The bastard mortar is prepared with cement and lime. The use of these two binders gives a resistant mortar, quick enough, thanks to the cement, quite fat and smooth thanks to the lime and therefore easy to use. Count 1 bag of cement, 1 bag of lime, for 30 buckets of sand (or 6 wheelbarrows) and 80 to 100 l of water.
- Dosage of the bastard mortar
- Mixing of the various mortar components
Dosage of the bastard mortar
1. Sift the sand to remove impurities: keep only fine aggregates. Using a bucket of known capacity, pour the sand into the cleaned trough. The amount of sand, relative to the binders, varies depending on the use of the mortar.
2. In general, care must be taken not to reduce the amount of sand too much, as it gives the mortar its plasticity and homogeneity. A small amount of sand produces an unstable mortar, with a strong shrinkage on drying.
3. Fill the bucket with cement to the mark indicating a certain volume. A larger amount of cement increases the strength and impermeability of the dry mortar and accelerates its setting, which is not always an advantage.
4. To prepare a bastard mortar, use portland cement or natural or masonry cements (EMC 1 32.5 N, ex CPA).
5. The dosage of natural hydraulic lime (XHN) is done by means of a can of which the capacity is known.
Mixing of the various mortar components
1. Mix the various components. The homogeneity of the mixture must be perfect, and its uniform color. Beforehand bring the trough to the work site: the mortar must be spoiled on the spot, because the transport time weakens the homogeneity.
2. Add the water and knead. The amount of water varies with the granulometry of sand a fine sand requires more water. The bastard mortar has a creamy consistency. A lumpy appearance indicates a lack of water.
3. A mortar that is too liquid is indicated by a film of water on the surface: in use, it has a strong shrinkage and remains very permeable after drying.
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