The product has a CE Certification and is in full compliance with UNI EN It is produced through burning and staking a specifically selected shell limestone. The stabilizing process of CALCIDUR NHL 3.5 is effected through carbonation and hydraulic hardening. The limestones from which hydraulic limes are formed naturally contain a varied range of minerals of which silica and alumina are the main ones for creating hydraulic lime. Roundtower Natural Hydraulic Limes are natural products that contain no additives and are not blended. Natural hydraulic lime (NHL) is an important inorganic binder that can be hydrated in air and water [1–3]. Natural hydraulic lime mortars have good workability and plasticity and can accommodate some differential movement within the building. In recent years, the study of high hydraulicity natural hydraulic lime (NHL5) mortars has been in the focus of many researchers, as it is considered a compatible, eco-friendly binding material, which can be used both for the restoration of culturally and historically significant structures, as well as for the construction of contemporary buildings. Natural hydraulic lime, is an odourless powder, when mixed with sand and water it becomes a binder for building applications (e.g. Hydraulic limes are able to set without exposure to air, making them suitable for use in wet environments such as foundations, limecrete floors and pavings. Artificial hydraulic lime is made by adding forms of silica or alumina such as clay to the limestone during firing, or by adding a pozzolana to pure lime. Natural hydraulic and non-hydraulic lime mortars suitable for conservation and new build work. Generally, lime mortar mix ratio for brickwork ranges from 1:3 to 1:5 depending on the strength. 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. Natural hydraulic lime is a binder in powder form that has a predictable and reliable set. It is important to be careful with the mix proportions of mortars. In the world of NHL’s 3 different strengths are common: NHL 2.0- use for interior plasters/exterior stuccoes, old soft bricks and softer stone IE: sandstone etc. to EN 459-1. Secil Natural Hydraulic Lime (NHL 3.5) Natural hydraulic lime is available in three different grades – 2, 3.5, and 5. Suitable for general purpose mortars and renders, ideal for most building work. Mixed with sharp sand, natural hydraulic lime produces a creamy lime mortar favoured by builders and plasterers alike. The burning process produces calcium oxide and calcium silicates and calcium aluminates. Our range includes: traditional lime sand mixes, bonding layers for unstable substrates, base preparatory coats for thick and thin coat applications, salts containment, stabilisation and waterproofing, Natural hydraulic lime (NHL) as a building material has been widely used to restore the historic structure. This is particularly beneficial for use in traditional buildings. natural hydraulic lime We also supply natural hydraulic limes, derived from burning limestone which contains clay and other impurities. Table 1 gives its The East Coast is covered by De Gruchy’s Lime Works located in Pennsylvania. Suitable for … Natural Hydraulic Limes have unique qualities that have been tested by time and cannot be equaled. Hydraulic in “Natural Hydraulic Lime (NHL)” means that it sets up underwater instead of carbonating like non-hydraulic lime putty mortars. We recommend this product for historic structures built with harder brick or stone. Natural hydraulic lime mortars gain strength by a mixture of hydraulic action and carbonation. it’s 100% burnt limestone! The resulting material is ground, hydrated and carefully packaged. Essentially, as its name suggests, Natural Hydraulic Lime (NHL) is a naturally occurring lime material generally associated with building conservation or as a green, eco-building material. Nothing is added to the raw material…. Remember the mortar must be softer than the brick or stone it is matched with! Natural Hydraulic Lime, or "NHL" is a traditional material which combines some of the characteristics of ordinary lime with the more positive, through-setting characteristics of cement.It is produced by burning limestone that has naturally-occuring clay or silica impurities and then slaking to produce a fine powder. Lafarge has a long and strong track record of producing Natural Hydraulic Lime stretching back to the mid 1800s. 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. It is the silica and trace elements that when burnt, become reactive with water and will cause an initial hydraulic … BioLime® Natural Hydraulic Lime - NHL 3.5 BioLime® Natural Hydraulic Lime (NHL) 3.5 is designed for use in mortars and plasters for historical building restoration, quality building/construction and green building. Three classes of NHL were defined by the new version of the European Standard (EN459-1:2015) based on the compressive strength after 28 days of curing and the content of calcium In this work, the NHL-based mortars were pretreated by lithium silicate (LS) solution impregnation and surface spraying. 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