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Cement mortar with low capillary rise.

autorzy: Natalia Szemiot, Łukasz Sadowski

The subject of the invention is a cementitious mortar with low capillary rise. The essence of the invention is to add a water-glass admixture to the cement mortar. The mortar consists of mixing together: Portland cement CEM I 42.5R in the amount of 0.5 part. wt., water in the amount of 0.34 parts. by weight, dried quartz, granite or basalt sand in the amount of 2.14 parts. wt. and sodium water glass in the amount of 0.005 parts. wt. The cement mortar according to the invention is characterized by low capillary rise. The invention is convenient to use and can be used to make floors with low capillary rise and as a solution to the problem of excessive moisture in brick walls. The main benefit of using water glass is a significant reduction in the capillary rise index of the mortar. The invention is illustrated by the following examples: Example 1 - Component A - CEM I 42.5R Portland cement in the amount of 0.5 kg, - Component B - water in the amount of 0.34 kg, - Component C - dried quartz sand with a fraction of 0-2 mm and a bulk density of 2.62 in the amount of 2.14 kg, - Component D - sodium water glass in the amount of 0.005 kg. The composition of the water glass: Na2O + SiO2 in the amount by weight 30%, the rest - water. Example 2 - Component A - CEM I 42.5R Portland cement in the amount of 0.5 kg, - Component B - water in the amount of 0.34 kg, - Component C - dried granite sand with a fraction of 0-2 mm and a bulk density of 2.60 in the amount of 2.14 kg, - Component D - sodium water glass in the amount of 0.005 kg. The composition of the water glass: Na2O + SiO2 in the amount by weight 30%, the rest - water Example 3 - Component A - CEM I 42.5R Portland cement in the amount of 0.5 kg, - Component B - water in the amount of 0.34 kg, - Component C - dried basalt sand, fraction 0-2, bulk density 3.07, 2.14 kg, - Component D - sodium water glass in the amount of 0.005 kg. The composition of the water glass: Na2O + SiO2 in the amount by weight 40%, the rest - water. In order to prepare a mortar according to the above compositions, components A, B, C and D are mixed with a steel mixer for mortar until a homogeneous consistency is obtained.

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