All I can find is on Wikipedia, but I need more than that!I would be really grateful!!Thank you!
You are looking at lime based mortar and concrete (opus siginum to the Romans). I have used ordinary builders lime, dry in bags, and mixed it as you would with cement 5:1, and let it rest for around 24 hours before use. the great thing about lime based mortar is that when it begins to go hard, you can add more water and mix it again without loss of strength as would be the case with O.P.C. It does take a long time to set, weeks if the weather is cold and wet but the resulting mortar is very good for stone and soft brick as it will allow the structure to move and settle, also when frost freezes the water in the wall, it is the lime mortar that is blown out, not the stone or brick.
