PIMASW

PIMASW investigates a thin, non‑invasive polyurea‑based coating designed to enhance the seismic performance of brittle masonry shear walls. The project focuses on determining how a lightweight polymer layer—sprayed on both faces of the wall—can improve lateral strength, deformation capacity, and overall energy dissipation without altering the geometry or requiring intrusive construction techniques.

The experimental campaign consists of quasi‑static in‑plane cyclic tests performed on masonry shear walls first in their as‑built condition, and then after the application of the polyurea coating. By testing the same wall before and after strengthening, the project provides a direct and reliable assessment of the coating’s ability to mitigate cracking, delay strength degradation, and increase ductility in traditionally brittle masonry systems.

Social Impact

Many communities—especially in historic centers and seismic regions—rely on masonry buildings that are vulnerable to earthquake damage and difficult to retrofit using traditional methods. PIMASW offers a non‑intrusive solution that enhances safety while preserving architectural identity. By enabling fast strengthening and reducing the need for invasive construction, the project supports greater seismic resilience, faster post‑event recovery, and long‑term protection of cultural heritage. Its emphasis on simplicity and accessibility makes it a promising tool for improving community safety in regions where resources, time, or building constraints limit conventional interventions.

Ultimately, PIMASW contributes to a future where seismic protection is efficient, unobtrusive, and compatible with the realities of existing masonry structures.

Practical Implications

PIMASW aims to deliver a rapid, minimally disruptive, and cost‑effective strengthening method for existing masonry buildings. Polyurea coatings can be applied quickly, require no heavy equipment, and add negligible weight to the structure. Their thin profile makes them ideal for buildings where architectural preservation, interior usability, or limited access prevent conventional retrofitting approaches. The technique is highly adaptable, suitable for both emergency post‑earthquake repairs and planned seismic upgrades.

Unreinforced condition

Reinforced condition