Lightweight masonry mortars made with expanded clay and recycled aggregates

Muñoz‐Ruiperez, Carmelo; Rodríguez, Ángel; Gutiérrez-González, S.; Carpintero, Verónica Calderón

doi:10.1016/j.conbuildmat.2016.05.065

Cited by 58 publications

(32 citation statements)

References 10 publications

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“…O formato irregular dos FAR justifica a maior superfície específica, pois quanto menos esférica é a forma da partícula, maior é a sua área superficial [35]. A maior superfície específica dos FAR justifica a maior absorção de água apresentada por AR [14,20,[36][37][38][39] e por consequência resulta em uma maior demanda de água em misturas de concretos e argamassas para manter a mesma trabalhabilidade. É importante ainda frisar que a absorção de água do AR é maior quanto menor é o tamanho das partículas.…”

Section: Resultsunclassified

Avaliação das propriedades físicas, químicas e mineralógicas da fração fina (<150 µm) do agregado reciclado de RCD

et al. 2019

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Avaliação das propriedades físicas, químicas e mineralógicas da fraçãofina (<150 µm) do agregado reciclado de RCD (Evaluation of the physical, chemical and mineralogical properties of the fine fraction (<150 µm) of the recycled CDW aggregate) ResumoFatores como o alto consumo de recursos naturais e os elevados volumes de resíduos produzidos pela indústria da construção civil alertam sobre a importância de reutilizar e reciclar os materiais. Assim, este trabalho objetivou determinar e avaliar as características físicas, químicas e mineralógicas dos finos do agregado reciclado (FAR), comparando-os com finos dos agregados naturais (FAN). Para tanto, determinaram-se a distribuição granulométrica, área específica, formato e textura superficial, índice de atividade pozolânica, óxidos presentes, teor de argamassa aderida e fases minerais. Os resultados mostraram que os FAR apresentam características que se destacam em relação aos FAN, dentre elas o formato mais irregular e superfície porosa. Entretanto, os FAR possuem melhor distribuição granulométrica, o que pode favorecer a compacidade das misturas. Em termos de desempenho pozolânico, os FAR não podem ser considerados como materiais pozolânicos, embora se faça necessário avaliá-los em finura requerida por norma. Palavras-chave: reciclagem, atividade pozolânica, construção civil, fração fina do agregado reciclado. AbstractFactors such as high consumption of natural resources and high volumes of waste produced by the construction industry warn the importance of reusing and recycling materials. Thus, this work aimed to determine and evaluate the physical, chemical and mineralogical characteristics of the fines of recycled aggregate (FRA), comparing them with fine natural aggregates (FNA). For that, particle size, specific area, shape and surface texture, pozzolanic activity index, oxides present, content of adhered mortar and mineral phases were determined. The results showed that the FRA have characteristics that stand out in relation to the FNA, among them the more irregular shape and porous surface. However, the FRA has a better particle size distribution, which may favor the compactness of the blends. In terms of pozzolanic performance, the FRA can not be considered as pozzolanic material, although it is necessary to evaluate them in the fineness required by standard.

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Section: Resultsunclassified

Avaliação das propriedades físicas, químicas e mineralógicas da fração fina (<150 µm) do agregado reciclado de RCD

et al. 2019

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“…The construction industry has increased the consumption of natural resources, including water and energy, as well as the emission of gaseous pollutants and waste generation. It has become clear that construction can be considered one of the industries that most contributes to changing the environment (1)(2)(3).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the physical-mechanical properties of cement-lime based masonry mortars produced with mixed recycled aggregates

Ferreira

Anjos

Ledesma³

et al. 2020

Mater. construcc.

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This study investigated the physical-mechanical effects of cement-lime mortars containing recycled aggregate of construction and demolition waste (CDW). The natural aggregate (NA) was replaced by volume at 25%, 50%, 75% and 100% by mixed recycled aggregate (MRA) obtained from the CDW crushing. Five types of mortars were prepared with a volumetric ratio of 1:1:6 (cement, lime and aggregate) and water/binder ratio based on the fixed consistency of 260 mm. The effects of MRA on fresh and hardened mortars’ properties were analyzed. The results were analyzed using a one-way ANOVA. MRA incorporation improved most of the physical-mechanical properties of mortars tested, except for hardened bulk density, water absorption and porosity. In the long-run, mechanical strengths significantly increased in all compositions, especially those with higher percentages of MRA. The results obtained showed that the use of MRA in masonry mortars is an alternative to reduce the generation of waste and consumption of natural resources.

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“…Therefore, in the last decade there have been many studies whose objectives have been to incorporate circular economy criteria in the manufacture of construction materials, specifically on cement mortars, for example the studies by Aciu et al [12], which conclude that it is possible to manufacture mortars with PVC waste, or the studies by Piña et al, [13], that confirm the feasibility of replacing, in mortars, glass or polypropylene reinforcing fibres by fibres from mineral wool residues, or the studies by Morales Conde et al [14], that analyse the Physical and mechanical properties of wood-gypsum composites from demolition material in rehabilitation works or the works done by Gadea et al [15], about lightweight mortar made with recycled polyurethane foam or the research projects done by Muñoz-Ruiperez et al [16], about mortars made with expanded clay and recycled aggregates.…”

Section: Introductionmentioning

confidence: 99%

Ecofibers for the Reinforcement of Cement Mortars for Coating Promoting the Circular Economy

et al. 2020

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Nowadays, nobody can deny that climate change is a reality and that the life cycle of buildings contributes greatly to that reality. Therefore, proposals such as the circular economy must be integrated into the construction sector. This article shows part of the results of a research project whose objective is to introduce circular economy criteria in building materials, seeking new uses for construction and demolition waste from buildings. In particular, this article analyses the possibility of replacing fibres currently used to reinforce cement mortars with recycled fibres. After consulting the bibliography, we can conclude that some studies analyse the behaviour of cement mortars reinforced with different types of fibres, but none has been found that analyses the behaviour of these mortars for the application of continuous coatings. For this purpose, a two-stage experimental plan is designed to test cement mortar samples with different types of fibres, recycled fibres and commercial fibres, taking into consideration the characteristics that these mortars have to comply to be applied as continuous coatings. Moreover, a detailed study about the porosity of these mortars and its influence on how the mortars behave with regard to compression, water vapour permeability and impermeability has been conducted. From the results obtained, it can be concluded that the mortars containing recycled fibres have very similar resistance, absorption and permeability values to those containing commercial fibres, so that they might be suitable for application as external coatings.

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Lightweight masonry mortars made with expanded clay and recycled aggregates

Cited by 58 publications

References 10 publications

Avaliação das propriedades físicas, químicas e mineralógicas da fração fina (<150 µm) do agregado reciclado de RCD

Avaliação das propriedades físicas, químicas e mineralógicas da fração fina (<150 µm) do agregado reciclado de RCD

Evaluation of the physical-mechanical properties of cement-lime based masonry mortars produced with mixed recycled aggregates

Ecofibers for the Reinforcement of Cement Mortars for Coating Promoting the Circular Economy

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