The mechanism of activator to fluorgypsum and the fluorine solidification were investigated by the performances of composite binding material.Through the setting time testing of fluorgypsum with NaOH,Na2SO4 and NaF,the least activator dosage were all 1％.And the cementitious material over 80％ of fluorgypsum was processed to improve its quality with slag,fly ash and clinker.The maximum compressive strength of composite binding material was over 12.90 MPa in 28 days,and the concentration of fluroride reduced 64.7％ which compared with the pure fluorgypsum binding material.Analysis of X-ray diffraction and scanning electron microscopy images showed that ettringite crystals,dihydrate gypsum crystals and C-S-H gel were filled with each other.The unreacted CaF2 crystals were embedded by a great deal of network and filamentous C-S-H gel.It was the main reason that the composite binding material strength improved,water resistance increased and leaching loxicity reduced.
参考文献
| [1] | 阎培渝,游轶.在不同条件养护的氟石膏粉煤灰胶结材的水化硬化性能[J].硅酸盐学报,1998(06):689-694. |
| [2] | 周万良,龙靖华,詹炳根.粉煤灰-氟石膏-水泥复合胶凝材料性能的深入研究[J].建筑材料学报,2008(02):179-182. |
| [3] | 王加荣,刘家祥.氟石膏、粉煤灰配制胶结材和混凝土的研究[J].矿产综合利用,2009(06):38-41. |
| [4] | P. E. Fraire-Luna;J. I. Escalante-Garcia;A. Gorokhovsky .Composite systems fluorgypsum-blastfumance slag-metakaolin, strength and microstructures[J].Cement and Concrete Research,2006(6):1048-1055. |
| [5] | Hydraulic binders of Fluorgypsum-Portland cement and blast furnace slag, stability and mechanical properties[J].Construction and Building Materials,2010(5):631. |
| [6] | 彭家惠,张建新,白冷,李青.矿渣改性硬石膏基胶结材水化硬化研究[J].同济大学学报（自然科学版）,2009(07):934-937,959. |
| [7] | 彭家惠,张桂红,白冷,张建新,瞿金东.硫酸盐激发与矿渣改性硬石膏胶结材[J].硅酸盐通报,2008(04):837-842. |
| [8] | P.Yan;W.Yang .Microstructure and properties of the binder of fly ash-fluorogypsum-Portland cement[J].Cement and Concrete Research,1999(3):349-354. |
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