Hi - I am going to be mixing a load of concrete (in a mixer I am hapy
to say!) of 4 parts 20mm aggregate, 2 parts sand, 1 part cement.

I am getting a 1 cubic metre sack of 20mm aggregate delivered and
wonder if anyone would care to suggest how many bags of sand and cement
will be needed for the proportions above, please, assuming standard
25kg bags of cement and similar physically sized bags of sand as you
would buy in Wickes etc - the =A31.00 type.

Many thanks,

Peter

On 24 Apr 2005 08:44:54 -0700, wrote:

Hi - I am going to be mixing a load of concrete (in a mixer I am hapy
to say!) of 4 parts 20mm aggregate, 2 parts sand, 1 part cement.

I am getting a 1 cubic metre sack of 20mm aggregate delivered and
wonder if anyone would care to suggest how many bags of sand and cement
will be needed for the proportions above, please, assuming standard
25kg bags of cement and similar physically sized bags of sand as you
would buy in Wickes etc - the £1.00 type.

Many thanks,

Peter

First thing, the "Jumbo Bags" are normally 900-950 KG, and somewhat
short of 1 Cubic Meter. My little blue book has stone chippings at
1760 KG per Metre Cubed.

Assume a 1:2:3 Mix

Then you need 600 KG of Sand and 300 KG of cement. I'd get a jumbo bag
of sand at the same time.

Alternativly get a "concrete mix" aka "ballast", and mix at 5/6 to 1
cement. To help mixing, 2 rounded shovels = 1 bucket, 1 buckets = 1
bag of cement. I mix 1/2 a bag of cement at a time in my mixer, you
can do a bag at a time but its no quicker in the long run.

Rick

On Sun, 24 Apr 2005 17:01:04 GMT, Rick wrote:

On 24 Apr 2005 08:44:54 -0700, wrote:

Hi - I am going to be mixing a load of concrete (in a mixer I am hapy
to say!) of 4 parts 20mm aggregate, 2 parts sand, 1 part cement.

I am getting a 1 cubic metre sack of 20mm aggregate delivered and
wonder if anyone would care to suggest how many bags of sand and cement
will be needed for the proportions above, please, assuming standard
25kg bags of cement and similar physically sized bags of sand as you
would buy in Wickes etc - the £1.00 type.

Many thanks,

Peter

First thing, the "Jumbo Bags" are normally 900-950 KG, and somewhat
short of 1 Cubic Meter. My little blue book has stone chippings at
1760 KG per Metre Cubed.

Assume a 1:2:3 Mix

Then you need 600 KG of Sand and 300 KG of cement. I'd get a jumbo bag
of sand at the same time.

Alternativly get a "concrete mix" aka "ballast", and mix at 5/6 to 1
cement. To help mixing, 2 rounded shovels = 1 bucket, 1 buckets = 1
bag of cement. I mix 1/2 a bag of cement at a time in my mixer, you
can do a bag at a time but its no quicker in the long run.

Rick

whoops 2 buckes = 1 bag cement

wrote:

Hi - I am going to be mixing a load of concrete (in a mixer I am hapy
to say!) of 4 parts 20mm aggregate, 2 parts sand, 1 part cement.

I am getting a 1 cubic metre sack of 20mm aggregate delivered and
wonder if anyone would care to suggest how many bags of sand and cement
will be needed for the proportions above, please, assuming standard
25kg bags of cement and similar physically sized bags of sand as you
would buy in Wickes etc - the £1.00 type.

Can't get 50kg bags. Haelth and safety

I was running at about 5 bags to a rough ton of sand for a 5:1 sand
cement mix. So my guess is that a cubic metere is ariond 2 tinnes, so
ten bags.s mire or less.

But don't panic. Cement firsts in the boot of the car if you run out,
and it goes hard after a few weeks in the garage anyway, so buy it a
little at a time.

My guess is you will need half a bag of cement per mixer load, 4 shovels
of sand and fill it up with gravel...prolly 15-18 shovels.



Many thanks,

Peter