Hi Plough, No misunderstanding. The hydrogen produced can be...

Hi Plough,

No misunderstanding.  The hydrogen produced can be used to fuel the reactor, or alternatively sold commercially.

http://www.edenenergy.com.au/pyrolysis.html

"Additionally, the only other major by-product from Eden’s pyrolysis process is hydrogen, the real cost of which will be dependent upon the value of the carbon produced. The quantity of hydrogen produced will be 33.33% (by weight) of the quantity of carbon produced. This hydrogen can be either captured and fed into the various hydrogen/Hythane® applications that Eden has been developing around the world, with the intention of accelerating the commercial rollout of these downstream hydrogen applications based on the prospect of relatively low cost hydrogen, or else it can be used to help fuel the pyrolysis reactor."

There is experience with using flyash in US DOT transport projects, though they have not been universally favourable. Also, I understand conductivity is not improved and abrasion resistance is no better than that of the aggregate, and properties at high temperature (eg in case of fire) are doubtful. It has low short term stength and curing times in excess of a week, and is very sensitive to conditions.

https://www.fhwa.dot.gov/publications/research/infrastructure/structures/97148/cfa53.cfm