For durability it is important to mix the cement and concrete thoroughly and cure the compacted geopolymer hempcrete such that it does not loose moisture while polymerising.
Mixing thoroughly the flyash and activator first before adding slag and finally hemp hurd will ensure consistent results.

If not properly cured then soluble silica will migrate to the surface giving an impression of a hard and durable mix that will however, dissolve in water.

2013-12-20 14.26.58

Boiling in water for 30 minutes

2013-12-20 14.58.20

Finished boiling in water for 30 minutes