Study on Mechanical Properties of Ultra-high Performance Concrete Prepared with Iron Tailings,Silico-manganese Slag and Red Mud
Two kinds of ultra-high performance concrete with different water-binder ratios were prepared by using iron tailing powder,silicomanganite slag powder and red mud as mineral admixtures to replace some ordinary Portland cement.The mechanical properties of Ultra-high Performance Concrete(UHPC)mixed with iron tailings,silica manganese slag and red mud were studied,and the effects of iron tailing powder content on the bending strength,splitting tensile strength and compres-sive strength of UHPC were investigated.The results show that:① In the ultra-high performance concrete with low water-binder ratio,the iron tailing powder has a greater effect on the bending strength of the concrete,but a smaller effect on the splitting tensile strength;② In the ultra-high performance concrete with high water-binder ratio,the influence of iron tailing powder on the bending strength of concrete is basically the same as that on the splitting tensile strength;③ With the increase of iron tail-ing powder content,the compressive strength of ultra-high performance concrete with water-binder ratio of 0.20 and 0.25 de-creases,and the maximum compressive strength of ultra-high performance concrete with silica manganese sludge-red mud group decreases by 19.2%and 22.9%at 28 days,respectively.The above analysis further reflects that:① the content of iron tailing powder in ultra-high performance concrete should not exceed 40%of the total mineral admixture;② The addition of iron tailing powder is not conducive to the improvement of early compressive strength of ultra-high performance concrete,but the appropri-ate addition of iron tailing powder(20%)is conducive to the late compressive strength of ultra-high performance concrete;③ The relationship between compressive strength and curing age of ultra-high performance concrete with iron tailings,silicon-manganese slag and red mud is relatively concentrated,and the fitting correlation coefficient is higher.
iron tailingssilicon manganese slagred mudultra-high performance concretemechanical property
万方数据
维普
