Chloride ion penetration resistance of iron ore waste rock aggregate concrete with different strength grade
In the context of the development of solid waste recycling,using aggregates produced from iron ore waste rock to prepare concrete can effectively alleviate the dilemma of depletion of natural sand and gravel.In order to study the chloride ion penetration resis-tance of iron ore waste rock aggregate concrete with different strength grade,concrete with water-binder ratios of 0.59,0.35 and 0.23 were designed.Cubic compressive strength tests were carried out and the electric flux method was used to test the chloride ion penetration resis-tance of the cured concrete for 28 d and 56 d.The test results show that after 28 days of curing,the compressive strengths of the three con-crete cubes are 25.3 MPa,54.6 MPa,and 79.9 MPa,respectively,and the permeability evaluations are in order of low,very low,and negli-gible.After 56 days of curing,the compressive strengths of the three types of concrete increased by 16.9％,9.4％,and 7.4％,and the electri-cal flux was significantly reduced,indicating that the curing age has a significant impact on the permeability.The electric flux and compres-sive strength of concrete have a very strong correlation,showing a linear decreasing relationship.
solid waste recyclingiron ore waste rockchloride ion penetration resistancestrength grade
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