5 ms·
I live in Montreal; many of the concrete structures in my city are crumbling and decaying due to the constant freeze/thaw temperature cycling that they're expos
by JanSolo 4y ago
I live in Montreal; many of the concrete structures in my city are crumbling and decaying due to the constant freeze/thaw temperature cycling that they're exposed to.
I wonder if the self-healing property of this new advanced concrete would help to avoid some of the cracking & flaking we're seeing in constructions from the 60s & 70s.
- kibwen 4y agoOnly if you take out the rebar. Concrete is porous, water penetrates to the rebar inside, the rebar rusts and expands, cracking the concrete. But if you remove the rebar, you remove much of the tensile strength of the structure, which means you need to use way more concrete to compensate (via the sheer compressive force of its own weight).
- elzbardico 4y agoWhat about those new materials for rebar? Like fiberglass? What do you think of them?
- bombela 4y agoNot the parent. My understanding is metal rebar is the cheapest. You need a lot of rebar in modern concrete construction.
- betaby 4y agoI live in Montreal too, and while all what you say is true ... the same is not true for the xUSSR cold cities I lived before immigration. So quality makes difference. Also planing and designing for less maintenance. Concrete structures from the same era across xUSSR are in way better shape.
- newsclues 4y agoMontreal has infrastructure problems because of systemic corruption with the local Mafia. To think that the USSR had better infrastructure (less corruption) than modern day corrupt places like Montreal is a brutal shock.
- deleted 4y ago[deleted]