Ligand Optimization Research Of Spontaneous Combustion Gangue-fly Ash-slag Geological Polymer

As a kind of new green cementing material，geological polymer has become theresearch hot spot and been paid for much attention because it has high strength、hardenfast、better corrosion、high temperature resistant and many other features and a varietyof solid wastes which rich in active silicon aluminum component such as slag，fly ash andcoal gangue can be used as the main raw material and realize“grey”cement to “green”change. This paper is a subproject of the national natural science foundation of China coaljoint project 《research of gangue in cement and concrete resource utilization of keyscientific problems》.All the research results are funded by this foundation. Based on bulksolid waste gangue，slag and fly ash as main raw material.This paper use the bulk solidwaste gangue，slag and fly ash as main raw material，use the alkali activation way to madegeological polymer. First excitation agent varieties，excitation agent dosage and modulusof sodium silicate three factors and four levels of orthogonal test and study the threefactors of spontaneous combustion gangue-fly ash-slag geological polymer mortarstrength influence and law so as to determine excitation agent varieties，modulus ofsodium silicate and the optimal ligand parameter value range.Second by means ofquadratic response surface in the central composite design with sodium silicate modulusand ligand dosage for variable，realize the spontaneous combustion gangue-fly ash-slaggeological polymer ligand optimization and establish the adhesive strength and modulusof sodium silicate sand and ligand dosage of regression equation；Finally，the optimal offineness， setting time and volume stability and hydration heat and main technicalproperties testing. Specific research contents and results are as follows：(1) Orthogonal test results show that：Spontaneous combustion gangue-fly ash-slaggeological polymer optimal proportion for sodium silicate modulus is1.0，ligand dosage20%of cementing material. Excitation agent varieties to spontaneous combustiongangue-fly ash-slag geological polymer mortar strength impact，sodium silicate modulusand ligand admixture on the adhesive strength of sand effect is significant.The biggestinfluence on the workability of geological polymer is ligand admixture(2) Quadratic response surface test shows that：Spontaneous combustion gangue-fly ash-slag geological polymer mortar strengthwith sodium silicate modulus reduction and improve，as ligands increase with the increase of the dosage. When the modulus of sodium silicate is1.0，ligand dosage was20%，28dbending strength of glue sand is7.55MPa and compressive strength is56.52MPa. Butwhen sodium silicate modulus below1.0，it will appear insoluble precipitate，so sodiumsilicate module can not less than1.0.Ligand proportion of more than20%when glue sandclear sticky，adverse to meet the construction requirements of the mixture workability.(3) Other technical performance measurement results show that：Spontaneous combustion gangue-fly ash-slaggeological polymer each index allaccord with national standard GB175-1999，and show final setting time is short，lowhydration heat characteristic.