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Publications (33)
Shear in sprayed concrete (SC) may govern the design criteria in certain applications subjected to seismic loads or in bolted areas. However, it has been scarcely studied given the complexity of reproducing the production conditions in the laboratory and the lack of standardized tests. The paper focuses on the shear characterization of SC using a s...
The modulus of elasticity is a fundamental parameter for the structural design. It has been studied in the literature and several standards include equations to predict its value for conventional concrete. However, the same is not true in the case of sprayed concrete. This special concrete presents singular characteristics due to the spraying proce...
The sprayed concrete, which is widely used in underground constructions, requires a quick setting obtained by using set accelerating admixtures. Due to the current importance of this special concrete, an analysis of its mechanical properties derived from the incorporation of these admixtures is essential.
The European Standard ‘EN 196-1 – Methods o...
Es conocido que en el contexto del proceso constructivo de obras de hormigón, la proyección del material sobre una superficie a alta velocidad constituye una técnica de puesta en obra interesante desde el punto de vista productivo, ya que reúne dos etapas del proceso (colocación y compactación) en una sola acción constituida por la proyección. El h...
The hydration reactions that occur in wet-mix sprayed concrete have an exothermic nature, which is mainly manifested by a rise in temperature of the laid sprayed concrete. This rise in temperature, apart from the cement type and content, is directly related to the type and dose of the accelerating admixture used. This phenomenon takes place during...
Requirements of early set or rapid strength development in wet mix sprayed concrete imply the consideration of several aspects in the design of the concrete mix: such as the use of high cement content and set accelerating admixture, low water/cement ratio, and cements with high content of clinker (type I). However, environmental issues are gaining...
This article describes the methodology and presents results of a study of the evaluation of the post-cracking performance of shotcrete reinforced with high modulus polymeric fibers using two panel-based tests: the Plate Bending Test of EFNARC, and the Round Determinate Panel Test proposed by Bernard. A plain shotcrete and a steel fiber reinforced s...
Dadas las diferencias entre el hormigón de partida y el colocado, la evaluación de las propiedades de un hormigón proyectado, por vía húmeda o seca, se realiza mediante la extracción de testigos, evaluándose las propiedades mecánicas o deformacionales de forma uniaxial, según la dirección de la proyección. No obstante, son muchas las aplicaciones,...
The characterization of the behaviour in the fresh state is critical for self compacting concrete (SCC), and it is usually
performed through tests such as the slump flow or the V-funnel. A better description of SCC behaviour can be performed by
using viscometers. It has been recognized that in SCC an adequate combination of the rheological paramete...
It is well known that there are differences between the fresh mix concrete and the placed concrete sprayed using dry or wet-mix process. Because of that, the characterization of such material is carried out in cores extracted parallel to the spray direction from sample panels. However, in many applications (e.g. tunnel lining), considerable compres...
In this experimental work, which is aimed at a subsequent industrial application, the results of a study of the effects of environmental temperatures on aggregate’s properties and on the resulting mortar workability are presented. For this work, several physical properties of fine aggregates (sand of 5 and 2 mm) were defined, in order to establish...
En este artículo se presenta un estudio sobre los efectos de la temperatura ambiental sobre las prestaciones del hormigón, en estado fresco y endurecido, y sobre las propiedades de los materiales constituyentes del mismo, desde una perspectiva industrial. El objetivo principal es el de optimizar la dosificación del hormigón en climas cálidos y al m...
The present article discusses the effects of temperature on the performance of both fresh and hardened concrete and on the properties of its constituent materials, from an industrial perspective. The primary aim of the study was to optimize concrete in very warm environments. Certain industrial procedures are proposed to minimize the adverse effect...
La millora i optimització de processos, des del punt de vista econòmic, del producte, de la seguretat i salut laboral o del termini de lliurament, entre d’altres, és sens dubte una pràctica indispensable i constant en qualsevol organització que vulgui mantenir la seva competitivitat.Dintre d’aquesta bona pràctica, la gestió del coneixement juga un...
The reuse of by-products or waste from industrial processes in construction is an increasingly common practice. In this article, we present an experimental study aimed at evaluating the reuse of paper pulp waste generated in the manufacture of paper for non-structural elements in the form of a plaster–pulp composite material. The analysis of severa...
El diseño y aplicación del Hormigón Autocompactable (HAC) constituye uno de los temas de mayor impacto e interés en el mundo en el campo de la tecnología del hormigón. En términos reológicos un HAC se caracteriza por poseer una tensión umbral de cizallamiento muy baja y una viscosidad plástica capaz de garantizar el transporte, llenado y consolidac...
This work has as objective to study the influence of mixing hour in the concrete properties such as workability and compressive strength in hot and cold weather conditions from an industrially applied point of view. The foremost studied variable was the concrete mixing hour, having used five mixing hours for every weather conditions. For each mixin...
This article describes the methodology and presents results of a study of the evaluation of the post-cracking performance of shotcrete reinforced with high modulus polymeric fibers using two panel-based tests: the Plate Bending Test of EFNARC, and the Round Determinate Panel Test proposed by Bernard. A plain shotcrete and a steel fiber reinforced s...
El presente trabajo describe la metodología seguida y los resultados obtenidos en un estudio relativo a la evaluación de la tenacidad del hormigón proyectado con fibras poliméricas de alto módulo según dos procedimientos de ensayo distintos: el Plate Bending Test de la norma europea EFNARC de configuración hiperestática; y el Round Determinate Pane...
( * ) , A. Aguado de Cea ( ** ) , L. Agulló Fité ( ** SUMMARY The present article discusses the effects of temperature on the performance of both fresh and hardened concrete and on the properties of its constituent materials, from an industrial perspective. The primary aim of the study was to optimize concrete in very warm environments. Certain ind...
