Browsing by Autor "Marialaura Herrera Rosas"

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Analysis of concrete mechanical properties when adding type-E glass fibers
(Springer Science+Business Media, 2023) Marialaura Herrera Rosas; Nahúm Gamalier Cayo Chileno; Alejandra Araoz Campos; Joaquín Humberto Aquino Rocha
Bloques prensados de suelo-cemento como alternativa ecológica frente a los ladrillos tradicionales de arcilla cocida
(2019) Joaquín Humberto Aquino Rocha; Nataly Andrea Zapata Ampuero; Marialaura Herrera Rosas; Willam Murillo Borda; Giovanni Galindo Añez
La producción de ladrillos de arcilla cocida de forma artesanal todavía es realizada y ampliamente extendida, especialmente en países en vías de desarrollo; sin embargo, esta práctica consume varios recursos naturales y genera emisiones dióxido de carbono (CO), afectando negativamente al medio ambiente y la comunidad. En este sentido, el objetivo del presente estudio es evaluar las características de los bloques de suelo-cemento como una alternativa ecológica, comparándolos con los ladrillos tradicionales de arcilla cocida. Para tal motivo, se fabricaron un total de 105 bloques de suelo-cemento con diferentes contenidos de cemento (2%, 4%, 6%, 8% y 10%), lo cuales fueron sometidos a diferentes ensayos: resistencia a la compresión, absorción y durabilidad. Los resultados muestran que los bloques con 8% y 10% de cemento presentan las mejores características e incluso pueden ser utilizados para construcciones a partir de los 7 días desde su fabricación; no obstante, los bloques de 4% y 6% de cemento también pueden ser utilizados, pero a partir de los 28 días, tiempo donde desarrollan las características recomendadas.
Comparative Evaluation of Grids for the Detection of Internal Defects in Concrete Using Ultrasonic Pulse Velocity: Experimental Approach
(American Society of Civil Engineers, 2025) Joaquín Humberto Aquino Rocha; Willam Murillo Borda; Marialaura Herrera Rosas; Nahúm Gamalier Cayo Chileno
This study evaluates the efficacy of ultrasonic pulse velocity (UPV) testing in detecting internal defects in concrete through an experimental comparison of various measurement grid configurations and concrete compressive strengths. Concrete blocks measuring 60×60×20 cm were fabricated with simulated internal defects created using polystyrene plates. UPV testing was performed in direct transmission mode to identify and quantify defective areas. Measurement grids with densities of 2.5×2.5 cm, 5×5 cm, and 10×10 cm were utilized, and three compressive strength levels were analyzed: 21 MPa (C21), 25 MPa (C25), and 30 MPa (C30). The findings reveal that the 2.5×2.5 cm grid is the most effective for detecting defects, offering an accurate differentiation of internal variations within the concrete, particularly in higher-strength mixtures. In contrast, less dense grids exhibited greater variability in measurements and reduced sensitivity to smaller defects (6.25 cm2). The selection of grid density should carefully balance the need for precision with practical constraints, such as time and resources. Complementing UPV testing with other nondestructive testing (NDT) methods is recommended to achieve a more comprehensive evaluation of concrete integrity.
Compressive Strength Assessment of Soil–Cement Blocks Incorporated with Waste Tire Steel Fiber
(Multidisciplinary Digital Publishing Institute, 2022) Joaquín Humberto Aquino Rocha; Fernando Palacios Galarza; Nahúm Gamalier Cayo Chileno; Marialaura Herrera Rosas; Sheyla Perez Peñaranda; Luis Ledezma Diaz; Rodrigo Pari Abasto
The rapid growth in waste tire disposal has become a severe environmental concern in recent decades. Recycling rubber and steel fibers from wasted tires as construction materials helps counteract this imminent environmental crisis, mainly improving the performance of cement-based materials. Consequently, the present article aims to evaluate the potential use of waste tire steel fibers (i.e., WTSF) incorporated in the manufacture of soil-cement blocks, considering their compressive resistance as a primary output variable of comparison. The experimental methodology applied in this study comprised the elaboration of threefold mixtures of soil-cement blocks, all of them with 10% by weight in Portland cement, but with different volumetric additions of WTSF (i.e., 0%, 0.75%, and 1.5%). The assessment's outcomes revealed that the addition of 0.75% WTSF does not have a statistically significant influence on the compressive resistance of the samples. On the contrary, specimens with 1.5% WTSF displayed a 20% increase (on average) in their compressive strength. All the tested samples' results exhibited good agreement with the minimum requirements of the different standards considered. The compressive resistance was evaluated in the first place because it is the primary provision demanded by the specifications for applying soil-cement materials in building constructions. However, further research on the physical and mechanical properties of WTSF soil-cement blocks is compulsory; an assessment of the durability of soil-cement blocks with WTSF should also be carried out.
Implementación de conceptos y herramientas de la filosofía Lean Construction en las empresas constructoras de la Ciudad de Cochabamba – Bolivia
(Libre University of Colombia, 2022) Rodrigo Vergara Hinojosa; Nahúm Gamalier Cayo Chileno; Marialaura Herrera Rosas; Alejandra Araoz Campos; Joaquín Humberto Aquino Rocha
The objective of this study is to identify the strategies used by the construction companies of the city of Cochabamba-Bolivia in the execution of projects, considering the tools and concepts of Lean Construction. The methodology consisted of a survey of 63 companies in the city of Cochabamba-Bolivia through a questionnaire made up of 44 questions. Four aspects were consulted: a) profile of project managers, b) general company information, c) planning and execution of projects and d) knowledge of the Lean Construction philosophy. The results show that companies recognize the problems in productivity and generation of waste, but do not carry out specific solutions. On the other hand, companies have listened to and even implemented some Lean Construction tools; however, the majority (70%) do not know the philosophy. Although barriers to implementing the philosophy are identified, actions that can collaborate in its application are also highlighted, such as demonstrating results with benefits and training staff
Physical-mechanical assessment for soil-cement blocks including rice husk ash
(Elsevier BV, 2021) Joaquín Humberto Aquino Rocha; Marialaura Herrera Rosas; Nahúm Gamalier Cayo Chileno; Giovana Silvia Cachaca-Tapia
Resistência à compressão e absorção de blocos de solo-cimento com resíduos de PET
(2025) Bianka Sueldo Alvarez; Marialaura Herrera Rosas; Nahúm Gamalier Cayo Chileno; Joaquín Humberto Aquino Rocha
A incorporação de resíduos na construção civil é uma alternativa promissora para reduzir impactos ambientais e promover a economia circular. Neste estudo, avaliou-se o efeito da adição de PET reciclado (0,5%, 1,0% e 1,5% em volume) nas propriedades mecânicas e físicas de blocos de solo-cimento. Foram analisadas a resistência à compressão e a absorção de água. Os resultados mostraram que a incorporação de 1,0% e 1,5% de PET aumentou moderadamente a resistência à compressão, devido à sua capacidade de restringir a propagação de fissuras. Além disso, observou-se uma redução significativa na absorção de água, associada à natureza hidrofóbica do PET, que melhora a compactação da matriz. No entanto, teores elevados podem comprometer a uniformidade do material. Os resultados indicam que o uso de PET reciclado pode ser uma alternativa sustentável para a produção de blocos de solo-cimento, contribuindo para a reutilização de resíduos plásticos na construção civil.
Surface biomineralization with Pythium aphanidermatum in cracked cement pastes: Limitations and perspectives
(Federal University of Rio de Janeiro, 2026) Nahum Gamalier Cayo Chileno; Daniela Sales Alviano; Giovanni Añez Galindo; Marialaura Herrera Rosas; Otávio da Fonseca Martins Gomes; Fernando Henrique Guimarães Rezende; Laércio Mesquita Júnior; Gabrielle Avelar Silva; M. M. Ferreira; Saulo Rocha Ferreira
ABSTRACT This study investigates the limitations of biomineralization for the surface treatment of cracks in cement pastes. The proposed strategy involves the application of Pythium aphanidermatum spores on pre-carbonated cement matrices with induced cracks. The pastes were reinforced with polypropylene fibers, cracked via diametral compression, and subsequently subjected to a controlled carbonation process. Three treatment conditions were evaluated: water (Ref) and two biological solutions (T1 and T2) containing calcium acetate, Potato Dextrose Broth (PDB), and Pythium spores; T2 also included urea as an additional nutrient source. Treatment performance was assessed through load recovery and crack width closure. Additionally, SEM analysis was performed to detect microbial colonization along crack surfaces. The results showed limited mechanical improvement, with slightly better performance in T1 and T2. However, no measurable crack width healing (CWH ≈ 0%) was detected, and no microbial growth was observed, likely due to high alkalinity, low surface porosity, and poor nutrient retention in the treated zone. Despite the modest outcomes, the study introduces an innovative approach that combines accelerated carbonation and surface biomineralization using a non-bacterial microorganism. For future studies, it is recommended to investigate multiple treatment applications, encapsulation systems for spore delivery, surface modification to enhance microbial adhesion, and local pH monitoring to ensure optimal conditions for microbial growth and activity.
The Utilization of Unmanned Aerial Vehicles (UAVs) in Cultural Heritage Buildings: A Systematic Literature Review
(Springer Science+Business Media, 2024) Joaquín Humberto Aquino Rocha; Roger Joel Rios Gonzales; Natalia Cecilia Revollar Castro; Marialaura Herrera Rosas; Alejandra Araoz Campos; Nahúm Gamalier Cayo Chileno; Alberto Casado Lordsleem Júnior
Thermal and economic assessment of steel slag masonry in social housing under climate change scenarios
(Springer Science+Business Media, 2025) Karina Marcele Marques; Marialaura Herrera Rosas; Joaquin Humberto Aquino Rocha; Nahúm Gamalier Cayo Chileno; Ricardo André Fiorotti Peixoto