Análisis comparativo de suelo de campo y laboratorio para la medición de su capacidad portante con ensayos de Valor de Soporte de California (CBR) y Cono Dinámico de Penetración (DCP) en la Universidad Técnica de Manabí.

  The purpose of this investigation is to determine direct correlations by means of laboratory tests for the index of resistance to the cut of the Dynamic Cone of Penetration (DCP), with the resistance to cut California Bearing Ratio (CBR) of the soil, where it presents an alternative to establish Design criteria for pavement structures, based on physical and mechanical tests,  taking samples by means of soil exploration, they were subsequently processed in the laboratory demonstrating their properties where silts and clays with a high degree of plasticity predominate. Correlations proposed by (Van Vuuren, 1969) were taken, which experimentally mentions an equation suitable for all types of soils and the most accurate according to its reliability, the Dynamic Cone developed by (Scala, 1956), which, experimentally presents the following results in the field: The N°1 poll a 4.7% CBR, the N°2 poll a 3.61% CBR and the N°3 poll a 3.37% CBR, these mentioned parameters were obtained in a corresponding way from the DCP index of 40 mm/stroke, 50 mm/stroke, and 54 mm/stroke, in addition to laboratory tests that a more conservative parameter results were obtained for the poll N°1 a CBR of 3.98% the Poll, N°2 a CBR of 3.40% and the Poll N°3 a CBR of 3.20%.   Index Terms— Dynamic Cone of Penetration (DCP), California Bearing Ratio (CBR), Poll, Correlations, Test

Estudio comparativo de resistencias de hormigón de 240kg/cm2 usando los agregados finos, entre el rio Portoviejo y el rio Chone de la Provincia de Manabí.

Se realizó un análisis comparativo de materiales en un diseño de hormigón, usando  agregado  grueso  procedentes de la Cantera Megarok y San Agustín perteneciente a la Parroquia  Picoaza, con el uso de agregado fino de  dos sectores del rio Portoviejo. El otro agregado grueso que se utilizo fue de la Cantera la Chicha y para agregado  fino del rio Chone. En donde se compararon sus propiedades físicas mecánicas  de los materiales. Se plantearon tres alternativas de diseños para saber cuál aporta mayores resistencias es decir  las arenas de los ríos Portoviejo del Sector el Cady hasta el Puente San Ignacio, el rio   Lodana hasta el Pollo   y en Chone el sector Puente Olimpo hasta el sector Las Banderas, adicionalmente se comparó el agregado grueso entre las canteras Picoaza y la Chicha. Se tomaron muestras  de arena de tres meandros en cada rio, y con cada diseño se elaboraron 6 cilindros de hormigón para cada meandro probándolos a los 7, 14, y 28 días. Al analizar los resultados se concluye que las arenas finas de los dos sectores del   río Portoviejo  y el rio Chone no cumplen para su   utilización como agregado fino para hormigones de resistencias superiores a  F’c 240 kg/cm2 y al realizar el ensayo de resistividad superficial, se obtuvo valores no favorables.   Palabras claves - Resistencia de Compresión, Resistividad Superficial, Modulo de Finura. Hormigones, Arenas, Meandros.   Abstract A comparative analysis of materials was carried out in a concrete design, using coarse aggregate from the Megarok and San agustin Quarry belonging to Picoazá Parish, with the use of fine aggregate from two sectors of Portoviejo’s River. The other coarse aggregate that was used is from the La Chicha Quarry, and for fine aggregate  from  Chone’s  River.  Where  their physical mechanical properties of the materials were compared. Three design alternatives were proposed to know which one contributes the greatest resistance, that is, the sands of Portoviejo’s rivers, from the El Cady sector to the San Ignacio Bridge, the Lodana River to the Pollo, and in Chone, from the Olimpo Bridge to the Las Banderas sector, additionally the coarse aggregate between the quarries Picoazá and La Chicha where compared. Sand samples were taken from three meanders in each river, and with each design 6 concrete cylinders were made for each meander, testing them at 7, 14, and 28 days. When analyzing the results, it is concluded that the fine sands of the two sectors of Portoviejo’s River, and the Chone’s River; do not comply for their use as a fine aggregate for concretes with resistance  greater  than  F’c  240  kg/cm2  and when the surface resistivity test where made, unfavorable values were obtained. Index Terms - Compression Resistance, Surface Resistivity, Fineness Module, Concrete, Sands, Meander