RELATED MATERIALS:
- DUROCRET polymer-modified cement mortar
- RAPICRET rapid-setting repair mortar
- UNICRET cement-lime mortar
- UNICRET-FAST fast-setting cement-lime mortar
- ADIPLAST polymer additive for mortars
- FIBERGLASS MESH 160 (alkali resistant reinforcing mesh)
I. NATURE OF THE PROBLEM - REQUIREMENTS
Cracks wider than 1 cm and disorganised masonry occur in old buildings or after earthquakes. They lead to separation of the masonry from the supporting frame, loss of strength and appearance. The repair mortar must bond strongly to the substrate, be workable and have low shrinkage to avoid further cracking.
II. SOLUTION
Repair consists of two parts: filling the crack and restoring the plaster. For crack filling, use DUROCRET or RAPICRET. These mortars develop high strength and have low shrinkage. For plaster restoration use UNICRET or UNICRET-FAST. Adding ADIPLAST improves adhesion and reduces shrinkage. Reinforce the plaster with alkali-resistant fiberglass mesh embedded in the fresh mortar.
III. APPLICATION
1. Crack repair
- Remove any loose plaster and widen the crack to a depth of about 5 cm. Remove dust and dampen the surface.
- Prepare DUROCRET (or RAPICRET for faster hardening) according to the instructions. Fill the crack carefully in layers and compact each layer with a trowel.
- Finish flush with the surrounding wall and roughen the surface to improve adhesion of the plaster.
2. Plaster restoration
- Remove any loose or damaged plaster around the crack and clean the substrate. Dampen it with water.
- Prepare UNICRET or UNICRET-FAST mortar and add ADIPLAST as an admixture (about 1 kg ADIPLAST per 25 kg mortar) to improve adhesion and reduce shrinkage.
- Apply a spatterdash layer of the modified mortar onto the damp substrate.
- While the spatterdash layer is still fresh, press a strip of FIBERGLASS MESH 160 into it over the crack.
- After the spatterdash sets, apply the finishing coat of the modified mortar in one or two passes to the required thickness. Finish with a float.
IV. REMARKS
- Apply mortars at temperatures between +5 C and +35 C.
- Do not add water or mix up mortars after they start to set.
- In hot or windy weather keep the repaired area damp for at least 48 hours.
- Read the safety instructions on the product packaging and wear appropriate personal protective equipment.
- DUROCRET polymer-modified cement mortar
- RAPICRET rapid-setting repair mortar
- UNICRET cement-lime mortar
- UNICRET-FAST fast-setting cement-lime mortar
- ADIPLAST polymer additive for mortars
- FIBERGLASS MESH 160 (alkali resistant reinforcing mesh)
I. NATURE OF THE PROBLEM - REQUIREMENTS
Cracks wider than 1 cm and disorganised masonry occur in old buildings or after earthquakes. They lead to separation of the masonry from the supporting frame, loss of strength and appearance. The repair mortar must bond strongly to the substrate, be workable and have low shrinkage to avoid further cracking.
II. SOLUTION
Repair consists of two parts: filling the crack and restoring the plaster. For crack filling, use DUROCRET or RAPICRET. These mortars develop high strength and have low shrinkage. For plaster restoration use UNICRET or UNICRET-FAST. Adding ADIPLAST improves adhesion and reduces shrinkage. Reinforce the plaster with alkali-resistant fiberglass mesh embedded in the fresh mortar.
III. APPLICATION
1. Crack repair
- Remove any loose plaster and widen the crack to a depth of about 5 cm. Remove dust and dampen the surface.
- Prepare DUROCRET (or RAPICRET for faster hardening) according to the instructions. Fill the crack carefully in layers and compact each layer with a trowel.
- Finish flush with the surrounding wall and roughen the surface to improve adhesion of the plaster.
2. Plaster restoration
- Remove any loose or damaged plaster around the crack and clean the substrate. Dampen it with water.
- Prepare UNICRET or UNICRET-FAST mortar and add ADIPLAST as an admixture (about 1 kg ADIPLAST per 25 kg mortar) to improve adhesion and reduce shrinkage.
- Apply a spatterdash layer of the modified mortar onto the damp substrate.
- While the spatterdash layer is still fresh, press a strip of FIBERGLASS MESH 160 into it over the crack.
- After the spatterdash sets, apply the finishing coat of the modified mortar in one or two passes to the required thickness. Finish with a float.
IV. REMARKS
- Apply mortars at temperatures between +5 C and +35 C.
- Do not add water or mix up mortars after they start to set.
- In hot or windy weather keep the repaired area damp for at least 48 hours.
- Read the safety instructions on the product packaging and wear appropriate personal protective equipment.
