Ann: Accelerating CO2 emissions reduction in cement & concrete, page-36

Individual flakes might be 200 x stronger than steel, but pray tell how do you expect to achieve a graphene infused structure to be 10x stronger than steel that someone can afford?

In structures that require light weight e.g. fighter jets that also include/require ability to absorb damage, but so far nobody has proposed.
Back in the real world try giving examples. My bet is you won't come up with anything more than FGR themselves have come up with and from that you can see the level of demand out there. Cement - that's it.