GO纳米片层对水泥水化晶体及胶砂力学性能的影响

Effect of Graphene Oxide Nanosheets on Cement Hydration Crystals and Mechanical Properties of Mortar

摘要:

通过控制氧化反应时间和超声波处理,制备了含氧量（质量分数，下同）分别为1915%,2543%和3230%的氧化石墨烯（GO）纳米片层分散液,研究了不同含氧量GO纳米片层对水泥水化晶体和胶砂力学性能的影响.结果表明:含氧量为2543%的GO纳米片层能够促使水泥水化反应形成规整的花状晶体,同时使得胶砂的拉伸强度和抗折强度显著提高.阐述了GO纳米片层调控水泥水化晶体的作用机理,认为GO纳米片层对水泥水化晶体的形成具有模板作用.

Abstract:

A dispersion of graphene oxide(GO) nanosheets with oxygen content(by mass) of 1915%, 2543% and 3230% were prepared by controlling oxidization times and using ultrasonic dispersion. The effect of GO nanosheets with different oxygen contents on the shape of cement hydration crystals and the mechanical properties of corresponding mortar were investigated. The results indicate that GO nanosheets with oxygen content of 2543% can regulate formation of flower like hydration crystals and increase remarkably the tensile and flexural strength of mortar. A possible formation mechanism of GO nanosheets regulating the hydration microstructure and its impact mechanical properties of cement composites are presented, which thinks that GO nanosheets has template role to regulate the flower like hydration crystals and further the network formed by flower shaped crystals in holes and gap to contribute improvement of the toughness of cement composites.