Jacinto Alonso Azcárate

Jacinto Alonso Azcárate
University of Castilla-La Mancha · Departamento de Química-Física

About

127
Publications
28,436
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
2,793
Citations
Introduction

Publications

Publications (127)
Article
Full-text available
A sepiolite mining by-product (SEP) has been studied as major component for lightweight aggregate (LWA) manufacture. Pellet bursting during firing was avoided by the addition of 2.5 wt% of thermoplastic waste (P) and 2.5 wt% P + 2.5 wt% carbon fiber residue (FC) in powder form. The mixtures were pelletized and then sintered at 1225˚C for 4 minutes...
Article
Lightweight aggregate bloating process has been studied by a simple experiment using an archetypal clay to know the actual amount of gas involved in expansion. Considering the relationship between gas loss (LOI) and volumetric changes over time, three main stages are identified: 1) a preheating stage of massive gas loss (close to 80% of the total)...
Article
Nine clays traditionally used in the ceramic brick and tile sector in Southern Europe were evaluated for the production of lightweight aggregates: four from Spain, three from Portugal and two from Italy. The clays’ suitability was thoroughly examined according to their capacity for pelletizing, their tendency to burst during heating, the firing tem...
Article
Full-text available
The suitability of three new lightweight aggregates containing carbon fiber residues (CAs) as components in structural lightweight concrete has been studied. Prismatic concrete specimens were prepared using these CAs as a coarse fraction. Additional specimens of normal-weight aggregate, commercial lightweight aggregate and mortar were prepared for...
Article
A 70:30 black-white clay mixture (C) has been blended with different proportions of three wastes: bagasse from beer production (BG), a flux sludge used in galvanization (FS) and fly ash enriched to 60% with K2O from a biomass plant (FA). A complete characterization of the raw materials was performed. Mixtures of C and FA for 15, 17.5 and 20 wt% of...
Chapter
Full-text available
The Permian-Triassic rifting represents the first of the two Mesozoic rifting stages recorded in the Iberian Peninsula. Its first phases of development started during the Early Permian, and were linked to the beginning of the break-up of Pangea, the large, unique and rheologically unstable supercontinent that mainly resulted from the collision of G...
Presentation
The Circular Economy model is based on the intelligent reuse of waste, so that it becomes a raw material to feed natural cycles or simply to be transformed into new technological products with a minimum energy expenditure (Lett, 2014). The growing concern on sustainability and environmental issues has led many researchers around the world to focus...
Presentation
Se ha estudiado la viabilidad de cuatro arcillas cerámicas de España, tres de Portugal y dos de Italia en la fabricación de áridos ligeros artificiales (ALAs), examinándose no sólo las propiedades tecnológicas del material obtenido, sino también la facilidad de pelletización, la tendencia al estallido durante el calentamiento y el coste energético....
Article
Mining activity can release important amounts of toxic metals which are able to move through the soil, water and air, or even to reach the human food chain. Consequently, the environmental and health issue related to ore extraction has led to an increased awareness of the importance of recovering mining sites. In this study, samples taken from tail...
Article
Twelve selected aggregates sintered from granite-marble-sepiolite wastes containing different proportions of powdered carbon fiber (FC) and thermoplastic (P) were studied by Rietveld X-ray diffraction, microscopy and thermal techniques to assess the influence of heating temperature (1100, 1125 or 1150 °C), dwell time (4, 8 or 16 min) and additive o...
Article
A one-year leaching experiment has been conducted in order to assess the effectiveness of several amendments on metal immobilization in mine tailings from an old Pb/Zn mining area of Central Spain (San Quintín mine). Demineralized water was used as leaching solution, selecting doses equivalent to the annual rainfall conditions of the studied area....
Chapter
Full-text available
Humanity has been mining Earth deposits for decades in order to extract tiny amounts of economically valuable metals and thereby, producing huge natural devastations of our planet. Recently, asteroids have grabbed our attention since they are fascinating objects carrying the hints of Solar System origin and, at the same time, containing large amoun...
Article
Three different wastes have been assessed for lightweight aggregate (LWA) manufacturing: granite and marble sludge (COR), sepiolite rejections (SEP) and polyethylene-hexene thermoplastics (P). A preliminary study of the physical and chemical properties of the raw materials was carried out to design proper batches. It was mixed 10% SEP with 90% COR...
Article
Abbreviations: BCR-SEP: optimized BCR sequential extraction procedure; b.d.l: below the detection limit; F1: weakly adsorbed, exchangeable and water- and acid- soluble fraction; F2: reducible fraction; F3: oxidable fraction; F4: residual fraction; HM: heavy metal; ICP-MS: inductively coupled plasma-mass spectroscopy; LOI: loss on ignition; LWA: li...
Article
Full-text available
Single extraction methods have been extensively used to assess the availability of metals in polluted soils. This work focused on checking the feasibility of several chemicals, i.e. CaCl2, EDTA, diethylenetriaminepentaacetic acid (DTPA) and a low-molecular-weight organic acid mixture (rhizosphere-based method), to be used as extractants for mercury...
Article
Full-text available
Although plastic limit (PL) is one of the parameters more widely used in the field of geotechnical engineering, the existing method for its determination (the thread-rolling test) is characterized by its low accuracy, repeatability, and reproducibility. These shortcomings have led to a great deal of criticisms, and in fact, several authors have tri...
Article
Full-text available
Martian meteorites can provide valuable information about past environmental conditions on Mars. Allan Hills 84001 formed more than 4 Gyr ago, and owing to its age and long exposure to the Martian environment, and this meteorite has features that may record early processes. These features include a highly fractured texture, gases trapped during one...
Article
Full-text available
Semiconductor photocatalysis is an effective method used to degrade organophosphorus compounds. Here, the potential of a commonly mixed oxide semiconductor, ZnO/CuO, has been examined to degrade methyl parathion. Sono-coprecipitation method was used to provide ZnO/CuO nanocomposites, and it was applied to photocatalytic and sono-photocatalytic degr...
Article
Full-text available
Analogues have been developed and characterised for both interplanetary dust and meteoric smoke particles. These include amorphous materials with elemental compositions similar to the olivine mineral solid solution series, a variety of iron oxides, undifferentiated meteorites (chondrites) and minerals which can be considered good terrestrial proxie...
Article
Washing aggregate sludge (WAS) from a gravel pit and sewage sludge (SS) from a wastewater treatment plant (WWTP) were analysed in terms of their physical, mineral and chemical characteristics. Both waste materials were mixed, milled and made into granules, pre-heated for 2 and 5 min and sintered in a rotary kiln at temperatures between 1175 °C and...
Article
This work is aimed to the establishment of some clues concerning metal uptake by the holm oak (Quercus ilex L.) in abandoned base metals (Pb-Zn) mining sites from central Spain. The study is based on total contents of potentially harmful elements (PHEs), including Pb, Zn, Cu, As, Sb, Cd and Hg, in leaves from holm-oak trees as well as in the corres...
Article
The thread rolling test is the most commonly used method to determine the plastic limit (PL) in soils. It has been widely criticized, because a considerable subjective judgment from the operator that carries out the test is involved during its performance, which may affect the final result significantly. Different alternative methods have been put...
Article
Full-text available
The Piedras River marshland and El Rompido spit bar is a Natural Site in close proximity to two of the most polluted rivers in the world: the Tinto and Odiel Rivers. The aim of this study is to determine the degree of contamination of this Natural Site using a variety of pollution indices. At this site the Holocene infilling sequence is recorded an...
Article
Full-text available
In this paper, a method based on element mapping of randomly selected areas of thin sections on electron microprobe is proposed to quantify the relative contents of strontium-rich hydrated aluminium phosphate-sulphate (APS) minerals in siliciclastic continental sedimentary rocks. The main problems for these minerals to be quantified are related to...
Conference Paper
Full-text available
Satellite and rocket reentries are of-ten characterized by partially fused rocket components, but rarely other surviving products are described. Lately we have noticed in the framework of the SPMN network studies the use of refractory composite materials that can also survive atmospheric entry [1]. On Feb-ruary 2012 an unusual rocket residue felt i...
Article
The standard thread rolling method for determining the plastic limit of soil, PL, has been widely criticized for requiring considerable judgment from the operator that carries out the test. In different studies other methods have been put forward; however, these methods cannot compete with the thread rolling test in simplicity, execution time and c...
Research
ABSTRACT. The standard thread rolling method for determining the plastic limit of soil, PL, has been widely criticized for requiring considerable judgment from the operator that carries out the test. In different studies other methods have been put forward; however, these methods cannot compete with the thread rolling test in simplicity, execution...
Research
Full-text available
This paper presents the preliminary results of a multidisciplinary study of the mixed wave-and-tide dominated estuary of the Piedras River in the mesotidal coast of the Gulf of Cadix. Nineteen hand cores and three mechanical drill cores allowed reconstructing the history of infill. Overlying the erosional surface incising the Mio-pliocene pre-estua...
Article
Full-text available
The goal of this research was to assess the potential of several industrial wastes to immobilize metals in two polluted soils deriving from an old Pb/Zn mine. Two different approaches were used to assess the performance of different amendments: a chemical one, using extraction by ethylenediaminetetraacetic acid (EDTA), and a biological one, using L...
Conference Paper
Full-text available
Most chondritic meteorites, have never experienced prolonged metamorphism or strong heating, hence, they preserve much of the record of the formational processes that led to the origin of our solar system. Consequently, we expect that the bulk chemistry in the components of chondritic meteorites provide new clues about the physico-chemical conditio...
Article
We report and describe an L6 ordinary chondrite fall that occurred in Ardón, León province, Spain (longitude 5.5605°W, latitude 42.4364°N) on July 9th, 1931. The 5.5 g single stone was kept hidden for 83 yr by Rosa González Pérez, at the time an 11 yr old who had observed the fall and had recovered the meteorite. According to various newspaper repo...
Article
Full-text available
A micro-Raman study of the carbonates in the martian meteorite ALH 84001, which allows us to obtain some clues about their specific mineralogy and formation.
Article
ICP-MS measurements test the influence of water in carbonaceous chondrites. We found a significant depletion of Na and K in CO and CMs in Antarctic chondrites.
Article
The effects of the prefiring and firing dwell times on the chemical, physical and microstructural properties of artificial lightweight aggregates (LWAs) produced from mining and industrial waste with a tubular rotary kiln were determined. It was observed that 1.5 and 3 min of prefiring and firing dwell times, respectively, were more adequate than 5...
Article
Full-text available
We analyze here a wide sample of carbonaceous chondrites from historic falls (e.g. Allende, Cold Bokkeveld, Kainsaz, Leoville, Murchison, Murray and Orgueil), and from NASA Antarctic collection in order to get clues on the role of aqueous alteration in promoting the reflectance spectra diversity evidenced in the most primitive chondrite groups. We...
Article
Full-text available
Villalbeto de la Peña is a chondritic breccia that has experienced a significant level of shock. On the other hand, we are exploring by using EDX, Raman and ICP-MS in which way impacts and aqueous alteration promoted changes in its bulk mineralogy.
Article
Full-text available
We are performing ICP-MS bulk chemistry of Antarctic and fresh falls carbonaceous chondrite members, which will inform us on primordial chemical signatures, and the effect that parent body aqueous alteration played in altering bulk chemistry.
Article
Full-text available
We present the observations of two fireballs that exhibit fast and quasi-periodic brightness variations along their atmospheric path. This phenomenon, which is known as “flickering”, is associated to the entry of spinning non-spherical meteoroids into the atmosphere. Both bolides were imaged in the framework of the continuous fireball monitoring an...
Article
Full-text available
On October 8th, 2011 the Earth crossed the dust trails left by comet 21P/Giacobini-Zinner during its XIX and XX century perihelion approaches with the comet being close to perihelion. The geometric circumstances of that encounter were thus favorable to produce a meteor storm, but the trails were much older than in the 1933 and 1946 historical encou...
Article
The chemical extraction of twenty-nine elements in a washing aggregate sludge, a clay-rich sediment, a sewage sludge, the mixtures of these materials and the artificial lightweight aggregates (LWAs) manufactured with them was determined by applying the optimized European Community Bureau of Reference sequential extraction procedure in order to esta...
Article
The presence of Sr-rich aluminium-phosphate sulphate (APS) minerals in continental sedimentary rocks from the Cañizar and Eslida Formations along the eastern part of the Iberian Range (Spain) is considered as evidence of acidic and oxidising conditions during Early–Middle Triassic times. The formation of APS minerals occurred shortly after sediment...
Article
Full-text available
Aluminum-phosphate-sulfate (APS) minerals, formed during early diagenesis in relation to acid meteoric waters, are the main host of Sr and S in the Early-Middle Triassic continental sandstones of the Iberian Ranges (east of the Iberian Peninsula). The sources of these elements and the effects of paleoenvironmetal changes on these sources and on the...
Conference Paper
Full-text available
Introduction: A superbolide was observed on July 21, 2012 over the center and south of Spain. The event was recorded in the framework of our continuous fire-ball monitoring and spectroscopic campaigns. Besides, because of optimal weather conditions, the bolide was imaged from ten meteor observing stations operated by the SPanish Meteor Network (SPM...
Conference Paper
The carbonate globules contained in ALH 84001 can provide interesting information about the early aqueous processes on Mars, as they were formed 3.9 Gyr ago.
Article
Full-text available
A multiple basic to intermediate sill is reported for the first time in the south-eastern Iberian Ranges. It is composed of several tabular to irregular levels intercalated within the fl uvial sediments of the Alcotas Formation (Middle-Upper Permian). The sill could represent the youngest Paleozoic subvolcanic intrusion in the Iberian Ranges. The i...
Article
Full-text available
This paper presents a study about the effectiveness of thermal treatment in the immobilization of different chemical elements within the structure of artificial lightweight aggregates (LWAs) manufactured with contaminated mine soil and fly ash. The heat treatment was totally effective in the immobilization of Cr, Ni, Cu, Zn, Pb, Be, Mn, Co and most...
Conference Paper
The hydrated groups of carbonaceous chondrites (hereafter CCs) exhibit different degrees of aqueous alteration. Primary minerals were transformed in their parent bodies by the action of the water. Most of the water was probably accreted as ice or bounded in hydrated minerals. Moderate heating associated with residual radioactivity or collisional co...
Article
Full-text available
The optimized BCR sequential extraction procedure was applied to washing aggregate sludge and fly ash, the raw materials used to produce artificial lightweight aggregates (LWAs) in a previous study. The mixtures of the raw materials and the two types of LWAs obtained have also undergone this procedure. As a result, it has been possible to evaluate...
Conference Paper
IR reflectance spectra for NASA Antarctic carbonaceous chondrites from the CM, CO, CH, and CK groups are presented. The location and relative depth of OH bands could be used to identify pristine regions of NEOs selected for future spacecraft missions.
Conference Paper
Orbital data for seven Taurid fireballs are presented. The main orbital elements of such orbits are compiled and compared to 2P/Encke. The orbital data indicate that most of the brightest 2010 Taurid events were associated with the northern branch.
Conference Paper
Full-text available
Introduction: On October 8 th , 2011 the Earth encountered the dust trails left by comet 21P/Giacobini-Zinner during its XIX and XX century perihelion ap-proaches. The encounter was forecasted in great detail [1, 2, 3]. Geometic circumstances were very favour-able to produce a meteor storm, but unfortunately the trails were older than in previous 1...
Conference Paper
Full-text available
Introduction: The development of a network of meteor observing stations allows for a continuous monitoring of meteor phenomena. One of the main goals of the SPanish Meteor Network (SPMN) is the analysis of the physico-chemical properties of meteor-oids from multiple station data. This provides useful data to improve our knowledge about meteoroid st...
Article
A multiple basic to intermediate sill is reported for the first time in the south-eastern Iberian Ranges. It is composed of several tabular to irregular levels intercalated within the fluvial sediments of the Alcotas Formation (Middle-Upper Permian). The sill could represent the youngest Paleozoic subvolcanic intrusion in the Iberian Ranges. The ig...
Article
The fractionation of five heavy metals in a washing aggregate sludge, a sewage sludge, a clay-rich sediment, the mixtures of these materials and the lightweight aggregates manufactured with them has been determined by applying the optimized European Community Bureau of Reference sequential extraction procedure in order to evaluate the effects of th...
Article
The microstructure and mineralogy of lightweight aggregates manufactured with washing aggregate sludge, sewage sludge and a clay-rich sediment have been studied. The mineralogical analysis revealed the neo-formation of plagioclase and pyroxene group minerals and a minor presence of gehlenite. Some relationships may be established: (i) heating tempe...
Article
The effect of the earthworm Lumbricus terrestris L. on metal availability in two mining soils was assessed by means of chemical extraction methods and a pot experiment using crop plants. Results from single and sequential extractions showed that L. terrestris had a slight effect on metal fractionation in the studied soils: only metals bound to the...