Having been an exterminator in CO for a couple decades, I have an understanding of the risk of using papercrete without consideration that the termites are God's answer to cellulose.
Now, cement is alkalai, but as you mentioned, this may not be enough to prevent the problem of them eating something made of papercrete. Still, I would expect deterioration to take longer than 3 months.
One possibility to combat the termite problem would be to add a small amount of boric acid to the mix rather than tampering with the recipe contents of cement, water, and paper. Cellulose insulation has a small amount of boric acid added. It is quite similar to papercrete, so at least some level of success has been achieved using it on termite food.
The amount needed is a relevant question. There has to be an MSDS for cellulose insulation which would indicate the weight (by %) of Boric Acid contained. My own experience with boric acid as a pesticide and wood destroying organism repellant created my guess to be quite low in volume compared to the other ingredients.
If I lived in termite heaven, as your posting suggests you do, I would try several different mixes and place blocks on the ground to see how the termites react. That is how they measure the performance of all termiticides, so it would probably work well to test on papercrete.
Gary
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