Simple question - anyone know how they do it? I am sure that sand can't be simply dredged off the beach and use, it would be covered in salt, no? That wouldn't bode well for use in reinforced concrete - I seem to recall a spate of Turkish beach villas collapsing because of salty sand, or have I mis-remembered that?
Thanks in advance.
That's why its quarried out of the ground instead. It is used as is. well maybe it gets a bit rained on...
That wouldn't bode well for use in reinforced concrete - I seem to
I very much doubt that much, if any, sand for concrete comes from a beach, certainly not directly. There are beds of sand and gravel all over the UK that are quarried and graded. In the West Country the sand tips you see on the moors in mid-Cornwall, waste from the china clay industry, are extensively used. These are washed, to remove the finest stuff, then graded to give very good sharp sand for concrete.
The Natural Philosopher wrote
Pillock
Well, exactly. I always understood soft sand was dug out and sharp was dredged (how else would it have bits of shell in it?). No big deal to wash the salt off presumably.
the understanding in the group that is simply plain WRONG is unbelievable.
I built a house., I ordered in sand, soft, sharp and gravel up to 20mm. All came from the same quarry.
'course, the quarry might just have been being used as a depot...
/The Natural Philosopher
- show quoted text - the understanding in the group that is simply plain WRONG is unbelievable. /q
Amen :-) :-) :-)
Jim K
I saw a tv program about dredging at sea, the ship graded what it picked up by size but there was no other preparation. So it was still a bit salty.
New brickwork effloresces, I assume due to the sea salt in the sand.
I've heard about sea sand causing collapse in Portugal too. I'm guessing our cement meets standards theirs needn't.
NT
"I did X, and it worked out like Y" "Therefore Y is the only way of doing X"
You see a lot of that here.
(In this instance, I have no idea of the specific truth or otherwise of the assertions. But it's worth spotting the pattern of thinking)
J^n
Your .sig is quite amusing in the context.
I don't think they get it from the beach. However I seem to recall they actually wash it and dry it en masse. Brian
Hanson have a site in Kent which takes in sand and shingle from dredgers working off the east coast. The material is sorted, crushed if too big and then washed to remove the silt and salt, sorted for size again then the process recovers the fine sand and adds it back in to the soft sand. I think they handle about 500K tons a year with part time working. It takes about 5hrs to unload 5K tons from the dredger. The total capacity I believe is around 1.2M tons/yr with 24hr working.
though in this case he didnt say that
Precisely. I was refuting the general statement that 'all sharp sand /soft sand comes from X/Y.
Sand and gravel is wot you get from waterborne loads of rock smashing themselves to pieces.
sure they get smashed a bit more on a beach over time, than in a river,. but its not a hard and fast thing.
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