Effects of Nano-Silica/Graphene Oxide Composite on Mechanical Properties of Ordinary Portland Cement

Abstract

Abstract: The poor dispersion of graphene oxide (GO) in cement matrix hinders its effective improvement of performance of cement-based composites. SiO₂/GO (GOS) nanosheets were synthesized via a sol-gel process. The dispersion stability of GOS was compared to that of GO in a simulated cement pore solution. Then, cement pastes with the addition of nanosheets were produced and the effects of GO and GOS on its mechanical properties were investigated. The results show that GOS has significantly greater dispersion stability than GO. Compared with the control, the flexural and compressive strength of GO/cement-based composites at 28 d increase by 20.48% and 13.14%, while GOS/cement-based composites increase by 35.42% and 23.90%, respectively.Microscopic analysis shows that flower-like hydration crystals formed in GO/cement-based composites. The hydrated crystals inside GOS/cement-based composites were cross-linked with each other, and the structure was dense, which reduced the brittleness of the cement and improved the toughness.

Key words: graphene oxide, nano-silica, dispersion, cement, mechanical property, crystalline structure

CLC Number:

TQ172

YIN Yujiao, WU Fei. Effects of Nano-Silica/Graphene Oxide Composite on Mechanical Properties of Ordinary Portland Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3352-3358.

References

[1] AN J, NAM B H, ALHARBI Y, et al. Edge-oxidized graphene oxide (EOGO) in cement composites: cement hydration and microstructure[J]. Composites Part B: Engineering, 2019, 173: 106795.
[2] 杨凌俊,袁小亚.氧化石墨烯复掺石墨烯对水泥砂浆力学性能的提升及机理研究[J].功能材料,2019,50(12):12089-12096.
YANG L J, YUAN X Y. Enhanced mechanical performance of cement mortar co-blended by graphene-oxide and graphene and its mechanism[J]. Journal of Functional Materials, 2019, 50(12): 12089-12096 (in Chinese).
[3] PARK S, LEE K S, BOZOKLU G, et al. Graphene oxide papers modified by divalent ions-enhancing mechanical properties via chemical cross-linking[J]. ACS Nano, 2008, 2(3): 572-578.
[4] CHUAH S, LI W G, CHEN S J, et al. Investigation on dispersion of graphene oxide in cement composite using different surfactant treatments[J]. Construction and Building Materials, 2018, 161: 519-527.
[5] SHANG Y, ZHANG D, YANG C, et al. Effect of graphene oxide on the rheological properties of cement pastes[J]. Construction and Building Materials, 2015, 96: 20-28.
[6] LI X Y, LIU Y M, LI W G, et al. Effects of graphene oxide agglomerates on workability, hydration, microstructure and compressive strength of cement paste[J]. Construction and Building Materials, 2017, 145: 402-410.
[7] ZHAO L, GUO X L, GE C, et al. Mechanical behavior and toughening mechanism of polycarboxylate superplasticizer modified graphene oxide reinforced cement composites[J]. Composites Part B: Engineering, 2017, 113: 308-316.
[8] LI X Y, LI C Y, LIU Y M, et al. Improvement of mechanical properties by incorporating graphene oxide into cement mortar[J]. Mechanics of Advanced Materials and Structures, 2018, 25(15/16): 1313-1322.
[9] SHAMSAEI E, DE SOUZA F B, YAO X P, et al. Graphene-based nanosheets for stronger and more durable concrete: a review[J]. Construction and Building Materials, 2018, 183: 642-660.
[10] LU Z Y, HANIF A, NING C, et al. Steric stabilization of graphene oxide in alkaline cementitious solutions: mechanical enhancement of cement composite[J]. Materials & Design, 2017, 127: 154-161.
[11] LI X Y, KORAYEM A H, LI C Y, et al. Incorporation of graphene oxide and silica fume into cement paste: a study of dispersion and compressive strength[J]. Construction and Building Materials, 2016, 123: 327-335.
[12] WANG Q, LI S Y, PAN S, et al. Synthesis and properties of a silane and copolymer-modified graphene oxide for use as a water-reducing agent in cement pastes[J]. New Carbon Materials, 2018, 33(2): 131-139.
[13] KOU L, GAO C. Making silica nanoparticle-covered graphene oxide nanohybrids as general building blocks for large-area superhydrophilic coatings[J]. Nanoscale, 2011, 3(2): 519-528.
[14] WANG W, CHEN S J, BASQUIROTO DE SOUZA F, et al. Exfoliation and dispersion of boron nitride nanosheets to enhance ordinary Portland cement paste[J]. Nanoscale, 2018, 10(3): 1004-1014.
[15] LI W G, LI X Y, CHEN S J, et al. Effects of graphene oxide on early-age hydration and electrical resistivity of Portland cement paste[J]. Construction and Building Materials, 2017, 136: 506-514.