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Concrete
- Thread starter dik
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Dik:
You seem to always be the one pointing us to news we should read!
This is interesting, & great if it works, but it's a biological response to what lime mortars have always done. The lime is dissolved and redeposited in small cracks continuously, which is why old masonry walls deflect and heal (within reason), much to the astonishment of the uninitiated.
You seem to always be the one pointing us to news we should read!
This is interesting, & great if it works, but it's a biological response to what lime mortars have always done. The lime is dissolved and redeposited in small cracks continuously, which is why old masonry walls deflect and heal (within reason), much to the astonishment of the uninitiated.
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shobroco... the guys at the office have the same problem with me...
Regarding mortars, some of the old mortars lacked hydraulic properties and rather than them being self healing, over the decades, the mortar has leached out leaving sand... many of the old mortars had a high degree of 'plasticity' which gave rise to the phenomena you noted...
Dik
Regarding mortars, some of the old mortars lacked hydraulic properties and rather than them being self healing, over the decades, the mortar has leached out leaving sand... many of the old mortars had a high degree of 'plasticity' which gave rise to the phenomena you noted...
Dik
Simfinite engineering
Bioengineer
My uni also focusses on self-healing concrete. Here's a link with nicer pictures 
[URL unfurl="true"]http://www.ugent.be/ea/structural-engineering/en/research/magnel/research/research3/selfhealing[/url]
[URL unfurl="true"]http://www.ugent.be/ea/structural-engineering/en/research/magnel/research/research3/selfhealing[/url]
Okay, sdebock, all interesting, but a question on the SAP: how can you put them in plastic concrete & not have them absorb to their capacity long before the concrete even sets, never mind cracks?
Dik: Somehow, I knew they looked at you that way in the office Yes, I've seen plenty of supposed mortar that was just sand, & I'll bet a lot of it wasn't much more than sand when it started out. Mortars in bad exposures though do definitely eventually migrate almost completely away.
Dik: Somehow, I knew they looked at you that way in the office
Yes, I've seen plenty of supposed mortar that was just sand, & I'll bet a lot of it wasn't much more than sand when it started out. Mortars in bad exposures though do definitely eventually migrate almost completely away.- Status
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