Non-hydraulic lime
England in 2008, defines non-hydraulic lime (or putty lime) as: ‘Lime which will not set by chemical reaction with water but requires exposure to carbon dioxide in the air in order to harden. Unlike hydraulic limes (see Hydraulic lime), it is derived from pure limestone. It is commercially available in powder (hydrated) or putty form.’
Short Guide, Lime Mortars in Traditional Buildings, published on 1 March 2013 by Historic Scotland, defines putty lime as a: ‘Hydrated lime binder that has been slaked with an excess of water forming a wet paste that can be left to mature over time.’
Society for the Protection of Ancient Buildings (SPAB) definition online Glossary defines lime putty as: 'Calcium hydroxide (Ca(OH)2) formed as a paste when a non-hydraulic or weak (NHL 2) hydraulic lime is slaked in an excess of water and the milky suspension is allowed to settle. Can also be made by mixing hydrated lime (the form widely available in builders' merchants) and water, although this gives a less workable mix with inferior plasticity and binding properties.'
See also: Hydraulic lime.
[edit] Related articles on Designing Buildings
Featured articles and news
Celebrating architecture's eloquent champions.
Unusual perspectives on 1960s’ thinking.
AI and the challenges to intellectual property
The legal landscape of adopting AI now and in the future.
Worrying landscape for Welsh construction SMEs revealed.
In recent risk factor analysis report completed by CIOB.
Construction Sport survey highlights risks of dehydration
Supporting construction workers to avoid dangers.
Can your business afford to ignore mental well-being?
£70 - 100 billion annually in UK construction sector.
Mental health in the construction industry
World Mental Health Day 10 October.
Construction awards provide relief in wake of ISG collapse
Spike in major infrastructure awards, housing up but short of targets, are ISG collapse impacts yet to come.
Biodiversity net gain with related updates and terms
Only 0.5% of applications subject to BNG in the context significant proposed changes to planning.
As political power has shifted from blue to red
Has planning now moved from brown to green?
The role of construction in tackling the biodiversity crisis
New CIOB Nature of Building digital series available now.
The Nature Towns and Cities initiative
Grants of up to 1 million for local councils and partners.
The continued ISG fall out October updates
Where to look for answers to frequently asked questions.
Building safety remediation programme for Wales
With 2024 October progress updates.
In major support package for small businesses.
Conservation and transformation
Reading Ruskin’s cultural heritage. Book review.