The slabs of some buildings in Barcelona are formed by unidirectional beams. with a ceramic arch in between. which are filled with broken pottery or construction waste. These structures often present problems such as displacement of the tiles arranged over it due to the lack of stiffness of the filling material. https://www.roneverhart.com/Tiny-Chicle-Squares-Chewing-Gum-Pink-1-5LB-Jar/