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For example, the Great Wall of China, the Houses of Parliament and Rome Colosseum. PLEASE NOTE: Strongest isn’t always the best. Carefully choose which lime is most appropriate for the situation, selecting a weaker mix for a weaker, more porous masonry. 7. Pre-mixed hydraulic lime mortar. Remember the color of the sand will largely determine the color of the mortar! Available in NHL2 NHL3.5 or NHL5. Throughout history, in the construction of traditional stone buildings and stone walls, there have been two basic types of lime mortar used: hydraulic lime mortar and non hydraulic lime mortar. If not purchasing a pre-mixed mortar … It is the silica and trace elements that when burnt, become reactive with water and will cause an initial hydraulic set of the mortar when mixed with water. Both produce a mortar that can be used for various types of lime work including bedding, pointing and harling. Set Descending Direction. We are now able to offer a range of pre-mixed hydraulic lime mix suitable for re-pointing, rendering, plastering and bedding. Unfortunately, over the last 150 years or more, Portland cement based mortars have commonly been used for repointing joints that were previously filled with lime mortar. Traditional lime mortar, sometimes referred to as natural lime mortar are made using proportions of sand and lime, the lime acting as a binding agent. The less hydraulic a lime is, the more it will flex and move with a building. Why use hydraulic lime mortar? These historical buildings are still here today, due to its unique beneficial properties. Introduction When mixing separate bags of cement and lime, hydrated lime must be completely wetted out in the mixing process or it will continue to absorb water after mixing. By following the proper mixing procedures, excellent board life, workability and sand carrying capacities are achieved with lime mortars. It contains hydrated lime and plasticiser making it highly workable and cohesive. The most common formula of a Type-O mortar is 1:2:9, a blend of 1 part white Portland cement, 2 parts Type-S hydrated lime (most often dolomitic lime) and 9 parts sand by volume. Once the desired consistency is reached mix for a further twenty minutes. Roundtower Lime are a supplier of premium lime products to the conservation and eco build construction sectors. A lime:sand mortar mix may be produced by either: View Details. Lime mortar made with local sand to produce a pale-yellow coloured mortar using Morestead 3mm sand and St Astier natural hydraulic lime. Strength will also vary depending on the mix ratio and the type of aggregate used. For accuracy, use buckets or gauge boxes rather than shovels. Hello jttl We use a 3.5 Hydraulic lime mix for pointing (ratios: 1 hydraulic lime, 2 soft sand, 1 sharp/grit sand), and for walling we use 5.0 Hydraulic lime (ratios: 1 Hydraulic lime, 2.5 soft sand, 0.5 grit/sharp sand). Saint-Astier® NHL is pure and natural, free of additives, and has been in use throughout the world for over 150 years. Hydraulic lime is chemically very similar to non-hydraulic lime but it contains impurities, called pozzollans, that allow it to set in two stages: the first set is when water is added, and the second occurs as the mortar is exposed to the atmosphere. Weather resistant and durable, this mortar is ideal for most brick and block applications and is formulated to provide a general purpose mix of cement, lime and specially graded sand. The mix, to begin with, will appear dry but as mixing time increases the mortar will become much ‘fattier’. Lime pointing of traditional masonry using lime mortar based on lime putty or natural hydraulic lime (NHL) offers many advantages over cement based mortars. Buff coloured NHL 5 lime mortar. Sand colour will determine the colour. If you are working on a larger project, or a commercial development then we can mix mortars to your specific requirements and arrange silo storage for extra on-site convenience. 3 sand to 1 Lime putty is general mix. 11 Item(s) Show. Bricks of the 19th century through to even the 1950’s are more porous than today’s bricks. If too much water is added the risk of shrinkage will increase and the final strength reduced. Pre-Mixed Fat Lime Mortar (Blaenavon) Starting at: £6.50 . POINTING WITH LIME MORTAR Whether using a natural hydraulic lime or a lime putty based mortar, the application techniques are identical. Once this mixture is blended with water to form mortar, it can be used in many types of masonry construction projects. View Details. 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