Browsing by Author "Mora Abril, Diana Bernardita"

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Caracterización de materiales y diseño de hormigones comerciales bombeados para la empresa Hormi Center a partir de la adaptación del método de diseño de mezclas de concreto según ACI 211.1 y Fuller, con el tipo de cemento HE de la casa cementera HOLCIM
(Universidad de Cuenca, 2022-02-11) Briones Rodriguez, Erika Viviana; Mora Moscoso, Paúl Sebastián; Mora Abril, Diana Bernardita; García Arpi, Joselin Sofía
In recent years, the ready-mixed concrete industry has notably increased its presence in the construction sector. This work seeks to analyze the feasibility and improvement of commercial ready-mixed concrete designs for the Hormi Center production facility. This is done by estimating two parameters, the slump measured by means of the Abrams cone slump test over a period of two hours at thirty-minute intervals, and the compressive strength determined at 7, 14 and 28 days of age. In order to achieve this, test mixtures are made with additives (a retarder and a plasticizer) from BASF, SIKA and PROTEX, using Holcim's HE cement and aggregates from the VIPESA and El Piedrero mines, on the basis of the existing designs from the company and redesigning with the principles established by means of the ACI 211.1 method and the Fuller Thompson method in order to obtain the proportions of the aggregates to be used in the mixture. With the obtained results with each house of additives used, the behavior of the concrete in fresh and hardened state is analyzed, coming to the conclusion that the concretes made with BASF additives, successfully meet with the physical-mechanical properties (slump and compressive strength) requested by the Hormi Center Company, slump loss in a period of two hours not greater than 8 cm and with compressive strengths higher than design strengths with more than 30% at 28 days of age, additionally, it shows the lowest production costs for each of the designs
Diseño de sistemas de filtración gruesa horizontal para servicio a las cabeceras parroquiales de El Valle, Quingeo y Checa
(1991) Merchán G., Rosalía; Mora Abril, Diana Bernardita; Ordóñez Espinosa, Galo
Hormigones con agregados cerámicos: caracterización del hormigón resultante de utilizar el desecho de la industria cerámica de la ciudad de Cuenca como agregado grueso
(2014-11-11) Mora Abril, Diana Bernardita; Zalamea León, Juan Fernando
The present investigation determines the effects of totally substituting concrete coarse aggregate (natural gravel) by gravel obtained from ceramic industry waste in the city of Cuenca, Ecuador. The name of this waste is “chamota” and it comes from formed and burned pieces that are broken when crockery is being elaborated. “Chamota” without enamel will be used in this study. Effects in mechanical resistance, density, and absorption of concrete are investigated. To accomplish these objectives, compressive strength, traction strength, water absorption by total immersion, and density are determined. The results show that for ceramic concrete elaborated with ceramic aggregate completely obtained of trituration, density reduced by 12%, compressive strength (f’c) reduced by 70%, and flexion strength (MR) reduced by 44% when compared to traditional concrete. MR/f’c ratio is 0.29 for ceramic concrete whereas for traditional concrete is 0.17. For ceramic concrete elaborated without fine aggregate density reduced by 10%, and compressive strength reduced by 58%. Hence, due to the low resistance values obtained in the ceramic concrete and its high permeability, it is concluded that its use as structural concrete is not viable.
Optimización de los diseños de hormigón para la empresa HORMI CENTER mediante las curvas relación agua-cemento vs. resistencia a compresión para los agregados de Santa Isabel y Paute
(Universidad de Cuenca, 2023-07-25) Chuchuca Guazhco, Damián Santiago; Duchi Calderón, Jorge Luis; Mora Abril, Diana Bernardita
The purpose of this degree project is to determine optimal water/cement (W/C) ratios for the production of concrete designs that meet the most common compressive strength requirements for Hormi Center, a company. The designs are developed for two types of cement: Atenas HE and Atenas GU, as well as two types of aggregate combinations from different sources. The first combination consists of fine aggregate from Santa Isabel and coarse aggregate from Santa Isabel, while the second combination involves fine aggregate from Santa Isabel and coarse aggregate from Paute. The designs must have the required initial slump specified by the plant, and the compressive strengths are determined at 7 and 28 days. The work consists of several processes, such as aggregate characterization, optimal combination of aggregates using the Fuller Thompson method, obtaining proportions using the mix design method following the ACI 211.1 methodology. The designs obtained are tested in accordance with standardized laboratory tests according to NTE INEN to verify compliance with the requirements. Subsequently, the optimal water/cement ratio is identified for the established compressive strengths. Finally, the cost difference between the proposed designs and the ones currently used by the company is calculated.