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2.1. Dry dispersion technique of grapheneJing et al. conducted experiments to study the effect of graphene on the hydration behaviour of cement composites. They employed dry dispersion technique to directly mix 0.4 wt% graphene within the dry Ordinary Portland Cement (OPC) for 72 h by use of an electric concrete mixer. The results indicated that the addition of graphene does not lead to much difference to the degree of cement hydration reaction, and the flowability of the graphene reinforced cement paste decreases by 39.1% compared with plain cement paste [36]. The reasons are mainly due to the low performance of the dry dispersion technique to achieve uniform dispersion of graphene in the cement matrix. The agglomerated graphene will not only hinder the movement of fresh cement composites by locking the water inside the flocs, but also constrain the performance of the nucleation effect that occurs on the surface of graphene as the flocculated graphene offers a lesser surface area in comparison with uniformly dispersed graphene to promote the cement hydration.
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