Predicción del módulo resiliente del suelo-cemento por el método de la madurez y el monitoreo de temperaturas de fraguado
Fecha
2019-10-09Registro en:
Hernández G., L. C. & Lizarazo Salamanca, N. F., 2019. Predicción del Módulo Resiliente del Suelo-Cemento por el Método de la Madurez y el Monitoreo de Temperaturas de Fraguado. Bogotá D.C.: Universidad Santo Tomás
reponame:Repositorio Institucional Universidad Santo Tomás
instname:Universidad Santo Tomás
Autor
Hernández García, Liliana Carolina
Lizarazo Salamanca, Nelson Fernando
Institución
Resumen
This research seeks to establish a utility model that approves the procedure to estimate the strength of concrete by the maturity method established by ASTM C1074-19 and approved by the technical standard NTC 3756, to predict the resilient module measured at 28 days of cement soil age through the temperature record during its setting stage.
The cement floor is a hybrid material that is not possible to classify as a hydraulic concrete, so that this standard does not cover it to perform quality control on site. However, because it has a cementitious material, its evolution of resistance is a function of the degree of compaction, the water content, the uniformity of the compacted layer, the type of cement and the curing temperature.
The technique is adapted by developing three designs of cement soil mixtures (SC) prepared with added hydraulic cements: General Use (UG), High Early Resistance (ART) and Moderate Heat of Hydration (MCH). Whose theoretical compressive strength is 4.5 MPa at 7 days of age and the durability measured with the Humidity and drying test for twelve cycles of 10%.
With the dosages validated in the laboratory, samples are prototyped to establish the value of Q (Division between the Activation Energy and the universal gas constant) and the reference temperature T0, applying the Nurse-Saul and Arrhenius maturity method and using curing temperatures of 11, 30 and 40 ° C. The data obtained are then used in the calculation of the maturity factor through the recording of internal temperatures of the samples, taken during the first thirty hours of age.
In parallel, cylindrical samples were made with the three mixture designs cured at the three temperatures, which were failed in the cyclic Triaxial chamber at 28 days of age. With these values, he constructed a prediction model of the resilient module supported in the product between the maturity factor and the temperature increase recorded in the history of monitored temperatures during setting.