For conservation and restoration lime grouts, lime concrete and lime screeds are ideal mortars due to the characteristics of these vapour permeability. Natural hydraulic lime, or nhl is a traditional material which combines some of the characteristics of ordinary lime with the more positive, throughsetting characteristics of cement. Natural hydraulic lime clinton long project management pty. Astier nhl is pure and natural, free of additives, and has been in. Fat lime slakes rapidly when water is added giving out considerable. Lime industries lime putty is used for plastering in thousands of homes and buildings every year. Hydraulic lime slakes very slowly sometimes taking several hours even days to do so without producing.
Use natural hydraulic lime where the need for breathability and flexibility is outweighed by the need for strength. Enables work to be completed quicker, saving time and money. It is an exclusive result of the chemical composition of its natural raw materials. No extraneous materials or additives that would modify the natural composition of the original stone are used in production. A hydraulic binder is obtained adding to the lime airhardening binder different materials that confer it the aforementioned properties. Natural hydraulic lime nhl mortars are widely used for restoration works due to their. Unlike lime putty which is nonhydraulic, natural hydraulic lime can set in damp conditions indeed it requires water for a minimum period of around 72 hours to gain strength. Production of good hydraulic lime is as much a craft as a technology, even more than ordinary lime but, with the decline in use of.
Hydradur is an eminently natural hydraulic lime en 4591 nhl 5 hydradur is an eminently hydraulic lime binder produced from cooking limestone in a shaft kiln. Hydraulic lime, practical advantages the ancient, natural building material thats ideal for the modern builder. Lafarge nhl, natural hydraulic lime, is now available to the us market from prima terra plasters. Flexible and slow setting, suitable for interior brickwork.
Banfill and others published deterioration of natural hydraulic lime mortars, ii. Soft, fatty and slow setting, it is perfectly suited for conservation of delicate materials and buildings. Fat lime is produced from sea shell, coral deposits etc or from lime stone containing impurities like free sand and soluble silica combined with alumina, magnesium, carbonate etc. Easy to mix, lime for renovation, conservation and new builds. Natural hydraulic lime nhl has been produced in saint astier since 30 bc and produced on an industrial scale since 1851. Table 1 gives its chemical characterization according to european standard 21 and fig. Natural hydraulic limes with independent thirdparty certification. Moreover, the influence of the composition and production process on such. Natural hydraulic lime works by setting in the presence of water, hence the term hydraulic. Not only is natural hydraulic lime an important material in historical preservation and restoration of many buildings worldwide. The word lime originates with its earliest use as building mortar and has the sense of sticking or adhering. Zcompressive strength of lime base mortars are usually quoted at 91 days rather than 28 lime based mortars will typically have reached half its 91 day strength by 28 days. Estimating your natural hydraulic lime order strawbale.
Effects of chemically accelerated leaching on physical and mechanical. 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. Mechanical behavior of natural hydraulic lime mortars intechopen. Secil, has been producing natural hydraulic lime for over 100 years in portugal. Not applicable, multi constituent substance origin. With the lime revival of the past 25 years which for many years was primarily based on the use of pure, non hydraulic lime prepared as a putty mixed with a wellgraded aggregate it is interesting to note that there has been an emphasis on the common use of a 1. It sets with water rather than with air as with lime putty hence the term hydraulic. Hydraulicity and properties of st astier natural hydraulic lime.
Unilit natural hydraulic lime natural hydraulic lime. St astier natural hydraulic lime nhl was used to reflect modern repair specification and application in the uk. Astier natural hydraulic lime nhl is an industrystandard used for historic restoration mortar, stucco, and plaster with no harmful portland cement present or required. Essentially, as its name suggests, natural hydraulic lime nhl is a naturally occurring lime material generally associated with building conservation or as a green, ecobuilding material. The hydraulic lime composition according to claim 1 in which the average particle size of the pozzolanic material is in the range 0. Building lime lime industries lime putty is used for plastering in thousands of homes and buildings every year. Mar 05, 2012 lafarge nhl, natural hydraulic lime, is now available to the us market from prima terra plasters. Under this standard, nhl products are assigned to one of three classes nhl 2. Astier nhl is pure and natural, free of additives, and has been in use throughout the world for over 150 years.
Diagrammatic representation of selection process for hydraulic lime mortars. Our unique manufacturing process has delivered consistent faultless products for over 40 years. It is produced through burning and staking a specifically selected shell limestone. This is particularly beneficial for use in traditional buildings. Natural hydraulic lime nhl is the traditional lime in powdered form. Hydraulic lime, natural hydraulic lime reach registration number. Hydraulicity is the property of a binder to harden in contact with water. Comparative testing of hydraulic lime and opc mortar mixes.
Pdf mechanical behavior of natural hydraulic lime mortars. Mechanical behavior of natural hydraulic lime mortars. Natural hydraulic lime natural hydraulic lime nhl marketed in the uk complies with bs en 4591. Composition and uses of lime and mortar building technology. The traditional process involves firing, slaking, aging, and then grinding prior to final packaging. Its use dates back to the times of the ancient egyptians, greeks and romans but declined during the 19th century with the emergence of ordinary portland. Secil natural hydraulic lime 5 secil natural hydraulic lime nhl features the same properties it used to have, decades ago, before the introduction of portland cement. Opened bags should be folded over at the end of the day and stored in a dry place. The hydraulic lime composition according to claim 1 in which the average pore diameter of the pozzolanic material is greater than 0. Calcidur nhl 2 composition calcidur nhl 2 is a natural hydraulic lime acc. From a mineralogical point of view, it is mainly composed of portlandite caoh 2, dicalcium silicates c 2 s, gehlenite c 2 as, and small amounts of tricalcium silicates c 3 s. Production of good hydraulic lime is as much a craft as a technology, even more than ordinary lime but, with the. Mechanical properties of natural hydraulic limebased. Mortar is defined as a paste obtained by adding water to.
Mechanical properties of natural hydraulic limebased mortars. These components impart the property of hydraulicity to lime. Natural hydraulic lime nhl marketed in the uk complies with bs en 4591. It is identical to hl but its composition must be declared on the ce marking. Estimating your natural hydraulic lime order by andrew morrison in construction details, plastering 20 plastering is hard enough, so dont beat yourself up trying to figure out how much plaster you will need.
Saint astier natural hydraulic lime transmineral usa, inc. These contrast with varieties of air lime, the other common types of lime mortar, which set through carbonation reabsorbing carbon dioxide co 2 from the air hydraulic lime provides a faster initial set and higher. We generally recommend the use of hydraulic lime where the need for breathability and lower strength is outweighed by the desire for an earlier and harder set. These grades are based on the compressive strength of laboratory mortars at 28 days. Storage of lime and aggregate it is important that you store the natural hydraulic lime in a clean and dampfree environment, as exposure to moisture will weaken the strength of the natural hydraulic lime nhl. The characteristics of the raw materials are unique and consist of an undisturbed layer of calcareous rock infiltrated mainly by silica with only traces of other minerals. Calcium reacts in the lime kiln with the clay minerals to produce silicates that enable some of the lime to set through hydration. Hydraulic lime an introduction hydraulic lime was an important cementitious material before the arrival of portland cement but it is little used now, except in conservation work. Hydrated lime vs hydraulic lime traditional building. Hydraulic lime mortar 100% natural, traditional lime. Natural hydraulic limes amicus green building center. Also suitable for soft masonry and conservation of materials that are decaying or crumbling. These are sometimes called semihydraulic lime and include the classifications feebly and moderately hydraulic lime, nhl 2 and nhl 3.
Non hydraulic lime mortar decide which of the two basic types of traditional lime mortar is most suitable. Simply add up to 5% brick dust to your quick lime and voila, you have a lime with similar properties to hydraulic lime. These contrast with varieties of air lime, the other common types of lime mortar, which set through carbonation reabsorbing carbon dioxide co 2 from the air. In both cases, they possess a range of degrees of hydraulic set. Saint astier natural hydraulic limes nhl safety data sheet. Pdf a framework for specifying natural hydraulic lime mortars for. Lime is a calciumcontaining inorganic mineral composed primarily of oxides, and hydroxide, usually calcium oxide and or calcium hydroxide. Table 1 shows the anhydrous binder composition as provided. Hydradur is an eminently natural hydraulic lime en 4591 nhl 5 hydradur is an eminently hydraulic lime binder. Natural hydraulic lime nhl mortars are widely used for restoration works due to. This site contians a wealth of information to enable anyone from the specifier to the tradesman to ensure the correct solution is implemented correctly.
Although its production capacity was limited to just 20 kilns, which produced 50,000 tons per year, lafarge rose to the challenge. Characteristics of the seven mortar compositions prepared. Natural hydraulic lime 2 binders anglia lime company. Mixed with sharp sand, natural hydraulic lime produces a creamy lime mortar favoured by builders and plasterers alike. Saint astier natural hydraulic limes nhl safety data. Natural hydraulic lime is supplied in three european classifications. They are also often termed feebly hydraulic, moderately hydraulic and eminently hydraulic. Jan 18, 2011 composition and uses of lime and mortars. Natural hydraulic lime nhl is a binding material formed by burning of argillaceous or siliceous limestones with reduction to powder by slaking with or without grinding.
Providing the ultimate in workablity for plaster white setting, lime putty delivers high water retention and bond strength when used in mortars. Nhl 5 according to compressive strength after 28 days, as determined by standardised tests. An eminently hydraulic lime suitable for use in masonry pointing, capping, foundations, seal defences and new build construction our products contain no additives, mineral additions or portland cement and are quality assured to en 4591. The designation hydraulic lime hl usually indicates that the lime contains cement whereas formulated limes fl have stricter requirements for declaring the chemical content of the lime produced. It is produced through burning and staking a specifically selected. Transmineral, usa was established in 1997 by michel couvreux, an architect in france and the u. It sets hydraulically, curing much faster than nonhydraulic lime. They use hydrated lime which is converted to a basic form of hydraulic lime during the sugar extraction process.
Hydraulic lime is obtained from limestone or kankar, containing a very small %age of free sand and soluble silica combined with 1039% of clay and magnesium carbonate. Deterioration of natural hydraulic lime mortars, i. Hydraulic lime mortar for stone, brick and block masonry. Astier natural hydraulic lime is the natural solution for virtualy any restoration, conservation or new build project. It is produced by burning limestone that has naturallyoccuring clay or silica impurities and then slaking to produce a fine powder. This book covers in depth the composition and use of hydraulic lime mortars in an accessible. His familiarity with traditional old world building techniques and materials have been instrumental in their revitalization in the u. Natural hydraulic limes have unique qualities that have been tested by time and cannot be equaled. Natural hydraulic lime clinton long project management. In hydraulic lime the comples aluminiumcalciun silicate splits into simpler compounds of calcium silicate and calcium aluminates which crystallize in the presence of water to form a hard mass of great strength even in the interior parts of structure and the calcium hydrates highly soluble in water comes out to the surface, gets co2 and crystallizes to caco3 and hardens.
Telling lime distribute the unilit range of natural hydraulic lime mortars and plasters in the ukireland along with corical and coridecor lime putty paints, lime washes and polished plasters. Feebly hydraulic lime contains 510% clay, slakes in minutes, and sets in about three weeks. The perceived difficulty associated with working with lime is removed by the introduction of unilit lime products. Natural hydraulic lime nhl is produced by heating calcining limestone that naturally contains clay and other impurities. Properties of fat lime characteristics of fat lime in. Hydraulic lime mortar 100% natural, traditional lime conserv.
Natural hydraulic lime limelite tarmac buxton lime. Calcidur is a natural hydraulic lime en 4591 nhl 3. Natural hydraulic lime nhl natural hydraulic lime or nhl comes from limestone that has natural impurities of clay and other minerals, the amount of impurities within it determines how hard it will set. Natural hydraulic limes are made today in much the same way as they have been for centuries. It is called artificial hydraulic lime ahl and is frowned upon in placed like france and england where restoration work requires high quality control. Properties of hydraulic lime composition and behaviour. This hydraulic lime is a commercial lime of the class hl5 according to european normative, and it has been supplied by chaux bruyeres saintfrontsurlemance, fumel.
Our natural hydraulic lime features a unique brownish colour due to the characteristics of the. A study of the workability of natural hydraulic lime. For lots of detailed information on lime and its uses visit. Otterbein natural hydraulic limes atlas preservation. Hydraulic lime hl is a general term for varieties of lime calcium oxide, or slaked lime calcium hydroxide, used to make lime mortar which set through hydration. Hydraulic lime hl is a general term for varieties of lime calcium oxide, or slaked lime. It is also the name for calcium oxide which occurs as a product of coalseam fires and in altered limestone xenoliths in volcanic ejecta. Natural hydraulic limes have unique qualities that have been tested by time and are unrivaled. Product safety data sheet natural hydraulic lime page 2 of 9 rev 2 arc 2014 2. Hydraulicity is produced by burning a limestone containing silica, alumina and iron oxides which above certain temperatures combine, totally or partially, with the calcium oxide. Secil natural hydraulic lime is certified to the current version of en 4591. The stabilizing process of calcidur nhl 2 is effected through carbonation and hydraulic hardening. The perceived difficulty associated with working with lime is removed by the introduction of. Hydraulic lime is available in three grades, heres why and how it works.
Pdf deterioration of natural hydraulic lime mortars, ii. Description natural hydraulic lime nhl is used to create mortars and plasters which are generally more sympathetic than sandcement mixes. Good mortar is of vital importance in all brick or block walls because it bonds the units together, thus, it helps to carry the weight placed on the wall and seals the joints to provide a weatherproof wall. Natural hydraulic lime natural mortars by edison coatings, inc. Pure limes are not hydraulic and are also known as nonhydraulic, air or putty limes. Natural hydraulic lime tolerates the transfer of damp and salts without deterioration even if this occurs during the very early days of carbonation. If the proportion of free sand is large, the resulting lime becomes progressively poor and is called poor or lean lime. Hydraulicity and properties of pure natural hydraulic. This timehonored product is enjoying a modern comeback due to its performance and beauty.
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