How to make lime mortar and plaster with hot mix (or dry slaking) / Mortier de chaux mélangé à chaud
Channel: sof2300
Date: 2013-05-22

In the video above, we show how we use hot mix (or dry slaking) method to make lime mortar in our Permaground RasJebal Farm, to build the stone stemwall of our cob house, following these steps :
1 / We place 1 volume of non-hydraulic crafty quicklime stones within a circle of 3 volumes of damp coarse sand.
2 / We add 1 volume of water in the center.
3 / We draw the sand rapidly over the quicklime. The heat produced by slaking drives off some of the moisture from the sand in the form of steam.
4 / We leave it slake for at least 45 minutes. As the quicklime slakes, it expands, forming ﬁssures in the sand.
5 / The result is a dry powdered lime and dried sand. We mix the lime with the sand.
6 / To have a texture of mortar (and to store it), we add 3/4 volume of water, and we mix it again.
7 / We finally crush (or beat) the mix to expel air from the mix, and we use it right away or we pile it and cover it for storage.

Visit our farm blog http://permaground.wordpress.com & facebook page https://www.facebook.com/PermagroundRasJebel