硅灰/氧化石墨烯在水泥硬化浆体中的分散性研究

doi:10.19964/j.issn.1006-4990.2023-0045

Abstract

Abstract:

The research of graphene oxide（GO） as cement reinforcing material has made some progress，and silica fume（SF） is commonly used as cement admixture.It has been reported that SF/GO is compounded to prepare cement-based materials，but the theoretical study of SF-assisted dispersion of GO remains incomplete.Consequently，different dosage of SF/GO suspension was prepared by ultrasonic method，the dispersibility of the suspension in cement pore solution was analyzed.SF/GO hardened cement paste was also prepared.The results of microscopic analysis indicated that SF stripped the GO sheets in cement pore solution，the dispersion and stability of GO were improved.When m（GO）/m（cement） was 0.25% and m（SF）/m（cement） was 10%，the 28 d flexural and compressive strength of the composites were 12.3 MPa and 73.2 MPa，respectively，which were increased by 48.19% and 18.06% compared to the sample without SF.SF served a dual purpose in the cement composites by reacting with Ca（OH）₂ to avoid competition for GO from Ca²⁺ dissociated by hydration，and by filling gaps in the C—S—H structure to improve the composites′ internal density.

Key words: graphene oxide, silica fume, cement, dispersity, cement pore solution

CLC Number:

TQ177.6

DU Changqing, WANG Zhangxuan, TONG Teng, LIU Xiaofan, LIU Liang. Study on dispersion of silica fume/graphene oxide in hardened cement paste[J]. Inorganic Chemicals Industry, 2023, 55(11): 115-120.

Figures/Tables 8

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m（氧化石墨烯）/ m（水泥）/%	m（硅灰）/ m（水泥）/%	ρ（Ca²⁺）/ （mg·L^-1）	pH
0.00	0	318	12.57
0.25	0	299	12.41
0.00	2	313	12.55
0.00	5	305	12.48
0.00	10	293	12.34
0.25	2	316	12.57
0.25	5	305	12.51
0.25	10	301	12.46

样品	w （C）	w （O）	w （Na）	w （Mg）	w （Al）	w （Si）	w （S）	w （Ca）
SF-0/0.25%GO水泥基复合材料	6.50	38.77	1.12	1.34	2.78	3.31	2.01	44.17
SF-2/0.25%GO水泥基复合材料	6.56	35.02	1.42	3.08	3.89	5.06	1.76	43.21
SF-5/0.25%GO水泥基复合材料	5.13	35.09	1.02	2.48	4.34	8.39	1.48	42.07
SF-10/0.25%GO水泥基复合材料	4.30	30.58	1.18	2.87	3.95	12.44	1.35	43.33

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Study on dispersion of silica fume/graphene oxide in hardened cement paste

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