Thermal mortar-based insulation solutions for historic walls: An extensive hygrothermal characterization of materials and systems

Posani, Magda; Veiga, Rosário; Freitas, Vasco Peixoto de

doi:10.1016/j.conbuildmat.2021.125640

Cited by 28 publications

(12 citation statements)

References 60 publications

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“…Methodology adopted in the study. *: data from a previous experimental investigation by the authors [38].…”

Section: Methodsmentioning

confidence: 86%

“…The main preparatory steps for the study consist of the choice of three case studies, the measurements performed on-site, and the use of the experimental results for validating numerical simulations. Another fundamental part is the hygrothermal characterization of thermal rendering systems via laboratory testing, which was performed in a previous study by the authors [38]. The data obtained in the aforementioned study are used as input in the numerical simulation tool.…”

Section: Methodsmentioning

confidence: 99%

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Thermal renders for traditional and historic masonry walls: Comparative study and recommendations for hygric compatibility

Posani

Veiga

Freitas

2023

Building and Environment

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“…Methodology adopted in the study. *: data from a previous experimental investigation by the authors [38].…”

Section: Methodsmentioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Thermal renders for traditional and historic masonry walls: Comparative study and recommendations for hygric compatibility

Posani

Veiga

Freitas

2023

Building and Environment

Self Cite

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“…Overall, the highly porous Liaver structure enhanced the thermal behavior, and Liaver-containing mortars ended up being the best thermal insulation material of all the examined possibilities. However, the gained thermal conductivity was still high in comparison to the standard thermal insulation materials [ 67 , 68 ].…”

Section: Resultsmentioning

confidence: 99%

Magnesium Potassium Phosphate Cement-Based Derivatives for Construction Use: Experimental Assessment

et al. 2022

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The presented research is focused on the development and testing of the magnesium potassium phosphate cement-based materials (MKPC-based). Firstly, the fresh state properties of the pastes consisting of dead burned magnesia powder, potassium dihydrogen phosphate, setting retarder borax applied in the range of 0–10 wt.%, and batch water were investigated. The aim of testing was to characterize the hydration process in dependence on the borax content. The properties of raw MgO powder were described by chemical composition and particle size distribution. The properties tested in fresh state included shear stress (viscosity), Young’s modulus of elasticity, and temperature; their time dependence was observed. The measurements started immediately after the mixing process. At the age of 14 days, basic structural and mechanical properties of the hardened pastes were obtained. The mixture with 5 wt.% of borax proved to be the most advantageous in terms of setting time, sample integrity, and mechanical strength; therefore, it was chosen as the binder for the following part of the study—MKPC-based mortar development. In the next step, the MKPC paste containing 5 wt.% of borax was supplemented by silica sand aggregate, and the resulting material was marked as a reference. Subsequently, three other mixtures were derived by replacing 100% of quartz sand by lightweight aggregate; namely by expanded glass aggregate, waste rubber from tires, and combination of both in ratio 1:1. The aggregates were characterized by chemical composition (except for the rubber granulate), and loose and compacted powder density. For the resulting hardened composites, basic structural, hygric, strength, and thermal parameters were investigated. The use of lightweight aggregates brought in a considerable decrease in heat transport parameters and low water permeability while maintaining sufficient strength. The favorable obtained material properties are underscored by the fact that magnesia-phosphate is considered to be a low-carbon binder. The combination of magnesia-phosphate binder and recycled aggregate provides a satisfying, environmentally friendly, and thermally efficient alternative to traditional Portland cement-based materials.

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“…In this work, a transient method was adopted, considering the method reported by Antunes et al [33] and Liuzzi et al [20], as reported in Table 2. The transient method offers several benefits [53,54], in particular the smaller dimension of the testing area. This allowed performing the measurement in different parts of the surface of each sample, indicated in Figure 2a.…”

Section: Methodsmentioning

confidence: 99%

Bio-Wastes as Aggregates for Eco-Efficient Boards and Panels: Screening Tests of Physical Properties and Bio-Susceptibility

et al. 2022

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Screening tests were developed or adapted from RILEM recommendations, standards and past studies, and carried out to characterize some agro-industrial wastes and to assess their feasibility as aggregates for eco-efficient building composites. Spent coffee grounds, grape and olive press waste and hazelnut shells were used, as well as maritime pine chips as control material. Particle size distribution, loose bulk density, thermal conductivity and hygroscopicity properties were analysed. The selected bio-wastes did not show good thermal insulation properties if compared with some bio-wastes already studied and used for thermal insulation composites. Values of loose bulk density and thermal conductivity were between 325.6–550.5 kg/m3 and 0.078–0.107 W/(m·K); moisture buffering values higher than 2.0 g/(m2·%RH). Biological susceptibility to mould and termites were also tested, using not yet standardized methods. The low resistance to biological attack confirms one of the greatest drawbacks of using bio-wastes for building products. However, final products properties may be changed by adding other materials, pre-treatments of the wastes and the production process.

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Thermal mortar-based insulation solutions for historic walls: An extensive hygrothermal characterization of materials and systems

Cited by 28 publications

References 60 publications

Thermal renders for traditional and historic masonry walls: Comparative study and recommendations for hygric compatibility

Thermal renders for traditional and historic masonry walls: Comparative study and recommendations for hygric compatibility

Magnesium Potassium Phosphate Cement-Based Derivatives for Construction Use: Experimental Assessment

Bio-Wastes as Aggregates for Eco-Efficient Boards and Panels: Screening Tests of Physical Properties and Bio-Susceptibility

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