Concrete building blocks

I need a base for some large log stores. One solution is to place them on 440x220x100 concrete building blocks. This could be achieved fairly quickly, and allows for straightforward relocation at a later date.

The site is disturbed ground - so this may not provide uniform support and I can expect some settlement. However I can make adjustments at a later date as and when the stores are empty.

Concrete blocks seem to come in 2 main types - dense and medium density. Both types are available for a compression load of 70 N/mm2. The medium density blocks weigh about 14.5kg as opposed to 18 kg for the dense blocks but cost approximately 10% more.

I am willing to pay the extra premium on the medium density blocks in return for the easier handling. But will the medium density blocks be more fragile and liable to break in my application where the variable nature of the ground support may give rise to shear stresses across the blocks?

Any comments appreciated.

Andrew

Reply to
Andrew
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Why do you need a concrete block floor for a log store?

Jim K

Reply to
JimK

It is a base for the structure rather than a floor and is to keep the timber bearers off the ground - in the same way as one might do for a garden shed. (I will be placing a damp proof membrane between the timber and the base).

Andrew

Reply to
Andrew

If the bearers are going to be spanning many blocks then if one sinks, the vertical load will just transfer to the next one.

Just how high is this log store going to be? My gut feel is that medium density would be fine.

Reply to
newshound

Because you want to launch a cruise missile from it?

Dunno. I give up. What's the answer?

Reply to
The Natural Philosopher

The logstores are:

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They currently sit on paving, but I want to remove them to another part of the garden whilst they are empty.

Andrew

Reply to
Andrew

Another variable is their material.They come as basically concrete, and basically fly ash. My experience is that the concrete variety last much longer in damp (ie on the ground) conditions, whereas the fly ash ones crumble away with frost damage. Both materials come in different bearing abilities so the 3.5 / 7.0 / 14 Newton loading doesn't necessarily determine their composition. Concrete one have a smoother finish with less pore and are heavy.

Andrew

Reply to
Andrew Mawson

Jeezus. Why didn?t you DIY something as simple as that ?

Reply to
Simon Brown

Blimey. £334.00. Just asking for DIY I'd have thought.

Reply to
Mike Barnes

/They currently sit on paving, but I want to remove them to another part of the garden whilst they are empty./q

Concrete lintels?

Jim K

Reply to
JimK

pallet wood

NT

Reply to
tabbypurr

Surely they would be fine on medium density blocks? Wouldn't use lightweights.

Reply to
newshound

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