of economy and society.This study focused on the preparation of aerated concrete blocks which used Hainan ChangJiang iron tailings as a kind of materials. The influence on the compressive strength of aerated concrete block was discussed based of the various ratios of iron tailings, quartz sand, cement, and CaO. After that, the orthogonal experiments of single factor were completed to gain the optimal ratio.The results showed that the optimum ratio of iron tailings, quartz sand, cement, and CaO was59.20%,8.26%,15.96%and14.03%, respectively. At the same time, the proportions of gypsum, aluminite powder, and foam stabilizer took1%,0.06%and0.07%, respectively. The maximum compressive strength4.85MPa was obtained when the ratio of water to raw materials reached0.58:1.The effects of the tropical atmosphere on the interfacial bonding strength between aerated concrete block and concrete were investigated. The experiments were performed when the moisture content and salt content were used as variables. Meanwhile, the samples were treated by thermal shock, humid shock, and they were exposed to insolation to obtain interfacial bonding strength between aerated concrete block and concrete.The results showed that the interfacial bonding strength reached the maximum vale when the moisture content of aerated concrete block was24%. The interfacial bonding strength further gradually decreased with increasing the moisture content. The interfacial bonding strength increased with the incorporation of salt. Thermal shock had a certain influence on the interfacial bonding strength, and the influence of humid shock was significant, while the influence of exposure was not so distinct. |
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