脱硫石膏基复合胶凝材料的物理力学性能试验
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摘要
以β型脱硫石膏为基材,混掺水泥、粉煤灰和硅灰等胶凝材料,加入自制的专用改性外加剂,制备脱硫石膏基复合胶凝材料,测试分析原料组分、水胶比和养护方式对脱硫石膏基复合胶凝材料性能的影响,通过SEM和XRD测试手段探讨其强度形成及耐水机理。试验结果表明:水泥掺量为20%、粉煤灰掺量为25%和水胶比为0.7时的脱硫石膏基复合胶凝材料综合性能优良,其28 d抗压强度为12.1 MPa,吸水率为17.6%,软化系数为0.81;二水石膏晶体形成的第一支撑骨架和以钙矾石和C―S―H凝胶等形成的第二支撑骨架相互补充,提高了脱硫石膏基复合胶凝材料结构的致密性和耐水性。
The flue gas desulfurization(FGD) gypsum-based cementitious materials are prepared by using theβ type desulfurization gypsum as the base material,including mixing cement,fly ash,silica fume and self-made modified additive. The effects of raw material composition,water to cementitious material ratio and curing methods on the properties of the FGD gypsum-based cementitious materials have been tested and an-alyzed,and the formation of strength and water resistance mechanism are explored by means of SEM,XRD analysis. The experimental results show that the performance of the FGD gypsum -based cementitious mat-erials is excellent when 20% cement,25% fly ash are mixed with a water to cementitious material ratio of 0.7. On these conditions,the compressive strength,water absorption and softening coefficient of specimens at the 28th day are 12.1 MPa,17.6%,and 0.81,respectively. There are two types of skeletons in the specimens made with FGD gypsum -based cementitious materials,which synergistically supports the struc -ture. The first skeleton is formed by dihydrate gypsum crystals,providing the early-age strength for the specimens. The second skeleton is formed by ettringite and C―S―H gel,providing strength in later ages.The skeletons improve the compactness and the water resistance of the specimens made with FGD gypsum-based cementitious materials.
The flue gas desulfurization(FGD) gypsum-based cementitious materials are prepared by using theβ type desulfurization gypsum as the base material,including mixing cement,fly ash,silica fume and self-made modified additive. The effects of raw material composition,water to cementitious material ratio and curing methods on the properties of the FGD gypsum-based cementitious materials have been tested and an-alyzed,and the formation of strength and water resistance mechanism are explored by means of SEM,XRD analysis. The experimental results show that the performance of the FGD gypsum -based cementitious mat-erials is excellent when 20% cement,25% fly ash are mixed with a water to cementitious material ratio of 0.7. On these conditions,the compressive strength,water absorption and softening coefficient of specimens at the 28th day are 12.1 MPa,17.6%,and 0.81,respectively. There are two types of skeletons in the specimens made with FGD gypsum -based cementitious materials,which synergistically supports the struc -ture. The first skeleton is formed by dihydrate gypsum crystals,providing the early-age strength for the specimens. The second skeleton is formed by ettringite and C―S―H gel,providing strength in later ages.The skeletons improve the compactness and the water resistance of the specimens made with FGD gypsum-based cementitious materials.
引文
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[16]桂敬能.石膏基复合材料轻质隔墙板制备及拼接缝受力仿真分析[D].南京:南京航空航天大学,2018.GUI Jingneng.Preparation and stress analysis on stitch-ing seam of lightweight partition board made of gyp-sum-based composite materials[D]. Nanjing:Nanjing University of Aeronautics and Astronautics,2018.
[2] MEHAFFEY J R,CUERRIER P,CARISSE G. A model for predicting heat transfer through gypsum-board/wood-stud walls exposed to fire[J]. British Medical Journal,1994,18(18):297-305.
[3] MANZELLO S L,GANN R G,KUKUCK S R,et al. Performance of a non-load-bearing steel stud gyp sum board wall assembly:Experiments and modelling[J]. Fire&Materials,2007,31(5):297-310.
[4]张志国,高玲艳,杨伶凤,等.脱硫石膏制耐水石膏砌块的研究[J].粉煤灰综合利用,2009(2):27-30.ZHANG Zhiguo,GAO Lingyan,YANG Lingfeng,et al. Study on water resisitant gypsum blocks from desulfurization gypsum[J]. Fly Ash Comprehensive Utilization,2009(2):27-30.
[5]李建权,李国忠,张国辉.石膏复合防水剂对石膏晶体形成的影响[J].建筑材料学报,2007,10(2):137-141.LI Jianquan,LI Guozhong,ZHANG Guohui. Effect of the gypsum waterproof agent on gypsum crystal formation[J]. Journal of Building Materials,2007,10(2):137-141.
[6] CAMARINI G, MILITO J A D. Gypsum hemihydrate-cement blends to improve renderings du-rability[J]. Construction&Building Materials,2011,25(11):4121-4125.
[7] KOVLER K. Enhancing water resistance of cement and gypsum-cement materials[J]. Journal of Materials in Civil Engineering,2001,13(5):349-355.
[8] BUTAKOVA M D,GORBUNOV S P. Study of the influence of complex additives on properties of the gypsum-cement-puzzolan binder and concretes on its basis[J]. Procedia Engineering, 2016, 150:1461-1467.
[9]施惠生,郭晓潞,阚黎黎.水泥基材料科学[M].北京:中国建材工业出版社,2011.SHI Huisheng,GUO Xiaolu,KAN LiLi. Cement based materials science[M]. Beijing:China Building Materials Industry Press,2011.
[10] PREECE S J,BILLINGHAM J,KING A C. On the initial stages of cement hydration[J]. Journal of Eng-ineering Mathematics,2001,40(1):43-58.
[11] GAWLICKI M,NOCU?-WCZELIK W,?UKASZ B. Calorimetry in the studies of cement hydration[J].Journal of Thermal Analysis and Calorimetry,2010,100(2):571-576.
[12]马振珠,岳汉威,宋晓岚.水泥水化过程的机理、测试及影响因素[J].长沙大学学报,2009,23(2):43-46.MA Zhenzhu, YUE Hanwei, SONG Xiaolan.Mechanism,testing and influencing factors of cement hydration process[J]. Journal of Changsha University,2009,23(2):43-46.
[13]陶文宏,刘宗明,张明星,等.脱硫石膏-石灰-粉煤灰体系胶凝性及水化机理[J].济南大学学报(自然科学版),2010,24(3):233-237.TAO Wenhong,LIU Zongming,ZHANG Mingxing,et al. Cementitious property and hydration mechanism of desulphogypsum-lime-fly ash system[J]. Journal of University of Jinan(Sci&Tech),2010,24(3):233-237.
[14] SINGH N B, KALRA M, KUMAR M, et al.Hydration of ternary cementitious system:Portland cement,fly ash and silica fume[J]. Journal of Thermal Analysis and Calorimetry,2015,119(1):381-389.
[15]诸培南,翁臻培,王天顺.无机非金属材料显微结构图谱手册[M].武汉:武汉工业大学出版社,1994:56-78.ZHU Peinan,WENG Zhenpei,WANG Tianshun.Manual of atlas of microstructure of inorganic nonme-tallic materials[M]. Wuhan:Wuhan Tech University Press,1994:56-78.
[16]桂敬能.石膏基复合材料轻质隔墙板制备及拼接缝受力仿真分析[D].南京:南京航空航天大学,2018.GUI Jingneng.Preparation and stress analysis on stitch-ing seam of lightweight partition board made of gyp-sum-based composite materials[D]. Nanjing:Nanjing University of Aeronautics and Astronautics,2018.