Everything old is new again: Researchers find ancient concrete technique superior to modern formula

To improve today’s concrete, do as the Romans did

By Sarah Yang, Media Relations | June 4, 2013

Chris Brandon of the ROMACONS project collects a sample of ancient Roman concrete drilled from a breakwater in Pozzuoli Bay, near Naples, Italy. The breakwater dates back to around 37 B.C. (D. Bartoli photo, courtesy of J.P. Oleson)

BERKELEY —In a quest to make concrete more durable and sustainable, an international team of geologists and engineers has found inspiration in the ancient Romans, whose massive concrete structures have withstood the elements for more than 2,000 years.Using the Advanced Light Source at Lawrence Berkeley National Laboratory (Berkeley Lab), a research team from the University of California, Berkeley, examined the fine-scale structure of Roman concrete. It described for the first time how the extraordinarily stable compound – calcium-aluminum-silicate-hydrate (C-A-S-H) – binds the material used to build some of the most enduring structures in Western civilization.

The discovery could help improve the durability of modern concrete, which within 50 years often shows signs of degradation, particularly in ocean environments.

Sample of ancient Roman maritime concrete from Pozzuoli Bay near Naples, Italy. Its diameter is 9 centimeters, and it is composed of mortar formulated from lime, volcanic ash and chunks of volcanic tuff. (Carol Hagen photo)

The manufacturing of Roman concrete also leaves a smaller carbon footprint than does its modern counterpart. The process for creating Portland cement, a key ingredient in modern concrete, requires

The Biggest Economic Challenge of Obama’s Second Term

Investing in economic infrastructure is ALWAYS a sound decision because
1.) Materials and Manpower ALWAYS comes from the private sector (and always will), and;
2.) Economic capacity and economic opportunity expands.

Note also these two remarks:

“Corporations won’t hire more workers just because their tax bill is lower and they spend less on regulations. In case you hadn’t noticed, corporate profits are up. Most companies don’t even know what to do with the profits they’re already making. Not incidentally, much of those profits have come from replacing jobs with computer software or outsourcing them abroad.

“Meanwhile, the wealthy don’t create jobs, and giving them additional tax cuts won’t bring unemployment down. America’s rich are already garnering a bigger share of American income than they have in eighty years. They’re using much of it to speculate in the stock market. All this has done is drive stock prices higher.”

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Monday, September 10, 2012

The question at the core of America’s upcoming election isn’t merely whose story most voting Americans believe to be true – Mitt Romney’s claim that the economy is in a stall and Obama’s policies haven’t worked, or Barack Obama’s that it’s slowly mending and his approach is working.

If that were all there was to it, last Friday’s report from the Bureau of Labor Statistics showing the economy added only 96,000 jobs in August – below what’s needed merely to keep up with the growth in the number of eligible workers — would seem to bolster Romney’s claim.

But, of course, congressional Republicans have never even given Obama a chance to try his approach. They’ve blocked everything he’s tried to do – including his proposed Jobs Act that would help state and local governments replace many of the teachers, police officers, social workers, and fire fighters they’ve had to let go over the last several years.

The deeper question is what should be done starting in January to boost a recovery that by anyone’s measure is still anemic. In truth, not even the Jobs Act will be enough.

At the Republican convention in Tampa, Florida, Romney produced