Experimental Study On Fatigue And Freezing-thawing Performance Of Ferrous Mill Tailings Stabilized With Inorganic Binding Materials

The output of ferrous mill tailings has been increasing constantly with the rapid development of the iron and steel industry. The comprehensive application of ferrous mill tailings has raised great attention in that environment is polluted, land is used up, high costs and risks are spend. Ferrous Mill Tailings is used by road engineering which is also being explored and researching stage. The physical and mechanical properties, particle composition and chemical composition of ferrous mill tailings were analyzed and experiments and theoretical reasoning were done, which concludes that ferrous mill tailings will be used to construct roads as a great material.We got the optimal proportioning plans through pre-test: 23.6%lime stabilized iron tailings, 9.9% cement stabilized iron tailings, 10.5%lime1.8%cement stabilized iron tailings, mechanics properties, water stability and drying shrinkage of them satisfy the operational requirement of low grade highway basement. On the basis of those, durability of fatigue and freezing-thawing resistance performance of inorganic binders stabilized ferrous mill tailings with the optimal ratio were studied by indoor test. The results of indoor fatigue test were done regression analysis through Weibull distribution function, and set up fatigue equation in guaranteed rate 50% and 95%, respectively. The variation of weightlessness rate and tensile strength ratio with freezing-thawing cycles were obtained. These results were compared with those of limestone soil for illustrating issues.The result of fatigue test indicates that fatigue performance of ferrous mill tailings stabilized with lime is similar with soil-lime, fatigue performance of ferrous mill tailings stabilized with cement (lime) is better than soil-lime. freezing-thawing cycle result shows that durability of freezing-thawing resistance of ferrous mill tailings stabilized with inorganic binding materials is much better than that of soil-lime, durability of freezing-thawing resistance of ferrous mill tailings stabilized with cement stands out among the four mixture; For water-saturated freezing-thawing cycle test of ferrous mill tailings stabilized with cement (lime), residual strength ratio is basically stable after five cycles so that performance of anti-freeze-thaw or anti-freeze-thaw durability can be evaluated by residual strength ratio of the fifth freezing-thawing cycle.