Non-contact photopyroelectric approach for complete thermal characterization of porous building materials

The building sector is known to have a significant environmental impact, considering that it is the largest contributor to global greenhouse gas emissions of around 36% and is also responsible for about 40% of global energy consumption. Of this, about 50% takes place during the building operational phase, while around 10–20% is consumed in materials manufacturing, transport and building construction, maintenance, and demolition. Increasing the necessity of reducing the environmental impact of buildings has led to enhancing not only the thermal performances of building materials, but also the environmental sustainability of their production chains and waste prevention. As a consequence, novel thermo-insulating building materials or products have been developed by using both locally produced natural and waste/recycled materials that are able to provide good thermal performances while also having a lower environmental impact. In this context, the aim of this work is to provide a detailed analysis for the thermal characterization of recycled materials for building insulation. To this end, the thermal behavior of different materials representing industrial residual or wastes collected or recycled using Sardinian zero-km locally available raw materials was investigated, namely: (1) plasters with recycled materials; (2) plasters with natural fibers; and (3) building insulation materials with natural fibers. Results indicate that the investigated materials were able to improve not only the energy performances but also the environmental comfort in both new and in existing buildings. In particular, plasters and mortars with recycled materials and with natural fibers showed, respectively, values of thermal conductivity (at 20 °C) lower than 0.475 and 0.272 W/(m⋅K), while that of building materials with natural fibers was always lower than 0.162 W/(m⋅K) with lower values for compounds with recycled materials (0.107 W/(m⋅K)). Further developments are underway to analyze the mechanical properties of these materials.

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A User-Friendly Tool to Characterize the Moisture Transfer in Porous Building Materials: FLoW1D

Applied Sciences ◽

10.3390/app10155090 ◽

2020 ◽

Vol 10 (15) ◽

pp. 5090

Author(s):

Virginia Cabrera ◽

Rubén López-Vizcaíno ◽

Ángel Yustres ◽

Miguel Ángel Ruiz ◽

Enrique Torrero ◽

...

Keyword(s):

Building Materials ◽

Moisture Transfer ◽

Estimation Of Parameters ◽

Microsoft Excel ◽

Porous Building Materials ◽

Visual Basic For Applications ◽

Conventional Tests ◽

User Friendly ◽

Santa Maria

This paper presents a user-friendly tool—FLoW1D (One-Dimensional Water Flow)—for the estimation of parameters that characterize the unsaturated moisture transfer in porous building materials. FLoW1D has been developed in Visual Basic for Applications and implemented as a function of the well-known Microsoft Excel© spreadsheet application. The aim of our work is to provide a simple and useful tool to improve the analysis and interpretation of conventional tests for the characterization of the hygric behavior of porous building materials. FLoW1D embraces the conceptual model described in EN 15026 for moisture transfer in building elements, and its implementation has been verified and validated correctly. In order to show the scope of the code, an example of an application has been presented. The hygric characterization of the limestone that is mostly employed in the Cathedral of Santa Maria and San Julian in Cuenca (Spain) was conducted based on an analysis of the conventional water absorption by capillarity tests (EN 15801).

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Thermal Characterization of Innovative Sustainable Building Materials from Wool Textile Fibers Waste

TECNICA ITALIANA-Italian Journal of Engineering Science ◽

10.18280/ti-ijes.632-423 ◽

2019 ◽

Vol 63 (2-4) ◽

pp. 277-283 ◽

Cited By ~ 1

Author(s):

C. Rubino ◽

M. Bonet-Aracil ◽

S. Liuzzi ◽

F. Martellotta ◽

P. Stefanizzi

Keyword(s):

Building Materials ◽

Thermal Characterization ◽

Sustainable Building ◽

Textile Fibers ◽

Wool Textile ◽

Sustainable Building Materials

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Hygrothermal Characterization of Porous Building Materials-Experiment Research on Isothermal Sorption and Capillary Problem

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.418-420.944 ◽

2011 ◽

Vol 418-420 ◽

pp. 944-949 ◽

Cited By ~ 1

Author(s):

Shui Yu ◽

Xu Zhang

Keyword(s):

Building Materials ◽

Capillary Condensation ◽

Moisture Sorption ◽

Building Envelope ◽

Mold Growth ◽

Porous Building Materials ◽

Capillary Problem ◽

Hygrothermal Environment ◽

High Humidity Environment

The research on water vapor isothermal sorption of porous building materials have an important function on controlling and solving hygrothermal problems, such as durability, thermal insulation, mold growth and indoor air quality, when building materials are in hygrothermal environment, especially in the high humidity environment. The isothermal sorption is used to describe the maximum moisture sorption capacity, if moisture content exceeds the limitation, probably there will be liquid water appearance, which lead to the risk of mold growth, decreasing durability and increasing thermal conductivity, and so on. The classic testing method of isothermal sorption could be found in ASTM Standards C 1498-01. In this paper, the eco-stucco, eco-fiber batt and eco-fiber board is tested using traditional method. Meanwhile, pore size distribution and capillary condensation is analyzed which is challenge for the design basis of hygrothermal character for the building envelope.

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Developing New Insulation Building Materials Based on Clay and Ecological Additives

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.b7590.019320 ◽

2020 ◽

Vol 9 (3) ◽

pp. 885-890

Keyword(s):

Building Materials ◽

Thermal Characterization ◽

Clay Material ◽

X Ray Diffraction ◽

Mass Fractions ◽

Key Factor ◽

Clay Matrix ◽

Biocomposite Material ◽

Remarkable Reduction

The thermal performance of exterior walls is considered as a key factor to improving energy efficiency in buildings, especially in areas with cold climates in winter and warm climates in summer. As part of this study, and whose building materials are known for their low thermal properties. The X-ray diffraction was performed on the clay material and the different fibers in order to determine their crystallinity. An experimental characterization of thermophysical properties of a new biocomposites material for the sustainable buildings construction in southern Morocco is presented. These materials can be used as mortar for ceilings and exterior walls. To this end, several samples were prepared from clay extracted from the Errachidia region (south-east Morocco) and three mass fractions of alfa, fig and reed fibers (20%, 40% and 60%). The thermal characterization method adopted is that of the highly insulated thermal house. The results revealed that the incorporation of alfa, fig and reed fibers into the clay matrix allowed a remarkable reduction in apparent density and thermal conductivity. This result shows the interest of using this biocomposite material in construction buildings to ensure thermal comfort and reduce greenhouse gas emissions.

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Hot Plate Method with Two Simultaneous Temperature Measurements for Thermal Characterization of Building Materials

International Journal of Thermophysics ◽

10.1007/s10765-017-2217-7 ◽

2017 ◽

Vol 38 (6) ◽

Cited By ~ 2

Author(s):

Sibiath O. G. Osséni ◽

Clément Ahouannou ◽

Emile A. Sanya ◽

Yves Jannot

Keyword(s):

Building Materials ◽

Thermal Characterization ◽

Temperature Measurements ◽

Hot Plate ◽

Plate Method

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Thermal and Physico-Mechanical Characterization of Paraíba’s State Soils to Applying in Soil-Cement Bricks

Materials Science Forum ◽

10.4028/www.scientific.net/msf.591-593.532 ◽

2008 ◽

Vol 591-593 ◽

pp. 532-536 ◽

Cited By ~ 1

Author(s):

Crislene Rodrigues da Silva Morais ◽

Marcelo Rodrigues Leite ◽

Luciana de Figueiredo L. Lucena ◽

Railda Shelsea T. Rocha do Nascimento

Keyword(s):

Building Materials ◽

Thermal Characteristics ◽

Decisive Role ◽

Thermal Characterization ◽

Additional Time ◽

Soil Cement ◽

Three Samples ◽

Production Techniques ◽

Negative Impacts

Soils play a decisive role in the manufacture of building materials, especially, tiles and bricks. Production techniques cause negative impacts on the environment and add additional time to the production process. Three samples obtained from Paraíba State were characterized by thermal characterization, granulometric and physical-mechanical techniques. Thermal analysis was undertaken in two different atmospheres, at a flow rate of 110 ml/min and a heating rate of 10oC/min. Evaluation of the soils through their thermal characteristics for use in soil-cement bricks production is elucidated.

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Mechanical and thermal characterization of compact blocks made of clayey earth with wood ashes addition

MATEC Web of Conferences ◽

10.1051/matecconf/202030701030 ◽

2020 ◽

Vol 307 ◽

pp. 01030

Author(s):

Gbénondé Sèna Gladys Milohin ◽

Sènouhoua Victor Gbaguidi ◽

André Donnot ◽

Malahimi Anjorin ◽

Riad Benelmir

Keyword(s):

Building Materials ◽

Variable Mass ◽

Thermal Characteristics ◽

Thermal Characterization ◽

Mechanical Tests ◽

Thermal Tests ◽

Hot Strip ◽

Simple Compression ◽

French Association

The objective of this study is to evaluate the influence of wood ashes on the mechanical and thermal characteristics of the clayey earth-ashes compound (CEAC) compressed blocks. Variable mass percentages of 0% to 60% of wood ashes were incorporated to clayey earth stabilized with 10% of cement. The physical characteristics of the clayey earth were determined according to the protocols of the french association of normalization. The manufactured blocks were subjected to mechanical tests: simple compression and tensile by bending. The thermal conductivity was then appreciated by the method of the hot strip. The blocks made with a mixture of “90% clayey earth” and “10% cement”, usually used in construction in Benin, served as a reference material. From the results obtained, it appears that the clayey earth used is a soil A2ts: fine clayed sand in a very dry state. The results of the mechanical and thermal tests show that for an addition of wood ashes between 10% and 20% by weight, the performances of the blocks are significantly improved. The CEAC blocks formulated from 80% of the mixture “90% of clayey earth and 10% of cement” and 20% of wood ashes can be used as building materials.

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