In Search of Free Spaces to Breathe: Turkey's United June Movement,Social Uprising,and Spatial Maintainability

This study examines the socio-spatial practices of the United June Movement (UJM), a grassroots movement that drew inspiration from the neighbourhood forums of the Gezi Park protests. We argue that the counter-sites of politicisation and symbolic places engraved on the social movements’ memory formed the socio-spatial base of solidarity networks and the long-term political organising of UJM. Secondly, we suggest that in an authoritarian context, activist organisations nourishing from full-scale protests such as UJM need to form, reshape, and sustain free spaces where they feel protected. For testing these arguments, we designed fieldwork around UJM with an ethnographic approach. We concluded that the desire for social change has the potential of generating alternative visions in a spatiotemporal context, but in the medium term, it can turn into a feeling of self-enclosure or being besieged. Even so, such attempts leave a perpetual legacy, tagged to certain spaces and geographies.     

Soluble Salts Amplify the Effect of Small Heterogeneities in the Structure of Porous Building Materials During Drying

Salt crystallization is a major cause of degradation in old buildings. One of the issues that stills need clarification is regarding the influence of the salts on the capillary absorption and subsequent drying of porous building materials. This article presents an experimental study that included capillary absorption and evaporative drying tests on two types of material (lime mortar and ceramic brick) using pure water or saturated solutions of six salts (sodium chloride, sodium sulfate, sodium nitrate, sodium carbonate, potassium nitrate, or potassium carbonate). The results of capillary absorption agree only roughly with the linear relationship, predicted by theory, between sorptivity and the square root of the ratio between viscosity η and surface tension σ of the solution (σ/η)^1/2. This poor agreement is probably due to material heterogeneity. The drying dynamics was regular and showed little dispersion between specimens, but only for the uncontaminated materials. Indeed, the drying dynamics of the salt contaminated materials was often irregular or diverged among similar specimens, and the same happened with their salt decay patterns. The main conclusion is that soluble salts can amplify the effects on drying of the small structural heterogeneities that porous building materials normally depict.     

Design and Analysis of Cross Vaults Along History

The history of cross vaults began almost 2,000 years ago with a widespread use during the Middle Ages and Renaissance, becoming nowadays one of the most diffused and fascinating structural typologies of the European building cultural heritage. However, conversely to the undeniable excellence achieved by the ancient masons, the structural behavior of these elements is still at the center of the scientific debate. In this regard, with the aim of reviewing the knowledge on this subject as a concise and valuable support for researchers involved in conservation of historical buildings, with a focus on design rules and structural analysis, the present study firstly introduces the cross vaults from a historical perspective, by describing the evolution of the main geometrical shapes together with basic practical rules used to size them. Then, the article deals with the subsequent advancements in structural analysis methods of vaults, until the development of modern limit analysis.