Entwicklung eines Wärmedämmputzes mit Naturfasern und Untersuchung des Wärme‐ und Feuchteverhaltens

Hroudová, Jitka; Korjenić, Azra; Zach, Jiří; Mitterböck, Michael

doi:10.1002/bapi.201710030

Cited by 5 publications

(5 citation statements)

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“…The lowest porosity was reached by the reference mix and the highest by mixture with 1.5% SAP and 3% cellulose. Such results comply with previously published research papers [25][26][27]29] that studied these admixtures separately. The revealed modification correlates with characteristics of used admixtures by meaning their size, swelling capability (SAP), amount of used water, and powder density [38].…”

Section: Resultssupporting

confidence: 92%

“…Taking into account the mechanical strength issues associated with the utilization of SAPs in plasters, the application of reinforcing fibers can be viewed as a possible solution [27]. During recent decades, various types of fibers have been studied with partial success, including with regard to their mechanical strength and thermal and hygric parameters in particular [4,28,29]. Apart from synthetic fibers such as polypropylene, glass, and carbon fibers, a wide range of natural fibers have been investigated as environmentally friendly reinforcers.…”

Section: Introductionmentioning

confidence: 99%

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Combined Effect of Superabsorbent Polymers and Cellulose Fibers on Functional Performance of Plasters

2021

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Plaster has, from ancient times, been used as a decorative material. However, the advances in materials engineering such as thermal and moisture control provide new opportunities. Superabsorbent polymers (SAPs) have been found to possess passive moisture control that may find utilization in modern buildings. However, the main drawback is associated with a limited number of applicable SAPs due to mechanical strength loss. In this regard, concurrent utilization of cellulose fibers may provide additional benefits linked with the reinforcing of plaster structure and preservation of superior hygric properties. In this regard, this study investigates the combined effect of SAP and cellulose fibers on the material properties of cement-lime plaster in terms of its mechanic, thermal, and hygric properties. To access the capability of such modified plasters to control the interior moisture fluctuations, the moisture buffering value is determined. Obtained results show the effect of both applied admixtures on material performance, whilst the synergic effect was most obvious for humidity control accessed through the moisture buffer coefficient.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Combined Effect of Superabsorbent Polymers and Cellulose Fibers on Functional Performance of Plasters

2021

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“…The test specimens were loaded by lowering the central nose at a constant crosshead rate, which is determined by the geometry of the test specimen from (1). To calculate MOE and MOR for the samples according to (2) and (3), the maximum load reached during the test and the equivalent vertical deflection were recorded.…”

Section: Flexural Strength (Static Bending)mentioning

confidence: 99%

“…Sci. 2019, 9, 3878 2 of 20 ecological footprint, numerous studies on organic based insulation materials have already been carried out by researchers with materials such as sheep wool, straw, cotton, and flax for Austria and the Czech Republic [1][2][3]. Rice is the primary food for more than 40% of the world's population.…”

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confidence: 99%

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Rice Straw and Flax Fiber Particleboards as a Product of Agricultural Waste: An Evaluation of Technical Properties

et al. 2019

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Construction materials have a direct impact on the environment, on people, and their health. In addition, building insulation plays a decisive role in terms of energy consumption of buildings and regarding CO 2 -emissions over their whole life cycle. In order to achieve a holistic concept for green building worldwide, it is necessary to develop ecological insulating materials and to scientifically examine them in terms of their technical properties, as done with particleboards from agricultural waste presented in this article. This study aims to characterize the properties' tensile and compressive strength, modulus of rupture (MOR), and elasticity (MOE) and thermal conductivity of particleboards affected by parameters, such as waste type (rice straw or flax shives), particleboard density, resin type, and content, as well as the use of treated rice straw. Particleboards made from flax shives had superior properties compared to the rice straw particles. The mechanical properties of the boards increase with an increasing resin content, except for the MOR and MOE, which decrease with an increasing resin content, and reach their peak value at a resin content of 10%. Appl. Sci. 2019, 9, 3878 2 of 20 ecological footprint, numerous studies on organic based insulation materials have already been carried out by researchers with materials such as sheep wool, straw, cotton, and flax for Austria and the Czech Republic [1][2][3]. Rice is the primary food for more than 40% of the world's population. Every year, 596 million tons of rice are produced, resulting in 570 million tons of rice straw worldwide [4,5]. Currently, 12 million MTs of rice straw are produced yearly in Egypt [6]. This quantity is the reason why rice production has a high impact in Egypt and this rice straw, as a residue of this production, poses a serious problem for the farmers involved. Rice straw is conventionally cleaned, burned, or used for temporary heating purposes. This current practice causes serious environmental problems. But rice straw is a renewable resource that can be used as raw material for the production of insulated particleboard. A particleboard is a sheet product manufactured under pressure from particles of wood or other lignocellulose materials by adhesive [6]. With the increasing demand for particleboards, the demand to provide alternatives with renewable and ecological materials is accordingly growing. This research will use rice straw as alternative to fill this gap.The principal chemical composition of rice straw is 28-48% cellulose, 12-16% lignin, 15-20% ash, and 9-14 silica. The fiber length is between 0.4-3.4 mm with an average value of 1.4 mm, and the fiber width is from 4-16 mm, with an average value of 8 mm [7].Tong et al. [8] found that straw shows numerous positive properties, such as low density and a renewable nature. Rice straw is an annually renewable agricultural waste. Particleboard performance depends on the properties of adhesives and their compatibility with fibres. Several kinds of adhesive resins have been used...

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Moisture potental theory application for modelling of enclosing structure unsteady-state moisture regime

Zubarev

2019

Vestnik MGSU

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Introduction. Known calculation methods for enclosing structure unsteady-state moisture regime proposed by K.F. Fokin, are examined. The first one describes moisture transfer in a sorption zone, and another allows calculation in oversorption zone also. “Thermodynamic moisture potential” of enclosing structure materials introduced by V.N. Bogoslovsky is described. Moisture potential F developed by V.G. Gagarin and V.V. Kozlov is shown. The moisture potential F allows describing water vapor and liquid moisture movement in material in a consistent way. The scientific novelty of the study is the development of calculation method based on moisture potential F. Practical relevance of the study is the possibility to obtain performance humidity values of enclosing structure materials by means of calculations for engineering practice. Materials and methods. A moisture transfer equation is derived on the basis of process physical interpretation, A mathematical model, consisting of heat conductivity equation, derived moisture transfer equation, spatial-time domain, boundary and initial conditions, is formulated. Moisture potential in single-layer and multilayer enclosing structures is determined using finite difference method. Results. Calculations for four types of enclosing structures are made on the basis of the proposed mathematical model: single-layer aerated concrete wall; a wall made of aerated concrete masonry base and clay brick cladding; a wall made of aerated concrete masonry base and mineral wool insulation with thin plaster layer; a wall made of aerated concrete masonry base and expanded polystyrene insulation with thin plaster layer. Conclusions. Calculated performance humidity values of enclosing structure materials were lower than values stated in regulatory documents. The presented results allow to define building heat loss definition and heating system design more accurately. Specification data on maximum wetting plane position obtained earlier were proved within the framework of the developed theory: in enclosing structures with aerated concrete base and mineral wool insulation maximum moisture content is located at the joint of plaster and insulation layers; in enclosing structures with aerated concrete base and expanded polystyrene insulation maximum moisture content is located in the insulation layer. Acknowledgements. Authors are deeply indebted to V.V. Kozlov, PhD in Technical Sciences, and V.K. Akhmetov, Doctor of Engineering Science, Professor, for discussion and useful comment in the course of study.

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Entwicklung eines Wärmedämmputzes mit Naturfasern und Untersuchung des Wärme‐ und Feuchteverhaltens

Cited by 5 publications

References 24 publications

Combined Effect of Superabsorbent Polymers and Cellulose Fibers on Functional Performance of Plasters

Combined Effect of Superabsorbent Polymers and Cellulose Fibers on Functional Performance of Plasters

Rice Straw and Flax Fiber Particleboards as a Product of Agricultural Waste: An Evaluation of Technical Properties

Moisture potental theory application for modelling of enclosing structure unsteady-state moisture regime

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