Awl--

In the previous concrete threads, it was pointed out that delivered concrete
is a significantly higher quality than concrete in sacks.
It was also pointed out that adding a little extra portland would help.

A local around here, who does home improvement, along w/ his family, said
that they all agree that Sakrete in particular is crappy mix, and to buy
another brand--altho he forgot the name offhand, but knew the place that
carried it.

Any opinions on this?
If true, might the Sakrete just need extra portland, as well?
--
Mr. P.V.'d
formerly Droll Troll

Proctologically Violated©® wrote:
Awl--

In the previous concrete threads, it was pointed out that delivered concrete
is a significantly higher quality than concrete in sacks.
It was also pointed out that adding a little extra portland would help.

A local around here, who does home improvement, along w/ his family, said
that they all agree that Sakrete in particular is crappy mix, and to buy
another brand--altho he forgot the name offhand, but knew the place that
carried it.

Any opinions on this?
If true, might the Sakrete just need extra portland, as well?
--
Mr. P.V.'d
formerly Droll Troll


I would say it depends on what you are using it for and how much you
need. If you are just setting a couple of posts then use whatever brand
the most convenient store carries. If for a slab of any decent size get
it delivered and forget the bags.

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HD has a bagged ready-mix w/ "5,000" emblazened on the bag. I think it's
sakrete, not sure.

As far as adding portland, I was just citing what others described in the
previous cement threads. Ostensibly made the 'crete stronger, in their
opinion.
--
Mr. P.V.'d
formerly Droll Troll
wrote in message
...
On 5 May 2006 19:59:19 +0200, No wrote:

Proctologically Violated©® wrote:
Awl--

In the previous concrete threads, it was pointed out that delivered
concrete
is a significantly higher quality than concrete in sacks.
It was also pointed out that adding a little extra portland would help.

A local around here, who does home improvement, along w/ his family,
said
that they all agree that Sakrete in particular is crappy mix, and to buy
another brand--altho he forgot the name offhand, but knew the place that
carried it.

Any opinions on this?
If true, might the Sakrete just need extra portland, as well?
--
Mr. P.V.'d
formerly Droll Troll


I would say it depends on what you are using it for and how much you
need. If you are just setting a couple of posts then use whatever brand
the most convenient store carries. If for a slab of any decent size get
it delivered and forget the bags.

Inviato da X-Privat.Org - Registrazione gratuita
http://www.x-privat.org/join.php


Why do you think you need extra portland in bag mix? The last time I
looked up sacrete it was 3000 PSI gravel mix, the high strength is
3500 PSI. Bonsal is similar
Since you can order 2500 PSI transit mix I think this is an unfounded
generalization. There are economic considerations with anything over
about a yard where the truck ends up being cheaper but don't make the
decision based on a perceived weakness in sacrete

wrote:
On 5 May 2006 19:59:19 +0200, No wrote:

Proctologically Violated©® wrote:
Awl--

In the previous concrete threads, it was pointed out that delivered concrete
is a significantly higher quality than concrete in sacks.
It was also pointed out that adding a little extra portland would help.

A local around here, who does home improvement, along w/ his family, said
that they all agree that Sakrete in particular is crappy mix, and to buy
another brand--altho he forgot the name offhand, but knew the place that
carried it.

Any opinions on this?
If true, might the Sakrete just need extra portland, as well?



I would say it depends on what you are using it for and how much you
need. If you are just setting a couple of posts then use whatever brand
the most convenient store carries. If for a slab of any decent size get
it delivered and forget the bags.




Why do you think you need extra portland in bag mix? The last time I
looked up sacrete it was 3000 PSI gravel mix, the high strength is
3500 PSI. Bonsal is similar

What is the compressive strength of tightly packed sand and
gravel without any cement at all?

Compressive strength isn't the whole issue. If you are starting
with 'fencepost and sidewalk mix', then IMHE, mixing more
cement in will greatly improve the surface finish you can get,
and also improve resistance to spalling and bending strength
which helps to resist cracking.

I base this on observing the crumbly nature of plain sakrete.

Agreed as to delivery for large jobs.

--

FF

What is the compressive strength of tightly packed sand and
gravel without any cement at all?

Change the PSI to PSF, and you'll be at about the
right order of magnitude.

Proctologically Violated©® writes:

Any opinions on this?

The bagged products are subject to numerous user errors.

The delivered product is almost certainly mixed by someone who knows what
is going on.

I suspect the reputation of bagged mixes has to do with Mr Mixer, not the
mix.

You know, you can run a lot of tests on your concrete work yourself.
Google "Gillmore tester", "slump test", and the like. Take juice-can
samples and test them in your shop press for compression.

Richard J Kinch wrote:
Proctologically Violated©® writes:

Any opinions on this?

The bagged products are subject to numerous user errors.

The delivered product is almost certainly mixed by someone who knows what
is going on.

And is mixed in a truck designed for just that purpose, not in a wheel
barrow using a shovel and a hoe. The driver needs to add the right
amount of water and mix for the necessary period of time.

Maybe (I dunno one way or the other) a mix richer in cement is more
forgiving to those errors.


I suspect the reputation of bagged mixes has to do with Mr Mixer, not the
mix.

Especially if you consider that fence posts are often set by pouring
the mix in dry and then soaking it.

--

FF

sakrete appears to do a good job, as long as its allowed to cure
propperly and finished ok.

not like a buddy who laid his in the sun on a 90 degree day, never
moistened the surface just rotted off

a bit OT, but....anyone mixing sacrete should know this trick; get a
sheet of poly or a tarp or something similar. 8x8 is a good size.
dump a bag of sacrete in the center, hold up the corners and add water.
then with two people, each holding opposite corners, mix by
alternately lifting opposite corners. you can mix a batch in a blink
of an eye, and it's more thoroughly mixed too. works best with two
people, but i did it myself once by lining a big rubbermaid container
with poly and mixing it on that by alternately lifting corners. a
slick trick.