Abstract

Info

Title:: Effect of Magnetic Index on Properties of Cementbased Materials with Iron Ore Tailings

Author(s):: LI Xiao-guang; JING Shuai-shuai; MA Yu-ping; School of Civil Engineering, Changan University

Keywords:: iron ore tailing; magnetic index; mechanical property; microhardness; antichloride permeability; cement mortar; durability

Abstract:: A series of specimens of cement mortar and concrete were fabricated with iron ore tailings (IOT) containing eight different magnetic indexes and river sand respectively for purpose of application of IOT in cementbased materials. Mechanical properties, microhardness values of section cross, parameters of pore structure of mortars and antichloride permeability of concrete for specimens were measured to clarify effect of magnetic index on properties of cementbased materials with IOT. The test results show that mechanical property of IOT mortar is superior to that of river sand mortar and decreases with increasing of magnetic index of IOT, except mortar with 40% magnetic index still acquiring higher strength. Maximum microhardness can be measured on interface region of IOT mortar as 0% magnetic index, IOT mortar of 40% magnetic index secondly. Lower porosity and more harmless pore can be discovered in the IOT mortars with 0%, 40% magnetic indexes. Magnetic separation to IOT can generate a high antichloride permeability of concrete resulting in better long term durability.