Comments on: Impregnable to the waves and every day stronger https://www.isegoria.net/2017/07/impregnable-to-the-waves-and-every-day-stronger/ From the ancient Greek for equality in freedom of speech; an eclectic mix of thoughts, large and small Mon, 20 Apr 2026 16:05:08 +0000 hourly 1 http://wordpress.org/?v=3.6.1 By: Kirk https://www.isegoria.net/2017/07/impregnable-to-the-waves-and-every-day-stronger/comment-page-1/#comment-2566944 Kirk Tue, 18 Jul 2017 19:29:24 +0000 http://www.isegoria.net/?p=42120#comment-2566944 Basalt rebar shows some considerable promise, as well.

]]> By: Name https://www.isegoria.net/2017/07/impregnable-to-the-waves-and-every-day-stronger/comment-page-1/#comment-2566923 Name Tue, 18 Jul 2017 16:40:58 +0000 http://www.isegoria.net/?p=42120#comment-2566923 “impregnable to the waves and every day stronger”

In 20 years, you will all be speaking Latin!

]]> By: Name https://www.isegoria.net/2017/07/impregnable-to-the-waves-and-every-day-stronger/comment-page-1/#comment-2566922 Name Tue, 18 Jul 2017 16:38:47 +0000 http://www.isegoria.net/?p=42120#comment-2566922 i think commercial construction has been using epoxy coated bar for decades…

]]> By: Ross https://www.isegoria.net/2017/07/impregnable-to-the-waves-and-every-day-stronger/comment-page-1/#comment-2566410 Ross Sun, 16 Jul 2017 14:47:19 +0000 http://www.isegoria.net/?p=42120#comment-2566410 Bob Sykes, you might like Concrete Planet by Robert Courland. It’s a historical treatment; some great stories in there, well-researched, and quite competently touches current technical issues for the layman.

]]> By: Ross https://www.isegoria.net/2017/07/impregnable-to-the-waves-and-every-day-stronger/comment-page-1/#comment-2566409 Ross Sun, 16 Jul 2017 13:06:05 +0000 http://www.isegoria.net/?p=42120#comment-2566409 Pozzolonic soils (rich in volcanic ash) are a big deal. In addition to the harbor thanks to the King of Judea, check especially The Pantheon (Hadrian, I think?). That latter is a high point of Roman engineering — 2000+ years old, no rebar, still strong.

Our modern quickset stuff lasts 50–100 years, maximum, and rapidly turns to crap after that.

The minimum we need to do: coated rebar, or some other means of managing oxidation.

]]> By: Bob Sykes https://www.isegoria.net/2017/07/impregnable-to-the-waves-and-every-day-stronger/comment-page-1/#comment-2566407 Bob Sykes Sun, 16 Jul 2017 12:16:42 +0000 http://www.isegoria.net/?p=42120#comment-2566407 As a retired civil/sanitary engineer, I found this story fascinating. I had long thought that the durability of Roman concrete was due to the lack of a strong annual freeze/thaw cycle in most of the Empire. It is especially interesting that Roman concrete resists sulfate attack, which Portland cement concretes are prone to. Now the problem will be how to get civil engineers, who are notoriously conservative in all things, to adopt a major change in concrete technology.

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