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为了合理地二次利用铁尾矿,设置了2种不同的取代工况,即利用磨碎的粉状铁尾矿取代水泥和利用铁尾矿砂取代细骨料,研究了不同取代率下铁尾矿混凝土的工作性能与抗压性能(3,7,28d,棱柱体)。试验结果表明,适量的水泥取代率能够使混凝土的流动性能变强,使其各指标抗压强度均出现降低,龄期越大,降低幅度越小;细骨料取代工况下,混凝土的流动性能变差,掺量越高,流动性能损失越大,混凝土抗压强度随掺量的增加有先升高后降低的趋势;掺量为50%时,能获得较好的抗压性能。2种工况对棱柱体与立方体的抗压强度比值α1的影响大致相同,α1的取值为0.80~0.84。
In order to rationally reuse the iron tailings, two different substitution conditions were set up, that is, the use of ground powdered iron tailings to replace cement and the use of iron tailings instead of fine aggregates. The effects of iron tail Working performance and compressive performance of mine concrete (3,7,28d, prismatic body). The test results show that the appropriate amount of cement substitution rate can make the flowability of concrete become stronger and the compressive strength of all indexes decrease, while the age is larger and the decrease extent is smaller. Under the condition of fine aggregate substitution, the flow of concrete The higher the dosage is, the greater the loss of flowability is. The compressive strength of concrete first increases and then decreases with the increase of dosage. When the dosage is 50%, the compressive strength of concrete is better. The influence of two kinds of working conditions on the compressive strength ratio α1 of prism and cube is roughly the same, and the value of α1 is 0.80 ~ 0.84.