Two blocks

TEST 1

MIX: by volume
9 parts Hurd
1 part builders cement ( contains 20% flyash)
2 parts hydrated lime

drum mixer
make paste,
add hurd and
mix thoroughly >10 min
press firmly into moulds
add only sufficient water to make the mix workable.
Test in 30 days

I want to have 3:1 as my reference as it is the leanest mix

I will next make tests with

TEST 2

8 parts Hurd ( papercrete mix strength )
1 part builders cement ( contains 20% flyash)
2 parts hydrated lime

TEST 3

7 parts Hurd
1 part builders cement ( contains 20% flyash)
2 parts hydrated lime