Home·Lecture Master Ziggurat by Carles Gelpí. In July and August 2016 Carles Gelpí has given the lectures “Repairing and stabilization of slopes and bearing walls: initial considerations of pressure on rigid walls” at the International Master organized by Zigurat, ACE and IEE. Lecture Master Ziggurat by Carles Gelpí. In July and August 2016 Carles Gelpí has given the lectures “Repairing and stabilization of slopes and bearing walls: initial considerations of pressure on rigid walls” at the International Master organized by Zigurat, ACE and IEE.