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#1
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Effect of salt on concrete?
During the recent cold spell, I kept a footpath's width along
the driveway clear by copious amounts of cooking salt. Now, although the rest of the concrete has 56 years' of grey drabness and growth (which you could "liken" to a moss) the bit that I kept clear is yellowish and crumbling. I wonder if anyone here has the chemical reaction info, or similar experiences? |
#2
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Effect of salt on concrete?
On Thu, 17 Feb 2011 10:45:41 -0000, "anon and off"
wrote: During the recent cold spell, I kept a footpath's width along the driveway clear by copious amounts of cooking salt. Now, although the rest of the concrete has 56 years' of grey drabness and growth (which you could "liken" to a moss) the bit that I kept clear is yellowish and crumbling. I wonder if anyone here has the chemical reaction info, or similar experiences? Have a look at http://www.ehow.co.uk/how_6382604_re...-concrete.html |
#3
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Effect of salt on concrete?
On Feb 17, 10:45*am, "anon and off" wrote:
During the recent cold spell, I kept a footpath's width along the driveway clear by copious amounts of cooking salt. Now, although the rest of the concrete has 56 years' of grey drabness and growth (which you could "liken" to a moss) the bit that I kept clear is yellowish and crumbling. I wonder if anyone here has the chemical reaction info, or similar experiences? I think you'll find it is all crumbling. You have just exposed it with your salt. A couple of applications is not going to hurt tit. |
#4
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Effect of salt on concrete?
On 18/02/2011 00:36, Janet wrote:
In , says... On Thu, 17 Feb 2011 10:45:41 -0000, "anon and off" wrote: During the recent cold spell, I kept a footpath's width along the driveway clear by copious amounts of cooking salt. Now, although the rest of the concrete has 56 years' of grey drabness and growth (which you could "liken" to a moss) the bit that I kept clear is yellowish and crumbling. same here. I wonder if anyone here has the chemical reaction info, or similar experiences? I had a similar experience, many years ago. Not sure of the explanation, but sea water will attack certain cements, and salt-water-resistant cements are recommended for marine exposure. We're on the coast with plenty of marine exposure, but that never seemed to have any effect on our concrete before. Unusually for here, this winter we needed to scatter road salt (free from local council) on frosty concrete paths and steps. We're certainly seeing the effects :-( lots of erosion and bits breaking off. Very high local concentrations of sodium chloride will drive the reverse reaction to make soluble calcium chloride (and sodium carbonate/silicate) from your concrete. This weakens the surface structure of the concrete and then freeze thaw action makes it worse. It has destroyed the surfaces of high pressure cast paving slabs in a local market town which surprised me (maybe a bad batch). It is only usually a problem if you use a vast excess of finely divided rapidly soluble table salt. Rock salt normally dissolves slowly enough that it doesn't get to really damaging levels before washing away in mel****er. But salt in excess isn't very good for concrete and will attack any minor imperfections or weak lines. I am amazed that any councils are giving away road salt these days. In North Yorkshire they have taken away as many public road salt bins as they think they could get away with! To qualify for a salt bin now you need a blind bend with a 1:6 gradient leading to a busy junction. Regards, Martin Brown |
#5
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Effect of salt on concrete?
"harry" wrote in message ... On Feb 17, 10:45 am, "anon and off" wrote: During the recent cold spell, I kept a footpath's width along the driveway clear by copious amounts of cooking salt. Now, although the rest of the concrete has 56 years' of grey drabness and growth (which you could "liken" to a moss) the bit that I kept clear is yellowish and crumbling. I wonder if anyone here has the chemical reaction info, or similar experiences? I think you'll find it is all crumbling. You have just exposed it with your salt. A couple of applications is not going to hurt tit. I spreasd a small amopunt of typical couincil grit on my paths and the surface has degenerated and is certainly damaged. I can't agree that "a couple of applications is not gpoint to hurt tit ! A strong possibility is that water has been absorbed by the top thin layer of the concrete and has "blown" in being frozen. Bill |
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