Ingeniería Civil y Mecánica
Permanent URI for this communityhttp://repositorio.uta.edu.ec/handle/123456789/898
Browse
9 results
Search Results
Item Análisis de las correlaciones entre el CBR, DCP, propiedades índice y mecánicas en suelos de la parroquia Sigchos del cantón Sigchos, provincia de Cotopaxi(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2024-02) Garces Oñate, Christian Ariel; Pérez Maldonado, Ruth LorenaThe present experimental research work corresponds to a macroproject on correlations between the physical and mechanical properties of the soils of the province of Cotopaxi, by carrying out field and laboratory tests from representative soil samples, with the main objective of establishing empirical equations that, applied effectively, allow finding the properties of the soil based on other properties of the same in order to save time and money in carrying out essential tests for the design of pavements. The study area is included in the Sigchos parish belonging to the Sigchos canton, province of Cotopaxi, the experimental work was developed through phases, starting from a preliminary phase in which a technical inspection of the study area was carried out and established the sampling points, once the preliminary phase was completed, we continued with phase 1 in which the different soil tests were carried out in order to determine its index and mechanical properties, to continue with the phase 2 of carrying out the correlations between the results of the properties found, obtaining a total of twenty-four correlations with coefficients of determination between 68 and 98 percent, considered acceptable from 50 percent onwards. Finally, the results found from the laboratory CBR and the correlations are applied in the design of a flexible pavement for one of the roads studied, in order to demonstrate the applicability of the results of this experimental work.Item Correlación entre CBR, DCP, propiedades índice y mecánicas en los suelos de la parroquia La Maná del cantón La Maná, provincia de Cotopaxi(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2024-02) Pérez Camino, Erick Joel; Peñafiel Valla, Lourdes GabrielaThe presence of ballasted roads in the province of Cotopaxi in need of asphalt is evident; however, the existing database on the index and mechanical properties of the soils is insufficient. For the benefit of La Maná parish and areas with similar soil characteristics, the purpose of the experimental work is to find correlations between the mentioned properties and apply them to the design of flexible pavement. Four roads, located in different areas of the parish were identified. Test pits were made, removing the existing vegetative layer, followed by the extraction of 12 soil samples of approximately 50 kilograms at each identified points, field tests were carried out, and the samples were taken to be tested in the laboratories of the Civil Engineering department, respecting AASHTO and ASTM standards. Considering the results obtained from the tests, simple correlations were performed through regression analysis, and multiple correlations were established using the least squares method. Only correlations exceeding 70 percent, classified as good, were selected. As a result, 22 correlations between index and mechanical properties of the soils were determined, with correlation coefficients ranging from 0.7021 to 0.9538. Finally, a flexible pavement was designed for the rural areas of the parish, resulting in 6.5cm for the asphalt layer, 10cm for the base, and 15cm for the sub – base, with the CBR value obtained in the laboratory and by correlation.Item Influencia del tamaño nominal máximo del agregado grueso en la resistencia a la compresión del hormigón simple(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2024-02) Ruiz Gutiérrez, Nicole De Los Ángeles; Peñafiel Valla, Lourdes GabrielaThis project addresses the substantial impact that the coarse aggregate size has on the compressive strength of plain concrete. Considering sizes of 1 inch, 3/4 inch, 1/2 inch, and 3/8 inch, and design strengths of 240 kg/cm2 and 280 kg/cm2, correlations were established between both variables, considering the existing relationship between the mentioned factors. The properties of the materials to be used were determined by applying tests governed by some of the NTE INEN standards. Following this, the concrete mix designs were designed for each nominal maximum size of the coarse aggregate using the Central University of Ecuador's optimum density method. A total of 72 concrete cylinders were produced (9 for each nominal maximum size). 3 cylinders were tested according to each nominal maximum size at 7, 14, and 28 days, obtaining the necessary information for the data analysis, allowing the establishment of correlations between the nominal maximum size of the coarse aggregate and the compressive strength. The results showed a coefficient of -0.60, indicating that as the nominal maximum size of the aggregate is reduced, strengths above 100 percent of the design strength can be obtained. Similarly, when proposing correlations with the hardened density of the concrete, this coefficient was 0.74, which means that the density has a greater influence than the size. This only occurs for the sizes mentioned in this study.Item Análisis de las correlaciones entre el CBR, DCP, propiedades índice y mecánicas en suelos de la parroquia Ignacio Flores del cantón Latacunga, provincia de Cotopaxi(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2023-03) Pérez Villacrés, Katherine Lissette; Portilla Yandún, Favio PaúlThe California Bering Ratio (CBR) test allows determining the modulus of rigidity and the shear strength of the soil, however, it turns out to be an expensive and laborious test, in addition to taking time to prepare, especially in plastic soils, for which by applying correlations, these limitations can be overcome, obtaining reliable results without the need for the design to generate high costs. The zone designated for the present study was in the province of Cotopaxi in the Ignacio Flores parish, where through 12 samples the existing correlations between the index and mechanical properties of the soil were found, where field and laboratory tests were applied, being the most The DCP and CBR assay are important. 22 correlations were obtained, applying the linear regression method with simple and multiple correlations, for which correlation indices from 0.29 to 0.67 were obtained. Thus, ending with the design of the flexible pavement with a laboratory CBR of 10.3 percent having thicknesses of 5.0 cm of asphalt layer, 15.0 cm of base and 21.0 cm of subbase, while for a CBR calculated by Correlation No. 22, are 5 cm of asphalt layer, 15 cm of base and 21 cm of subbase.Item Análisis de las correlaciones entre el CBR, DCP, propiedades índice y mecánicas en suelos de la parroquia Pilaló del cantón Pujilí de la provincia de Cotopaxi(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2023-03) Trávez Vargas, Saúl Alejandro; Portilla Yandún, Favio PaúlThis experimental work arises from the need to expand the database of soils that represent the areas of the Cotopaxi province to serve as support in the preliminary studies of flexible pavements, for which the main objective is to analyze the correlations between the laboratory CBR, DCP, and the index and mechanical properties in soils of the Pilaló parish of the Pujilí canton of the Cotopaxi province. For the present work, 4 third-order roads were chosen around the entire surface of the parish where 12 soil samples were taken, making pits of 1.50m x 1.50m and 1m deep, taking in each pit more than 30 kg of altered soil. of subgrade. Field and laboratory tests were developed to know the properties of the soils obtained, once their results were known, they were analyzed and 25 correlations were obtained where their R^2global correlation coefficient is between 56% and 99% What we want to argue that moderate to very strong correlations were obtained. The equations obtained from the correlation of the different properties serve as a guide for preliminary pavement designs since the tests with which the correlations were obtained serve primarily to evaluate the conditions of the subgrade of roads, bases and subbases, in addition to providing in the expansion of the database of the Ecuadorian territory with the zoning of the different soils found in the Pilaló parish of the Pujilí canton of the Cotopaxi province.Item Análisis de las correlaciones entre el Cbr, Dcp, propiedades índice y mecánicas en suelos de las parroquias El Tingo y Guangaje del cantón Pujilí, provincia de Cotopaxi(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2023-03) Mayorga Viteri, Bryan Joaquín; Aldas Sánchez, Milton RodrigoThe CBR test is a test that requires a lot of time and money, which is why the purpose of this experimental project is to determine a method based on an analysis of the correlations between the CBR, DCP and the index and mechanical properties that serve as a means for predicting the CBR values. To begin with the technical part, the most representative roads in the parish of El Tingo and Guangaje were identified to take soil samples. The topsoil was removed by drilling, then field tests were carried out and samples of approximately 50 kilograms were collected at each point for the different tests that were carried out in the laboratory following the AASHTO standards. Based on the results obtained in the field and laboratory tests, simple and multiple correlations were carried out using regression analysis and the least squares method, respectively. Acceptable correlations were selected according to the coefficient of determination greater than 50 percent. Finally, 20 correlations were found with a coefficient of determination ranging from 62 to 98 percent. The determination of the CBR with the DCP using the correlations showed a ratio of 73 percent, obtaining values similar to the laboratory CBR. Therefore, these results can be used in the design of flexible pavements.Item Análisis de las correlaciones entre el Cbr, Dcp, propiedades índice y mecánicas en suelos de la parroquia Belisario Quevedo, cantón Latacunga, provincia de Cotopaxi(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2023-03) Pérez Pintado, Vanessa Fernanda; Portilla Yandún, Favio PaúlThe California Bearing Ratio (CBR) is the most widely used parameter for sizing flexible pavements worldwide; however, performing this assay is time consuming and has significant costs. To simplify this, a simple and multiple regression analysis was considered through the existing correlations between the index and mechanical properties of twelve representative samples of the study areas; taking into consideration for this, field tests (DCP, Field density) and laboratory tests (Natural Humidity, Granulometry, Atterberg Limits, Specific Gravity, CBR, Modified Proctor). In the analysis of results, the soils studied were classified as sandy with the presence of silt according to the SUCS and the ASSHTO; In the same way, correlations and simple linear regressions were integrated with a polynomial trend of degree two and multiple correlations, with the dispersion of results obtained from the previously mentioned tests. Twenty-two correlations were obtained, of which 54.55 percent of the results presented a coefficient of determination greater than 0.50, 40.90 percent showed values greater than 0.60, and only 4.55 percent showed a value of 0.36. However, the correlation determined through the higher CBR variables from an exponential formula was compared explicitly with the DCP according to ASTM D6951. Subsequently, the design of flexible pavements for the laboratory CBR and the calculated CBR was carried out.Item Análisis comparativo entre la humedad gravimétrica y la humedad determinada con sensores electrónicos en suelos finos del cantón Pastaza. provincia de Pastaza(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2022-09) Villacrés Chérrez, Robert Daniel; Portilla Yandún, Favio PaúlDue to the fact that it is vitally important to determine the gravimetric moisture content within Civil Engineering applied to concrete, resistance of the subgrade layer on roads, determination of foundations, implementation of piles, etc.; proceed with this comparative analysis. For the beginning of this investigation, different samples of fine soils extracted from the Pastaza canton were obtained, different laboratory tests governed by regulations were applied (moisture content, granulometry, Atteberg limits, modified Proctor type B), and analyzed. data provided by electronic sensors (capacitive and resistive) that determine the natural moisture content of the soil, for subsequent correlation and interpretation of how effective and reliable these sensors are. Through the comparison made from 15 samples between the gravimetric humidity and the humidity determined with electronic sensors, it was possible to determine that the resistive sensor provides an excellent correlation coefficient, with a value of 94 percent, for a working range of 566.50 to 924.33, while the capacitive sensor provides a good correlation coefficient, with a value of 70 percent for a working range of 339.67 to 532.33 in its field readings.Item Correlación entre el CBR, DCP, propiedades índice y mecánicas en suelos de la parroquia La Matriz del cantón Quero, provincia de Tungurahua(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2021-08) Molina Hinojosa, María José; Portilla Yandún, Favio PaúlThis project started with in-situ tests at each of the 12 randomly chosen sites in the parish under study. One pit per point, field density test (sand cone method), and dynamic cone penetration (DCP) were carried out. Subsequently, the necessary amount of natural soil was collected for the respective laboratory tests. The samples were tested in the laboratory, applying the corresponding standards for the determination of specific gravity, Atterberg limits, granulometry, maximum dry density, optimal moisture content and CBR. With the obtained data, correlations were developed between all the indicated properties, using the statistical analysis of regression and correlation for 2 and 3 variables, through the least squares method. Once this analysis was completed, a total of 23 correlations were obtained, with coefficients of determination ranging between 55 and 87 percent, considering these correlations to be reliable since the values exceeds 50 percent. Finally, previous the traffic study, the flexible pavement structural design of a rural highway in the study area was performed. For this, the CBR (subgrade) values of a soil sample, obtained both in the test, and in certain correlations, were used. Among other aspects, it is concluded that, for a preliminary highways soils study the application of the proposed correlations in this work is feasible, for an indirect obtainment of the analyzed properties of the studied soils types.