NHL 2
SKU:
$62.91
$62.91
per item
Natural Hydraulic Lime (NHL) 2 Feebly Hydraulic lime is used for applications such as the consolidation of frail historic masonry. It can be used where the highest amount of "free lime" is desired along with the greatest modulus of elasticity for applications such as when fine sand is added to make interior finish coats of lime plaster. It can be used to make very soft pointing mortars for repairing around friable historic masonry where the wicking away of water from the brick or stone to the lime mortar joint and out to the atmosphere is greatly encouraged. NHL 2 closely duplicates the material used for the majority of all building history as it is like lime putty in many of its properties. Traditional lime putty sets with air to fully cure over a six week period and it is referred to as an "Air Lime." NHL 2 sets with air and water and cures in about four days and is referred to as a "Water Lime."
Cured NHL 2 is about as hard as a piece of chalkboard chalk. Mixes containing NHL 2 and 1-2% casein powder can make an injection grout that will flow into every interstice in cavities behind plaster if you are considering exterior historic stucco re-attachment to re-establish the bond of the back of the stucco to the masonry substrate. Grout injections with NHL 2 can also be used to stabilize masonry before repointing. Consider using casein as the catalyst to increase flow rather than pulverized fly ash (PFA) since PFA is a pozzolan. Tests done on lime mortars modified with PFA raise the question as to whether run-away strengths may continually increase with on going densification of the lime/PFA grout. Increased densification may possibly trap moisture in cavities filled with lime and PFA.
Comes as a 55 pound bag.
This is the natural, untinted version. Contact us to order a tinted or custom color.
Choose this product when you have your own sand to mix in.
About NHL
Natural Hydraulic Lime, although it is basically of the same chemical composition as Hydrated Lime, has its initial set with water, much like cement, and a second set by absorption of CO2. Being "hydraulic" allows for simplicity in many applications. Hydraulic Lime, like Hydrated Lime and cement requires some basic care such as minimizing the amount of mixing water, using good sand and tarping the work. The cost of labor when using NHL is therefore comparable to normal cementicious mortar and stucco installations which have been carried out correctly.
The hydraulicity, (which in true form is the ability to set with water and under water), for the St. Astier lime range is achieved only by the nature of the raw material. The St. Astier raw material is a naturally occurring hydraulic lime which is low-temperature fired. Nothing else is added to St. Astier NHL, therefore it is known as "Natural" Hydraulic Lime. It has known and measurable performance criteria which is both comforting and predictably dependable.
Cured NHL 2 is about as hard as a piece of chalkboard chalk. Mixes containing NHL 2 and 1-2% casein powder can make an injection grout that will flow into every interstice in cavities behind plaster if you are considering exterior historic stucco re-attachment to re-establish the bond of the back of the stucco to the masonry substrate. Grout injections with NHL 2 can also be used to stabilize masonry before repointing. Consider using casein as the catalyst to increase flow rather than pulverized fly ash (PFA) since PFA is a pozzolan. Tests done on lime mortars modified with PFA raise the question as to whether run-away strengths may continually increase with on going densification of the lime/PFA grout. Increased densification may possibly trap moisture in cavities filled with lime and PFA.
Comes as a 55 pound bag.
This is the natural, untinted version. Contact us to order a tinted or custom color.
Choose this product when you have your own sand to mix in.
About NHL
Natural Hydraulic Lime, although it is basically of the same chemical composition as Hydrated Lime, has its initial set with water, much like cement, and a second set by absorption of CO2. Being "hydraulic" allows for simplicity in many applications. Hydraulic Lime, like Hydrated Lime and cement requires some basic care such as minimizing the amount of mixing water, using good sand and tarping the work. The cost of labor when using NHL is therefore comparable to normal cementicious mortar and stucco installations which have been carried out correctly.
The hydraulicity, (which in true form is the ability to set with water and under water), for the St. Astier lime range is achieved only by the nature of the raw material. The St. Astier raw material is a naturally occurring hydraulic lime which is low-temperature fired. Nothing else is added to St. Astier NHL, therefore it is known as "Natural" Hydraulic Lime. It has known and measurable performance criteria which is both comforting and predictably dependable.