<div dir="ltr">At last! We can build the Caves of Steel from Isaac Asimov's seminal science fiction novel, "The Caves of Steel are Awful". :D</div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sun, Jan 12, 2025 at 1:42 PM BillK via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Rebuild Los Angeles With Ultra High Strength Concrete and UHPC Domes<br>
Where Possible<br>
January 12, 2025 by Brian Wang<br>
<br>
<<a href="https://www.nextbigfuture.com/2025/01/rebuild-los-angeles-with-ultra-high-strength-concrete-and-uhpc-domes-where-possible.html" rel="noreferrer" target="_blank">https://www.nextbigfuture.com/2025/01/rebuild-los-angeles-with-ultra-high-strength-concrete-and-uhpc-domes-where-possible.html</a>><br>
Quotes:<br>
Ultra-high performance concrete (UHPC) is an enhanced fibrous and<br>
cementitious concrete with high compressive strength (120–250 MPa)<br>
particle packing density (0.825–0.855, tensile strength (15–20 MPa)<br>
and extraordinary durability. UHPC has 300 times the ductility and<br>
energy absorption of high performance concrete (HPC) and three to<br>
sixteen times the compressive strength of regular concrete. About $500<br>
million of the billions spent on the Freedom Tower was the UHPC<br>
concrete. It has stronger material than the old Minute Man nuclear<br>
silos. The large amount of UHPC has moved it into the mainstream<br>
higher end option for skyscrapers, bridges and roads.<br>
<br>
The Cost to Make a Building Fire Resistant Would be More Than<br>
Committing to Ultra-high Strength Concrete for Better Protection.<br>
-------------------<br>
<br>
Sounds like a good idea.  Is it feasible?<br>
<br>
BillK<br>
<br>
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</blockquote></div>