Ann: Results of Concrete Decarbonisation Study, page-174

that u NEED Halloysite.u don’t.it’s the klinker ur looking to switch out.that’s the largest Co2 bit in cement.
cement companies in europe and Africa are mining kaolin and putting it in a kiln adding it to their cement mixes and reducing their Co2 emissions.someone could argue tubes help / do it better (that’s for the academics) but to say u NEED Halloysite to make HRM is false.even if u said tubes made it mildly better it still wouldn’t work.if the goal is to reduce Co2 then moving it around the planet now negates it.