RJ1.05 NATURAL HYDRAULIC LIMES |
PRODUCT DATA SHEET |
DESCRIPTION: |
Natural Hydraulic Limes are produced by the calcination (burning) of limestones containing very fine silica and/or clay minerals (principally silica and alumina) at a temperature in excess of 950ºC. They are subsequently hydrated and supplied as a dry powder. A hydraulic lime will set underwater and unlike non-hydraulic lime does not set by carbonation alone. The speed of set and ultimate strength depends on various factors including the degree of hydraulicity of the lime itself. Natural Hydraulic limes are classified as NHL2, NHL3.5, and NHL5. |
USES: |
As binder in lime mortars where a higher compressive strength, lower porosity and permeability, or faster set is required. They are normally used where lime putty mortars are unlikely to prove durable - below ground and wet works, canal or tidal walls, weathering details, (exposed) external renders, or external winter working. Hydraulic limes should be thoroughly mixed with washed sands at 1:2, 1:2½, or 1:3 by volume (depending on application) and used immediately. |
AVAILABILITY: |
Singleton Birch NHL-2. Singleton Birch NHL3.5 St. Astier NHL-2, St. Astier NHL-3.5, St. Astier NHL-5. All ex-stock. |
SHELF LIFE: |
Up to 6 months if stored in original bags and kept
dry. Hydraulic limes deteriorate with age and fresh material should always be used. |
PACKAGES: |
25 and 30 kg bags according to type. |
HEALTH & SAFETY |
Alkali pH 13. Protect eyes, open cuts and skin. See Health
and Safety data sheet RJ 5.01A.
|
OBSERVATIONS: |
Experienced operatives familiar with the use of lime and with experience
of its successful use should be employed. Accurate volumetric site mixing
is essential. Hydraulic lime mortars do not behave as modern cementitious
materials. They set by a combination of the hydration of the hydraulic
compounds and carbonation. 'Carbonation' (in the presence of moisture)
is a slow process and the control of the drying and curing by 'tending'
and protecting is crucial to success and long term performance. Do not use in temperatures of 5ºC and falling. |