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Posted by Ralph Mowery on July 8, 2009, 12:35 am
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> I'm a newbie to pouring larger quantities of concrete/mortar/cement. I
> have
> a batch I'll need to mix of 3 100 lb bags white portland cement and 5 100
> lb
> bags of tiny pebbles. What is the smallest size mixer I can rent that will
> do this batch all at once? The local rental has 6 cu ft and 9 cu ft
> tow-behind mixers. How much water should I add initially? I am afraid of
> accidentally adding too much water or if I'm too cautious and add it too
> slowly maybe it would take away a bit from my troweling working time. How
> long to leave it spinning round the mixer?
>>No sand?, save money and have it delivered mixed.
That is way less than one yard of concrete. Unless you know someone that
will bring out some leftover mix, you will pay for several yards to get any
ammount delivered. I think around here it used to be a charge of around 3
to 4 yards or they added around the cost of an extra yard for delivery of a
small load.
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Posted by Jim Elbrecht on July 8, 2009, 8:25 am
show/hide quoted text
>> I'm a newbie to pouring larger quantities of concrete/mortar/cement. I
>> have
>> a batch I'll need to mix of 3 100 lb bags white portland cement and 5 100
>> lb
>> bags of tiny pebbles. What is the smallest size mixer I can rent that will
>> do this batch all at once? The local rental has 6 cu ft and 9 cu ft
>> tow-behind mixers. How much water should I add initially? I am afraid of
>> accidentally adding too much water or if I'm too cautious and add it too
>> slowly maybe it would take away a bit from my troweling working time. How
>> long to leave it spinning round the mixer?
>>>No sand?, save money and have it delivered mixed.
>That is way less than one yard of concrete. Unless you know someone that
>will bring out some leftover mix, you will pay for several yards to get any
>ammount delivered. I think around here it used to be a charge of around 3
>to 4 yards or they added around the cost of an extra yard for delivery of a
>small load.
Probably too late for the OP- but there are lots of places who
specialize in short loads these days. Less than a yard will cost
about what 2-3yards ought to cost--- but may still be less than
portland/aggregate/sand and renting a humongous mixer.
And it is infinitely easier and more reliable. Once it is poured,
all you need to do is take care of the mix- not clean up the rental
equipment and return it.
Jim
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Posted by HeyBub on July 7, 2009, 9:38 pm
scorpionleather wrote:
show/hide quoted text
> I'm a newbie to pouring larger quantities of concrete/mortar/cement. I
> have a batch I'll need to mix of 3 100 lb bags white portland
> cement and 5 100 lb bags of tiny pebbles. What is the smallest size
> mixer I can rent that will do this batch all at once? The local
> rental has 6 cu ft and 9 cu ft tow-behind mixers. How much water
> should I add initially? I am afraid of accidentally adding too much
> water or if I'm too cautious and add it too slowly maybe it would
> take away a bit from my troweling working time. How long to leave it
> spinning round the mixer?
I have no idea how long your mixture will take to cure, but it's sure gonna
solidify long before you can trowel a 900+ pounds of cement.
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Posted by scorpionleather on July 7, 2009, 10:24 pm
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> I have no idea how long your mixture will take to cure, but it's sure
> gonna solidify long before you can trowel a 900+ pounds of cement.
If I can figure out how many cubic feet these materials will produce, maybe
I can mix only half of it or less and end up with extra bags. They wanted
to sell me more than enough for the project in their "1 batch" quantity
("you'll end up with extra") but didn't tell me how much extra. So if there
is some way I can convert these bags of cement + sand pebble + water to
cubic feet any tips on this calculation would be much appreciated.
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Posted by HeyBub on July 8, 2009, 12:03 pm
scorpionleather wrote:
show/hide quoted text
>> I have no idea how long your mixture will take to cure, but it's sure
>> gonna solidify long before you can trowel a 900+ pounds of cement.
> If I can figure out how many cubic feet these materials will produce,
> maybe I can mix only half of it or less and end up with extra bags. They
> wanted to sell me more than enough for the project in their "1
> batch" quantity ("you'll end up with extra") but didn't tell me how
> much extra. So if there is some way I can convert these bags of
> cement + sand pebble + water to cubic feet any tips on this
> calculation would be much appreciated.
We can do some back-of-the-envelope calculations. Cement (according to
Google references) is about 5,300 lbs/cu yd, or 200 lbs/cu ft. You've got
900 pounds of stuff, plus water, call it 1000 pounds.
That's five cubic feet of cement.
Still, I'd check the set-up time for the concoction (maybe it's on the bag).
I don't think I could slather five cubic feet of cement before it became
unworkable.
Maybe you could start with a small batch and see how it goes?
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> have
> a batch I'll need to mix of 3 100 lb bags white portland cement and 5 100
> lb
> bags of tiny pebbles. What is the smallest size mixer I can rent that will
> do this batch all at once? The local rental has 6 cu ft and 9 cu ft
> tow-behind mixers. How much water should I add initially? I am afraid of
> accidentally adding too much water or if I'm too cautious and add it too
> slowly maybe it would take away a bit from my troweling working time. How
> long to leave it spinning round the mixer?
>>No sand?, save money and have it delivered mixed.