[PRCo] Re: Station square

[Fred Schneider]

Steel and concrete also have essentially the szme coefficient of expansion, i.e.
they both expand and contract at approximately the same rate with addition or
subtraction of heat.  That is why steel is used as reinforcing rods in
concrete.  It may also be why steel ties work well in concrete.  Just a
thought.  I did not bother to look it up.

"Edward H. Lybarger" wrote:

> Steel was assumed, but I never really looked.  Steel gives the greatest
> longevity and lowest maintenance.  I suppose you could pour over oak ties to
> some advantage in service life, but am not sure I've ever seen that.  It
> would seem that the wood would flex and break up the concrete.
>
> -----Original Message-----
> From: pittsburgh-railways-bounce at lists.dementia.org
> [mailto:pittsburgh-railways-bounce at lists.dementia.org]On Behalf Of
> Harold G.
> Sent: Saturday, January 01, 2005 2:59 PM
> To: pittsburgh-railways at dementia.org
> Subject: [PRCo] Re: Station square
>
> Ed and others   A question.  did they use wood
> ties or steel spacing bars?
>
> Harold Geissenheimer
> -----Original Message-----
> From: Edward H. Lybarger <trams at adelphia.net>
> To: pittsburgh-railways at dementia.org <pittsburgh-railways at dementia.org>
> Date: Saturday, January 01, 2005 2:39 PM
> Subject: [PRCo] Re: Station square
>
> >I believe the ultimate objective was tie longevity, leading to lower
> >maintenance costs, plus, of course, a very stable riding surface as a
> bonus.
> >
> >-----Original Message-----
> >From: pittsburgh-railways-bounce at lists.dementia.org
> >[mailto:pittsburgh-railways-bounce at lists.dementia.org]On Behalf Of Bill
> >Robb
> >Sent: Saturday, January 01, 2005 2:20 PM
> >To: pittsburgh-railways at dementia.org
> >Subject: [PRCo] Re: Station square
> >
> >
> >Any idea why PRC paved the 42 Dormont PRW to just over
> >the top of the ties, but not flush with the top of the
> >rail?  Concrete is an expensive method of paving.
> >
> >Bill Robb
> >
> >
> >--- "Harold G." <transitmgr2 at earthlink.net> wrote:
> >
> >> Happy New Year to Derrick and all
> >>
> >> I only know about putting asphalt on top of
> >> abandoned
> >> tracks.  Didthey ever put concrete over it?  Penn
> >> Ave
> >> downtown and the others I mentioned had removed the
> >> abandoned rails.
> >>
> >> PRC used concrete on PRW on 42 Dormont with the
> >> rail sticking up a little.  I liked that.
> >>
> >> Harold Geissenheimer
> >> -----Original Message-----
> >> From: Derrick J Brashear <shadow at dementia.org>
> >> To: pittsburgh-railways at dementia.org
> >> <pittsburgh-railways at dementia.org>
> >> Date: Friday, December 31, 2004 10:37 PM
> >> Subject: [PRCo] Re: Station square
> >>
> >>
> >> >On Thu, 30 Dec 2004, Harold G. wrote:
> >> >
> >> >> Greetings to all/
> >> >>
> >> >> Two points.   City of Pgh DPW in the 1960's
> >> >> was sold on concrete paved streets.  See Penn
> >> >> ave downtown, 7trh street, streets around A Ctr
> >> and
> >> >> E Lib mall, etc.  I liked them.  made every thing
> >> >> look clean.  Thats why 2dAve was in coincrete.
> >> >
> >> >Billboards along the PA Turnpike be damned, if you
> >> want it to last, you
> >> >pour concrete, on a proper subbase. (well, if you
> >> want it to *really*
> >> >last, you use properly fired bricks, and lay them
> >> properly, but Grant St
> >> >shows firing is hard, and laying bricks is a lost
> >> art; Besides, things
> >> >aren't as smooth, and people don't like that)
> >> >
> >> >The asphalt over concrete that's been happening a
> >> lot lately is probably
> >> >an ok compromise; Do sleazy deep-patching, then
> >> just roll asphalt over it.
> >> >Asphalt's rutting, binder is gone? Scrape it off
> >> the concrete, recycle it,
> >> >and put it down again.
> >> >
> >> >Of course, the usual paving "machine" (typically
> >> just a movable jig on a
> >> >track put down to make it easy to continuously
> >> pour) would leave cleaning
> >> >to be done if you actually ran it over girder rail;
> >> I'm actually somewhat
> >> >curious how they lay concrete over rail. In the old
> >> days the answer was
> >> >almost certainly "by hand".
> >> >
> >> >
> >> >
> >>
> >>
> >>
> >
> >
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