Why use lime? 
Lime is usually used to make mortars when mixed with an aggregate, and it can also be used to make plaster/renter when mixed with an aggregate and fibre.
Lime have been in the building industry since 12,000 BC, and there are many examples of building that are still living today.  
Although lime is not a strong material like cement, which means it is hardly used in modern buildings, it has other abilities, abilities that have helped many traditional buildings to survive to today and into the future, 
Lime products are vapour permeable, which means liquids/ moisture can be passed through lime, which will help the building from condensations, damps in and outside the building.
Lime are flexible and will allow small movement within the wall without cracking, even if the mortar does have small crack, it can be self-healed, so you don't have to worry about it too much,
Limes are sacrificial, so in the winter, if there are any frost damage, it will happen in the mortar itself, so you don't have to replace much more expensive parts such as bricks/blocks. 


There are many different types of lime, Slaked/putty/air/fat/high calcium and non-hydraulic lime, these type of lime doesn't set when its in the water, so it has to be exposed to oxygen for it to carbonate,  and it is the most appropriate lime for old/historic buildings which needs maximum permeability and flexibility.

Hydrated / bag Limes are the opposite, as it can actually carbonate witin the bag before it is used, if left long enough, so which is why  it is less sticky and less widely used. 

Hydraulic lime, 
Recent years hydraulic lime has successfully produced lime stones that has clay and other impurities which will produces a faster initial set in extreme conditions such as under water., as it can set without having the exposure to air.  there are many different types of hydraulic lime, and they are categorised by the compressing strength of the mortar after 28 days, and are named HNL – Naturlly hydraulic lime. 
NHL2 has less than 12% lime, which is slower to set,
NHL 3.5 has 12-18% clay, so it sets slightly faster,
NHL 5 has up 2o 25% Clay so it means it sets much faster, 
One have to gain enough knowledge about hydraulic lime before decide it which type to use and where.  

Hydraulic lime are supplied in the form of powder, so water and sand needs to be added in the correct ratio, 

Make ur own lime putty, it is produced by putting a British quicklime, in excess of water to allow it to mate, 
This fat lime putty can be blended with an appropriate aggregate to make a plaster/mortar. And it can be used to make lime wash by diluting it. 

Benefit of it is that it is tmost appropriate lime to be used in consercation of old buildings, where maximum softwness, vapour permeability and flexibility is required,

Glister is a mixture of glass and recycled glass to make the plaster/renders and mortars that are suitable for old buildings, ecological new building, and adds a surface finish to it for a different look