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Natural hydraulic lime

Natural hydraulic lime (NHL 3.5 and 5.0 binder) is made from limestone that contains a suitable proportion of clay or silicates. 
The clay or silicate content ensures the “underwater”, partially hydraulic binding capacity. 
Mortars containing NHL are relatively resistant to water. Despite the partially hydraulic properties of NHL-type limes, the majority of the binding is still due to the reaction with CO2, i.e. the formation of calcium carbonate. For this reason, the favorable properties of air-hardening lime, such as high vapor diffusivity, are also present in NHL-labeled lime. Due to the properties of natural hydraulic lime, it can be placed between air-hardening natural lime and Roman cement.

The marking of air-hardening and hydraulic lime according to the standard (MSZ EN 459-1:2015) differs in that air-hardening lime is classified based on the CaO + MgO content, while natural hydraulic lime is classified according to its compressive strength. The aforementioned standard includes the following strength classes: NHL 2, NHL 3.5, and NHL 5. The values of the numbers after 28 represent the minimum compressive strengths in MPa.

Application: facade repair of monuments, exterior and interior plasters, hemp concrete

Packaging: 25 kg bags, 1,575 kg / pallet, or 1,000 kg Big Bag.

The technical characteristics of the product are listed in the table below.

    Property
    CR NHL 3.5
    CR NHL 5.0
    MSZ EN 459-1:2015 standard
  


    Bulk density (g/cm3)
    0,7
    0,7
    n.k
  

    Consistency and colour
    light brown powder
    light brown powder
    n.k
  

    Compressive strength 7 days (Mpa)
    n.k
    2
    2 (NHL 5.0)
  

    Compressive strength 28 days (Mpa)
    4
    5
    NHL 3.5: 3,5, NHL 5.0: 5
  

    Compressive strength 40 days (Mpa)
    5
    n.k
    n.k
  

    Compressive strength 60 days (Mpa)
    7
    n.k
    n.k
  

    Compressive strength 90 days (Mpa)
    8,8
    n.k
    n.k
  

    Compressive strength 120 days (Mpa)
    9,8
    n.k
    n.k
  

    Sieve residue 0.2 mm mesh sieve (%)
    < 1
    < 1
    ≤ 2
  

    Residue on 0.09 mm sieve (%)
    < 5
    < 5
    ≤ 15
  

    Crash (mm)
    <0,5
    <0,5
    ≤ 2
  

    Free lime content (%)
    < 25
    < 15
    NHL 3.5 < 25, NHL 5.0 < 15
  

    SO3 content (%)
    < 1
    < 1
    ≤ 2
  

    Start of setting (hours)
    < 6
    4
    ≥ 1
  

    Fire resistance
    non-combustible
    non-combustible
    n.k
  

Property	CR NHL 3.5	CR NHL 5.0	MSZ EN 459-1:2015 standard
Bulk density (g/cm3)	0,7	0,7	n.k
Consistency and colour	light brown powder	light brown powder	n.k
Compressive strength 7 days (Mpa)	n.k	2	2 (NHL 5.0)
Compressive strength 28 days (Mpa)	4	5	NHL 3.5: 3,5, NHL 5.0: 5
Compressive strength 40 days (Mpa)	5	n.k	n.k
Compressive strength 60 days (Mpa)	7	n.k	n.k
Compressive strength 90 days (Mpa)	8,8	n.k	n.k
Compressive strength 120 days (Mpa)	9,8	n.k	n.k
Sieve residue 0.2 mm mesh sieve (%)	< 1	< 1	≤ 2
Residue on 0.09 mm sieve (%)	< 5	< 5	≤ 15
Crash (mm)	<0,5	<0,5	≤ 2
Free lime content (%)	< 25	< 15	NHL 3.5 < 25, NHL 5.0 < 15
SO3 content (%)	< 1	< 1	≤ 2
Start of setting (hours)	< 6	4	≥ 1
Fire resistance	non-combustible	non-combustible	n.k