胺功能化氧化石墨烯对水泥基复合材料性能的影响

doi:10.19964/j.issn.1006-4990.2022-0312

摘要/Abstract

摘要：

氧化石墨烯（GO）在水泥浆料中的团聚会影响其对水泥复合材料的力学增强作用。为了解决氧化石墨烯在水泥浆料中的分散性问题，用三乙醇胺（TEOA）通过化学法对氧化石墨烯进行胺功能化（TEOA-GO），并制备了氧化石墨烯水泥基复合材料（GO/C）和胺功能化氧化石墨烯水泥基复合材料（TEOA-GO/C）。分别采用X射线衍射（XRD）、扫描电子显微镜（SEM）、傅里叶红外光谱（FT-IR）等手段对样品结构进行表征。结果表明:与氧化石墨烯相比，胺功能化氧化石墨烯在氢氧化钙溶液中的分散性更好；水泥基复合材料的力学性能测定结果显示，当掺杂0.03%（质量分数）的胺功能化氧化石墨烯时，水泥基复合材料28 d抗折强度最大为7.96 MPa，相较于空白样和氧化石墨烯水泥基复合材料分别提高了15.3%和5.43%；当掺杂0.05%（质量分数）胺功能化氧化石墨烯时，水泥基复合材料28 d抗压强度最大为74.14 MPa，相较于空白样和氧化石墨烯水泥基复合材料分别提高了40.68%和11.99%；扫描电镜表征结果进一步表明，加入胺功能化氧化石墨烯，有利于提高水泥的水化程度，阻碍裂缝的扩展，提高水泥的力学性能。

关键词: 三乙醇胺, 氧化石墨烯, 水泥, 团聚

Abstract:

Agglomeration of graphene oxide（GO） in cementitious solutions affects the mechanical enhancement of cement composite.In order to solve the problem of dispersibility of GO in the cement paste，GO was chemically functionalized with triethanolamine（TEOA-GO），then the GO cement-based composites（GO/C） and TEOA-GO cement-based composites（TEOA-GO/C） were prepared.The structure and surface morphology of sample were characterized by X-ray diffraction（XRD），scanning electron microscope（SEM），fourier transform infrared spectrometer（FTIR）.The results indicated that TEOA-GO had better dispersibility in Ca（OH）₂ solution than GO.The results of mechanical strength showed that 0.03%TEOA-GO was doped into the composites，the 28 d flexural strength of TEOA-GO/C were 7.96 MPa，which were increased by 15.3% and 5.43%，respectively，compared to the control and GO/C.When it was doped with 0.05% TEOA-GO，the 28 d compressive strength of TEOA-GO/C was 74.14 MPa，which was 40.68% and 11.99% higher than that of the control and GO/C，respectively.SEM results further showed that the addition of TEOA-GO was beneficial to improve the hydration degree of cement，hindered the expansion of cracks and enhanced the mechanical properties of cement.

Key words: triethanolamine, graphene oxide, cement, agglomeration

中图分类号:

TU599

赵丽平, 王飞. 胺功能化氧化石墨烯对水泥基复合材料性能的影响[J]. 无机盐工业, 2023, 55(3): 66-70.

ZHAO Liping, WANG Fei. Effect of amine-functionalized graphene oxide on mechanical properties of cement composites[J]. Inorganic Chemicals Industry, 2023, 55(3): 66-70.

图/表 8

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项目	化学成分质量分数/%							LOI
项目	CaO	SiO₂	Al₂O₃	MgO	Fe₂O₃	SO₃	K₂O	LOI
水泥	60.33	23.24	6.16	1.36	4.41	0.35	—	0.56

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