The Synergistic Effect of Gallic Acid and Polycarboxylic Water-reducer on Aqueous GO Dispersion and the Enhanced Mechanical Properties of Cement Mortar Composites
WEI Zhiqiang1, WANG Yuangui2, QI Meng1, ZHENG Xuxu2,YUAN Xiaoya2
1 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China 2 College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Abstract: Asmall amount of graphene oxide (GO) could greatly improve the strength and toughness of cement composites. However, GO was easy to accumulate and precipitate in the environment of high calcium and alkali, so the stability of GO dispersion is the key to obtain high-perfor-mance cement-based materials. In this study, the effect of GA on the dispersion of GO in the saturated CH solution and mechanical properties of hardened cement composite were studied. Compared with PC dispersing system, the addition of a certain content of GA could further improve the dispersing ability of GO in CH solution and subsequently enhanced the flexural and compressive strength of cement mortar in 3 d by 17.3% and 18%, and in 28 d by 19.2% and 21.4%, respectively. The synergistic effect of GA and PC on the GO dispersion could obviously accelerate cement hydration process and uniform growth of the crystal of cement hydration products, which made the microstructure of hardened cement stone more compact. Herein,as a green and inexpensive reagent, GA was choosen as a co-dispersant to provide a new alternative to GO reinforcing cement-based materials and had many potential applications.
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2021, Vol. 35 
