Study on the effect of ferronickel powder on hydration performance of cement
The ferronickel slag is made into powder with a particle size of less than 0.075 mm,used as a mineral admixture to replace part of the cement,the influence of nickel-iron powder on the hydration performance and strength of cement under different composite ratios was tested.Through XRF analysis,it is found that the nickel-iron powder contains more SiO2-MgO-FeO ternary system,which has good pozzolanic activity.The addition of nickel-iron powder can delay the hydration time of cement to a large extent.Compared with the blank group,the appearance time of the second hydration exothermic peak is delayed by 8h in the system of adding 30％nickel-iron powder.To reduce the hydration heat release of the system,compared with the blank group,when the content of nickel-iron powder was 10％,20％and 30％,the cumulative heat release of the system decreased by 33％,46％and 63％respectively.The addition of nickel-iron powder significantly reduces the compressive strength of the test block,but the nickel-iron powder has a secondary hydration effect,which can improve the later compressive strength of the slurry.In the case of adding 20％nickel-iron powder,the 28 d strength of the test block can reach 86％of the blank group.
万方数据
维普
