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Since the first humans began to settle down as an agricultural society at the very dawn of civilization, continuing for thousands of years until the middle of the 19th century, only five mineral binders were used to create plasters and mortars.
I’ve been using natural cements and natural hydraulic limes in the traditional plastering craft for many years. However, I never had the opportunity to visit a quarry where the unique limestones used to produce them are mined.
The natural designation indicates that the raw material - a type of limestone known as clayey marl - is simply mined and burnt with no further additions.
This article will cover the classification of NHL's and highlight the balanced rationale based on experience, science, and practical use reflected in the European standard.