Study on Preparation of Ceramsite from Iron Tailings and Its Application in Lightweight Aggregate Concrete
In order to expand the application range of Meishan iron ore tailings,lightweight closed-cell ceramsite is prepared by silicon carbide foaming method with Meishan iron ore tailings as the main raw material and applied to ceramsite concrete.The effects of silicon carbide addition and firing temperature on the structure and properties of lightweight ceramsite and the effects of concrete ingredients on the structure and properties of lightweight aggregate concrete are studied by means of X-ray diffractometer,scanning electron microscope and X-ray computed tomography.The results show that:①900,800,700 kg/cm3 light-weight closed-cell ceramsite can be prepared by silicon carbide foaming method with Meishan iron ore tail-ings as the main raw material,and the addition amount of iron ore tailings is higher than 80%.②In the case of a certain amount of silicon carbide,with the increase of sintering temperature,the packing density of ce-ramsite decreases,the cylinder compressive strength decreases,and the bearing capacity decreases.Three kinds of ceramsite with different structures can be obtained.③L15～L30 lightweight ceramsite concrete can be prepared by using 700 kg/cm3 iron ore tailings ceramsite to meet the requirements of the national stan-dard.The high strength of ceramsite concrete is due to the good combination between cement paste and ce-ramsite,fly ash and sand.
iron ore tailingsceramsitelightweight aggregate concretestructureproperties
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