Mechanical and Physical Properties of Straw Bales

Konečný, Petr; Teslík, Jiří; Hamala, Michal

doi:10.4028/www.scientific.net/amr.649.250

Cited by 12 publications

(9 citation statements)

References 2 publications

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“…The difference between straw and other conventional materials is related to its porosity and cellulose content which improve their thermal properties. Regarding mechanical properties, Konečný et al [41] and Ashour et al [42] conducted tests on several types of straw bales by applying a 10 kN load. They got elastic modulus between 150 and 350 kPa for density values between 83 kg/m 3 and 100 kg/m 3 which is very low compared to those of concrete of about 10-30 GPa [43].…”

Section: Straw Fibers and Balesmentioning

confidence: 99%

A Mini-Review on Straw Bale Construction

et al. 2022

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Straw bale building construction is attracting a revived public interest because of its potential for reduced carbon footprint, hygrothermal comfort, and energy savings at an affordable price. The present paper aims to summarize the current knowledge on straw bale construction, using available data from academic, industry, and public agencies sources. The main findings on straw fibers, bales, walls, and buildings are presented. The literature shows a wide variability of results, which reflects the diversity of straw material and of straw construction techniques. It is found that the effective thermal conductivity, density, specific heat, and elastic modulus of straw bales used in construction are in the range 0.033–0.19 W/(m·K), 80–150 kg/m3, 1075–2000 J/(kg·K), and 150–350 kPa respectively. Most straw-based multilayered walls comply with fire resistance regulations, and their U-value and sound reduction index range from 0.11 to 0.28 W/m2 K and 42 to 53 dB respectively, depending on the wall layout. When compared to standard buildings, straw bale buildings do provide yearly reductions in carbon emissions and energy consumption. The reductions often match those obtained after applying energy-saving technologies in standard buildings. The paper ends by discussing the future research needed to foster the dissemination of straw bale construction.

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Section: Straw Fibers and Balesmentioning

confidence: 99%

A Mini-Review on Straw Bale Construction

et al. 2022

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“…There have been attempts to numerically model straw structures using a simplified view based on empirical relationships and a phenomenological approach [25,30]. Therefore, it is necessary to thoroughly investigate the possibility of testing straw bale as the first type of load-bearing structure of houses [34], then evaluate the data obtained, analyse them using regression analysis, and use inverse analysis and numerical models to obtain unmeasurable parameters. The present research investigated two limiting testing situations-straw bale without side barrier and straw bale with side barrier.…”

Section: Motivation and Research Significantmentioning

confidence: 99%

Experimental Investigation of Two Test Setups on Straw Bales Used as Load-Bearing Elements of Buildings

et al. 2021

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The importance of green and sustainable materials in civil engineering is undeniable. Alongside modern practices that improve the properties of standard building materials, there are ways to revive forgotten techniques, including straw bale buildings. Straw bales are load-bearing structures, which are applied based on handed-down experience and lack standard approaches in testing, design, and application. Therefore, a goal ahead is to describe every aspect of the process in technical detail. The objective of this paper is to highlight practical ideas for testing straw bales on a hydraulic press machine and to provide a basic statistical investigation of the results obtained. Two basic series were prepared, one without a side barrier and the other with a side barrier. The reason for this was to delineate the limits of the real behaviour of the straw bale on the load bearing wall of the house. Due to the assumed slight embedment of adjacent bales, the real result were within these limits. The experimental plan, basic results, simplified correlations, and statistical evaluation are presented. Recommendations for a further testing and evaluation are provided. As expected, the results with and without the lateral barrier differ by almost 18% for the true strain.

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“…Zur Untersuchung des vertikalen Lastabtrags in Wänden aus hochverdichteten Strohballen sind zahlreiche experi mentelle Versuchsserien an verschiedenen Institutionen durchgeführt worden, die sich in Art und Geometrie der Probekörper, in Versuchsaufbau und Versuchsdurchfüh rung sowie in ihren Ergebnissen maßgeblich unterschei den [5][6][7][8]. Die Versuchsserien lassen sich dabei grund legend in zwei Kategorien einteilen:…”

Section: Vertikaler Lastabtragunclassified

Experimentelle Untersuchungen zum horizontalen Lastabtrag in aussteifenden Strohballenwänden

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Hoppe³

et al. 2021

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Strohballen als landwirtschaftliches Nebenprodukt bestehen aus nachwachsenden Rohstoffen, sind regional verfügbar, besitzen ausgezeichnete Dämmeigenschaften und können in hochverdichteter Form großen Beanspruchungen standhalten. Als lasttragende Elemente in Gebäuden des Wohn‐ und Gesellschaftsbaus sowie in landwirtschaftlichen Nutzbauten können sie zu einer Antwort auf die gestiegene Nachfrage nach ökologisch nachhaltigen Lösungen im Bauwesen beitragen. Während der vertikale Lastabtrag bereits Gegenstand mehrerer Forschungsarbeiten war, sind viele Fragen zur aussteifenden Wirkung von Strohwänden gegenüber Horizontallasten noch nicht geklärt. Als Grundlage für die Erarbeitung von Berechnungsmodellen zur realitätsnahen Abbildung des Last‐Verformungsverhaltens sowie zur Definition von Versagenszuständen und Grenzwiderständen ist eine solide experimentelle Datenbasis unerlässlich. In diesem Aufsatz werden Planung, Durchführung und Auswertung experimenteller Versuche zum horizontalen Lastabtrag in Wänden aus hochverdichteten Strohballen vorgestellt. Ziel der Untersuchungen ist ein besseres Verständnis des Last‐Verformungsverhaltens von in der Ebene belasteten Strohwänden. Die Auswertung basiert dabei auf dem Einsatz klassischer mechanischer sowie moderner optischer Messmethoden. Da die Untersuchung des Reibungsverbunds und des Einflusses von Auflasten im Mittelpunkt des Interesses steht, wird dabei bewusst auf den Einsatz mechanischer Verbundmittel verzichtet.

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Mechanical and Physical Properties of Straw Bales

Cited by 12 publications

References 2 publications

A Mini-Review on Straw Bale Construction

A Mini-Review on Straw Bale Construction

Experimental Investigation of Two Test Setups on Straw Bales Used as Load-Bearing Elements of Buildings

Experimentelle Untersuchungen zum horizontalen Lastabtrag in aussteifenden Strohballenwänden

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