tag:blogger.com,1999:blog-1828166865647185633.post9097779582627024060..comments2024-03-29T04:56:21.385+00:00Comments on The Ranty Highwayman: BridgesThe Ranty Highwaymanhttp://www.blogger.com/profile/17361350433158148025noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-1828166865647185633.post-76747258465358869422014-01-31T07:57:49.173+00:002014-01-31T07:57:49.173+00:00You have nicely explained about bridge work and al...You have nicely explained about bridge work and all repairing that is to be done there for making it strong. You have described nice facts which we need to concentrate.Alisa Hillhttp://directconcreteremedials.co.uk/flooring-repairs.phpnoreply@blogger.comtag:blogger.com,1999:blog-1828166865647185633.post-27547161168555070082012-12-17T18:18:20.939+00:002012-12-17T18:18:20.939+00:00Whoops - ion, not iron!Whoops - ion, not iron!The Ranty Highwaymanhttps://www.blogger.com/profile/17361350433158148025noreply@blogger.comtag:blogger.com,1999:blog-1828166865647185633.post-14359900331421936872012-12-17T18:17:58.969+00:002012-12-17T18:17:58.969+00:00Chloride iron exchange? Yes, the swelling of the r...Chloride iron exchange? Yes, the swelling of the reinforcement is a good point. It can create enough force to "blow" pieces of the concrete off (which is a potential danger to road users) and so expose reinforcement direct to the atmosphere.The Ranty Highwaymanhttps://www.blogger.com/profile/17361350433158148025noreply@blogger.comtag:blogger.com,1999:blog-1828166865647185633.post-79709586232155958732012-12-17T15:37:08.342+00:002012-12-17T15:37:08.342+00:00Hi, I am a chemist- the problem with the prestress...Hi, I am a chemist- the problem with the prestressed concrete reinformcement and salt is pretty much as you describe it. The only little bit of detail I'd add that's of any use is that as iron/steel corrodes, it swells, so that not only do you have less strenght in the metal, but it is forcing the already cracked (as the water has got in) concrete apart- making things even worse.Alhttps://www.blogger.com/profile/06817806128052425511noreply@blogger.comtag:blogger.com,1999:blog-1828166865647185633.post-379665561940609582012-12-17T06:07:25.681+00:002012-12-17T06:07:25.681+00:00I think "value engineering" is to blame,...I think "value engineering" is to blame, or as I call it "done on the cheap". Our forebears probably over-designed things, but this is why we are still using Victorian infrastructure!The Ranty Highwaymanhttps://www.blogger.com/profile/17361350433158148025noreply@blogger.comtag:blogger.com,1999:blog-1828166865647185633.post-60537669126073154982012-12-17T02:14:08.169+00:002012-12-17T02:14:08.169+00:00The traditional arch bridge has a lot to recommend...The traditional arch bridge has a lot to recommend it, in the fine 'new world' way of thinking where ever greater technical tricks are used to stretch beyond using designs which are inherently safe.<br /><br />On the rail network, arches which were built when trains had 40 ton locomotives and travelled at less that 50 mph now have 90 ton locomotives thundering over them at over twice that speed, on the roads - including roads abandoned for centuries, arches remain standing - with famed examples like those on Wade's road from Carrbridge to Inverness.<br /><br />We even see it in the roads themselves. New roads built by the brute force of an ability to shift a mountain - then sinking, because unlike the old routes carefully built into the landscape and packed down over centuries, we have challenged nature to build them. Old road builders accepted flooding for a few days, often bot an annual occurrence, but built roads, and even bridges which could sit happily under water for those short periods and then immediately start up in use after the waters receded. Some features were even laid out to perform the function of a flood channel, as a road running 6" deep in water can still be used as a road, but it can clear water which would otherwise be building up to flood homes and businesses.<br /><br />Yes we have much to re-learn , a detail I reflect on as I use the flush setted street near me which still sheds water imperceptably into the self flushing side gullies, even with the lightest shower, still (where the utilities haven't wrecked it) functioning perfectly 160 years after it was laid with a sound tight bond on its puddle clay or cold tar bad, with no maintenance at all to speak of. makes you wonder at the false economy of using so much tarmac on our urban roads. Dave Hhttps://www.blogger.com/profile/11574227829528072780noreply@blogger.com