erwin wrote:
The investigation continues.
If you have access to portland cement locally, and sand and clay are in the soil on the property, you might consider building using Rammed Earth. That's what the Romans built most of their things with. Take note they are 2000 years old and still standing. So, it's a pretty decent method of construction.
In New Mexico and Arizona here in USA, there are some builders who focus only on that technique. They use pneumatic rams to compact the earth and using them is actually not as good as manual by hand method unless you take your time (more money if you hire a contractor). The commercial method promotes voids, the manual by hand method is considerably less noisy and you can then hear the earth "sing" when it is compacted to the level it needs.
Rammed earth is in simple speak, making instant rock. And over time it gets stronger and stronger. If you are building the manual by hand method as soon as you finish a single course (using slip molds) it is already strong enough to raise the molds and do another course.
Takes very little water and not that much cement. It is a labor intensive thing but, the results are as permanent as solid rock!
Thomas Jefferson built Monticello out of rammed earth using limestone and ash I think it was (they didn't have portland cement back then). Rammed earth has only recently (within the last 100 years) vanished from consideration due to commercialization I think. It's DIRT CHEAP in terms of materials.