|
NHL2 |
NHL3.5 |
NHL3.5
White |
NHL5 |
Why
is it important? |
| Physical
Properties |
| Colour |
White
(73 Value) |
Off-White |
White
(76.9 value) |
Pale
Buff |
Our
NHL3.5 White is the most white/brightest Natural Hydraulic Lime
available on the market - it is the best material to use where
sand colour reproduction is of priority. |
| Fineness
to 90µ |
4.50% |
7.00% |
4.10% |
7.20% |
The
exceptional fineness of Roundtower Natural Hydraulic Limes gives
an excellent plasticity and encourages high quality plastering
workmanship. |
| Fineness
to 200µ |
1.00% |
1.00% |
1.50% |
1.50% |
| Expansion
(soundness) |
0.0mm |
0.5mm |
0.2mm |
0.1mm |
The
near zero expansion of of NHL binders and the elasticity of
pure NHL mortars are such that joint free construction is possible. |
| Bulk
Density |
0.649
kg/dm3 |
0.779
kg/dm3 |
0.612
kg/dm3 |
0.636
kg/dm3 |
Binders
are bought by weight and used by volume. Bulk density is important
in evaluating economy comparisons. |
| Real
Density |
2.4
g/cm3 |
2.64
g/cm3 |
2.56
g/cm3 |
2.61
g/cm3 |
| Plasticity/Blaine
Value |
13200
cm2/g |
7119
cm2/g |
2.56
cm2/g |
10099
cm2/g |
The
Blaine Value establishes the number of material grains per cm2.
The high number of grains in Roundtower Limes gives the lime
a natural "Fatty", plastic consistency, much loved
by the user. |
| Free
Water |
0.50% |
1.04% |
1.51% |
1.12% |
Free
water is the moisture that is not combined with the material.
Excessive free water(>2%) can cause a premature hydraulic
set. Roundtower's low Free Water content allows for long shelf
life under normal enclosed warehouse conditions. |
Mechanical
Properties
|
| Setting
Times |
600
mn |
149
mn |
216
mn |
186
mn |
Early
initial set with slow long term hardening. |
| Compressive
Strength 7 Days |
0.9
Mpa |
1.70
Mpa |
2.21
Mpa |
2.18
Mpa |
Early
strength achievement is excellent in fighting frost attack. |
| Compressive
Strength 28 Days |
3.3
Mpa |
5.40
Mpa |
5.87
Mpa |
5.79
Mpa |
If
applied properly, NHL mortars will achieve great durability. |
| Penetration
Test |
35.6
mm |
29.9
mm |
34.2
mm |
28.6mm |
Flexible
mortars are essential to avoid cracking and are particulary
suitable for solid masonry construction. |
Chemical
Properties
|
| SO3 |
1.20% |
1.53% |
1.99% |
2.13% |
Less
than 3% has no detrimental effect on Lime or Lime mortars. The
minute amounts of SO3 present come from the fuel used during
calcination and not the raw material. |
| Free
Lime |
33.70% |
18.10% |
28.20% |
24.30% |
Roundtower
Natural Hydraulic Limes high percentage of Free Lime gives mortars
exceptional workability and self-healing properties. |
CaSO4
(Gypsum) |
<1% |
<1% |
<1% |
<1% |
The
presence of Gypsum can cause expansion, eflourescence and failures,
especially in marine climates. Roundtower Natural Hydraulic
Limes are all suitable for use in marine conditions. |
| C3S
(Tricalcium silicate) |
0% |
0% |
0% |
0% |
Indicates
possible cement additions. |
| C3A
(Tricalcium Aluminate) |
<1% |
<1% |
<1% |
<1% |
Reacts
with Sea Salts and other Sulphates. Can affect brick and stone. |
| Potassium
(K or K2O) |
<.5% |
<.5% |
<.5% |
<.5% |
Presence
of Alkalies, Potassium or Sodium, can cause Alkali/Silica reaction.
Reacts with the silicates in cement and sand producing gradual
disintegration. |
Sodium
(Na or Na2O) |
<.1% |
<.1% |
<.1% |
<.1% |
Quicklime |
0 |
0 |
0 |
0 |
Unslaked
lime will expand when hydrated. Makes products unstable. |
| Additions
(Waterproofers, plasticisers, water retainers, pozzolans, air
entrainers ) |
0 |
0 |
0 |
0 |
Due
to absence of setting agents, NHL mortars can be re-worked up
to 24 hours. Essential for minimising waste on site. |
| Soluble
Silica |
4%-8% |
8%-12% |
8%-12% |
12%-16% |
The
percentage of combined Silica will indicate a mortars hydraulicity.
Roundtower Natural Hydraulic Limes conform to the standard EN-459. |
| Loss
on Ignition |
25% |
19% |
17.26% |
14.85% |
The
loss on ignition is the sum of the free water, bound water and
carbon dioxide. |
