Originally posted by MarkJerling I am reading tonight, Marcus Vitruvio Polio's preface to his masterpiece, "On Architecture", De Architectura. Written (perhaps) somewhere between 27 and 23 BC, it is the only detailed work on Architecture, Town Planning and Construction Technology from the Roman era to have made it to the modern era. Some of you may know that the recipe for Roman concrete was lost some 1800 years ago, with the fall of the Western Roman Empire.
Today, I learnt that scientist think they may have discovered the secret to Roman concrete's fantastic properties. See
Why modern mortar crumbles, but Roman concrete lasts millennia | Science | AAAS
It's only proper to remember that our only hints as to it's makeup are due to Vitruvius' writings.
I love the preface. Vitruvius starts off by telling Caesar (This would be Gaius Julius Caesar Octavianus Augustus, known as Augustus) that he has been writing these books but did not want to bother Caesar as he knew he was busy acquiring dominion of the world, vanquishing enemies; the senate and the people were enjoying peace and Caesar was busy with politics. Then he touches on the jobs Caesar had given him to do such as maintaining various engines of war. And he goes on to thank Caesar for paying him a decent wage so that he need not fear poverty. With the odd hint along the way that he owes his gratitude for those jobs to Augustus's sister.
interesting!
when we first built our pond we used volcanic rock for the head of the stream (the rock was easily machined)
it turned out that it eroded very quickly and when combined with our very hard water created a dense slurry
in addition to its abrasiveness this slurry would set into a very hard substance that killed filters and pumps
a fellow at a rock shop let us know (nicely) that we were just poor dumb s***s and directed us to a dealer of large garden stones
my father in law used the fly ash from the steel company he worked at and mixed it with very fine blow sand from the river to make a crack filler for paved patios and driveways
over time it hardened and nothing shifted under load
lastly, a contractor near here used a disc and turned over people's lanes and driveways
then he dumped a mix of Portland and blow sand into the dirt
disced again and rolled it to compact his work
after a couple of rain and dry cycles it was rock hard
this was almost forty years ago and those lanes still need little or no maintenance