Concrete
Concrete
(OP)
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Concrete
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.
RE: Concrete
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
RE: Concrete
http://www.ugent.be/ea/structural-engineering/en/research/magnel/research/research3/selfhealing
RE: Concrete
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.