Where lime does increase alkalinity , thus killing off organic life , one would think that there is plenty of lime (30% unreacted on set)in the portland itself - Lime is added to portland at the point of manufacture specificly to control the speed of set - when lime is added to make mortar, it is added to weaken the mortar so as to control differential shrinkage under freeze thaw conditions - While at evesgarden.org I built a dome using mortar mix and paper, it took 3 years to finish original set and then demonstrated radical shrinkage - I think lime is the enemy of papercrete since I have experienced it first hand - pozzolan is indicated and it is how the industry has dealt with these problems for 30 years - Good Question though - Thank you - Clyde T.
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