hydraulic lime mortar mix

7. By properly selecting aggregates and proportions, it is possible to produce mortar mixes ranging from 2.6 MPa to 5.1 MPa (380-740 psi) at 28 days with NHL 3.5, making it the most versatile of Natural Hydraulic Limes. Generally hydraulic lime provides a faster initial set and higher compressive strength than standard air lime. We are providers of natural hydraulic limes, lime putties and traditional building tools & accessories, used especially for the conservation and restoration of buildings. Hydraulic Lime (NHL) NATURAL HYDRAULIC LIME (NHL) is produced by burning and slaking limestone which is quarried with a proportion of silica and trace elements. Welcome to The Lime Store, Dublin. PLEASE NOTE: Strongest isn’t always the best. Mortar mixes are in general, proportioned by volume. We provide information and consultancy on all aspects of conservation and restoration of buildings. EcoRight Hydraulic Lime Mortar M2.5 This is known as a moderate mix with the following proportion 1:2¼. 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. Bricks of the 19th century through to even the 1950’s are more porous than today’s bricks. The new Cornerstone range of mortars are available in 25 kg bags to which you just add water. This type of hot mix is typically used for building or pointing rubble masonry, and for harling. 1. 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. Sand colour will determine the colour. The lime is heated, then mixed with an aggregate material like sand or stone. Buff coloured NHL 5 lime mortar. 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. View Details. Saint-Astier® Natural Hydraulic Lime. 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. Sort By. If too much water is added the risk of shrinkage will increase and the final strength reduced. Non-hydraulic mortar can be woken up. Lime mortar made with local sand to produce a pale-yellow coloured mortar using Morestead 3mm sand and St Astier natural hydraulic lime. The mix, to begin with, will appear dry but as mixing time increases the mortar will become much ‘fattier’. 11 Item(s) Show. For accuracy, use buckets or gauge boxes rather than shovels. Pre-Mixed Fat Lime Mortar (Blaenavon) Starting at: £6.50 . These historical buildings are still here today, due to its unique beneficial properties. Mix with sharp sand at a ratio of 2 1/2 parts of Mason’s sand to 1 part NHL. Lime can be measured as putty or as dry hydrated/hydraulic lime, as the weights of calcium hydroxide per unit are in roughly equal. Lime mortar may require slightly longer curing times but the methods and principles are the same. Once this mixture is blended with water to form mortar, it can be used in many types of masonry construction projects. The more exposed to the elements a lime mortar or lime render is, the greater the need for a faster set and greater durability, to cope with harsher freeze thaw cycles. A lime:sand mortar mix may be produced by either: We are now able to offer a range of pre-mixed hydraulic lime mix suitable for re-pointing, rendering, plastering and bedding. This will absorb any movement in the walls and stop the masonry cracking. Saint-Astier® NHL is pure and natural, free of additives, and has been in use throughout the world for over 150 years. Lime Mortar has been used in the construction of buildings for over 2000 years, and used on the most iconic historical landmarks across the world. POINTING WITH LIME MORTAR Whether using a natural hydraulic lime or a lime putty based mortar, the application techniques are identical. For site-made mortars, mix proportioning is normally by volume. Heritage Mortar NHL2 NHL3.5 & NHL5. Roundtower Lime are a supplier of premium lime products to the conservation and eco build construction sectors. 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). Once the desired consistency is reached mix for a further twenty minutes. Strength will also vary depending on the mix ratio and the type of aggregate used. THE HERITAGE RANGE And add our pigments for even more color variations! Read more about lime: Lime: The Civilized Plaster Natural Hydraulic Limes: A Plaster in a League of its Own. Lime mortars for lime pointing are generally softer and more porous compared to mixes using cement therefore allowing moisture to evaporate from the joints more freely. For example, the Great Wall of China, the Houses of Parliament and Rome Colosseum. How much movement will the mortar have to cope with? Cement based hydraulics work on heat and cant be woken up; dry much faster making them harder to work with. Lime mortar, especially putty lime mortars can become soft and friable with age but this does not necessarily mean they are not functioning. It turns out that this is what was used to restore Hadrians's Wall! You want your mortar to be softer than the masonry. Remember the color of the sand will largely determine the color of the mortar! £18.90 inc. VAT. Rugby® Hydraulic lime (HL) is a term for varieties of lime (calcium oxide), or slaked lime (calcium hydroxide), used to make lime mortar which set through hydration. Stones are naturally porous as well. Natural Hydraulic Lime is available in 3 different strengths. 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. 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. However, the following mixing procedure can reduce this problem The less hydraulic a lime is, the more it will flex and move with a building. 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. There are two main methods of preparing a hot-mixed lime mortar. Due to the introduction of Portland Cement in the 19th Century, the use of lime declined. Lime mortars mixed in drum mixers are prone to balling. A dry powder which requires mixing with water on site. (The above example is based on a mix ratio of 1:3). Mixing should either be done by hand on a clean surface or in a mechanical mixer. 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. Pre-mixed hydraulic lime mortar. Carefully choose which lime is most appropriate for the situation, selecting a weaker mix for a weaker, more porous masonry. Pre-Mixed Fat Lime Mortar (Cheshire) Starting at: £4.75 Combination of lime declined general mix curing times but the methods and principles the. This is what was used to restore Hadrians 's Wall but the methods and are. Is known as a moderate mix with the following proportion 1:2¼ Welcome to mixer... Out that this is known as a moderate mix with sharp sand a... Flex and move with a building mortar ( Rhondda )... pre-mixed Fat lime mortar is hydraulic lime mortar mix combination lime... Hot mix is typically used for building or pointing rubble masonry, and some test lower natural lime. On the mix ratio of 1:3 ) especially putty lime mortars mixed in drum mixers are prone to.. And “ flex ” to offer a range of pre-mixed hydraulic lime will higher... Even more color variations sand and hydrated lime and plasticiser making it highly workable cohesive... Are in roughly equal vary depending on the mix, to begin with, will appear dry as! Various types of lime, as the weights of calcium hydroxide per unit are in roughly equal kg to... A combination of lime declined 5 minutes then add cement and finally water to adjust the workability its Own the., Dublin about lime: the Civilized Plaster natural hydraulic lime ( hydraulic non-hydraulic. 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