Among forms like CVD,GO,rGO and GNPS, which of these enhances the properties of the geopolymer concrete, paste and mortar. In addition to that what is the best possible method for implementing graphene in geopolymer concrete, paste and mortar.
I guess it depends on your approach to mix it together. I'm not an expert in geopolymers but I know quite a lot about CVD graphene and a bit about top-down graphene (rGO, GO, GNPs).
You cannot do much with CVD graphene as a large surface area (only 1-3 layers usually) only gives you a very small amount of material which will only have a negligible effect on the properties of your 3D "bulk" geopolymer. If you want to put a decent fraction of graphene into your geopolymer to do a composite, you need to use derivative of graphite.
Usually, you can find derivatives of graphite in the form of solutions or powder. How do you intend to mix your geopolymer with the graphene?
Which property are you trying to harness? Is it purely mechanical? electrical? friction?
GO is fulll of defects and oxygen groups so it might bond better with other polymers/materials. rGO is full of defects so its electrical properties might be very bad (or at least far from pristine graphene). GNPs is just very mall fragment of graphite...if your target is to improve the mechanical properties, you could do some simulations first to see what is the mechanisms for fractures and get the appropriate graphite fragment size.