René Sebastián Mora-Ortiz

• PhD
• Universidad Juárez Autónoma de Tabasco

This research presents an experimental analysis of the mechanical behavior of masonry mortars incorporating disposable face masks (FMs) cut into two different sizes. The objective is to provide experimental data contributing to the consolidation of recycling FMs in mortar mixtures. To achieve this, two types of mixtures were prepared: one with stri...

Precipitation is a fundamental component of the Earth’s hydrological cycle. Therefore, monitoring precipitation is paramount, as accurate information is needed to prevent natural hydrological disasters, such as floods and droughts. However, measuring precipitation using rain gauges is complicated due to their sparse spatial distribution. Satellite...

Seismic risk management in urban areas requires accurate prediction of the expected seismic hazard. The seismic design standards in the world provide the seismic design spectra (DS). These are crucial for estimating seismic forces on a structure, are typically derived from theoretical models in deterministic or probabilistic seismic hazard studies,...

In this research, the use of the pre-wetting technique is proposed as an ecological alternative to reduce water absorption in waste oyster shells used in the production of masonry mortar as a partial substitute for natural sand. An experimental study was conducted to assess the properties in both the fresh and hardened states of masonry mortars. Tw...

En esta investigación se realizó la simulación hidrológica de la cuenca del río Teapa con el modelo hidrológico distribuido CEQUEAU para el periodo de 1980 a 2017. Los objetivos de este trabajo son: a) evaluar la eficiencia del modelo hidrológico CEQUEAU para simular los caudales medios diarios de la cuenca del río Teapa, y b) calibrar y validar el...

During strong earthquakes, structural damage usually occurs, resulting in a degradation of the overall stiffness of the affected structures. This degradation produces a modification in the dynamic properties of the structures, for instance, in the fundamental period of vibration (T1). Hence, the variation of T1 could be used as an indicator of seis...

El daño esperado en las edificaciones por los sismos se puede determinar con la máxima distorsión de entrepiso (max) y depende del tipo de edificio y de las características del sismo. En esta investigación se presenta un nuevo índice del potencial del daño (IPDSaT1-IA-ΔIA) de los sismos, basado en su intensidad de Arias (IA), la duración significa...

In this research, the mechanical behavior of masonry mortars made with partial substitution of sand by recycled fine aggregates (RFAs) of mortar (MT) and recycled clay brick (RCB) was compared. Mortar specimens were built in two groups (MT and RCB) considering different replacement proportions by dry weight. To reduce the water absorption of RFAs d...

La disposición inadecuada de los Residuos de la Construcción y Demolición (RCD), en especial del vidrio, acarrea muchos problemas económicos y ambientales. Por esta razón el objetivo de esta investigación es evaluar los efectos del uso del vidrio triturado como sustituto parcial de la arena natural en la elaboración de mortero de albañilería, espec...

The seismic regulations for the seismic performance assessment of buildings use the maximum interstory drift, θmax, as a measure to control damage. This article presents a study of the seismic performance based on the θmax for steel buildings using Mexico's regulations and the RISK-UE and HAZUS guidelines. The capacity spectrum method is used to ev...

El agua es un recurso natural fundamental para la vida en la Tierra y es el componente básico del ciclo hidrológico. La evaluación de la cantidad de agua disponible en una cuenca es un requisito para el desarrollo y administración de los recursos hídricos, ya sea para suministrar agua a la población, agricultura, industria o para la producción de e...

In this research we evaluated the use of recycled fine mortar aggregate (RFMA) as a fine aggregate for new masonry mortar creation. The pre-wetting effect on the aggregate before creating the mixture was analyzed as a method to reduce its absorption potential. A control mixture of conventional mortar and two groups of recycled mortars were designed...

Activated carbons (ACs) are obtained from coconut shell (endocarp) through chemical activation using H3PO4 as activating agent. Ground coconut shell is impregnated with H3PO4 for 24 and 48 h; then pyrolyzed at 600 and 800 °C. Some ACs are additionally mixed with nickel oxide (NiO) for obtaining NiO/AC composites. The morphological characteristics a...

Recycling is an important habit to avoid waste. This paper evaluates the performance of masonry mortar, elaborated by replacing natural sand with recycled fine aggregate (RFA) obtained from mortar. Five families of mixtures were prepared with different replacement proportions: 20%, 40%, 60%, and 100%. A 1:4 volumetric cement-to-aggregate ratio was...

Durante la época de lluvias se presentan en el estado de Tabasco (México) deslizamientos en los bordos de los ríos que atraviesan la entidad, siendo los de la zona conocida como La Manga de los más afectados. Este artículo presenta el análisis de la evolución de la estabilidad de uno de estos bordos debido a los cambios en el grado de saturación de...

Durante la ejecución de obras de ingeniería es común que el suelo que se desea utilizar no cumpla con los criterios de calidad que la normativa correspondiente exige para garantizar la estabilidad estructural de la obra. Para aquellos casos en los que el valor del índice de plasticidad del suelo excede el máximo permitido, la estabilización química...

Currently, worldwide, many nations are paying close attention to the improvement and optimization of the usage of recycled materials in the building sector. The increase in the raw materials and the increased environmental awareness have gained considerable importance on a global scale. In road engineering, the waste material is used for the design...

This paper presents a revision of some of the models that have been proposed to estimate the strength of unsaturated soils. The theoretical results obtained from these models are compared with the experimental results of controlled suction triaxial tests made on silty sand. The model that resulted in the best prediction was used to determine the st...

A number of slopes that have been stable during many years may fail when an extraordinary rain period occurs. This phenomenon involves not only the lithology, the geometric and the mechanical characteristics of the slope but also the rain–evaporation–infiltration regime of the site. In this paper, the stability of a slope in the comunity of San Jua...

A number of slopes that have been stable during many years may fail when an extraordinary rain period occurs. This phenomenon involves not only the lithology, the geometric and the mechanical characteristics of the slope but also the rain-evaporation-infiltration regime of the site. In this paper, the stability of a slope in the comunity of San Jua...

A number of slopes that had been stable during many years suffer from sliding when an extraordinary rain period occurs. This phenomenon involves not only the lithology, the geometric and the mechanical characteristics of the slope, but also the rain-evaporation-infiltration regime of the site. In this paper, the stability of a slope in the km 240+0...