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Descripción
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| Increasing social awareness of environmental and nature resources conservation fosters a search for alternative solutions which would alleviate the impact of waste on human health and the environment. Nowadays construction sector is one of the sectors that have less developed over the years and that consume more natural recourses. Thus it is responsible for the consumption of 50% of natural recourses, 40% of energy and 50% generated waste in the field of industry. With an aim to reverse this situation, the use of construction and demolition waste (CDW) as a raw material in the fabrication of mortars and concretes, opens a new way to minimize the use of natural recourses in the sector of construction contributing in this way to more sustainable development of this sector. The main objective of this paper is to analyze the influence of addition of different types of fibres (fibreglass and steel fibre) on the main properties of recycled masonry mortars. To this end, the tests were developed using two types of binders: CEM II/B-L 32.5 N and CEM IV/B (V) 32.5 N. and 100% of natural sand was replaced with mixed recycled aggregates. Cement-to-aggregate by dry weight proportions were 1:3 and 1:4. Basing on the characterization of used materials, it can be stated that the main difference of recycled aggregates compared with natural sand is their high absorption and lower density. As the result of this high absorption, recycled mortars need significantly higher amount of water for mixes elaboration, what affects negatively their mechanical properties. Moreover, one of the most affected properties due to the high absorption of recycled aggregates is shrinkage. The results obtained in 72 hours show significantly higher shrinkage compared to traditional mortars, what provokes the necessity to use different types of fibres with an aim to minimize potential shrinkage of recycled mortars. The addition of both types of fibres has managed to decrease shrinkage of this material to 120 days, being steel fibre one that obtained lower shrinkage values of 30% what is close to the values obtained by mortars fabricated with natural aggregates. The tests of density, flexural strength, compressive strength, bond strength and water vapour permeability were carried out to complete the characterization of recycled mortars with addition of steel fibres. The obtained results show good mechanical properties of mortars fabricated with mixed recycled aggregates that moreover comply with the reference standards using both 1:3 and 1:4 dosage. In terms of the type of cement, statistical analysis that was carried out shows better properties of mixes elaborated with CEM IV/(V) 32.5N compared to mixes elaborated with CEM II/B-L 32.5 N. | |
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Internacional
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Si |
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Nombre congreso
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COINVEDI 2017 |
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Tipo de participación
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960 |
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Lugar del congreso
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Tenerife |
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Revisores
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Si |
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ISBN o ISSN
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978-84-933567-6-7 |
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DOI
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Fecha inicio congreso
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14/12/2017 |
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Fecha fin congreso
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15/12/2017 |
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Desde la página
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1 |
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Hasta la página
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9 |
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Título de las actas
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Proceedings of the IV COINVEDI |