振动搅拌对掺铁尾矿砂水泥稳定碎石混合料的影响研究

为综合分析铁尾矿砂水泥稳定碎石混合料路用性能的影响因素,本文对不同铁尾矿砂掺量(矿料质量的0%、5%、10%、15%、20%、25%)及不同成型方式(传统连续搅拌、振动搅拌)的水泥稳定碎石混合料的物理力学性能、耐久性及微观结构进行试验研究。研究结果表明,铁尾矿砂的加入能够提高水泥稳定碎石混合料的无侧限抗压强度、间接拉伸强度、水稳定性、抗冻性。当铁尾矿砂用量为10%时,水泥稳定碎石混合料的强度、水稳定性、抗冻性达到最大值;当铁尾矿砂掺量为5%时,水泥稳定碎石混合料的疲劳寿命最长。振动搅拌制备试样较连续搅拌有更高的强度、水稳定性、抗冻性及耐疲劳性能;振动搅拌制备的铁尾矿水泥稳定碎石混合料内部水泥水化程度更高,水化产物分布更均匀,能够降低混合料因应力集中而破坏的风险。

Effect of Vibration Mixing on Iron Tailing Cement Stabilized Macadam Mixture

In order to analyze the factors of the pavement performance of the cement stabilized macadam mixture with iron tailings, the mechanical strength, water stability, frost resistance and fatigue resistance of cement stabilized macadam mixture compacted by the different iron tailing content (0%, 5%, 10%, 15%, 20%, 25%) and different mixing method(static mixing, vibration mixing) were researched. The results show that the iron tailings improve the unconfined compressive strength, indirect tensile strength, water stability and frost resistance of cement stabilized macadam mixture. When the content of iron tailings is 10%, the mechanical strength, water stability and frost resistance of the cement stabilized macadam mixture reach the maximum. When the content of iron tailings is 5%, the fatigue life of the cement stabilized macadam mixture reaches the longest. The samples prepared by the vibration mixing have higher strength, water stability, frost resistance, and fatigue resistance. At the same time, the cement hydration degree inside the mixture is higher, and the distribution of hydration products is more uniform, which reduces the risk of damage to the mixture due to stress concentration.