MOT type 1?
Olav Marjasoo
I've had it quoted to me as a sub-base below concrete garage floor,
and 20mm Gravel/Shingle.
I looked at your site, and got an explanation of another alternative
"scalpings".
--
Olav Marjasoo
Overlooking the Clyde, West Coast of Scotland
Rob
I'm certain Cormaic knows a lot more about this than me, but I've had a
few loads
of both in the last year.
Type 1 is crushed stone of varying sizes. I think about 20mm to what
amounts to dust.
You pop it on your road and roll it in and it acts as a sub base for
whatever surface you're
going to use. I've got concrete on mine where it's on a slope and it's
left exposed where it's
on the flat and it hasn't really rutted or settled over the last year,
although it only gets
cars and small to medium sized tractors on it, plus a couple of oil
tankers a year.
Scalpings are bits of tarmac that have been ripped up when they've been
resurfacing the M4
(or whatever road near you). You roll them on top of a base and they
seem to bond themselves
quite nicely together, especially on a hot day. Only used one road, and
they weren't so good
on a slope which is where I really wanted them. Concrete cost more but
with my limited
knowledge of application techniques did a better job for where I wanted
it.
cormaic
Marjasoo) enriched all our lives with these words......:
>Cormaic, if you're passing by ..what is MOT type 1?
Now known as DTp1 - MOT was Ministry of Transport; DTp is
Department of Transport.
Eeeh - how would we ever manage without civil servants? ;~)
--
cormaic Paving and Drainage Web Site
Culcheth http://www.pavingexpert.com/
Peoples' Republic of South Lancashire
cormaic CAN BE FOUND AT borlochshall.co.uk
cormaic
enriched all our lives with these words......:
>Type 1 is crushed stone of varying sizes. I think about 20mm to what
>amounts to dust.
37.5mm to almost dust. There's a fairly strict 'grading
envelope' that dictates the min/max grain sizes and their relative
amounts in a DTp1.
>Scalpings are bits of tarmac that have been ripped up when they've been
>resurfacing the M4
Not quite - those are Planings. Scalpings are rock waste,
traditionally the waste generated by dressing stone for use in the
construction industry but, in some parts of the country, the term has
come to mean almost any crushed rock/aggregate.
>(or whatever road near you). You roll them on top of a base and they
>seem to bond themselves
>quite nicely together, especially on a hot day.
....but can turn to a right mushy slop in the wet. :~((
All these terms, and more, are defined in more detail on the
Aggregates page of my website.
Bob Builder
Type 1 is a very safe specification almost anywhere hardcore is used. So I
don't knock what you have put in your website. But would you agree that
there are many other hardcores entirely suitable for 'domestic' work that
cost only a fraction of Type 1?
cheers
Bob
"cormaic" <uk...@SODOFFSPAMcormaic.co.uk> wrote in message
news:u31vfu8mk6qo7tous...@4ax.com...
cormaic
<Nospambett...@Yahoo.co.uk> enriched all our lives with these
words......:
>Cormaic,
>
>Type 1 is a very safe specification almost anywhere hardcore is used. So I
>don't knock what you have put in your website. But would you agree that
>there are many other hardcores entirely suitable for 'domestic' work that
>cost only a fraction of Type 1?
>
Depends on how you define 'a fraction'. You might be able to
save as much as a couple of quid per tonne by using a secondary
aggregate (ie, recycled rather than freshly quarried), but then it
comes down to what's available in your area.
Here in the aggregate rich north, I'm only paying 1.20 quid
per tonne more for a DTp1 limestone than I would for a SF2 (selected
fill) of crushed brick/concrete. I know from experience that DTp1
limestone is just about the finest sub-base material on the planet,
and I also know from experience that, while some SF2 might be fine and
dandy for a residential driveway, some loads we've brought in have
been all dust or have turned to slop when wet.
If I was constructing a residential driveway and I knew the
sub-grade was highly reliable (let's say a CBR of 5% or more) then I
might be persuaded to use a different sub-base material, but, for
civic and commercial works, I would *always* use and specify a DTp1.
Look at it this way - on a typical residential driveway, DTp1
is costing me about 24p per square metre more than a 2ndry agg - for a
typical 30m2 driveway, that's a whopping 7.20 quid. :~)
Steve Taylor
> I know from experience that DTp1
> limestone is just about the finest sub-base material on the planet,
Hi Cormaic,
You always talk of DTp1 as a SUB-base. If I want to use it for a low-ish
traffic site access track, should I dress it with something else or will
it be OK left as-compacted ?
Thanks
Steve
Bob Builder
availability. Most projects I have worked on have been in the Eastern half
of the midlands. The savings against using type one would be in the order of
at least 30% for the material element.
SF2 is in reality a tad variable! - One for the people here to stay away
from. Our company did use a lot of good quality SF2 on a major project for a
new Building Society HQ by bringing onto site crushing plant for the
demolished old hospital buildings. Thereby qualifying the project for BREAM
points. But, in small loads SF2 may appear all lumps or all fines!
For domestic projects I have found that a local landscaping contractor gets
a type of quarry waste that in my opinion is top notch! - A heck of a lot
cheaper than buying say a part load of Type 1! - (Most of the quarry waste
around my home is Granite).
The point is, it's worth checking out what is available and what the savings
are. As for your patch, I couldn't agree more! - If the savings for
alternatives are not significant then use the best!
cheers
Bob
"cormaic" <uk...@SODOFFSPAMcormaic.co.uk> wrote in message
news:9de6gu0kpejdlfndm...@4ax.com...
Bob Builder
As a temporary road you should not need to dress Type 1. In the Midlands
where I am, we would never use a type 1 for this purpose - (Throwing money
away on a quality material for temp use!). On the other hand on in Cormaic's
area the balance on cost will not be so heavily tilted!
One point worth mentioning is that depending on what you put the hardcore
on, it may be economically viable to use a terram or similar before putting
down the hardcore. I have never seen a temporary road using a decent quality
stone dressed with anything. In fact on one project we used a quarry waste
first - It had a hell of a lot of big lumps in it - and then we dressed it
with a Type 2 stone so you could drive over it!.
cheers
Bob
"Steve Taylor" <st...@thetaylorfamily.org.uk> wrote in message
news:3D0350D1...@thetaylorfamily.org.uk...
Steve
> Steve,
>
> As a temporary road you should not need to dress Type 1. In the Midlands
> where I am, we would never use a type 1 for this purpose - (Throwing
money
> away on a quality material for temp use!). On the other hand on in
Cormaic's
> area the balance on cost will not be so heavily tilted!
>
> One point worth mentioning is that depending on what you put the hardcore
> on, it may be economically viable to use a terram or similar before
putting
> down the hardcore. I have never seen a temporary road using a decent
quality
> stone dressed with anything. In fact on one project we used a quarry
waste
> first - It had a hell of a lot of big lumps in it - and then we
dressed it
> with a Type 2 stone so you could drive over it!.
Thanks Bob,
We were planning on Terram 1000 underneath it all. The deep substrate is
shales, with an occasional thin band of clay about 6-8" down. We weren't
going to bother with much drainage beneath it. WIth the clay bands,
should we do something ? This isn't going to be temporary, just not
often trafficed (three times a week maybe)
Steve
Rob
I've got all the flattish bits of my mile long drive just covered with
Type 1.
It's been there for 2 years (which I know isn't long) but hasn't
degraded noticeably.
It pot holed in a few places within a couple of months of going down,
but I just filled
those and they haven't reappeared. Gets 2 heavy cars over it twice a day
plus
occasional tractors, gas and oil delivery trucks. I haven't compacted it
other than driving
over it. Is on slopes of around (at a guess) 7 or 8%, anything steeper,
unfortunately a lot
of it, I am concreting as and when funds allow. In terms of cost I am
sufficiently far away
from a quarry or materials recycler to make delivery the bulk of what I
pay so Type 1 works
out about 50 pence a ton more expensive than crushed concrete.
Olav Marjasoo
<uk...@SODOFFSPAMcormaic.co.uk> wrote:
>Twas Wed, 05 Jun 2002 17:52:29 GMT, when ol...@kodu.u-net.com (Olav
>Marjasoo) enriched all our lives with these words......:
>
>>Cormaic, if you're passing by ..what is MOT type 1?
>
> Now known as DTp1 - MOT was Ministry of Transport; DTp is
>Department of Transport.
> Eeeh - how would we ever manage without civil servants? ;~)
>
thanks for reply and others. delay due to JCB cutting BT line. Just
got working 30 mins ago
The Natural Philosopher
Olav Marjasoo wrote:
> thanks for reply and others. delay due to JCB cutting BT line. Just
> got working 30 mins ago
> --
:-)
Nice one.
Olav Marjasoo
wrote:
and there's more...
JCB left when weather worsened, wheels spinning, leaving me with 10-20
tons of wet slurry/mud at bottom of drive.
"We'll be back when rain stops and has been dry for one day" .
Well its been pi**ing it down since.
I'm looking at the weather forecast all the time. And over the Clyde,
westwards, to see the incoming weather.
I do feel sorry for the contractor and his two sons, they have now had
to abandon 4 jobs due to weather.
When they come back, they will scrape away the 10-20 tons and put in a
hard base material on drive. That was NOT the reason for my original
question, I'm having to become a (reluctant) expert on "hardcore".