Phosphorus Slag In Concrete Research

The Phosphorous slag(PS) is that electric furnace legal institutions prepares the industry by-product time yellow phosphorus, in the process of the yellow phosphorus preparation, the agent making use of coke and the silica to be a reducer and ready-made a residue , the queen uses calcium and silicon dioxide chemical combination in phosphorus ore , forms six-zone-pass slag , that is discharged, by that the high-handed water quenching emergency is cold, be to be a granulation electric furnace phosphorus residue , be called the phosphorus residue for short. The staple is CaO and SiO₂ , shares contents above 80% , contains a few TiO₂ , Fe₂O₃, P₂O₅, MgO , F , K₂O and Na₂O etc. besides. Each the yellow phosphorus producing lt only is capable to do the residue discharging 8～10tPS. At present, our country PS blowoff amounts use our country more, the land contaminating as well as being extravagant to the environment, that P₂O₅ and other harmful element in PS is able to strain down in the rainwater rushing is able to seep into ground , brings about soil contaminating reaching underground pollution.Study phosphorous slag powder adulterates amounts , phosphorous slag thin degree and the different excitant affect the experiment having been in progress to concrete compression strength , the experiment bear fruit indicates to the phosphorus originally, the height affecting , adulterating amounts to increase , compression strength amounts and thin degree are adulterated by phosphorous slag reduce , specific surface area enhances , the compression strength strengthens a compression strength mainly. Phosphorous slag powder adulterates amounts being 20% , specific surface area is that 612 m²/kg.. Phosphorous slag powder stirs and mixes the concrete making resist intensity of pressure .When using an excitant to arouse phosphorous slag activity, the rise mixing natural gupse , 120℃fever gupse , 550℃fever gupse , phosphorus gupse , 550℃excitants such as burning gupse + life lime powder and growing lime powder being able to improve phosphorous slag concrete intensity , mix contents phosphorous slag 8%'s natural gupse compression strengths to 7d , 28d among them is maximal.The thesis carries out contrast studies on the various function adulterating the phosphorous slag powder concrete and adulterating 20% phosphorous slag powder (the outside adulterates 8% gupse of phosphorous slag contents doing an excitant) concrete , freezes the function , the impervious function , contracts an experiment including that the concrete stirring and mixing the small side door thing function , the Mechanics function , resisting. Experiment research is indicated: Mix phosphorous slag powder and the excitant queen in the concrete, the concrete stirs and mixes collapsing agreeing well with a thing that assured source of life degree , expansion degree improve , he weeping rate reduction, makes a service behaviour get improvement. The concrete setting time prolongs but, this is advantageous to the concrete being under construction under big volume concretes , remote the concrete transporting and the height air temperature; After mixing phosphorous slag powder and the excitant, Can improve the hole structure hardening the thick fluid body , make big hole decrease , pinhole increase by notably, The phosphorous slag powder thick fluid body Ca (OH)₂ notable decreases , C-S-H increase by , structure is compact. The concrete 28d cubes compression strength , resisting to break the intensity , the axle centre compression strength up , splitting off a tensile strength and so on exceed all already the criterion concrete's. Whose resisting to freeze the function , the impervious function , resisting to contract a function and so on has and improvement to varying degrees equally , the concrete durability is also managed to improve; The value the limit is stretched is bigger , the early phase ball model is lower, this function beneficial to improving big irrigation works volume concretes resisting cracking; Early phase shrinks with no result comparatively big , reinforcing therefore.The Guizhou phosphorous slag is in starting phase in concrete middle application study, if rational use in being able to have an effect to grind effluence Guizhou local phosphorous slag powder in the concrete, not only resolving the land problem occupying a great quantity because of phosphorous slag hold-up, can enjoy country reducing or remitting taxes policy , change useless for treasure, the problem contaminating , social benefits having resolved land more greatly are notable.