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.
关键词
固废资源化/铁矿废石/抗氯离子渗透性/强度等级
Key words
solid waste recycling/iron ore waste rock/chloride ion penetration resistance/strength grade
万方数据