PSI - Issue 33

Fabrizio Pittau et al. / Procedia Structural Integrity 33 (2021) 630–645 Author name / Structural Integrity Procedia 00 (2019) 000–000

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Polyurea - A

Mineral coating - B

Epoxy-primer - C

Epoxy-cementitious - D

(a) (d) Fig. 6. Front view of the mock-up coated with different technology: (a) Polyurea, (b) Mineral coating, (c) epoxy primer, (d) epoxy cementitious. (b) (c)

3.1. Specimen A – Polyurea

3.1.1. Type of Coating Specimen A (Fig. 7, Fig. 8) was coated with the following layers of material:  regularization with three-component cementitious mortar;  two-component epoxy primer enriched with siliceous sand;  two-component waterproofing membrane based on pure polyurea.

The epoxy-cement mortar was used to regularize the specimen surfaces and provide a first barrier impermeable to water but not to steam. The regularization has allowed the filling of the pores of the concrete surface necessary for the application of two-component epoxy primers. The last layer is a liquid layer based on polyurea, waterproof and sufficiently elastic. Thanks to its elasticity it allows the small motions of the structure. The product is mainly for roofs waterproofing, but also as protection of concrete structures and water retention structures.

Fig. 7. levelling with epoxy-cement mortar