改性氧化石墨烯对水泥砂浆性能的影响

doi:10.19964/j.issn.1006-4990.2024-0236

摘要/Abstract

摘要：

在水泥砂浆中，砂与水化物之间的界面结合程度往往影响着其使用性能。为研究氧化石墨烯（GO）对水泥砂浆性能的改善作用，通过3-氨基丙基三乙氧基硅烷（APTES）对GO进行改性。研究了GO和改性GO在不同掺量下对水泥砂浆力学性能的影响，探讨了改性GO对水泥砂浆界面过渡区和孔隙的改善作用，并借助傅里叶红外光谱仪（FT-IR）、拉曼光谱仪（Raman）、X射线光电子能谱仪（XPS）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）等表征手段分析样品微观结构。结果表明，APTES通过Si—O基团以Si—O—Si共价键对GO进行硅烷功能化。改性GO的最佳掺量为0.04%（质量分数），在该掺量下，相比于空白样，水泥砂浆的吸水率降低12.6%，28 d抗折和抗压强度提高44.4%和31.2%，有害孔和多害孔依次降低41.24%和37.27%。微观分析结果表明，改性GO提高了砂与水化产物之间的界面黏结性，优化了水化产物的孔隙率，使水泥砂浆整体上结构更致密、韧性更强。

关键词: 水泥砂浆, 氧化石墨烯, 改性, 界面过渡区, 硅烷

Abstract:

The bond at the interface between sand and hydration products in cement mortar significantly affects its performance characteristics.To explore the potential enhancement of cement mortar properties by graphene oxide（GO），GO was modified with 3-aminopropyltriethoxysilane（APTES）.The effects of different contents of GO and modified GO on the mechanical properties of cement mortar were evaluated.The influences of modified GO on the interfacial transition zones and pores of cement mortar were also examined.In addition，the microstructure of sample was characterized using various analytical methods，including Fourier Transform Infrared Spectroscopy（FT-IR），Raman Spectroscopy，X-ray Photoelectron Spectroscopy（XPS），Scanning Electron Microscope（SEM），and Transmission Electron Microscope（TEM）.The results showed that APTES was functionalized GO with a silane group through a covalent bond of Si—O—Si.The optimal dosage of modified GO was 0.04%，which resulted in a 12.6% decrease in the water absorption rate of the cement mortar compared to the control.Furthermore，the 28 d flexural and compressive strengths were improved by 44.4% and 31.2%，and the harmful and more harmful pores were reduced by 41.24% and 37.27%，respectively.Microscopic test results showed that modified GO improved the interfacial bonding between sand and hydration products，and optimized the porosity of the hydration products.This improvement resulted in a denser structure and stronger toughness of the cement mortar.

Key words: cement mortar, graphene oxide, modify, interfacial transition zones, silane

中图分类号:

TQ127.11

刘建伟, 谢晓杰. 改性氧化石墨烯对水泥砂浆性能的影响[J]. 无机盐工业, 2025, 57(7): 93-98.

LIU Jianwei, XIE Xiaojie. Effect of modified graphene oxide on properties of cement mortar[J]. Inorganic Chemicals Industry, 2025, 57(7): 93-98.

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