Dispersion of triethanolamine-functionalized graphene oxide (TEA-GO) in pore solution and its influence on hydration, mechanical behavior of cement composite. (20th August 2019)

• Record Type: Journal Article
• Authors: Hu, Miaomiao; Guo, Jintang; Fan, Jinjie; li, Pengpeng; Chen, Di
• Is Part Of: Construction & building materials. Volume 216(2019)
• Page Start: 128
• Page End: 136
• Publication Date: 2019-08-20
• Subjects: Triethanolamine -- Graphene oxide -- Dispersion -- Mechanical behavior -- Pore solution -- Crack propagation; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.04.180
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Chemically functionalized GO was synthesized. The growth of TEA-GO aggregates was restricted in pore solution. TEA-GO leads to the increment in hydration degree of oil well cement (OWC). The mechanical properties of TEA-GO/OWC composites were enhanced. TEA-GO are tough enough to hinder the crack propagation due to energy dissipation. Abstract: Re-aggregation of graphene oxide (GO) in cementitious solutions compromises the mechanical enhancement of cement composite. We chemically functionalized GO via triethanolamine (TEA), the removal of COC groups on basal planes and the attachment of extra OH groups on edges promoted its dispersibility during hydration and in cement paste. When incorporated into cement, TEA-GO provides more nucleation sites due to the better dispersion, further promoting the hydration degree. TEA-GO enhanced the compressive strength and flexural strength by 9.4–31% and 8.1–36.7% respectively, which was significantly higher than that of GO(4.1–17.2%; 7.8–20%).