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Mechanical characterization of adobe masonry
(Springer Nature, 2021-01-01)
The characterization of the mechanical properties and behaviour of adobe masonry is fundamental for the understanding of the structural behaviour of adobe constructions. Thus, in the last decades, experimental studies focused on this topic have been carried out by different authors. Many of the existing experimental works, however, were carried out aiming to support broader studies focused on the seismic behaviour of adobe constructions and are not very detailed. Moreover, authors tend to adopt different procedures in their experimental work, since there are few indications in existing standards for testing adobe masonry. The wide variety in materials used, both for the adobes and mortars, further complicates this work, making it difficult to compare results obtained in different studies. This chapter provides an overview of the indications given by standards and other technical recommendations for the mechanical testing of adobe masonry. It presents a review of existing research on the mechanical behaviour of adobe masonry, addressing studies that focus on: (i) compression behaviour, (ii) shear behaviour, (iii) joint shear behaviour. It provides a global analysis of the existing knowledge, suggesting improvements for normative documents and identifying future research needs.
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Mechanical characterization of adobe bricks
(Springer Nature, 2021-01-01)
The mechanical characterization of adobe bricks is an important first step in the study of the behaviour of adobe masonry. For this reason, in the last decades, different authors have conducted research on the mechanical behaviour of adobes from various regions of the world. Despite the importance of mechanical characterization, there are still only a few standards and normative documents with clear indications for the mechanical testing of earthen materials and, in general, these indications are not thorough and vary among different countries. Consequently, authors tend to adopt different types of test specimens and procedures in their experimental work, thus obtaining results that are not directly comparable. The fact that the materials and procedures traditionally used are also not standardized, varying greatly from region to region, also contributes to the difficulty of comparing results from different studies. This chapter presents a review of the indications provided by codes, standards and other technical recommendations for the mechanical testing of adobe bricks, as well as a detailed review of procedures adopted, and results obtained by different authors regarding the mechanical characterization of traditional adobe bricks. This chapter focuses, in particular, on the behaviour of adobe bricks when subjected to simple compression. It provides an overview of the existing knowledge and identifies needs for future research and development.
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The politics of accountability in global sustainable commodity governance: Dilemmas of institutional competition and convergence
(John Wiley and Sons Inc, 2024-11-01)
The accountability of market-driven sustainability governance has long been controversial, reflecting the deeply political processes through which accountability contests shape governance transformations. Drawing on illustrative examples from internationally traded agro-commodity sectors in the critical case of Indonesia, this paper examines the contested processes of accountability that have accompanied a recent period of institutional change in sustainability governance. Amidst rising critiques of global certification, there has been a parallel expansion of governance approaches that prioritise capability development over regulatory enforcement and engage more intensively with governments in commodity-producing countries. As alternative governance models gain influence, tensions between competing governance stakeholders and agendas are mirrored and amplified through parallel accountability contests, in which distributional conflicts between global and local stakeholders are intensified by pressures to adopt contentious systems of compliance verification. While accountability gaps associated with contrasting institutional models produce strong pressures for partial institutional convergence, such convergence coexists with new forms of institutional fragmentation, as competition between global and national certification expands to encompass competition with localised capacity-building and jurisdictional approaches. Analysis highlights the often-neglected role of accountability politics in shaping institutional change, while raising pressing questions about the distributional implications of contemporary shifts away from global certification governance models.

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