Page 2 of 2
Posted: Wed Oct 19, 2011 2:05 pm
by Bilabonic
Readymix is not an option as i cannot get a lorry anywhere near the area.
I have 2 mixers and mates helping so should be ok.
So for 1 tonne loose i need 5 bags cement for 5:1 mix ?
Cheers
Posted: Wed Oct 19, 2011 2:43 pm
by Carberry
Bilabonic wrote:Readymix is not an option as i cannot get a lorry anywhere near the area.
I have 2 mixers and mates helping so should be ok.
So for 1 tonne loose i need 5 bags cement for 5:1 mix ?
Cheers
5 bags of cement is 125kg, to 1 tonne of ballast is an 8:1 mix.
For 2 tonne and 5:1 you want 400kg of cement which is 16 bags.
Posted: Wed Oct 19, 2011 3:05 pm
by Bilabonic
Am i correct that 5:1 is correct mix for a base ?
Posted: Wed Oct 19, 2011 4:15 pm
by Colin James
I think the "tonne" in "tonne bag" refers to the volume.
A tonne is 1m3 or 1000kg.
The same way ancient folk talk about a ton being 2240 lbs, (20 hundred weight etc) or 35 ft cubed.
I am good at pub quizzes.
Regards,
colin.
Posted: Wed Oct 19, 2011 7:39 pm
by lutonlagerlout
Colin James wrote:I think the "tonne" in "tonne bag" refers to the volume.
A tonne is 1m3 or 1000kg.
The same way ancient folk talk about a ton being 2240 lbs, (20 hundred weight etc) or 35 ft cubed.
I am good at pub quizzes.
Regards,
colin.
not that good colin 1m3 is not a tonne
only if it is pure water is 1m3 a tonne
LLL
Posted: Wed Oct 19, 2011 7:50 pm
by Bilabonic
So 1m3 of feathers is a tonne....lol
LLL you got me looking at Blenheim blue now for a border :laugh:
Posted: Wed Oct 19, 2011 7:54 pm
by lutonlagerlout
Carberry wrote:Bilabonic wrote:Readymix is not an option as i cannot get a lorry anywhere near the area.
I have 2 mixers and mates helping so should be ok.
So for 1 tonne loose i need 5 bags cement for 5:1 mix ?
Cheers
5 bags of cement is 125kg, to 1 tonne of ballast is an 8:1 mix.
For 2 tonne and 5:1 you want 400kg of cement which is 16 bags.
i always thought that mixes were gauged by volume not weight as obviously ballast will have additional weight in it due to water
if you could kin dry your ballast you might find that a bulk bag only weighs 750kg which with the addition of 5 bags of cement makes 6:1 which is a strong concrete mix
8 bags of cement for a bulk bag is way over the top,that the sort of mix that i would use on a groundbeam
I have knocked up a lot of concrete recently for haunching and a half bag of cement and 12 shovels produces a very strong hard mix
cheers LLL
Posted: Wed Oct 19, 2011 8:02 pm
by Carberry
lutonlagerlout wrote:Carberry wrote:Bilabonic wrote:Readymix is not an option as i cannot get a lorry anywhere near the area.
I have 2 mixers and mates helping so should be ok.
So for 1 tonne loose i need 5 bags cement for 5:1 mix ?
Cheers
5 bags of cement is 125kg, to 1 tonne of ballast is an 8:1 mix.
For 2 tonne and 5:1 you want 400kg of cement which is 16 bags.
i always thought that mixes were gauged by volume not weight as obviously ballast will have additional weight in it due to water
if you could kin dry your ballast you might find that a bulk bag only weighs 750kg which with the addition of 5 bags of cement makes 6:1 which is a strong concrete mix
8 bags of cement for a bulk bag is way over the top,that the sort of mix that i would use on a groundbeam
I have knocked up a lot of concrete recently for haunching and a half bag of cement and 12 shovels produces a very strong hard mix
cheers LLL
Should be mixed by volume, but then you get eejits putting in a massive heaped shovel full of sand and 1/3 of that in cement and calling it equal and people too lazy to fill a bucket then pour it in to the mixer.
Posted: Thu Oct 20, 2011 8:17 am
by Colin James
Not quite.
1m3 of water weights a tonnes, but the word tonne can be either a mass or volume (in some industries).
In the case of the tonne bags, I think the idea is, if you fill it up you get 1 m3, of whatever you put in it.
Ships were taxed on their ability to carry cargo, which measured volume as "tons" in volume as well as weight.
Regards,
Colin
Posted: Thu Oct 20, 2011 12:30 pm
by Brucieboy
Colin, I'm afraid you're talking gobbledegook!! A tonne is measure of mass or weight. A cubic metre is a measure of volume. How can they be the same? Density is mass divided by volume. The density of water is 1 tonne per cubic metre. The density of fully compacted concrete using normal gravel aggregate/sand at S2 slump is typically 2.35 tonnes per cubic metre. If you fill a nominal "one tonne" bulk bag (approx 0.5 cubic metre in volume) with concrete it will weigh about 1.2 tonnes. With water it will weigh 0.5 tonne and sharp sand about 0.9 tonne. If you filled it with lead it would weigh about 5.5 tonnes. I hope this clarifies your thinking.
Posted: Thu Oct 20, 2011 12:46 pm
by Colin James
http://en.wikipedia.org/wiki/Ton_(volum ... _of_volume
The displacement ton is a unit of volume used for calculating the displacement of a ship.[9] While displacement is a measure of a ships weight, being the volume of water displaced multiplied by its density and measured in long tons (tons displacement), the displacement ton is the standard volume of water representing one ton displacement.[10] It equates to 35 cubic feet (0.9911 m3) of sea water at average density, being slightly less than the 224 imperial gallons, of the water ton (qv).[citation needed] It is usually abbreviated as DT.
One measurement ton or freight ton is equal to 40 cubic feet (1.133 m3), but historically it has had several informal definitions.
Don't let us get too excited about this, it is more of a pub quiz question. The above is from Wikipedia because it is easier to cut and paste but it is in plenty of structural text books. Customs and Excise use these definitions a lot at one time although I am not too sure now. I think the tonne in "tonne bags" is really the frieght ton mentioned above.
Regads,
Colin.