Features and Benefits

Fine-grained repair mortar

1-component, fine-grained repair mortar for producing layers of 5 to 30 mm thickness


  • For concrete class above C12/15
  • Reinforced with fibers
  • Low shrinkage
  • Resistant to frost and de-icing road chemicals
  • Fast manual and mechanical application
  • For vertical and horizontal surfaces
  • Amount required: approx. 2 kg/m2 for 1 mm layer thickness 

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Ceresit D 25 is used to smooth out concrete and reinforced concrete, to fill repair damaged substrates. The range of application is from 5 to 30 mm. CD 25 is part of the concrete repair system Ceresit PCC, which additionally consists of CD 24, CD 26, CD 30. The system is designed for filling cracks/voids and re-profiling balconies, as well as for making complex repairs for various types of cement and reinforced concrete structures, such as balconies, overpasses, reinforced concrete ditches, ceilings, tanks (including waste treatment plants), flyovers, frame structures and multi-board structures, monolithic structures (including swimming pools), chimneys, etc.

Step by step

Substrate preparation


Ceresit CD 25 adheres to crack-free, load-bearing, clean concrete substrates free from any substances, which may impair adhesion. The substrate should have sufficient compressive strength (concrete class above C12/15) and pull-off strength of minimum 1,0 MPa. Concrete Corroded and carbonated concrete and any loose elements should be carefully removed. Any stains the layer of cement wash, anti-adhesion agents, old layers should be mechanically removed. The surface of the concrete should be rough and porous, ensuring good adhesion. The substrate should be mechanically prepared e. g. through abrasive blasting, grounding or milling. Reinforcement The corroded reinforcing bars should have the concrete support removed up to the places which are not corroded. The reinforcing bars should have rust removed by sand – blasting to the degree of cleanliness of Sa 2,5 so that they acquire clear, metallic appearance and then they should be cleaned with compressed oil free air. Before the application of Ceresit CD 25, the uncovered reinforcing bars should be covered with anticorrosion protection CD 30 twice. Concrete substrates should be sprayed with water without any puddles formed and then the slightly damp substrates and the previously protected reinforced steel should be covered with the contact layer Ceresit CD 30. The repair mortar should be applied on the slightly damp contact layer, however, not longer than after 30–60 minutes. In case of exceeding this time, the contact layer should be applied once again provided that the previous layer is completely dry.



Preparation of the mortar: The content of the packaging should be poured to the measured amount of clean water and mixed with the slow rotating drill with a mixer until the homogenous mass without lumps is obtained. Then it is necessary to wait 3 minutes and mix the mortar once again. Application of the mortar: Within the pot life the ready mortar should be applied with the trowel on the freshly applied contact layer or poured to the form and it should be properly structured. In case of larger areas it is advisable to use vibration scantlings. The surface of the filler should be smoothed with the steel trowel or with the plastic trowel or sponge within approx. 5–20 min. Mortar Ceresit CD 25 may be applied with the application of a gunite method. Mortar can be applied on the single application on the vertical surfaces up to 30 mm thickness. In case of the application of mortar in a few layers or the application on mortar CD 26 the time between the consecutive applications should not exceed 3 hours. Otherwise it is necessary to wait 24 hours, make the substrate damp again, to apply contact layer and only tore-apply the filler. Mortar Ceresit CD 25 can be used as the final layer. After 2 days mortar Ceresit CD 25 can be covered with the filler Ceresit CD 24. Additional protection of concrete: The additional protection for concrete against corrosion, harmful water impact, frost, aggressive agents and weather is to cover the mortar of CD 25 with acrylic paint Ceresit CT 44 or flexible insulation layer Ceresit CR 166. These layers can be applied after 3 days when CD 25 has been applied.