Non-Stationary Identification of Thermal Characteristics of Building Materials

2011 ◽  
pp. 277-283
Author(s):  
J. Vala ◽  
S. Šťastník
Keyword(s):  
Building Materials ◽  
Thermal Characteristics

scholarly journals Aportes para el análisis comparativo del comportamiento higrotérmico y mecánico de los materiales de construcción con tierra

2019 ◽  
Vol 22 (1) ◽  
Author(s):  
María Guadalupe Cuitiño-Rosales ◽  
Rodolfo Rotondaro ◽  
Alfredo Esteves
Keyword(s):  
Building Materials ◽  
Thermal Characteristics ◽  
Mechanical Resistance ◽  
Secondary Sources ◽  
Earth Construction ◽  
Palabras Clave ◽  
Concrete Blocks ◽  
Vernacular Building ◽  
Natural Building ◽  
Earth Block

Resumen Se analizan las características térmicas y de resistencias mecánicas de materiales y elementos constructivos elaborados con suelos naturales estabilizados. La metodología parte de la recopilación bibliográfica de fuentes primarias, secundarias e información de ensayos propios, sobre la densidad, la conductividad térmica y las resistencias a la compresión, a la flexión y al corte correspondientes al adobe, los bloques de tierra comprimida (BTC), la tapia y la quincha, según diferentes autores. Además, se consideraron los valores establecidos por normas argentinas IRAM referidas al acondicionamiento térmico de edificios. Se elaboraron comparaciones entre sí y con algunos materiales industrializados, tales como los bloques de hormigón, los ladrillos cerámicos huecos y los ladrillos cocidos macizos. A partir de este análisis, se concluyó que la revisión bibliográfica no es suficiente para obtener una estandarización de los valores de conductividad y transmitancia térmica de los materiales y los elementos constructivos naturales. Así mismo, a partir de las comparaciones de valores se pudo observar cómo se relacionan la densidad de los materiales y la de los morteros, según las distintas técnicas, con el comportamiento térmico y las resistencias mecánicas. Palabras clave: Adobe; arquitectura sostenible; bahareque; bloque de tierra comprimida-BTC; materiales vernáculos de construcción; propiedades térmicas; quincha; resistencia mecánica; tapial   Comparative analysis of the thermal aspects and mechanical resistances for materials and elements of earth construction Abstract The thermal characteristics and mechanical resistance of some materials and constructive elements elaborated with stabilized natural soils are analyzed. The methodology took into account the bibliographic compilation of primary and secondary sources and information from own tests, on density, thermal conductivity and resistance to compression, flexion and cutting, corresponding to adobe, BTC, tapia and wattle and daub, according to different authors. In addition, it was considered the values established by Argentine standards IRAM referring to the thermal conditioning of buildings. Comparisons were made with each other and with some industrialized materials such as concrete blocks, hollow ceramic bricks, and solid fired bricks. From this analysis, it was concluded that the literature review is not enough to obtain a standardization conductivity and thermal transmittance values of natural building materials and elements. Furthermore, from the comparisons of values it was possible to observe how the density of materials and mortars, according to the different techniques, are related to thermal behavior and mechanical resistance. Keywords: Adobe; sustainable architecture; bahareque; compressed earth block (BTC); vernacular building materials; thermal properties; quincha; mechanical strength; tapial; wattle; daub   Recibido: octubre 22 / 2018  Evaluado: septiembre 10 / 2019  Aceptado: octubre 15 / 2019 Publicado en línea: noviembre de 2019                               Actualizado: noviembre de 2019

scholarly journals Investigation of the mechanical and thermal characteristics of an eco-insulating material made of plaster and date palm fibers

2021 ◽  
Vol 16 (2) ◽  
pp. 55-66
Author(s):  
Mokhtar Rachedi ◽  
Abdelouahed Kriker
Keyword(s):  
Building Materials ◽  
Date Palm ◽  
Bending Strength ◽  
Mechanical Performance ◽  
Negative Impact ◽  
Low Cost ◽  
Natural Fibers ◽  
Thermal Characteristics ◽  
Chemical Degradation ◽  
Date Palm Fibers

Abstract The negative impact of the production and use of building materials on the environment has become evident, so in recent decades, to find more sustainable, eco-friendly, and low-cost materials, the last research tends to reconsider the use of natural fibers and traditional building materials. This paper aims to develop a bio-composite based on the southern Algerian region's local materials consisting mainly of plaster and waste from date palm trees. Many properties were examined experimentally through previous research of our team (physical, mechanical, and microstructure characteristics) [1, 2] to characterize these materials. Several samples of bio-composite of plaster configurations with short length (20mm) and eight-weight ratios (0.5% - 4%) of palm fibers were prepared for mechanical, thermal, and physical characterizations. In addition, tested all previous properties on the specimens after 28 days of curing in normal conditions. The results show a clear improvement in the bio-composites mechanical performance (an increase in the bending strength with achieving compressive strength) and their thermal properties, which have been well developed (density, thermal conductivity, and specific heat capacity). To enhance the resistance of palm fibers to chemical degradation in the plaster's alkaline environment and improve the adhesion between them, these fibers were treated with a NaOH solution of 1% concentration. The plaster's composites reinforced with date palm fibers can be qualified as eco-friendly and thermal insulation building materials.

scholarly journals Thermal Characteristics of New Building Materials and their Effect upon the Energy Efficiency

2008 ◽  
Vol 45 (3) ◽  
pp. 3-13
Author(s):  
J. Ekmanis ◽  
V. Zebergs ◽  
N. Zeltins ◽  
V. Vrublevski
Keyword(s):  
Energy Efficiency ◽  
Heat Capacity ◽  
Thermal Resistance ◽  
Energy Supply ◽  
Heat Supply ◽  
Building Materials ◽  
Thermal Characteristics ◽  
Thermal Inertia ◽  
Extreme Conditions

Thermal Characteristics of New Building Materials and their Effect upon the Energy Efficiency The paper formulates the role of thermal inertia of the building materials in the energy supply of buildings and in solution of the energy efficiency problems. The evolution of construction entails the application of new building materials as well as of glazed surfaces in the envelopes of buildings. An analysis is made of the influence of the thermal resistance of building materials and their heat capacity on the thermal inertia indicators of buildings. An inertia scale of buildings has been developed for the choice of the heat supply capacities of buildings at low outdoor temperatures under extreme conditions of the Latvian climate. The ratio of the ventilation capacities has been analysed in the total heating balance at a low thermal inertia of buildings. The significance of innovative ventilation technologies for raising the energy efficiency has been considered.

scholarly journals Predictive model of the dependence of the cost of insulation on thermal characteristics

2019 ◽  
Vol 140 ◽  
pp. 04018
Author(s):  
Olga Gamayunova ◽  
Anton Radaev ◽  
Mikhail Petrichenko ◽  
Raimond Bogdanivics
Keyword(s):  
Thermal Conductivity ◽  
Mathematical Model ◽  
Predictive Model ◽  
Building Materials ◽  
Thermal Characteristics ◽  
Average Density ◽  
Coefficient Of Determination ◽  
The Cost ◽  
Selection Of

In the market of building materials today there is a large selection of various thermal insulation materials, differing in cost, thermal conductivity and other characteristics. This article describes the predictive model of the cost of insulation from thermal characteristics, such as: thickness, thermal conductivity, (average) density, water absorption and combustibility group. The coefficient of determination was used to assess the quality of the obtained economic-mathematical model. The described predictive model can be effectively used to solve problems associated with determining the optimal characteristics of insulation by the criterion of minimizing cost.

Gypsum Composite Boards Incorporating Phase Change Materials: A Review

2021 ◽  
Vol 21 (4) ◽  
pp. 2269-2277
Author(s):  
Lucian-Cristian Pop ◽  
Mihaela Baibarac ◽  
Ion Anghel ◽  
Lucian Baia
Keyword(s):  
Fatty Acid ◽  
Phase Change ◽  
Building Materials ◽  
Phase Change Materials ◽  
Thermal Characteristics ◽  
Carbonaceous Material ◽  
Fatty Acid Esters ◽  
Graphite Nanosheets ◽  
Wide Range ◽  
Acid Esters

The purpose of this review is to provide an overview of the available gypsum based composite including various phase change materials employed to increase the thermal energy storage capacity of building materials. A wide range of materials such as n-alkane, saturated fatty acid, fatty acid esters etc are used as phase change materials. Adding carbonaceous material (carbon nanofibers, activated nanocarbon, graphite nanosheets etc.) to augment some properties is also a common practice. In addition, there are presented the methods of obtaining the nano/macro-composites together with some thermal characteristics of the newly prepared materials.

scholarly journals Influence of the Expandable Graphite on the Thermal properties of a Rigid Polyurethane Foam for construction

2021 ◽  
Vol 263 ◽  
pp. 01009
Author(s):  
Lenar Shafigullin ◽  
Natalya Romanova ◽  
Gulnaz Shafigullina ◽  
Yulia Sokolova
Keyword(s):  
Thermal Properties ◽  
Building Materials ◽  
Thermal Characteristics ◽  
Polyurethane Foams ◽  
Expandable Graphite ◽  
Gravimetric Analysis ◽  
Effective Prevention ◽  
Char Layer ◽  
Stage Process ◽  
Acid Catalyzed

In this paper, low-combustible composites were made by adding 0.8-25 wt% of expandable graphite to rigid polyurethane foams (PUF) to ensure effective and safe usage of building materials made of PUFs. Thermal gravimetric analysis (TGA) was used to study thermal properties and effectiveness of the resulting low-combustible composites in construction. The analysis of TGA curves of the studied composites can be interpreted as a two-stage process: acid-catalyzed degradation of PUF and formation of an intumescent char layer. A dense intumescent layer can provide an effective prevention of heat transfer. The paper showed that the addition of 25 wt% of expandable graphite to PUF composite improved the thermal stability by 8 °С, as compared to starting PUF, while the residue was 36.2 wt% at 600°С, which was higher by approximately 16 wt% than the residue of starting PUF. So, the sample with 25 % loading of expandable graphite in rigid PUF composite showed the best thermal characteristics.

scholarly journals Experimental Investigations on the Performances of Composite Building Materials Based on Industrial Crops and Volcanic Rocks

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 102 ◽  
Author(s):  
Raluca Iștoan ◽  
Daniela Roxana Tămaș-Gavrea ◽  
Daniela Lucia Manea
Keyword(s):  
Building Materials ◽  
Raw Materials ◽  
Fire Behavior ◽  
Volcanic Rocks ◽  
Thermal Characteristics ◽  
Experimental Investigations ◽  
New Materials ◽  
White Cement ◽  
Hemp Shiv ◽  
Indoor Comfort

Interdisciplinary and sustainability represent the main characteristics of this paper due to the fact that this research is offering a connection between two main areas—agronomy and construction, by using hemp shiv for the design of new building materials, which can increase the sustainability level of the building industry. For this reason, the main scope of this study is based on the investigation of a new category of composite building materials—lightweight mortars based on hemp shiv, volcanic rocks and white cement—which contribute to a positive environmental impact and help to increase indoor comfort. A complex report was carried out on two segments. The first one is focused upon the characteristics of the raw materials from the composition of the new materials, while the second segment presents a detailed analysis of these composites including morphological and chemical investigation, pyrolytic and fire behavior, compression and flexural strengths, and acoustic and thermal characteristics. The proposed recipes have as a variable volcanic rocks, while the hemp and the binder maintain their volumes and properties. The results were analyzed according to the influence of volcanic rocks on the new composites.

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

2008 ◽  
Vol 591-593 ◽  
pp. 532-536 ◽  
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.

scholarly journals CREATION OF 3D LIBRARIES OF DIGITAL COMPONENTS FOR THE MULTISTORY BUILDING MODEL

2020 ◽  
pp. 19-26
Author(s):  
M.A. Liubchenko ◽  
◽  
O.E. Mandrichenko ◽  
T.P. Demidenko ◽  
◽  
...  
Keyword(s):  
Construction Projects ◽  
Building Materials ◽  
Thermal Characteristics ◽  
Technical Requirements ◽  
Floor Slabs ◽  
Multistory Building ◽  
Interior Walls ◽  
Current Price ◽  
Key Indicators ◽  
Digital Components

Abstract. The article is dedicated to creation of 3D libraries of building construction elements with customized annotations, analytical and other necessary parameters for interior walls, doors, windows, exterior walls, floor slabs, roof, ceiling and floor elements in REVIT software. The aim of the work is to develop a database of families of parameterized components of buildings and structures in REVIT. The research was conducted using the method of generalization, systematic approach and statistical analysis. The matter of creating families of digital components of the virtual model of construction projects in accordance to the state norms and technical requirements is relevant now. Issues of creation and application of families of digital parameterized components according to requirements of current regulatory documents, interior and exterior components, as well as the structural component of each created element are described in the article. Some of the created families conform to the specified requirements, are universal and having an ability to replace types families. For each of the loaded element, the maximum possible number of materials was selected with the inclusion in the library of all the necessary information from physical and thermal characteristics to the current price of the building materials on the Ukrainian market. Practical use of the created libraries occurs in the design of construction projects in the framework of faculty and students cooperation with the Public Union «BUILDIT UKRAINE». The information model of a multistory civil building was created by the authors. The model allows to automatically generating the necessary drawings for construction: plans, facades, schemes, sections, design specifications and other documentation. Moreover, this reduces the time for preparation of project documentation and provides control of key indicators and compliance with the deadlines. Besides, the model allows to provide information on the results of researches and tests quickly, and promptly adjust the cost of construction.

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