Nanotechnology in concrete – A review

Graphene oxide (GO) is the product of chemical exfoliation of graphite. Due to its good dispersibility in water, high aspect ratio and excellent mechanical properties, GO is a potential candidate for use as nanoreinforcements in cement-based materials. In this paper, GO was used to enhance the mechanical properties of ordinary Portland cement paste. The introduction of 0.05 wt% GO can increase the GO-cement composite compressive strength by 15-33% and the flexural strength by 41-59%, respectively. Scanning electron microscope imaging of the GO-cement composite shows the high crack tortuosity, indicating that the two-dimensional GO sheet may form a barrier to crack propagation. Consequently, the GO-cement composite shows a broader stress-strain curve within the post-peak zone, leading to a less sudden failure. The addition of GO also increases the surface area of the GO-cement composite. This is attributed to increasing the production of calcium silicate hydrate. The results obtained in this investigation suggest that GO has potential for being used as nano-reinforcements in cement-based composite materials.

Mechanical properties and microstructure of a graphene oxide-cement composite

Effect of nano-silica on rheology and fresh properties of cement pastes and mortars

Nano reinforced cement and concrete composites and new perspective from graphene oxide

Beneficial role of nanosilica in cement based materials – A review

Characteristics of cement mortar with nano-SiO2 particles

Results from experimental and analytical investigation on the setting stress of recycled-PET polymer concrete are presented. Setting shrinkage test on polymer concrete was, carried out and the fractal dimension of the crack patterns detected on microsco pe images was measured. Numerical simulations of the tests were performed by means of a lattice model and non integer dimensions were measured on the predicted lattice damage patterns. The setting shrinkage cracks that are obtained with lattice are is good agreement with the experimental results.

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Papers

Characteristics of cement mortar with nano-SiO2 particles

Finite element analysis for setting shrinkage stress of recycled-PET polymer concrete