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Isidro Sánchez     Institute, Department or Faculty Head 
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Isidro Sánchez published an article in March 2019.
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Top co-authors See all
Miguel-Ángel Climent

54 shared publications

Civil Engineering Department, University of Alicante, 03690 Sant Vicent del Raspeig, Alicante, Spain

José Marcos Ortega

25 shared publications

Departamento de Ingeniería Civil, Universidad de Alicante, Ap. Correos 99, 03080 Alacant/Alicante, Spain

Antonio José Tenza-Abril

20 shared publications

Departamento de Ingeniería Civil, Universidad de Alicante, Ap. Correos 99, 03080 Alacant/Alicante, Spain

Marta Cabeza

18 shared publications

Grupo ENCOMAT, Escola de Enxeñaría Industrial, Universidade de Vigo, Campus Universitario, 36310 Vigo, Spain

Teresa Real-Herraiz

9 shared publications

Departamento de Ingeniería Civil, Universidad de Alicante, Ap. Correos 99, 03080 Alacant/Alicante, Spain

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Publications See all
Article 0 Reads 0 Citations Effects of Red Mud Addition in the Microstructure, Durability and Mechanical Performance of Cement Mortars José Marcos Ortega, Marta Cabeza, Antonio José Tenza-Abril, ... Published: 08 March 2019
Applied Sciences, doi: 10.3390/app9050984
DOI See at publisher website ABS Show/hide abstract
Recently, there has been a great effort to incorporate industrial waste into cement-based materials to reach a more sustainable cement industry. In this regard, the Bayer process of obtaining alumina from bauxite generates huge amounts of waste called red mud. Few research articles have pointed out the possibility that red mud has pozzolanic activity. In view of that, the objective of this research is to analyse the short-term effects in the pore structure, mechanical performance and durability of mortars which incorporate up to 20% of red mud as a clinker replacement. As a reference, ordinary Portland cement and fly ash Portland cement mortars were also studied. The microstructure was characterised through mercury intrusion porosimetry and non-destructive impedance spectroscopy, which has not previously been used for studying the pore network evolution of red mud cement-based materials. The possible pozzolanic activity of red mud has been checked using differential scanning calorimetry. The non-steady state chloride migration coefficient and the mechanical properties were studied too. According to the results obtained, the addition of red mud entailed a greater microstructure refinement of the mortar, did not worsen the resistance against chloride ingress and reduced the compressive strength compared to control binders.
Article 0 Reads 0 Citations On the Possibility of Using Recycled Mixed Aggregates and GICC Thermal Plant Wastes in Non-Structural Concrete Elements Carlos Rodríguez, Isidro Sánchez, Isabel Miñano, Francisco B... Published: 25 January 2019
Sustainability, doi: 10.3390/su11030633
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Industrial wastes are often used as aggregate in concrete production to promote a more sustainable construction and to reduce production costs. This article presents the results of an experimental campaign on the influence of replacing natural aggregate with several construction and demolition wastes (C&DW) as recycled aggregate, as well as the use of fly ash and slag, wastes produced in Gas Incinerator Combined Cycle (GICC) thermal power plants, in the mix design of non-structural concrete. Different percentages of natural aggregates were substituted with recycled aggregates either coming from construction and demolition wastes, or from the coarse fraction of the slags from thermic plants in the manufacture of concrete. The mechanical properties, capillary water absorption, density, carbonation, chloride ingress and sulphate resistance have been tested. The results show a decrease in properties when C&DW are used. Fine fraction of slag and fly ash has an important advantage, and can even improve the long term properties of concrete prepared with natural aggregates. Coarse fraction of slag as a recycled aggregate generally improves most of the properties of manufactured concretes.
Article 0 Reads 1 Citation Long-term effects of waste brick powder addition in the microstructure and service properties of mortars José Marcos Ortega, Viviana Letelier, Carlos Solas, Giacomo ... Published: 01 September 2018
Construction and Building Materials, doi: 10.1016/j.conbuildmat.2018.06.161
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Article 0 Reads 2 Citations Short-Term Performance of Sustainable Silica Fume Mortars Exposed to Sulfate Attack José Marcos Ortega, María Dolores Esteban, Mark Williams, Is... Published: 18 July 2018
Sustainability, doi: 10.3390/su10072517
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Nowadays, the reuse of wastes is essential in order to reach a more sustainable environment. The cement production results in CO2 emissions which significantly contribute to anthropogenic greenhouse gas emissions. One way to reduce them is by partially replacing clinker by additions, such as silica fumes or other wastes. On the other hand, the pore structure of cementitious materials has a direct influence on their service properties. One of the most popular techniques for characterizing the microstructure of those materials is mercury intrusion porosimetry. In this work, this technique has been used for studying the evolution of the pore network of mortars with different percentages of silica fume (until 10%), which were exposed to aggressive sodium and magnesium sulfate solutions up to 90 days. Between the results of this technique, intrusion-extrusion curves and logarithms of differential intrusion volume versus pore size curves were studied. This characterization of the pore network of mortars has been complemented with the study of their compressive strength and their steady-state ionic diffusion coefficient obtained from samples’ resistivity. Generally, silica fume mortars showed different performance depending on the aggressive condition, although the greatest deleterious effects were observed in the medium with presence of both magnesium and sodium sulfates.
CONFERENCE-ARTICLE 33 Reads 0 Citations <strong>Effects of Silica Fume on the Pore Structure and Properties of Mortars Exposed to Sulphate Aggressive Media</str... José Marcos Ortega, María Dolores Esteban, Mark Williams, Is... Published: 17 May 2018
Proceedings of The 3rd International Electronic Conference on Materials Sciences, doi: 10.3390/ecms2018-05231
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The use of additions as clinker replacement has become very popular, due to the advantages that they provide, especially regarding the improvement of cement industry sustainability. The microstructure of cement-based materials has a direct influence on their service properties. In this research, mortars with different contents of silica fume (up to 10%) have been studied. These mortars were exposed to aggressive media with presence of sodium and magnesium sulphate along 90 days. On one hand, the evolution of their pore structure was characterised using different results provided by mercury intrusion porosimetry technique, such as intrusion-extrusion curves and logarithm of differential intrusion volume versus pore size curves. On the other hand, the compressive strength and the steady-state ionic diffusion coefficient obtained from resistivity of the samples, which was measured using impedance spectroscopy, were also studied. In general, silica fume mortars showed good performance, although the greatest deterioration of these mortars was observed in a mixed magnesium and sodium sulphate solution.

Article 0 Reads 0 Citations Influence of Waste Glass Powder Addition on the Pore Structure and Service Properties of Cement Mortars José Ortega, Viviana Letelier, Carlos Solas, Marina Miró, Gi... Published: 16 March 2018
Sustainability, doi: 10.3390/su10030842
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At present, reusing waste constitutes an important challenge in order to reach a more sustainable environment. The cement industry is an important pollutant industrial sector. Therefore, the reduction of its CO2 emissions is now a popular topic of study. One way to lessen those emissions is partially replacing clinker with other materials. In this regard, the reuse of waste glass powder as a clinker replacement could be possible. This is a non-biodegradable residue that permanently occupies a large amount of space in dumping sites. The aim of this work is to study the long-term effects (400 days) of the addition of waste glass powder on the microstructure and service properties of mortars that incorporate up to 20% of this addition as clinker replacement. The microstructure has been characterised using the non-destructive impedance spectroscopy technique and mercury intrusion porosimetry. Furthermore, differential thermal analysis was also performed. Compressive strength and both steady-state and non-steady-state chloride diffusion coefficients have also been determined. Considering the obtained results, mortars with 10% and 20% waste glass powder showed good service properties until 400 days, similar to or even better than those made with ordinary Portland cement without additions, with the added value of contributing to sustainability.
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