José-Luis Parra

• Universidad Politécnica de Madrid

Concrete and Portland cement-based products are the most widely used materials in the construction industry. According to the Global Cement and Concrete Association (GCCA), 14 billion cubic meters of concrete are consumed worldwide every year. Knowledge of their properties is essential to ensure the quality of concrete products and structures. Know...

Several gold deposits in the eastern region of Cuba are genetically related to the island arc- and the ophiolitic complex formation. These have been studied and exploited since the time of the Spanish colonization in the mid-sixteenth century. These deposits belong to the Aguas Claras-Guajabales mineral field in the Holguín Province (Cuba) and lie...

The gold deposits of the eastern region of Cuba are genetically related to the lithological formations of the island arc and the ophiolitic complex, which have been studied and exploited since the time of the Spanish colonization in the mid-sixteenth century. These deposits are part of the so-called Aguas Claras-Guajabales mineral field, in the Hol...

This chapter details the methodology used to examine the field diaries written by students from the Universidad Politécnica de Madrid who participated in the “Service-Learning in Engineering” training activity. We used the specialized qualitative data analysis software Atlas.ti to analyze these texts, complemented with advanced language processing...

The sources of aggregates for construction materials in the area surrounding Medellín, Western Colombia, are experiencing a significant decrease due to the depletion of their resources and reserves and the policies of land use in territorial planning. The objective of this study is to identify and assess the potential sources of aggregates for the...

Presently, the search for urgent solutions to mitigate climate change has become a global priority. One of the most important challenges is the characterization, standardization, and technology of sustainable natural raw materials, which will significantly improve the quality of common types of cement, the production process of which emits large am...

The object of this work is to study and characterize diatomites from the southeast of the Iberian Peninsula to establish their character and quality as natural pozzolans. This research carried out a morphological and chemical characterization study of the samples using SEM and XRF. Subsequently, the physical properties of the samples were determine...

The eruption of the Cumbre Vieja volcano on 19 September 2021, resulted in the deposition of large quantities of volcanic ash (VA), causing a great impact on the citizens. This work aims to study the properties of this volcanic ash as pozzolanic raw materials to establish their potential use in the development of sustainable cement. Results of chem...

The speed at which climate change is happening is leading to a demand for new pozzolanic materials that improve the quality of cements and, at the same time, limit the emission of greenhouse gases into the atmosphere. The main objective of this work is the detailed characterization of an ignimbrite sample (IGNS) to demonstrate its effectiveness as...

The geological nature of the territory of the Republic of Cuba has favoured the formation of large and varied deposits of volcanic tuffs enriched by various species of zeolites. Today, new zeolite deposits continue to be discovered in the country. This work aims to present the results of a study carried out in an unexplored area that is located app...

University students face situations throughout their careers that are sometimes difficult to overcome due to their lack of experience or preparation. Mentoring programs in university education have been proven to be a great accompaniment tool to solve these difficulties in addition to helping students’ personal and professional development. Our stu...

This work presents the results of the partial substitution of Portland cement (PC) by natural fluorite (NF) and calcined fluorite (CF) in mortars, at 10%, 25% and 40%. To meet these objectives , a sample of fluorite was initially studied by XRD, SEM and Raman Spectroscopy (RS). A chemical quality analysis (CQA) and a chemical pozzolanicity test (CP...

This paper shows the results of a study focused on the evolution and properties of mortars made with a mixture of portland cement (PC) and natural mordenite (Mor). To begin, samples of mordenite, cement and sand were studied with X-ray diffraction (XRD), X-ray fluorescence (XRF) and granulometric analysis (GA). Next, mortars with a ratio of 75% PC...

This work presents the results of the study of the physical, chemical, mineralogical and pozzolanic properties of the altered volcanic tuffs (AVT) that lie in the Los Frailes caldera, south of the Iberian Peninsula, and demonstrates their qualities as pozzolans for the manufacturing of mortars and pozzolanic cements of high mechanical strength. The...

Palabras Clave: Holguín, áridos. RESUMEN: La actividad minera relacionada con la explotación de oro en la región noroccidental de Holguín, Cuba, se inició en los periodos de la colonización española. A partir de esa época, y hasta la década de los 90s, se mantuvo de forma intermitente, hasta que con el colapso del campo socialista y la ruptura de l...

The disposal of coal by products represents environmental and economical problems around the world. Therefore, the reuse and valorisation of this waste has become an important issue in the last decades. While high-value construction products containing fly ash were developed and its use is actually totally accepted as an addition to cement, the use...

This paper assess the mechanical an environmental behaviour of cement mortars manufactured with addition of fly ash (FA) and bottom ash (BA), as partial cement replacement (10%, 25% and 35%). The environmental behaviour was studied by leaching tests, which were performed under several temperature (23 °C and 60 °C) and pH (5 and 10) conditions, and...

The research conducted in Italy and in Spain deals with the feasibility of reusing, in building sector, without any previous treatment, the marble powder deriving from marble processing plants. The goal of this study is to identify alternative uses of the residual sludge instead of its landfill disposal. Firstly, chemical physical and mineralogical...

We attempt to apply the use of easy and non destructive tests to the measurement of ornamental rock weathering. These tests have not previously been used, or have been used to a lesser extent up to now. They are measurement of the density variation with the "helium stereopicnometer', and the measurement of the colour index with the "chromatic coord...

2)Escuela Técnica Superior de Ingenieros de Minas. C/ Ríos Rosas, 21. 28003. Madrid. (costafreda@yahoo.es), (joseluis.parra@upm.es) y (domingoalfonso.martin@upm.es) RESUMEN El presente trabajo propone sustituir la proporción que corresponde al yeso en un cemento pórtland por zeolita natural, a fin de regular el fraguado de la pasta en condiciones m...

RESUMEN Aunque actualmente son conocidas por su multifuncionalidad, las zeolitas naturales siguen ofreciendo nuevos retos a los investigadores, por su adaptación, prácticamente ilimitada, en campos multidisciplinares que abarcan la salud, nanotecnología, agroindustria, la química y otros muchos. La composición relativamente sencilla de estos minera...

RESUMEN El presente trabajo tiene como objetivo estudiar la viabilidad de la utilización de áridos reciclados en la fabricación de morteros y hormi-gones. Para la realización del mismo se ha procedido a realizar una caracterización completa de los áridos reciclados, recogiéndose a con-tinuación dos experiencias de fabricación, respectivamente, de m...

RESUMEN En el presente trabajo se hace una valoración de los recursos existentes en una explotación de áridos estudiando parámetros dinámicos mediante técnicas geofísicas y parámetros estáticos mediante ensayos de caracterización de arcillas en laboratorio. Esta doble actuación obedece a la nueva normativa aplicada a las explotaciones mineras en la...

RESUMEN En este artículo se describe el modo de elaborar un hormigón, a escala industrial, con áridos reciclados y verificar el comportamiento y prestaciones de dicho hormigón tanto inicialmente como con el tiempo, mediante la construcción de diversas estructuras. PALABRAS-LLAVE Áridos reciclados, hormigón, prueba industrial, dosificación, resisten...

RESUMEN El presente trabajo tiene como objetivo principal demostrar la presencia de oro en cantidad industrial en el flanco oriental del yacimiento Reina Victoria. Las explotaciones de menas auríferas desde la época colonial española y durante el período de la Revolución Cubana se llevaron a cabo en la parte central de dicho yacimiento, ignorándose...

Los materiales puzolánicos reactivos son muy conocidos actualmente, así como sus beneficios en la mejora de gran número de cementos. El presente trabajo tiene la intención de mostrar algunos resultados prácticos, obtenidos de recientes investigaciones de tobas de composición dacítica, capaces de sustituir al cemento pórtland de alta resistencia ini...

Existen numerosos yacimientos e indicios de bentonitas en la región sureste de España, muchos de ellos investigados en detalle desde hace varias décadas. Las bentonitas están constituidas, mayoritariamente, por minerales del grupo de las esmectitas, siendo la montmorillonita la especie más abundante. Se han formado por la alteración hidrotermal de...

El presente proyecto tiene por objeto, determinar la viabilidad técnica, del empleo de áridos reciclados a partir de Residuos de Construcción y Demolición (ladrillo, hormigón), para la fabricación de hormigones. Para ello, se han analizado las distintas propiedades de los áridos, tanto naturales tipo calizo y silíceo, como reciclados. Dichas propie...