A masonry mortar consists of sand, binders (usually air lime, hydraulic lime or cement), aggregates and water. The mortar used directly affects the strength of the masonry. The different types of mortar are regulated in DIN EN 998-2 and divided into different mortar groups according to compressive strength and water resistance.
More about mortar
Depending on the properties (absorption of specified compressive forces), mortar is divided into three groups of mortars:
- MG I (lime mortar)*
- MG II (lime cement / hydraulic mortar (2.5 MN/m²))**
- MG IIa (lime-cement mortar (5 MN/m²))**
- MG III (cement mortar (10 MN/m²))***
- MG IIIa (cement mortar (20 MN/m²))***
*I : without special strength requirements, only for low loads
**II : medium compressive strength, most common type of mortar
III: high requirements for compressive strength
Differentiation of mortar according to composition and type of use according to DIN:
- normal mortar (NM)
- medium-bed mortar
- thin-bed mortar (DM)
- light-bed mortar (LM) Planning
notes
According to the place and type of production, a distinction is made:
- Factory dry mortar: this mortar, which is delivered as a ready-made mixture, requires the addition of water on site
- Plant fresh mortar: this ready-to-use mortar can be applied for up to 36 hours
- Factory pre-mortar: this mortar, which consists of a mixture of sand and lime (possibly with aggregates), must be mixed with cement and water on the construction site
- Multi-chamber silage mortar: this mortar is delivered as a chamber system with separately stored mortar raw materials. On the construction site, these starting materials are mixed with the addition of water
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