Seems to be every 25' or so, which then seems to raise at
the cuts, creating a "scallop" effect. Painful to drive on
in a heavy truck.

Thus requiring the the services of the aforementioned
road grinding machine"

The question is: why the "cut" in the first place?

thanks

gary

And the next question.

Several states, incl WY, are having the diamond cutting
machines cutting slots about 2" apart, 12", long across the
aformentioned cuts that span the lanes, Then they
jackhammer out the material between, blow it clean, and
fill with "somehting".

What is the purpose of this process?

thanks

On Tue, 15 Sep 2009 06:18:53 -0600, the infamous
scrawled the following:

Seems to be every 25' or so, which then seems to raise at
the cuts, creating a "scallop" effect. Painful to drive on
in a heavy truck.

Thus requiring the the services of the aforementioned
road grinding machine"

The question is: why the "cut" in the first place?

They're called "expansion joints". When concrete expands in the heat
of the day, those give it some place to go. when it contracts in the
cold, they open up a wee bit. If the surface was all one piece, the
contraction would open up gaps so large that VW Bugs and Chebby Metros
would go missing. Hmm, sounds like a plan...

--
"To compel a man to subsidize with his taxes the propagation of
ideas which he disbelieves and abhors is sinful and tyrannical."
-- Thomas Jefferson

On Sep 15, 12:24*pm, Larry Jaques
wrote:
On Tue, 15 Sep 2009 06:18:53 -0600, the infamous
scrawled the following:

Seems to be every 25' or so, which then seems to raise at
the cuts, creating a "scallop" effect. *Painful to drive on
in a heavy truck.

Thus requiring the the services of the aforementioned
road grinding machine"

The question is: *why the "cut" in the first place?

They're called "expansion joints". *When concrete expands in the heat
of the day, those give it some place to go. *when it contracts in the
cold, they open up a wee bit. *If the surface was all one piece, the
contraction would open up gaps so large that VW Bugs and Chebby Metros
would go missing. *Hmm, sounds like a plan...

--
"To compel a man to subsidize with his taxes the propagation of
ideas which he disbelieves and abhors is sinful and tyrannical."
* * * * * * * * * * * * * * * * * * * * * -- Thomas Jefferson

And, when a heavy truck tire crosses the 'gap' and hits the next slab,
over and over, millions of times, the slab tilts near-end down, far-
end up, making the impact on the slab even greater, accelerating the
process.

I84 near fishkill used to be great for getting a little air from slab-
to-slab in a few spots.


Dave

On Sep 15, 9:45*am, wrote:
And the next question.

Several states, incl WY, are having the diamond cutting
machines cutting slots about 2" apart, 12", long across the
aformentioned cuts that span the lanes, *Then they
jackhammer out the material between, blow it clean, *and
fill with "somehting".

What is the purpose of this process?

thanks

Only times I've seen them cutting out the expansion joints was to fix
craters already present, repair rebar or mesh or add rebar in for
rusted out spots on bridges. They then poured concrete level with the
rest and it was good to go for another few years or until they
asphalted over the road surface. Common summer repair job out on I80
in the wilds of Nebraska. Miles and miles of single lane traffic and
no exits...

Stan

wrote:
On Sep 15, 9:45 am, wrote:
And the next question.

Several states, incl WY, are having the diamond cutting
machines cutting slots about 2" apart, 12", long across the
aformentioned cuts that span the lanes, Then they
jackhammer out the material between, blow it clean, and
fill with "somehting".

What is the purpose of this process?

thanks

Only times I've seen them cutting out the expansion joints was to fix
craters already present, repair rebar or mesh or add rebar in for
rusted out spots on bridges. They then poured concrete level with the
rest and it was good to go for another few years or until they
asphalted over the road surface. Common summer repair job out on I80
in the wilds of Nebraska. Miles and miles of single lane traffic and
no exits...

Stan

They lay in steel dowels-(half the bar is covered with a thin metal
sleeve) then fill with Hi-strength concrete--keeps the two slabs from
moving vertically relative to one another(working) under a passing
load..In other words a Shear joint, that still allows for
expansion/contraction.