I am trying to find any good paper about hollow concrete blocks reinforced with micro polypropylene fibers for masonry applications. Hopefully, development and mechanical-damage testing of the blocks and/or performance of shear walls constructed with these blocks. I found a very good paper addressing hollow concrete blocks, but reinforced with Sisal (Soto-Izquierdo et al. (2017). Sisal fiber reinforced hollow concrete blocks for structural applications: Testing and modeling).