How has Roman concrete lasted 2,000 years ?

[UM-Bot]

The remarkable longevity of Roman sea piers has proven something of a mystery to modern engineers.

http://www.unexplained-mysteries.com/news/309168/how-has-roman-concrete-lasted-2000-years

[u2canbfmj]

Today, filling in pot holes is positive for GDP. Creating roads and etc that last 2000 years? No shovel ready Jobs LOL

[paperdyer]

58 minutes ago, u2canbfmj said:

Today, filling in pot holes is positive for GDP. Creating roads and etc that last 2000 years? No shovel ready Jobs LOL

True. but it sounds like the composition of the concreate is not completely know. You can say they just don't make concrete the way they used to.

[Krater]

These findings do not explain the Pantheon, whose unreinforced concrete dome has stood for more than 2000 years and is still the largest in the world.

Of course, it doesn't pay to build something that lasts, anymore. There's more money in shoddy workmanship that needs constant upkeep or rebuilding.

[Myles]

3 hours ago, Krater said:

These findings do not explain the Pantheon, whose unreinforced concrete dome has stood for more than 2000 years and is still the largest in the world.

Of course, it doesn't pay to build something that lasts, anymore. There's more money in shoddy workmanship that needs constant upkeep or rebuilding.

I don't think the motivation is the opportunity to upkeep or to rebuild.   I think it is just a $$ savings.     Also the need or want to build something that will last a thousand years is not there. 

 

OK, I'll be the first to bring aliens into this.   We all know that humans could not possibly have built something that lasts this long.    -   Just joking. 

[highdesert50]

Interesting that the Romans were using basic scientific methods of observation, forming a hypothesis, and testing the hypothesis to arrive at a conclusion. Unfortunate that we do not have more info on the processes with which they experimented before they arrived at the desired recipe.

[aztek]

ash from volcano that was used in roman concrete has properties that actually make concrete stronger over time,

also no metal rebars in their concrete  helped as well.,  rebars rust, expand, and crack modern concrete. 

there is nothing secret about roman concrete.