I was just giving a concrete example (pun intended). There’s still some rock crushing for aggregate, but the energy is mostly in cement. Concrete uses most of the cement, so it’s a good target. Japan uses something like four times the concrete of California, despite similar population, land area, and geography.
I've heard similar about concrete as well, but have had a difficult time putting it in context.
"Cement (3%): carbon dioxide is produced as a byproduct of a chemical conversion process used in the production of clinker, a component of cement. In this reaction, limestone (CaCO3) is converted to lime (CaO), and produces CO2 as a byproduct. Cement production also produces emissions from energy inputs – these related emissions are included in ‘Energy Use in Industry’."
Unfortunately, it doesn't further breakdown what percentage of the cement energy inputs contribute to GHG emissions.
(One exception: I believe when you combine commercial and residential facilities, their respective energy use surpasses transport)
By concrete, do you mean cement specifically? Or is there additional CO2 from the process of using aggregate?