Volume of a 25kg bag

[senfre_]

Additionally to some good points above, automated bagging machines dispense measures by weight - it's a fast and efficient process, that would allow the same production line to supply materials of different volumes.

However, for arguments sake...

Here's an example of a company supplying in volume:

In this case, an equivalent 15L bag of sharp sand, would weigh somewhere between 24 and 25.5kg.

I can't understand why they wouldn't just print it on the bags. It's a standard bag size and they know the product that's going in it.
Good idea to infer it from the bulk bags. Not exactly precise but a decent way approximate.

Where are you buying the aggregates from?

Screwfix, B&Q, Wickes, usually online so I look at the manufacturer's website for specs

 

[denso13]

I can't understand why they wouldn't just print it on the bags.

Because the volume can change depending on what you are doing with it.

A lot don't even have the weight, just "large bag".

Tarmac Sharp Sand - Major Bag | Wickes.co.uk

Tarmac Sharp Sand - Major Bag

www.wickes.co.uk

 

[senfre_]

Because the volume can change depending on what you are doing with it.

So add the relevant ones..
I don't need to know what volume multifinish is when compacted, but I would do for type 1..

 

[denso13]

So add the relevant ones..

So for sand perhaps, instead of 25kg, it could be 0.0125m³ at a density of 25kg/m³?

 

[senfre_]

So for sand perhaps, instead of 25kg, it could be 0.0125m³ at a density of 25kg/m³?

Obviously that would be a useless figure because you can't measure that on site without specialist equipment
But seeing as sand compacts to (say) 80% after the first pass then doesn't compact much more than that without obviously over compacting, it'd be safe for manufacturer's to list a 'volume when compacted' figure
Or maybe sand varies too much for that figure to be useful, which is kind of the point of this thread - am I missing something?

 

[noseall]

- am I missing something?

Air and water.

 

[RandomGrinch]

25kg/m³?

2000kg/m³?

 

[denso13]

2000kg/m³?

And it was supposed to be easier that way...

 

[denso13]

0.0125m³ at a density of 25kg/m³?

0.0125m³at a density of 20kg/.01m³?

 

[Charlie George]

I can't understand why they wouldn't just print it on the bags. It's a standard bag size and they know the product that's going in it.
Good idea to infer it from the bulk bags. Not exactly precise but a decent way approximate.


Screwfix, B&Q, Wickes, usually online so I look at the manufacturer's website for specs

Wickes, B&Q dont sell in 25kg bags for sand/aggregate etc, and Wickes state the volume each bag contains on their website.

 

[phatboy]

Which volume should they put? As bagged, compacted, once the required amount of water is added, once its set?

It's on the purchaser to dictate the end volume dependant on the intended usage.

Plaster tells you the area it will cover at a given thickness, based on the amount of water being added as instructed. But most other materials have too many variables.