There are three strength grades for natural hydraulic lime, laid down in the European Norm EN459; NHL2, NHL3.5 and NHL5.
22.
The curing time of lime plaster can be shortened by using ( natural ) hydraulic lime or adding artificially hydraulic lime.
23.
The curing time of lime plaster can be shortened by using ( natural ) hydraulic lime or adding artificially hydraulic lime.
24.
By the 1700s, they included an aggregate of small pebbles and a substance called hydraulic lime, which hardened when water was added.
25.
Non-hydraulic lime takes longer to set and is weaker than hydraulic lime, and should not be allowed to freeze before it is well set.
26.
Non-hydraulic lime takes longer to set and is weaker than hydraulic lime, and should not be allowed to freeze before it is well set.
27.
Restoration works included the strengthening of the roof, the replacement of old cement with hydraulic lime, and installing new paving for the chapel and its parvis.
28.
Pure lime sets very slowly through contact with carbon dioxide in the air and moisture; it is not a hydraulic lime so it will not set under water.
29.
This lime is similar to hydraulic lime but has less soluble silica ( usually minimum 6 % ) and aluminates, and will set under water but will never harden.
30.
The terminology for hydraulic lime mortars was improved by the skilled French civil engineer Louis Vicat in the 1830s from the older system of water limes and feebly, moderately and eminently.
