Gauged mortar
Hot-mixed Lime Mortar, published by Historic Environment Scotland in April 2015 states: ‘Quicklime can be combined with NHL to produce a ‘gauged’ mortar. Historically, mortars derived from Scottish limestones were often slightly hydraulic. As hydraulic quicklime is not readily available in the UK, gauging an NHL with quicklime attempts to replicate a traditional hydraulic hot lime mortar. Most hot-mixed lime mortars used in Scotland are prepared as gauged mixes, or (more rarely) with pozzolans.’
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