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Natural hydraulic binders

In our activity, we place special emphasis on completely natural and environmentally friendly mineral-based binders, which are indispensable in the field of monument renovation and organic architecture. Our offer includes various types of natural hydraulic lime that “sets even under water”, as well as higher-strength and fast-setting Roman cement, which is excellent for repairing monuments, and which has a European technical approval for this application.

Vicat Prompt natural fast-setting Roman cement

Vicat Prompt Roman cement can be placed between natural hydraulic lime NHL 5 and Portland cement in terms of strength and hydraulic properties. Thanks to the special composition of the clinker, it is a fast-setting cement that sets even under water. In order to ensure the appropriate workability time, it requires a variable amount of natural setting retarder, e.g. citric acid.

Natural hydraulic lime (NHL 3.5 and 5.0)

Natural hydraulic lime (NHL binder) is made from limestone that contains a suitable proportion of clay or silicates. The clay or silicate content ensures its “underwater”, partially hydraulic binding capacity. Mortars containing NHL are relatively resistant to water. Despite the partially hydraulic properties of NHL-type limes, the majority of the binding is still due to the reaction with CO2, i.e. the formation of calcium carbonate. For this reason, the favorable properties of air-hardening lime, such as high vapor diffusivity, are also present in NHL-labeled lime. Due to the properties of natural hydraulic lime, it can be placed between air-hardening natural lime and Roman cement.

Technical data sheets for the products can be found here.