Open AccessIncorporating graphene oxide into lime solution: A study of flocculation and corresponding improvement
Author(s) -
Guojian Jing,
Z. M. Ye,
Xiaolei Lu,
Jiaming Wu,
S. X. Wang,
Xin Cheng
Publication year - 2018
Publication title -
materiales de construcción
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.539
H-Index - 30
eISSN - 1988-3226
pISSN - 0465-2746
DOI - 10.3989/mc.2018.05217
Subject(s) - graphene , superplasticizer , oxide , materials science , flocculation , cement , dispersion (optics) , calcium hydroxide , calcium oxide , chemical engineering , lime , composite material , graphene oxide paper , composite number , nanotechnology , metallurgy , physics , optics , engineering
The dispersion behavior of graphene oxide in cement matrix is one important factor in enhancing cement performance. In this work, we investigated the dispersion of graphene oxide in cement by simulating alkaline environment with a solution of calcium hydroxide and studied the corresponding strategy of improving dispersion. The obtained results showed that graphene oxide would flocculate even if calcium hydroxide concentration was very low, which might be the main reason of the unstable properties of the graphene oxide-doped cement. In addition, we discovered that, compared to -OH group, the -COOH group and the long chain of polycarboxylate-based superplasticizer were more effective in delaying the flocculation of graphene oxide. Finally, we proposed a dispersion mechanism of polycarboxylate-based superplasticizer. The study provides inspiration for the design of graphene oxide-doped cement materials.