Research the strength properties of phosphogypsum based composite filling materials
In order to improve the comprehensive resource utilization of phosphogypsum,the experimental research of new composite filling cementitous materials that will be replaced the cement has been carried out,which uses the phosphogypsum as the basic material,the lime,slag powder and other solid waste as auxiliary materials based on the requirement of mine.The researchers use the orthogonal experimental to study the role of phosphogypsum addition for the strength of new composite filling cementitous materials.Obtained the strength rule function of new composite filling cementitous materials based on the phosphogypsum by genetic programming,then use the genetic alogrithms to optimize the regression function.The results shown the strength of new composite filling cementitous materials based on the phosphogypsum can meet the requirement of Mine when lime is 4.48％,phosphogypsum is 32.42％,glauber is 2.35％,sodium hydroxide is 2.5％and slag powder is 58.3％.Using the SEM and XRD to analysis the hydration mechanism of the new composite filling cementitous materials,the C-S-H gel and errringite are mainly hydration products.Comparing with the contrast test of cement,the hydration products of new composite filling cementitous materials based on the phosphogypsum have more errringite than cement.Sodium hydroxide is added to accelerate the speed of hydration,and enhance the filling body age compressive strength.With the increase of curing time,the hydration products are growing and constantly filled in the pore,so the structure becomes more dense and has more better mechanical properties.
phosphogypsumcomposite filling materialslaw of compressive strengthoptimization algorithm
万方数据
维普
