
Betonfix DM
Expansive mortar for silent, non-explosive demolitions
Betonfix DM is a very expansive mortar which is suitable for demolition works, rock and concrete cutting. When water is added to Betonfix DM, the product increases its volume considerably, creating a pressure of 80 MPa on the walls containing the hole. It does not emit gases or leave harmful residues.
Applications
Betonfix DM is used for demolition works where it is not possible to use explosives or heavy vibration. Betonfix DM can be used for the excavation of foundations and trenches; removal of large rocks; demolition of stone materials, concrete and reinforced concrete works (taking the necessary precautions); demolition of works in clay bricks and refractory bricks; underground and underwater excavations.
Application
Betonfix DM is a powder which have to be mixed with clean water according to the quantities shown in the table. Its operating temperature is between + 5 °C and + 20 °C. It is advisable to test it in case of lower temperatures, in this case preliminary tests have to be made with hot water. If temperature is above + 20 °C test it with cold water. Mix to obtain a creamy, fluid and no lumps mortar. Pour into the holes previously prepared within 5 to 10 minutes. Horizontal holes must be sloped to facilitate insertion of Betonfix DM; It is not necessary to tap the hole and only in case of rain should be covered with waterproof material. When using on absorbent materials such as concrete, the holes must be dampened before pouring the product. There should be no water in the holes: in case of large infiltrations or if there are cracks that avoid the holes to be filled, it is advisable to put in the hole a PVC bag and fill it. The distance between one hole and another changes according to their diameter (generally Ø32 - Ø50) and the type of material to be demolished or cut. For instance, rocks and concrete: • Ø32: centre to centre 40 cm; • Ø35: centre to centre 50 cm; • Ø40: centre to centre 60 cm; • Ø45: centre to centre 70 cm; • Ø50: centre to centre 80 cm. Betonfix DM exerts a swelling pressure of 800 kg/cm². The tensile strength of different kinds of rocks: Ensure that the breaking-plan is parallel to the main iron rebars to prevent that the action of the product takes place in the same direction of the iron since its action in this case would be ineffective.
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