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1
tesis de grado
Publicado 2024
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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...
2
artículo
Publicado 2017
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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 ...
3
artículo
Publicado 2017
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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 ...
4
artículo
Publicado 2022
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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...
5
artículo
Publicado 2024
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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...
6
artículo
Publicado 2018
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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...
7
artículo
Publicado 2016
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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.
8
tesis de grado
Publicado 2025
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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...
9
tesis de grado
Publicado 2025
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Polyethylene terephthalate (PET) is a widely used material in container manufacturing, particularly in bottle production. It is characterized by its low cost and widespread availability. However, its improper disposal has significantly exacerbated global plastic pollution. For instance, less than 50% of plastic bottles are recycled. Moreover, studies indicate that this issue has led to a significant accumulation of plastic waste in the oceans, which continues to grow annually and could be considered floating islands of debris. This study proposes replacing PET with polylactic acid (PLA), a biodegradable and biocompatible polymer with suitable properties for bottle production. PLA also has a shorter decomposition time compared to PET, contributing to the reduction of carbon footprint and greenhouse gas emissions. The research methodology included a diagnostic phase to define objectives, i...
10
artículo
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.
11
tesis de grado
Publicado 2018
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En el presente trabajo de investigación se estudió el comportamiento del concreto permeable al adicionarle tres dosificaciones de fibra de vidrio. Se evaluó la permeabilidad y resistencia a compresión del concreto permeable con tres porcentajes de fibra de vidrio adicionada. Se realizó el diseño de mezcla del concreto permeable con 15% de vacíos según la norma ACI 211.3R - 02, se evaluaron cuatro muestras en total, se establecieron tres tratamientos de fibra de vidrio (0.05%, 0.10% y 0.15%) más un patrón (0.00% de fibra de vidrio), para los ensayos a compresión axial se elaboraron 18 probetas por cada muestra las cuales fueron ensayadas a los 7, 14 y 28 días de curado según la norma ASTM C 39, ensayando un total de 72 probetas, para el ensayo de infiltración del concreto se elaboraron 3 paneles por cada muestra para ser ensayadas según la norma ASTM C 1701. Los resultados ...
12
tesis de grado
Publicado 2015
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En la presente tesis de investigación se tiene como objetivo principal determinar la relación de la resistencia a la compresión de cilindros de concreto a edades de 3, 7, 14, 28 y 56 días respecto a la resistencia a la compresión de cilindros de concreto a edad de 28 días, logrando expresar mediante una ecuación el comportamiento del concreto en su etapa de fraguado. Para llegar a cumplir con este objetivo, se tomó como material de esta investigación las probetas cilíndricas, cuyas dimensiones son de 15 cm. x 30 cm. Se llevó a cabo la mezcla de los concreto utilizando 3 tipos de cementos comercializados en el medio (cementos Pacasmayo): Cemento portland Tipo Ico, Cemento portland Tipo V y Cemento portland Tipo Ms. Se efectuó tres (3) muestras de probetas o testigos de concreto a diferentes relaciones de agua- cemento en las cuales se ensayaron a las edades de 3, 7, 14, 28 y 5...
13
tesis de grado
Publicado 2021
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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 ...
14
artículo
Publicado 2020
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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.
15
artículo
Publicado 2021
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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.
16
artículo
Publicado 2024
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Photoluminescence is revolutionizing construction, especially in concrete pavements and structures, by offering both aesthetic and functional improvements. Photoluminescent pigments, which store and emit light, can positively influence the physical-mechanical properties of concrete. This study examines pigments such as strontium aluminate, zinc silicate, zinc phosphate and calcium fluorescence, evaluating their emission life and their impact on the compressive strength and durability of concrete. Photoluminescent pigments absorb light energy and release it in the form of visible light, providing prolonged luminescence. Strontium aluminate stands out for its high intensity and durability, significantly improving the compressive strength of concrete. Zinc phosphate also offers long emission and is highly resistant to moisture. Zinc silicate improves wear resistance, while calcium fluoresce...
17
tesis de grado
Publicado 2024
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Un problema común en las paredes del primer piso es la presencia constante de eflorescencias, que es un desperdicio de sal polvoriento, frecuentemente blanco como la tiza. Esto sucede cuando un ambiente húmedo (suelo sulfatado) disuelve las sales de calcio del concreto y migran a la superficie por capilaridad. Ahora bien, un fenómeno como este podría ser fatal para la construcción, debido a la degradación del material y también para la salud humana. Hoy en día, la gente repara estas apariciones blancas, pero tienden a reaparecer. Por ello, el cemento MS se utiliza para evitar que esto ocurra, pero para ambientes muy agresivos los aditivos son la mejor opción, salvo por su precio. Es por ello que en esta investigación se produjeron y analizaron cilindros de concreto y vigas de mortero de 2 diseños. Estaban compuestos por agregado fino y grueso, cemento MS y emulsión asfáltica...
18
artículo
Publicado 2011
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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...
19
artículo
Publicado 2011
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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...
20
artículo
Publicado 2017
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En las edificaciones de las viviendas modernas el concreto es un elemento fundamental que interviene. De otro lado en las construcciones de puentes, diques, túneles, esto es en la construcción de estructuras no estándares de la ingeniería civil, el concreto que se utiliza es el de alto rendimiento (CAR) que aparte de los componentes básicos como el agua, cemento, agregados finos y gruesos, contienen otros aditivos cementantes, como las microsílices. El problema es conseguir un recurso tecnológico que ayude a pronosticar la resistencia de CAR a partir de sus datos de fabricación, pero esto es imposible. Sin embargo, se tiene las redes neuronales artificiales que cumplen este papel, que luego de entrenadas se transforman en verdaderas funciones matemáticas que aproximan los valores esperados de las resistencias de las probetas de concreto. El nivel de aproximación se estima por l...
