Development of cork–gypsum composites for building applications

Olivares, Francisco Hernández; Bollati, M; Rı́o, M. Del; Parga-Landa, B.

doi:10.1016/s0950-0618(99)00021-5

Cited by 166 publications

(53 citation statements)

References 3 publications

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“…After a bibliographic and document search on the subject, several studies have been found incorporating expanded clay additions in gypsum compounds-getting to reduce the gypsum density by 20%, in the best cases [10]-expanded polystyrene granules [11] or cork [12], reducing the density by 50%. Also, other researchers are working with other light loads from building construction and demolition waste (CDW) as cellular glass [13] or expanded and extruded polystyrene [14,15].…”

Section: Review On Lightenedmentioning

confidence: 99%

Analysis of the Relationship between Density and Mechanical Strength of Lightened Gypsums: Proposal for a Coefficient of Lightening

Astorqui

Merino

Sáez

et al. 2017

Advances in Materials Science and Engineering

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This article develops a relationship between the reduction of density in lightened gypsum and the addition of expanded and/or extruded polystyrene waste from the construction sector and their mechanical behavior. The equations determined in this study allow us to know the flexural and compressive strengths of a lightened gypsum/plaster compound once its density is known. The results show that there is an exponential relationship between the density of the compound and its strength. The methodology followed included a compilation of the results obtained in previous research works on lightweight gypsums, analyzing the relationship between density and mechanical strength and comparing them with the equations developed in this research. The results obtained by previous researchers have a good adjustment with the proposed models, and only perlite compounds present greater deviations in the compressive strength analysis. Also, a dimensionless lightening coefficient is defined which can help to determine the best application for a lightweight gypsum compound, comparing it with an ideal lightweight gypsum.

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Section: Review On Lightenedmentioning

confidence: 99%

Analysis of the Relationship between Density and Mechanical Strength of Lightened Gypsums: Proposal for a Coefficient of Lightening

Astorqui

Merino

Sáez

et al. 2017

Advances in Materials Science and Engineering

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“…Nowadays Hernández-Olivares et al [14] used cork granules with the size under 12 mm. Materials with the 20% of cork filler had bulk density about 800 kg/m 3 and very favourable compressive strength about 5 MPa.…”

Section: Natural Fillersmentioning

confidence: 99%

Lightweight Gypsum Based Materials: Methods of Preparation and Utilization

Doleželová¹,

Krejsová²,

Vimmrová³

2017

Int. J. SDP

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Although gypsum is one of the most environmentally friendly building binders, its use in the buildings is relatively limited and therefore the broadening of the gypsum product portfolio is desirable. One possibility is the development of the lightweight gypsum materials with better thermal insulation properties, attractive acoustic properties and also lower transportation costs. The lightweight gypsum materials can be used in a similar way as an aerated autoclaved concrete (AAC), whose energy consumption at production is several times higher.The main methods of the preparation of gypsum-based lightweight materials are described and compared. Gypsum can be lightened indirectly by the lightweight filler or directly. In the directly lightened materials, the pores are introduced into the gypsum material either by some chemical reaction producing gas or by the help of surface active substances. For the chemical lightening a large scale of waste products can be used. Lightening by the help of waste stone powder is described in detail. The materials with the properties comparable with the properties of AAC were prepared. Their bulk density was under 600 kg/m 3 , compressive strength was about 2 MPa and coefficient of thermal conductivity was under 0.2 W/m.K.Lightweight gypsum materials can be used as a thermal insulating blocks, for the lightweight gypsum boards, partitions blocks, lightweight fire-resistant plasters or thermal-insulating plasters.

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“…Cyclic shift tests were performed by Wu [6] in order to investigate the effect of reinforcement continuity on GFRG wall shifts behaviours. Mechanical properties, acoustic absorption properties and thermal conductivity of cork-gypsum composites are investigated by HernandezOliveras et al [7] experimentally. Eve et al [8] examined the mechanical behaviour and microstructure of plaster composites containing polyamide fibre.…”

Section: Introductionmentioning

confidence: 99%

Impact resistance of gypsum board subjected to low velocity impact

2017

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Original scientific paper The aim of this study was to investigate the impact resistance and damage behaviour of gypsum and composite gypsum boards subjected to low velocity impact. Low velocity impact tests were performed on four different board materials which can be listed as gypsum boards, gypsum+75 gr/m² mesh boards, gypsum+wallpaper boards and gypsum+75 gr/m² mesh+wallpaper boards. Indenter used in the impact tests was 24 mm in diameter and has semi spherical tip geometry. Gypsum and composite gypsum boards were bonded in 500×400 mm sizes and simply supported at four sides. Various energy levels, i.e. 2, 4, 6, 8, 10 and 12 J were applied to the centre of each board. As a result of low speed impact tests, impact force-time and force-displacement variations were obtained and the damaged regions of the samples were examined. Penetration thresholds and perforation thresholds of gypsum and composite gypsum board samples were determined by using Energy Profile Method (EPM). The effect of adding mesh and wallpaper into the gypsum board on stab and puncture limits was evaluated. Around 62.40 % increase occurred on gypsum+mesh+wallpaper board comparing to gypsum board in perforation thresholds. Keywords: EPM method; impact resistance; gypsum board; low velocity impact Otpornost na udar gipsane ploče izložene udaru male brzineIzvorni znanstveni članka Cilj ovoga rada je istražiti otpornost na udar i ponašanje kod oštećenja gipsanih i složenih gipsanih ploča izloženih udaru male brzine. Ispitivanja udara male brzine provedenu su na četiri različita materijala ploča, i to gipsane ploče, gips+75 gr/m² mrežaste ploče, ploče od gipsa+zidna tapeta i ploče od gipsa+75 gr/m² mreže+tapeta. Udubljenje korišteno u udarnim ispitivanjima bilo je 24 mm u promjeru i geometrije polu kuglastog tipa. Gipsane i složene gipsane ploče bile su spojene u veličinama od 500×400 mm i jednostavno pridržavane na četiri strane. Na sredinu svake ploče djelovalo se energijom različitih razina: 2, 4, 6, 8, 10 i 12 J. Kao rezultat ispitivanja udara male brzine, dobivene su varijacije udarna sila-vrijeme i sila-pomak te su ispitivana oštećena područja uzoraka. Granice penetracije i granice perforacije uzoraka gipsanih i složenih gipsanih ploča određene su EPM metodom (Energy Profile Method). Procijenio se učinak dodavanja mreže i tapete u gipsanu ploču na granice izdržljivosti kod udaranja i probijanja. Na ploči od gipsa+mreža+tapeta došlo je do porasta granice perforacije od oko 62.40 % u usporedbi s gipsanom pločom.

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Development of cork–gypsum composites for building applications

Cited by 166 publications

References 3 publications

Analysis of the Relationship between Density and Mechanical Strength of Lightened Gypsums: Proposal for a Coefficient of Lightening

Analysis of the Relationship between Density and Mechanical Strength of Lightened Gypsums: Proposal for a Coefficient of Lightening

Lightweight Gypsum Based Materials: Methods of Preparation and Utilization

Impact resistance of gypsum board subjected to low velocity impact

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