DIY Gravel Type Board Mix

[Mark 38]

Like to make N40 strength gravel board mix or retaining wall.

15m length x 300mm high x 75mm thick.

My only 2 options due to site limitations.

Barrow mix with paddle and pour, how many bags of 20kg ballast, how many bags of 25kg cement will I require?

Other option.

Premixed, 20kg bags of N40 grade concrete, barrow mix just adding water, how many bags will I require?

Either option I will be adding 8mm rebar.

 

[noseall]

24 (25kg) bags of ballast and about 6 bags of cement.

 

[Mark 38]

24 (25kg) bags of ballast and about 6 bags of cement.

thanks will that ratio make N40 grade concrete?

If I buy 20kg bags of premixed N40 grade concrete, how many bags should I require?

 

[^woody^]

If you want a smooth face, you'll need to adjust the mix for smaller gravel and more fines.

 

[JohnD]

I wonder what it would cost to get a pump In.

Mix is heavy.

How deep in the ground will your retaining wall be?

 

[noseall]

I wonder what it would cost to get a pump In.

Mix is heavy.

How deep in the ground will your retaining wall be?

A pump?

It's a 1/3rd of a cube. There will be that amount in the pipes and hopper alone. lol.

 

[Mark 38]

If you want a smooth face, you'll need to adjust the mix for smaller gravel and more fines.

It doesn't have to that smooth but what is the bag ratio for my requirements?

 

[Mark 38]

I wonder what it would cost to get a pump In.

Mix is heavy.

How deep in the ground will your retaining wall be?

To small a mix for a pump so it's a manual mix only.

 

[noseall]

It doesn't have to that smooth but what is the bag ratio for my requirements?

30 bags.

 

[Mark 38]

30 bags.

Thanks, with the dimensions I gave, 30 bags of N40 premix at 20kg per bag?

 

[JohnD]

How deep in the ground will your retaining wall be?

?

 

[Mark 38]

?

15m length x 300mm high ( of which 100mm will be in the ground over entire length ), x 75mm thick.

 

[JohnD]

So more a curb than a retaining wall.

 

[Mark 38]

So more a curb than a retaining wall.

A high curb more then anything but needs to be a strong mix.

Locally purchased high concrete gravel boards would have done but not thick enough and only a N20 mix, not strong enough for my needs.

So can either shutter in situ' and make N40 grade concrete or buy bags of N40 premixed concrete, barrow mix with water and pour.

Wickes, my nearest merchant sell 20 kg bags of premixed N40 grade concrete, just add water.

With the dimensions I gave how many bags would I require?

.

 

[noseall]

With the dimensions I gave how many bags would I require?

30 bags.