Acharya Prasanna K, Patro Sanjaya K
School of Civil Engineering, KIIT University, India.
Department of Civil Engineering, VSS University of Technology, India
Waste Manag Res. 2016 Aug;34(8):764-74. doi: 10.1177/0734242X16654751. Epub 2016 Jun 29.
Solid waste management is one of the subjects essentially addressing the current interest today. Due to the scarcity of land filling area, utilization of wastes in the construction sector has become an attractive proposition for disposal. Ferrochrome ash (FA) is a dust obtained as a waste material from the gas cleaning plant of Ferro alloy industries. It possesses the chemical requirements of granulated slag material used for the manufacture of Portland cement. Ferrochrome slag (FS) is another residue that is obtained as a solid waste by the smelting process during the production of stainless steel in Ferroalloy industries. FS possesses the required engineering properties of coarse aggregates. The possibility of using FA with lime for partial replacement of ordinary Portland cement (OPC) and FS for total replacement of natural coarse aggregates is explored in this research. The combined effect of FA with lime and FS-addition on the properties of concrete, such as workability, compressive strength, flexural strength, splitting tensile strength and sorptivity, were studied. Results of investigation revealed improvement in strength and durability properties of concrete on inclusion of FA and FS. Concrete mix containing 40% FA with 7% lime (replacing 47% OPC) and100% of FS (replacing 100% natural coarse aggregate) achieved the properties of normal concrete or even better properties at all ages. The results were confirmed by microscopic study such as X-ray diffraction and petrography examination. Environmental compatibility of concrete containing FA and FS was verified by the toxicity characteristic leaching procedure test.
固体废物管理是当今人们密切关注的重要课题之一。由于填埋场地稀缺，在建筑行业利用废弃物进行处置已成为一个颇具吸引力的方案。铬铁灰（FA）是铁合金工业气体净化厂产生的一种废料粉尘。它具备用于制造波特兰水泥的粒化矿渣材料的化学要求。铬铁渣（FS）是铁合金工业在不锈钢生产过程中通过熔炼工艺产生的另一种固体废弃物残渣。FS具备粗集料所需的工程性能。本研究探讨了将FA与石灰混合用于部分替代普通波特兰水泥（OPC）以及使用FS完全替代天然粗集料的可能性。研究了FA与石灰以及添加FS对混凝土性能（如工作性、抗压强度、抗弯强度、劈裂抗拉强度和吸水性）的综合影响。研究结果表明，掺入FA和FS可提高混凝土的强度和耐久性。含40% FA与7%石灰（替代47% OPC）以及100% FS（替代100%天然粗集料）的混凝土混合料在各龄期均达到了普通混凝土的性能，甚至表现更佳。通过X射线衍射和岩相学检查等微观研究证实了这些结果。通过毒性特性浸出程序试验验证了含FA和FS的混凝土的环境相容性。
