Compression layer with light structural screed mortar
Civil work
Edification
SoluciónCompression layer with light structural screed mortar
Descripción sistema
Location
Housing in the neighborhood of Barceloneta (Barcelona)
Dimensions
Approx. 30 m2
Intervention date
Year 2017
Molins Products
PROPAM® LIGHT screed AR
BETOPOX® 93
The home in which Molins products have been applied corresponds to one of these rooms in the house, and is located in a PB+2 building, whose horizontal structure (slabs) is composed of wooden joists and ceramic vault.
nReason for intervention
Within the framework of rehabilitation of the home, which included its structural adaptation, it was determined to lift some areas of the pavement in which defects of important planimetry, to proceed with its repair and leveling.
When carrying out this operation, it is verified that:
» The pavement, made up of unglazed ceramic tile, is placed on a base layer of unreinforced mortar.
» The wooden joists are in apparent good condition, with loss of section in some areas.
Challenges and limitations
» Protect the wood of the joists against the action of environmental humidity.
» Prevent the mixing water of the mortar with which the compression layer is made from affecting the wooden joists.
» Obtain a good physical union between the wooden joists and the compression layer
» Obtain mechanical performance of the compression layer greater than 30 N/mm2 (at 28 days) with an average thickness of 7 cm of lightened mortar.
Molins Solution
n» Application of a protective layer of BETOPOX® 93 on the surface of the joists.
» Once the connectors are installed, in order to promote mechanical adhesion between the compression layer and the joists, application of new layer of BETOPOX® 93 with sprinkling of fine natural quartz aggregate while the resin is still fresh.
» Installation of electro-welded mesh for load distribution.
» Pouring of the mortar PROPAM® LIGHTWEIGHT SCREW AR for formation of the compression layer .
Execution
» 1. Cleaning any remaining dust from the surface of the joists, and application of a first layer of BETOPOX® 93, a two-component bonding bridge based on low viscosity epoxy resins, with a dosage of 150 g/m2, which will act as a protective barrier against environmental humidity. BETOPOX® 93 meets the requirements of the EN 1504-7 standard.
n» 2.Installation of connectors that allow a better physical union of the joists with the compression layer. Application of a layer of BETOPOX® 93 with a dosage of 200 g/m2, and sprinkling of natural quartz aggregate (0.4-0.9 mm) until saturation, while the resin is still fresh. After 24 hours, sweep the surface to remove any non-adhered aggregate. By preparing the surface of the joist in this way, the grip (mechanical adhesion) of the compression layer to it is favored.
< !-- wp:image {"id":42746,"width":281,"height":211,"sizeSlug":"full","linkDestination": "none"} --> n» 3. Fixing the electro-welded mesh (Ø 5 mm, ME 15×30)