Influence of graphene oxide as dispersed phase in cement mortar matrix in defining the crystal patterns of cement hydrates and its effect on mechanical, microstructural and crystallization properties

Abstract

The influence of dispersed graphene oxide (GO) on the mechanical, microstructural and crystallization properties of GO–cement nanocomposites has been investigated.

Strength Characterization of Cement Stabilized and Fiber Reinforced Clay–Pond Ash Mixes

“…XRD is a technique used to determine the composition of crystalline phases in a material [30]. The presence of different phases present in samples was analysed using XRD (PANalytical XPERT-PRO Diffractometer) in 2h range between 10°and 70°.…”

Synergistic effects of silica nanoparticles/polycarboxylate superplasticizer modified graphene oxide on mechanical behavior and hydration process of cement composites

“…SiO 2 NPs with high specic surface area have been widely utilized to reinforce cement composites and have produced remarkable improvement in mechanical strength on account of nucleus effects and lling effects. 13 Moreover, SiO 2 NPs with pozzolanic activity can consume calcium hydroxide (CH) to form stable calcium silicate hydrate (C-S-H) gels.…”

“…However, the traditional reinforcements are either in the macro-scale or micro-scale; they can enhance the crackresistance in the macro/micro scale, but they fail to stop the initiation and propagation of nano-cracks. [1][2][3] Therefore, this creates a need to use a material with nano-size dimension as the reinforcing agent for cement-based materials.…”

“…It is reported that the addition of GO can accelerate cement hydration, regulate the microstructure of hydration crystals and signicantly improve the mechanical behavior of cement composites. 2,3,[5][6][7][8] However, it is difficult to disperse GO nanosheets in alkaline cement matrix due to the electrostatic interactions between the negatively charged GO layers and Ca 2+ , K + , Na + OH À ions in cement pore solution. So either chemical modication or the use of surfactant is needed to achieve uniformly dispersed GO nanosheets in alkaline cement matrix.…”

Graphene oxide as nano reinforcing material in cement-based composites: A review

“…But nanomaterial generally agglomerates due to the strong Van der Waal's forces at nano scale and reduced workability which may be due to adsorption of free water onto the surface of nanomaterial in concrete which may be overcome by a perfect combination of sonication for mechanical separation and compatible admixtures of the respective nanocomposites [1]. It has been observed that graphene oxide which is a monolayer of graphene with oxygen containing functional groups [5] has the ability to absorb water molecule producing a water reservoir and water transport channel for further hydration of cement, accelerates the hydration rate due to its catalytic behavior when added to cement as reinforcing material [2]. Effects of GO addition into cement matrix can effectively improve the transport properties in cement which eventually improve its durability (its transport properties reduce the movement of aggressive chemicals due to formation of strong barrier enhancing its resistance to aggressive elements).…”