Effect of Desulphurization Gypsum on the Strength and Microstructure of the Sludge Ash Cementitious System
[1]LU Qianming,WANG Xueqing,FU Shaojun,et al.Effect of Desulphurization Gypsum on the Strength and Microstructure of the Sludge Ash Cementitious System[J].Journal of Zhengzhou University (Engineering Science),2021,42(03):99-.[doi:10.13705/j.issn.1671-6833.2021.03.017]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
42卷
Number of periods:
2021 03
Page number:
99-
Column:
Public date:
2021-05-10
- Title:
- Effect of Desulphurization Gypsum on the Strength and Microstructure of the Sludge Ash Cementitious System
- Keywords:
- desulphurization gypsum; sludge ash; compressive strength; microscopic analysis; hydration product
- CLC:
- -
- DOI:
- 10.13705/j.issn.1671-6833.2021.03.017
- Abstract:
- In order to realize the resource utilization of sewage sludge ash, the effect of desulphurization gypsum on the strength and hydration products of the sewage sludge ash cementitious system at different stages was studied by means of paste strength measurement, X-ray diffraction, infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. The result showed that the hydration products of the sewage sludge ash cementitious system were mainly ettringite, portlandite and hydrated silicon aluminum (iron) calcium gel. Desulphurization gypsum promoted the early hydration of calcium silicate in the cementitious system, generated more hydration products, and improved the degree of polymerization of the hydrated gel and strength of the sample; at the later stage of hydration, desulphurization gypsum accelerated the alkali-induced reaction of cementitious system, promoting the formation of more gel phase. The microstructure of the cementing system was mainly composed of granular products with low development degree, and there were many holes in the structure. After adding desulfurization gypsum, a large number of plate-like calcium hydroxide and short rod ettringite crystals were produced, interlacing and filling in the interlayer space of the gel, which improved the compactness of microstructures and macroscopic strength.
- References:
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[1] GUO X L, SHI H S. Thermal treatment and utilization of flue gas desulphurization gypsum as an admixture in cement and concrete[J]. Construction and building materials, 2008, 22(7): 1471-1476.[2] BOONSERM K, SATA V, PIMRAKSA K, et al. Improved geopolymerization of bottom ash by incorporating fly ash and using waste gypsum as additive[J]. Cement and concrete composites, 2012, 34(7): 819-824.[3] 施惠生,刘红岩. 脱硫石膏在矿渣水泥中的资源化利用[J]. 同济大学学报(自然科学版), 2008, 36 (1): 66-70.[4] 李诗尧,赵纯,孙志华,等. 新疆地区电厂脱硫石膏增强的水泥基污泥固化剂的制备及性能分析[J]. 环境工程, 2019, 37(3): 146-149.[5] 卢前明,张元馨,张瑞林,等. 污泥灰-水泥胶凝体系的力学性能及微观分析[J]. 安全与环境学报, 2019, 19(1): 308-311.[6] 卢红霞,吕泽刚,程向前,等. 利用废渣一次烧结制备微晶玻璃釉面砖的研究[J]. 郑州大学学报(工学版), 2018, 39(2): 92-96.[7] 高术杰,倪文,祝丽萍,等. 脱硫石膏对赤泥-矿渣胶结充填料强度性能的影响[J]. 中南大学学报(自然科学版), 2013, 44(6): 2260-2265.[8] 崔潮,彭晖,刘扬,等. 矿渣掺量及激发剂模数对偏高岭土基地聚物常温固化的影响[J]. 建筑材料学报, 2017, 20(4): 536-541.[9] 赵晓刚. 水化硅酸钙的合成及其组成、结构与形貌[D]. 武汉:武汉理工大学, 2010.[10] 王磊,何真,张博,等. 基于红外与核磁共振技术揭示C-S-H聚合机理[J]. 建筑材料学报, 2011, 14(4): 447-451.[11] 施韬,杨泽平,郑立炜. 碳纳米管改性水泥基复合材料早龄期水化反应的傅里叶红外光谱[J]. 复合材料学报, 2017, 34(3): 654-659.[12] ZAHARAKI D, KOMNITSAS K, PERDIKATSIS V. Use of analytical techniques for identification of inorganic polymer gel composition[J]. Journal of materials science, 2010, 45(10): 2715-2724.[13] 傅博,杨长辉,程臻贇. 高温对碱矿渣水泥石产物及微结构的影响[J]. 华中科技大学学报(自然科学版), 2013, 41(5): 34-38.[14] 王冲,杨长辉,钱觉时,等. 粉煤灰与矿渣的早期火山灰反应放热行为及其机理[J]. 硅酸盐学报, 2012, 40(7): 1050-1058.[15] 潘晓燕,张广兴,张晏清,等. 纳米SiO2改性水泥土钉注浆体性能的研究[J]. 建筑材料学报, 2017, 20(2): 255-260.[16] 吴蓬,吕宪俊,王俊祥,等. 硬石膏对熟料激发矿渣水化反应的影响[J]. 中国矿业大学学报, 2016, 45(3): 615-621.
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Last Update:
2021-06-24