Browsing by Autor "Walter Antonio Abujder Ochoa"

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An Application of the RegCM4 System to Quantify the Effects of Climate Change on the Hydric Potential of the Angostura-Bolivia Basin
(Multidisciplinary Digital Publishing Institute, 2024) Michael Diego Lizarazu Rojas; Walter Antonio Abujder Ochoa; Luis E. Montenegro Terrazas; Marko Andrade Uzieda; Oriana Palma Calabokis; Yamid E. Núñez de la Rosa; Jorge E. Nava Sejas
Climate change (CC) impacts on hydrology pose significant global concerns due to their effects on water availability, thereby impacting various human activities reliant on this essential resource. This study assesses the influence of CC on the water supply in the Angostura-Bolivia basin. We employed the RegCM4 system, which develops its own regional climate models (RCMs) tailored to the Angostura basin using specific convective schemes, diverging from reliance on pre-existing RCMs, like those provided by CORDEX. Methodologically, the study involves hydrometeorological data collection and analysis, utilizing dynamic and statistical downscaling methods to refine the RCMs derived from ERA-Interim reanalysis data. Subsequently, precipitation and temperature projections are generated under CC scenarios (RCP 4.5 and RCP 8.5) for both near (2045–2055) and far (2065–2075) future periods, compared to the historical period (1981–2010). The final stage employs the HydroBID system to project future runoff, considering both perturbed and unperturbed hydrometeorological data under CC effects. The analysis of flow duration curves for 50%, 75%, and 90% exceedance probabilities reveals a significant reduction in flows across all scenarios, indicating a noteworthy impact on water availability. These findings underscore the urgency of comprehending and adapting to CC on hydrology, emphasizing the critical importance of sustainable water resource management amidst evolving climatic conditions.
Evaluación de la influencia de cementos portland tipo IP y aditivos superplastificantes en la elaboración de hormigones de alta resistencia en la ciudad de Cochabamba, Bolivia
(Brazilian Journal of Development, 2022) Gunther Eduardo Viscarra Chirinos; Walter Antonio Abujder Ochoa
El hormigón de alta resistencia es el material producto de la mezcla de cemento, agregados de alta calidad, aditivos especiales y adiciones cementicias, que al mezclarse y ensayarse a compresión mediante probetas normalizadas permitan obtener resistencias mayores a los 50 MPa (500 Kg/cm2). El presente estudio tiene como objetivo evaluar la influencia de cementos portland tipo IP y aditivos superplastificantes en la elaboración de hormigones de alta resistencia eb la ciudad de Cochabamba, Bolivia. En ese sentido, se realizaron 2 pruebas, la primera para determinar el rango óptimo de utilización del microsilice y la segunda se realizó en base a los resultados de la prueba 1, en esta prueba se aplicaron los rangos óptimos de microsilice obtenidos. En ambos casos se observó que para mayor cantidad de cemento en trazo 1:2 el comportamiento del microsilice no es favorable ya que no existe el mismo comportamiento que cuando se tiene un trazo más diverso en agregados.
Evaluation of Compressive and Bending Strength of a Geopolymer Based on Lateritic Clays as an Alternative Hydraulic Binder
(Multidisciplinary Digital Publishing Institute, 2024) Walter Antonio Abujder Ochoa; Moisés Alejandro Sánchez Málaga; Arturo Tapia; Oriana Palma Calabokis; Yamid E. Núñez de la Rosa; Gunther Viscarra Chirinos; Sebastián Pinto Lavayén
In Bolivia, lateritic soils are common in humid tropical regions and can be used in the construction industry as an alternative to materials that cause a negative environmental impact, such as cement. The production of Portland cement causes environmental issues like significant greenhouse gas emissions and air pollution. To address this problem, geopolymers have been introduced as an alternative binder with low CO<sub>2</sub> emissions. In this regard, geopolymers based on lateritic clays have been studied mineralogically, chemically, and on their compressive strength separately. However, there are still no studies on lateritic clays present in Bolivia and their mechanical, mineralogical, and chemical properties combined in a geopolymer. Therefore, this present research proposes the evaluation of a geopolymer made from laterite clays. Compression and flexural tests were carried out, along with mineralogical and chemical analyses on mortar and geopolymer cubes and prisms. The results indicate that the laterite clay-based geopolymer has lower compressive strength compared to Portland cement IP (cement type I with the addition of pozzolana) mortar. However, the flexural strength tests show a slight increase in the case of the geopolymer.
Interlinking Urban Sustainability, Circular Economy and Complexity: A Systematic Literature Review
(Multidisciplinary Digital Publishing Institute, 2025) Walter Antonio Abujder Ochoa; Angela Gabriela Torrico Arce; Alfredo Iarozinski Neto; Mayara Regina Munaro; Oriana Palma Calabokis; Vladimir Ballesteros Ballesteros
Urban sustainability challenges demand integrated frameworks capable of addressing the dynamic, non-linear nature of cities. This study explores how the principles of the circular economy and complexity theory intersect to support systemic transformation in sustainable urban planning. Through a systematic literature review of 71 peer-reviewed articles published between 2015 and 2025, we analyze conceptual, methodological, and practical articulations across multiple thematic axes, including circular governance, urban metabolism, regenerative design, adaptive planning, digital integration, and environmental justice. Bibliometric and content analyses were conducted using Scopus metadata, VOSviewer for thematic clustering, and the StArt software (Version 3.4) to structure article selection. The findings reveal that circular economy provides practical tools for resource efficiency and regeneration, while complexity theory offers an adaptive framework to navigate uncertainty, emergent behaviors, and feedback dynamics. The synthesis suggests that their integration enables a more holistic and resilient approach to urban transformation. However, gaps remain in social inclusivity, long-term assessment, and the operationalization of complexity-informed planning. This study contributes to advancing a transdisciplinary agenda for circular and adaptive urban futures, offering insights for scholars, planners, and policymakers aiming to reconfigure cities within planetary boundaries.
Soil-Structure Interaction, A Case Study of a Building in Cochabamba, Bolivia
(Springer Nature, 2024) Moisés Alejandro Sánchez Málaga; Walter Antonio Abujder Ochoa
The theory of complexity and construction management: An analysis of perception and impact on the construction industry in Brazil and Bolivia
(EDP Sciences, 2024) Walter Antonio Abujder Ochoa; Moisés Alejandro Sánchez Málaga; Michael Diego Lizarazu Rojas; Angela Gabriela Torrico Arce; Alfredo Iarozinski Neto
The theory of complexity derived from systems theory emphasizes complex systems and their dynamic interactions with their environment. In this sense, in project management, this theory offers invaluable perspectives, where systems involve diverse components working towards a common objective. The construction sector is facing challenges in managing project complexity, and effective strategies are required to ensure success. While projects are often perceived as predictable, the reality of construction complexity demands a shift in perspective. Currently, the linear view of construction processes is being challenged, advocating for recognizing projects as nonlinear and dynamic phenomena. This study aims to explore the application of complexity theory in construction project management, focusing on differences in complexity perception between Cochabamba and the Metropolitan Region of Curitiba. Discriminant Analysis does not reveal a significant disparity in complexity perception between the two regions, with variables such as uncertainty about the subsoil having the most influence on complexity perception.