Physical and mechanical performance of cement-based renders with different contents of fly ash, expanded cork granules and expanded clay

Borges, Andreia; Flores‐Colen, Inês; Brito, Jorge de

doi:10.1016/j.conbuildmat.2018.10.043

Cited by 34 publications

(20 citation statements)

References 27 publications

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“…Previous studies that have tested the addition of expanded cork granules to mortars [24,25] concluded that the expanded cork has an impact on the properties of the mortars, increasing their porosity through the cork granules expansion. However, there is not much information about the addition of micro cork granules.…”

Section: Porosimetrymentioning

confidence: 99%

Hydraulic lime mortars incorporating micro cork granules with antifungal properties

Jerónimo

Soares

Aguiar

et al. 2020

Construction and Building Materials

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Section: Porosimetrymentioning

confidence: 99%

Hydraulic lime mortars incorporating micro cork granules with antifungal properties

Jerónimo

Soares

Aguiar

et al. 2020

Construction and Building Materials

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“…Pozzolans are also by-products of coal and agricultural products combustion (coal fly ash, rice husk ash, pam ash, sugar cane ash, etc.). The cement-pozzolan mortars were intensively studied during last 30 years [27,28,29]. On the other hand, studies on the use of pozzolans in lime-based masonry or rendering mortars are relatively rare.…”

Section: Introductionmentioning

confidence: 99%

Ternary Blended Binder for Production of a Novel Type of Lightweight Repair Mortar

et al. 2019

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The goal of the paper was development and testing of a novel type of ternary blended binder based on lime hydrate, metakaolin, and biomass ash that was studied as a binding material for production of lightweight mortar for renovation purposes. The biomass ash used as one of binder components was coming from wood chips ash combustion in a biomass heating plant. The raw ash was mechanically activated by grinding. In mortar composition, wood chips ash and metakaolin were used as partial substitutes of lime hydrate. Silica sand of particle size fraction 0–2 mm was mixed from three normalized sand fractions. For the evaluation of the effect of biomass ash and metakaolin incorporation in mortar mix on material properties, reference lime mortar was tested as well. Among the basic physical characterization of biomass ash, metakaolin and lime hydrate, specific density, specific surface, and particle size distribution were assessed. Their chemical composition was measured by X-Ray fluorescence analysis (XRF), morphology was examined using scanning electron microscopy (SEM), elements mapping was performed using energy dispersive spectroscopy (EDS) analyser, and mineralogical composition was tested using X-Ray diffraction (XRD). For the developed mortars, set of structural, mechanical, hygric, and thermal properties was assessed. The mortars with ternary blended binder exhibited improved mechanical resistance, lower thermal conductivity, and increased water vapor permeability compared to the reference lime mortar. Based on good functional performance of the produced mortar, the tested biomass ash could potentially represent a novel sustainable alternative to other pozzolans commonly used in construction industry. Moreover, reuse of biomass ash in production of building materials is highly beneficial both from the environmental and economic reasons especially taking into account circular economy principles. The ternary blended binder examined in this paper can find use in both rendering and walling repair mortars meeting the requirements of culture heritage authorities and technical standards.

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“…The outcome showed that cork granules resulted in lightweight specimens with a 68% gain in thermal conductivity and a 59% gain in bulk density for a 65% cork volume fraction in the composite compared to the clay sample. Indeed, the cork granules mortars tested by Borges et al [1] showed a flexural strength of 0.64 MPa and compressive strength of 1.37 MPa. The addition of cork to mortar binder reduces flexural strength between 72-75%, compressive strength between 84-97%, and thermal conductivity of 45% relative to the control blocks without cork.…”

Section: Introductionmentioning

confidence: 97%

“…The main purpose of the current study is to develop and propose an eco-friendly construction material of high thermal performance and an appropriate mechanical strength based on local and ecological raw materials. According to available literature, many research works considered incorporating cork granules in building materials like clay, mortars, concrete, and gypsum [1][2][3][4][5]. That leads to lighter composites with significantly improved thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Unfired Clay-Cork Granules Bricks Reinforced with Natural Stabilizers: Thermomechanical Characteristics Assessment

et al. 2021

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Cork is an ecological, natural, and renewable additive, an excellent thermal and acoustic insulator. All these attributes encourage its use in the building sector. Adding this additive to the Earth leads to a more lightweight composite with better thermal performance than the Earth alone. Unfortunately, the mechanical performance of this composite is degraded significantly, limiting its use in construction applications. The authors propose in this study to stabilize the clay-cork composite using natural stabilizers. A chemical stabilization was tested using local quick-lime, in addition to a physical stabilization using natural sheep-wool fibers. The primary purpose is to propose eco-friendly construction material with enhanced thermal and mechanical properties and the lowest environmental impact based on local and ecological raw materials to encourage more sustainable and low-energy constructions. First, physicochemical and mineralogical characterization of used clay was investigated. Then, an experimental investigation was conducted to identify the lime content that allows the optimal stabilization for the used clay. In this context, many different specimens of Bensmim soil stabilized with lime at six many contents 0, 10, 20, 30, 40, 50, and 70% were prepared and tested. The obtained results showed that the optimal lime content for the better stabilization of the used soil is about 30%. Next, an experimental study of thermomechanical properties was conducted on unfired clay bricks mixed with expended cork granules and stabilized by the addition of variable proportions of quick-lime 0, 10 and 30% and sheep-wool fibers 0, 1, and 2%. The mechanical performance of the specimens was investigated in terms of compressive and flexural strengths. At the same time, thermal quality was qualified through evaluating thermal conductivity using the steady-state Asymmetrical Hot Plate test method. The very encouraging experimental findings showed that using lime and sheep-wool fibers at the studied addition content resulted in lightweight composites with lower thermal conductivity and higher compressive and flexural strength than reference samples. The highest thermomechanical performances are obtained with clay-cork blocks reinforced with 30% lime content and 2% sheep-wool fibers. This block recorded values of 583 kg/m3, 0.155 W/m/K, 1.55 MPa, and 3.91 MPa, for bulk density, thermal conductivity, flexural and compressive strength respectively, compared to 765 kg/m3, 0.238 W/m/K, 0.96 MPa and 2.29 MPa for control samples. New material presents lightweight material for both improved thermal and mechanical qualities encouraging its use in building applications. Doi: 10.28991/cej-2021-03091778 Full Text: PDF

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Physical and mechanical performance of cement-based renders with different contents of fly ash, expanded cork granules and expanded clay

Cited by 34 publications

References 27 publications

Hydraulic lime mortars incorporating micro cork granules with antifungal properties

Hydraulic lime mortars incorporating micro cork granules with antifungal properties

Ternary Blended Binder for Production of a Novel Type of Lightweight Repair Mortar

Unfired Clay-Cork Granules Bricks Reinforced with Natural Stabilizers: Thermomechanical Characteristics Assessment

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