My Question: Why do modern steel and concrete bridges have a life expectancy of only 50-75 years?

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Frequently Asked Question:

Why do modern steel and concrete bridges have a life expectancy of only 50-75 years?

while the Romans built such structures out of bricks and mortar, and they’ve lasted for millennia? Modern sports stadiums are supposedly only good for 30 years. Compare that to the Roman Coliseum and the Pyramids. So much for modern technology?

Answer by momof3anglz
Well, anymore it’s all about the bottom line. What can they cut to make it ‘cost effective’ vs ‘quality’.

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4 Responses to My Question: Why do modern steel and concrete bridges have a life expectancy of only 50-75 years?

  1. Pedro S says:

    cement is not stone…and have u seen roman roads LOL…ever see steel rust? the Romans never built the golden gate bridge…they couldn’t only steel and concrete can do ti

  2. Wraith says:

    Maybe because modern bridges handle constant traffic that’s extremely heavy, while roman bridges were smaller and handled much less traffic until they were stopped being used altogether.

    I don’t think that modern sports stadiums only last 30 years, there are lots of stadiums older than that. The Coliseum hasn’t been used for centuries.

  3. Wiarumas says:

    Bridges built 50-75 years ago weren’t meant for today’s traffic loads.

    The everyday wear of cars on them, the actual weathering, and probably even polluted (acid) rain accelerates the process.

    The aquaduct was used to transport water, which weighs about 8lbs a gallon (compared to cars which pay thousands of pounds), and the Pyramids was a pyramid structure of stone (build a steel pyramid and it could last forever also). Also, the structures you mentioned are crumbly. There is no weight on them. Add thousands of tons of weight on them (like a USA bridge) and I bet it wouldn’t last a few minutes.

    If you want to point the finger at anyone, blame unionized construction workers and the power of the dollar. I’m not saying they should build them for cheap or its their fault that the MN bridge fell, but the Romans and Egyptians used forced labor for their “indestructable” structures… and that wouldn’t be acceptable in today’s world.

  4. double E says:

    Everything built these days is so by the LOWEST bidder. Couple that with American workers are both greedy and lazy and there you go. Poor quality materials and a mediocre job performed by someone who doesn’t really want to do it. Go figure. Old planes last longer, old cars, old houses are far better than new “cardboard” dwellings, old appliances were built better, and franky people were better 50 years ago too.

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