α-半水石膏对掺铁尾砂水泥砂浆综合性能的影响  

Effect ofα-Hemihydrate Gypsum on Comprehensive Performance ofCement Mortar Doped with Iron Tailings

作　　者：皇甫婧琪 何强 HUANGFU Jing-qi;HE Qiang(Shanxi Vocational University of Engineering Science and Technology,Jinzhong 030619,China;College ofArchitecture and Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]山西工程科技职业大学,山西晋中030619 [2]太原理工大学土木建筑工程学院,太原030024

出　　处：《长江科学院院报》2023年第9期176-180,共5页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(51911530)。

摘　　要：为了提高铁尾砂改性水泥砂浆的性能,将一定比例的α-半水石膏掺入砂浆中制备试件。开展试验分析了α-半水石膏与铁尾砂掺量对砂浆流动性、干燥收缩率、力学性能和与耐久性等技术指标的影响规律,并采用矿物成分与微观图像结果探讨了水化机理。结果表明:在α-半水石膏掺入砂浆后,坍落度指标得到了大幅提升,干燥收缩率明显降低;当取代率为15%时,α-半水石膏改性砂浆的抗压、抗折强度和耐久性指标达到最优;利用α-半水石膏的化学活性能够促进水泥的二次水化作用,同时增加了砂浆致密程度,使得水泥砂浆各项指标得以提升。研究成果可为环保、低碳与高性能水泥砂浆的研制提供参考依据。To enhance the performance of cement mortar modified with iron tailings,a specific proportion ofα-hemihydrate gypsum was incorporated into the mortar to prepare test specimens.The effects ofα-hemihydrate gypsum content and iron tailings content on the fluidity,drying shrinkage,mechanical properties,and durability of cement mortar were investigated.The hydration mechanism was examined through mineral composition and microscopic image analysis.The findings indicate that the addition ofα-hemihydrate gypsum significantly increases the slump index and reduces drying shrinkage rate in the mortar.When the replacement ratio reaches 15%,the compressive strength,flexural strength,and durability of the mortar doped withα-hemihydrate gypsum achieve optimal conditions.The chemical activity ofα-hemihydrate gypsum promotes secondary hydration,subsequently enhancing the density and various indicators of the mortar.The test results serve as a valuable reference for modifying environmentally friendly,low-carbon,and high-performance cement mortar.

关 键 词：水泥砂浆 铁尾砂 Α-半水石膏 坍落度 强度 耐久性 微观结构 

分 类 号：TQ177[化学工程—硅酸盐工业]