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1
tesis de grado
The constant challenge of increasing quality in the manufacture of green building components and the lack of standards for the prediction of tensile strength is becoming a relevant challenge. For this reason, this research is focused on the development of a logarithmic function that relates the compressive and tensile strength of compressed earth bricks (CEB). To this purpose, the study examines the influence of different cement dosages (7%, 15% and 20%), drying days (7, 14, 21 and 28 days) and establishes critical correlations between tensile and compressive strengths. Key results indicate a proportional relationship between strength and cement dosage, with an optimal balance identified for maximum performance. A comparison was made between the proposed dosages, where the optimum was 20% cement at 28 days. In addition, a "significant positive" correlation coefficient of 0.77 is observed...
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Compressive strength and elasticity modulus are the main mechanical properties of concrete. The non-destructive ultrasound pulse test can be used to determine these properties without compromising the structure’s integrity. This study seeks to assess whether a correlation exists (1) between the Reinforcement Index (RI) and the mechanical properties, (2) between the RI and the dynamic properties, and (3) among the dynamic properties of polypropylene fiber-reinforced concrete. The RI was modified through fiber volume fraction (0, 0.4, 0.8 and 1.2%) and fiber length (40, 50 and 60 mm). The dynamic properties were assessed through dynamic elasticity modulus and ultrasonic pulse velocity (UPV), which were determined by direct, semi-direct, and indirect prospect methods. Finally, compressive strength, static elasticity modulus, and Poisson’s ratio were assessed through destructive tests. T...
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Cold joints represent concrete flaws resulting from different pouring times needed to complete a structural unit. The current investigation focuses on examining the reduction in compressive strength of concrete with cold joints at different pouring intervals through the development of an analytical model that describes the effectiveness of the use of two adhesion bridges to bond the new concrete to old concrete. To obtain the necessary data, compressive strength experimentation of concrete specimens with cold joints is carried out. The samples were manufactured under on-site conditions to ensure that the results presented faithfully reflect reality in construction projects in Lima, Peru. Furthermore, ANSYS is used to model the samples, which facilitates a more detailed analysis of their strength, and allows obtaining the friction coefficient of the interface zone as a function of the app...
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The building of modern housing concrete is a fundamental element that intervenes. On the other hand, in the construction of bridges, dams, tunnels, this is in the construction of non‐standard civil engineering structures, the concrete that is used is the high performance (CAR) that apart from the basic components such as water, Cement, fine and coarse aggregates, contain other cementing additives, such as microsílices. The problem is to get a technological resource that helps predict the resistance of CAR from its manufacturing data, but this is impossible. However, we have artificial neural networks that fulfill this role, which after being transformed into true mathematical functions that approximate the expected values ??of the resistance of concrete specimens. The approximation level is estimated by the correlation between the response and the expected value of the network. It is ...
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This paper involves a practical approach to perform quality-control/quality-assessment of concrete using vibration-based NDT. The first component is the analysis of compressive strength and dynamic E-modulus of concrete samples from various construction projects. The second component involves continuous measurements of E-Moduli as a function of curing time in laboratory-controlled specimens. The experimental program allowed proposing a correlation to predict the expected static and dynamic E-modulus at 28 days from their measurement at any instant of the curing process. A similar relationship is proposed to predict compressive strength at 28 days based on the dynamic E-modulus measured at earlier ages.
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  This article is referred to the design, construction and functioning of a Wind Tunnel opened, installed in the Energy Laboratory of the Mechanical Engineering Faculty, Universidad Nacional de Ingeniería, FIM-UNI, it used to research and experimental tests of wind generator models, testing circuit performing evaluations to improve the system of orientation, safety of turbine and permanent magnet generator optimization. This tunnel was installed in July 2008, by specific action of agreement between the Mechanical Engineering Faculty, FIM-UNI and SOLUCIONES PRÁCTICAS-ITDG, as part of the joint research in the development and optimization of small wind turbines for the electrification of isolated Peruvian rural populations. Tunnel basically consists of three parts: collector, stagnation chamber and diffuser; calculations were made using compressible flow equations. As a result of ap...
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  This article is referred to the design, construction and functioning of a Wind Tunnel opened, installed in the Energy Laboratory of the Mechanical Engineering Faculty, Universidad Nacional de Ingeniería, FIM-UNI, it used to research and experimental tests of wind generator models, testing circuit performing evaluations to improve the system of orientation, safety of turbine and permanent magnet generator optimization. This tunnel was installed in July 2008, by specific action of agreement between the Mechanical Engineering Faculty, FIM-UNI and SOLUCIONES PRÁCTICAS-ITDG, as part of the joint research in the development and optimization of small wind turbines for the electrification of isolated Peruvian rural populations. Tunnel basically consists of three parts: collector, stagnation chamber and diffuser; calculations were made using compressible flow equations. As a result of ap...
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The high performance concrete is a relatively recent material and its use dates of final of the 60’s. However, countless advantages make it to be used more and more in the construction. Its manufacturing comes from the standard concrete to which a series of additives as microsílica or cementitious are added. These additives confer the concrete some better benefits regarding the standard concrete as an increase of the near resistance up to 100%. The mechanical properties of this concrete newly are being studied in detail and at the moment there are not many studies about the influence of the additives in the resistance, formulation optimizations or the evolution of the resistance to compression with the time of curing. Over all the mechanical properties of the concrete, the resistance to compression after 28 days of curing is the most used one in control of quality. In this study the i...
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tesis de grado
Este trabajo determina la influencia de la adición de Sika Fiber Force - 48, estudia la correlación entre el módulo de rotura y la resistencia a la compresión del concreto cemento - arena de f’c=280 kg/cm2, elaborado con agregado fino de 1.97 de módulo de fineza de la región. La investigación es de tipo cuali-cuantitativa; de nivel descriptivo y explicativo; de diseño cuasi experimental. La muestra estuvo conformada por 132 probetas, de las cuales 33 pertenecen a la muestra patrón y 99 a la muestra de diseño experimental con relaciones A/C = 0.47, 0.52 y 0.58 y cuatro diferentes dosificaciones de macrofibra iguales a 0.00 kg/m3, 0.20kg/m3, 0.35kg/m3 y 0.50kg/m3, las que fueron evaluadas a los 7 y 28 días de curado. En el proceso, se determinó también la influencia de esta macrofibra, en la consistencia en el estado fresco del concreto cemento-arena y las propiedades mecán...
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Biomorphic SiC/Si compounds were fabricated from copaiba wood (Copaifera officinalis, natural wood native to Peru), by reactive infiltration of molten silicon in a porous carbon preform obtained by a controlled pyrolysis process of wood. Structural and microstructural characterization tests by X-ray diffraction and scanning electron microscopy, respectively, revealed, on the one hand, the presence of crystalline phases of SiC, Si and C, and on the other, the typical morphology of this type of material, which it consists of a continuous SiC scaffold with elongated channels in the direction of tree growth and the presence of residual Si and C located mainly in the porosities of the material. The mechanical behavior in uniaxial compression was also studied at a constant compression rate of 0.05 mm/min and as a function of temperature (from ambient to 1400 ºC) and test atmosphere (ambient a...
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The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: J.C.-V. thanks to Circulo de Investigacion e Innovacion de Materiales Avanzados para la Industria y Biomedicina of FONDECYT (CONCYTEC) under grant No 011-2014-FONDECYT, and to the Brazilian Society of Physics (PLAF program) that financed part of this work. C. V.L., J.Q.-M. and V.P.R. are grateful to FONDECYT (CONCYTEC) for financial support through the Excellence Center Program.
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La presente tesis se enmarca en la ciudad de Cusco, la investigación tiene por objetivo evaluar las propiedades físico-mecánicas de la madera Eucalipto Globulus de la zona de Paruro-Cusco en dos contenidos de humedad, los cuales fueron natural y seco. Las propiedades físico-mecánicas que se ensayaron fueron: Densidad básica, Cizallamiento paralelo al grano, Compresión axial o paralela al grano, Compresión perpendicular y Flexión estática, para lo cual se utilizó un total de 200 probetas elaboradas de 5 árboles extraídos de la zona de Paruro-Cusco, se utilizaron 20 probetas por ensayado dando un total de 100 probetas por contenido de humedad seco y 100 probetas por contenido de humedad natural. Las dimensiones de cada probeta se realizaron de acuerdo a lo estipulado en las Normas Técnicas Peruanas, y se verifico que estuvieran libres de defectos antes de cada ensayo, los por...
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La presente tesis se enmarca en la ciudad de Cusco, la investigación fue orientada al estudio de las propiedades de compresión y tracción de muestras de concreto f’c=210 kg/cm2 sustituyendo en porcentajes de peso (0.25%,0.50% y 1.00%) del agregado grueso con fibras de Nylon (hilo macramé) numero clave 18 a longitudes de 3cm y 5cm, la mezcla de concreto se fabricó con Agregado Grueso de Vicho (100%), Arena Fina de Cunyac (30%), Arena Fina de Mina Roja (70%) y Cemento Portland tipo IP, los ensayos fueron realizados a edades de 7 y 28 días. En la etapa procedimental de la investigación se realizó los respectivos ensayos tanto a los agregados como a la fibra que se utilizó, concluyendo que los materiales cumplen con los requerimientos de las normas garantizando así su buena calidad para su posterior uso. Luego se continuó con el diseño de mezclas en base a la metodología tradi...
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La presente tesis se llevó a cabo en la ciudad de Trujillo, departamento de La Libertad. El fin de esta investigación fue hacer mejoras en las propiedades físicas y mecánicas del concreto como la resistencia a la compresión, tiempo de fraguado y asentamiento, ya que actualmente el auge constructivo a nivel mundial trae nuevos retos y problemas que solucionar. Para lograr el objetivo de la presente investigación se dispuso adicionar al concreto, aditivos ASTM C494 tipo B, ya que estos aditivos cumplen la función de retardantes de fragua. La tesis se justificó, debido a la demanda de compensar los efectos de aceleramiento de fraguado y a la vez obtener mayor resistencia a la compresión, obteniendo también mayor trabajabilidad sin variación significativa del costo de producción del concreto. Esta tesis es netamente una investigación experimental, ya que se tuvo que observar en ...
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tesis de grado
La presente tesis se enmarca en la ciudad de Cusco, la investigación tiene por objetivo evaluar la variación de las propiedades físico - mecánicas de la madera Miza de la zona de Puerto Maldonado, en comparación con la madera Miza de las zonas de Camanti y Kosñipata según NTP E.0.10. Las propiedades físico-mecánicas que se ensayaron fueron: Contenido De Humedad, Densidad básica, Cizallamiento paralelo al grano, Compresión axial o paralela al grano, Compresión perpendicular, Flexión estática y Dureza Brinell, para lo cual se utilizó un total de 432 probetas elaboradas de 5 árboles según la NTP 251.008 de las zonas de Puerto Maldonado, Camanti y Kosñipata, siendo utilizadas para cada ensayo un total de 24 probetas por grupo de evaluación. Las dimensiones de cada probeta se realizaron de acuerdo a lo estipulado en las Normas Técnicas Peruanas, y se verifico que estuviera...
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La presente tesis se enmarca en la ciudad de Cusco, la investigación tiene por objetivo evaluar los efectos que producen el aceite requemado automotriz y la cola sintética blanca en las propiedades físico mecánicas de la madera Eucalipto Globulus con contenido de humedad seco procedente de Paucartambo – Cusco aplicada por inmersión prolongada para uso estructural. Las propiedades físico-mecánicas que se ensayaron fueron: Densidad básica, Dureza, Cizallamiento paralelo al grano, Compresión axial o paralela al grano, Compresión perpendicular y Flexión estática, para lo cual se utilizó un total de 360 probetas elaboradas de 5 árboles extraídos de la zona de Paucartambo, se utilizaron 20 probetas por ensayo dando un total de 120 probetas por tratamiento con cola sintética blanca, 120 con tratamiento de aceite requemado automotriz y 120 probetas sin tratamiento. Se utilizó ...
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This work has been funded by the 055-2020-FONDECYT GRANT from the Peruvian government and the donations of the enterprises mentioned in our webpage: https://www.proyectomasi.pe/.In addition,the authors would like to thank to all the members of the Masi team, especially to all of the collaborators working at the five institutions involved in this project (BREIN, DIACSA, EAT, PUCP and Zolid). Without all of their effort, professionalism and sacrifice while working steadily during the pandemic; this device would have not existed.
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La investigación denominada; Evaluación comparativa de la influencia de diferentes espesores de junta de mortero de tres diferentes calidades, en muretes de albañilería sometidos a compresión diagonal, elaborados con ladrillo King Kong 18 huecos de la zona de San Jerónimo – Cusco; buscó analizar la variación de la resistencia a la compresión diagonal de muretes elaborados con ladrillo King Kong 18 en función del espesor de junta, propiedades físico mecánicas de los morteros y las propiedades físico mecánicas de la unidad de albañilería evaluados a los 28 días. Se elaboró muretes de 0.60 x 0.60m, conformado por el ladrillo 18 huecos King Kong (de fabricación zonal) y un mortero de elaboración Artesanal, Normado e Industrial. Para juntas de mortero que varían de 1.50, 2.00 a 2.50 cm. La dosificación del mortero Artesanal obedeció a una investigación previa desarro...
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El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.
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At the Small Animal Clinic of the University of Amazonia, a female crossbreed feline arrives with a right pelvic limb neuromotor disorder, alteration of behavior and urinary and fecal incontinence. The tests performed showed kidney infection and Mycoplasma spp., A ventro-dorsal radiography of the lumbosacral region showed bilateral sacral-iliac dislocation, and consequent compression of the nerve roots of the vertebral canal, compatible with cauda equina syndrome. The implementation of a therapeutic protocol with 1% plus Neuralgo® and Inmul-V® (neural therapy), with applications of 0.1 ml in each intervertebral space and the femoral nerve of the affected limb, Cannabis sativa as an analgesic and physical therapies recovery of member functionality almost 100% in three weeks. This protocol reduced the recovery time and the presentation of side effects in the patient.