Can you ! Work this out !

[Diamond Pool Finishers]

Then ? how many bags of cement 25kgs as a 3-1 mix would it take to a 1cubic meter bag of sand then ?:mad2: i'am struggling with this one :sofahide: any boffs -out there

 

[Dougs Third Go]

a cubic metre of sand is probs about 1500kg, so it'll be about 20 bags Dave

 

[Alan M]

there are 4 shovels of cament in a bag .so one shovel is 6.5 kg
sand weighs about 1600kg per cu meter
1600 devided by 6.5=246 shovels in a cu meter of sand
at 3 to 1 . 246 devided by 3 = 82 shovels of cement. devided by 4 for a bag = 20.5 bags

 

[DHTiling]

You need to know what weight the sand is..? A cubic mtr is simply an area of volume.. not weight..

 

[Dougs Third Go]

there are 4 shovels of cament in a bag .so one shovel is 6.5 kg
sand weighs about 1600kg per cu meter
1600 devided by 6.5=246 shovels in a cu meter of sand
at 3 to 1 . 246 devided by 3 = 82 shovels of cement. devided by 4 for a bag = 20.5 bags

I wasn't far out then:lol:

 

[Diamond Pool Finishers]

Good lads clever stuff but , sand changes weight by how much moisture is in it , don't it ?

 

[Time's Ran Out]

Concensus so far is 20 bags - but the ready mixed concrete sites have built in formula programmes to work it out.

 

[Diamond Pool Finishers]

Concensus so far is 20 bags - but the ready mixed concrete sites have built in formula programmes to work it out.

yes john but they are only at 4-1 ratio ,we tried that , i think 20-21 bags is close enough TBH thanks guys

 

[Alan M]

not bad for a guesss:30:

 

[DHTiling]

dave,,, mix 3-1 from the bag and when you run out... buy more :lol:

 

[Alan M]

yes you do need to know the weight.the volume doesnt really solve the problem in this case
dry sand usually weighs 1400kg /cu m loose and 1600 packed
wet sand 1900 kg/cu m and 2100 packed

those bags are fairly free draining so the sand wont be that wet.

 

[Ajax123]

1m3 of 1:3 factory mixed mortar will contain in the region of 450kg of op cement. Based on 25kg per bag that is 18 bags. Allowing for wastage overdosing etc your 20bags should be not too far off the mark.

dont use multiverse type cement that has an air entrainer in it cos this makes awful mortar. FEB plasticiser and retarder makes a much creamier mix.

your other option is to buy it ready mixed which would not usually be much more expensive and takes all the labour and error out of mixing.

 

[Diamond Pool Finishers]

1m3 of 1:3 factory mixed mortar will contain in the region of 450kg of op cement. Based on 25kg per bag that is 18 bags. Allowing for wastage overdosing etc your 20bags should be not too far off the mark.

dont use multiverse type cement that has an air entrainer in it cos this makes awful mortar. FEB plasticiser and retarder makes a much creamier mix.

your other option is to buy it ready mixed which would not usually be much more expensive and takes all the labour and error out of mixing.

I must admit mate when i mix my own render/screed i only ever use OPC and i add my own additives , i see young-uns all the time with bags of cement with pre-mixed additives Then addig more of there own without thinking about overdosing the mix ,and additives working agains each other ,....... i see it all the time !!

 

[Ajax123]

I must admit mate when i mix my own render/screed i only ever use OPC and i add my own additives , i see young-uns all the time with bags of cement with pre-mixed additives Then addig more of there own without thinking about overdosing the mix ,and additives working agains each other ,....... i see it all the time !!

That's why most of the house bashers use trowel ready mortars these days. The numpty factor is removed. I must admit I have always mixed my own as well but I used to sell trowel ready. It's generally good stuff provided it is from a quality supplier.

i did have a go with castle cements multicrete cement once. It was horrible stuff. Completely Lifeless and it bled like mad. It depends on the sand as to how goodies. At least if you use your own additives you can adjust things to fit..

 

[Diamond Pool Finishers]

That's why most of the house bashers use trowel ready mortars these days. The numpty factor is removed. I must admit I have always mixed my own as well but I used to sell trowel ready. It's generally good stuff provided it is from a quality supplier.

i did have a go with castle cements multicrete cement once. It was horrible stuff. Completely Lifeless and it bled like mad. It depends on the sand as to how goodies. At least if you use your own additives you can adjust things to fit..

Yep old school here , i select and check sand, and control my own additives then i know what i'am working with has been used for years, but i have also kept -up to speed with new developments ! and quite often used pre-baged modified renders , and as you say no mixing elements so keeps the numpty factor out of it LOL .....

 

[SJPurdy]

According to my readers digest basic guide, 3 parts coarse sand to 1 part cement table then 1 cubic m of sand requires (to the next bag up) 8 x 50 kg. bags of cement.

but if you are buying sand in the big bags which are supposed to be 1 tonne in weight then you will find the volume of sand is (roughly 0.8 x 0.8 x 0.8) only about 0.5 cubic meters

 

[Ajax123]

According to my readers digest basic guide, 3 parts coarse sand to 1 part cement table then 1 cubic m of sand requires (to the next bag up) 8 x 50 kg. bags of cement.

but if you are buying sand in the big bags which are supposed to be 1 tonne in weight then you will find the volume of sand is (roughly 0.8 x 0.8 x 0.8) only about 0.5 cubic meters

Coarse sand for mortar... Yuk! I like my mortar soft and creamy personally.... How can mortar sound that pervy??

 

[hotrod]

500kg

 

[Spud]

a cubic m bag of sand weighs a tonne doesnt it ? thats 1000kg so i make it 333kgs of cement so 14 bags rounded up unless i am wrong on the weight of a one tonne bag of sand

 

[Ajax123]

a cubic m bag of sand weighs a tonne doesnt it ? thats 1000kg so i make it 333kgs of cement so 14 bags rounded up unless i am wrong on the weight of a one tonne bag of sand

No mate. A cubic meter is soft sand weighs in at around 1.5 tonnes.

 

[Spud]

No mate. A cubic meter is soft sand weighs in at around 1.5 tonnes.

Thanks Alan i always buy the one tonne nylon bags of sharp sand from wickes I guess these must be smaller than the cubic metre

 

[White Room]

A cubic m3 weighs approx 1600kg, most bags of sand come in about .800 m3....real hit and miss at times.

 

[Diggy]

Well if you go by what they used in the 80's to build Bradley Stoke in Bristol , then 1 bag of cement should do you.


Diggy