Study On Water Stability Of Manganese Slag Asphalt Mixture

Strengthening environmental protection and effective utilization of resources come asthe top subject of the21st century. The large amount of manganese slag piled in surplus isa waste of the national land resource. More severely, it results in pollution in environment.The ferrous manganese smelting sector is also eager to improve the use ratio of ferrousmanganese slag and reduce its pollution on environment. Applying manganese slag asmaterials for construction with proper and effective means for use is a subject of importantsignificance. According to the industrial circumstances at present, this thesis targets atGuangxi Laibinbayi Ferroalloy Plant in its sewage disposal of water-quenched ferrousmanganese slag and conducts analysis into water stability of ferrous manganese mineralpowder and asphalt mixture.The research is conducted via room experiments regarding to the following aspects:①Probe into influential factors and standards for appraisal of water stability inasphalt mixture, devise a proper experimental plan and select an appropriate way fortesting water stability of ferrous manganese mineral powder and asphalt mixture;②Design and calculate proper ferrous-manganese-mineral-powder-asphalt-mixtureproportion according to the theory for proper proportion and aggregate screen test. Selectthe best asphalt-aggregate ratio via comparison among the physical and mechanicalproperties rest separately in ferrous manganese mineral powder and asphalt mixturespecified respectively4.2%,4.4%,4.6%and4.8%;③Prepare ferrous manganese mineral powder and asphalt mixture and limestonemineral powder and asphalt mixture in accordance with the mix proportion and standardsas required in the experiment;④Conduct tests respectively to determine stability, immersion stability, splittingstrength and freeze-thaw splitting strength separately on the two mixtures, calculate theimmersion-residual-stability-freeze-thaw-splitting ratio and evaluate advantages anddisadvantages respectively in ferrous manganese mineral powder and asphalt mixture andlimestone mineral powder and asphalt mixture.Conduct the Immersion Marshall Test and freeze-thaw splitting test and evaluate thestability of ferrous manganese mineral powder and asphalt mixture, and compare withlimestone mineral powder and asphalt mixture in identical grading. Results derived fromthe experiments imply that: the residual stability and residual splitting strength of the two mixtures both comply with standards and requirements. Meanwhile, the comparison testproves the residual stability in ferrous manganese mineral powder and asphalt mixture is6.2%higher than that in normal mineral powder and asphalt mixture. The residualsplitting strength is4.8%higher in ferrous manganese mineral powder and asphalt mixturethat that in normal mineral powder and asphalt mixture. The water stability in ferrousmanganese mineral powder and asphalt mixture is higher than that in limestone mineralpowder and asphalt mixture.