Thermal conductivity and compressive strength of expanded perlite aggregate concrete with mineral admixtures

Demirboğa, Ramazan; Gül, Rüstem

doi:10.1016/j.enbuild.2003.09.002

Cited by 122 publications

(51 citation statements)

References 8 publications

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“…The current knowledge of the expanded vermiculite [17][18][19][20][21], expanded perlite [22,23], and microspheres [24,25] proves their higher thermal resistance when compared to the cellulose based unmodified materials [11,12]. The exothermic effect for the commercial cellulose sample and the experimental #1 one is connected with the occurrence of microspheres which, to a certain temperature level, behave as an admixture improving the insulation ability of the mixture, whereas after exceeding the limit temperature they trigger exothermal effects [12,15,16].…”

Section: Resultsmentioning

confidence: 99%

Expanded Perlite, Expanded Vermiculite and Microspheres as Fillers in New Generation Paper Pulp Mixtures Used for Contact With Liquid Metal

Zawieja¹,

Sawicki²

2015

Adv. Sci. Technol. Res. J.

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Liquid metal when filling sand casting mould while pouring it out from ladle at the first moment comes across the sprue/gate system of the mould the purpose of which is to transfer liquid metal and feed the mould recess. The materials presently used for the elements of the sprue/gate systems are based on ceramics or the mixtures based on paper pulp. In this study the use of alternative mineral additions such as expanded perlite, expanded vermiculite, and microspheres as the fillers to paper pulp acquired from waste-paper for the use for the elements of mould sprue/gate systems or also other applications for the contact with liquid metal are presented. Experimental mould tube shapes made on the basis of the paper pulp based mixture patented by the authors were poured over with liquid metal. For the comparison, ceramic shapes and commercially available cellulose shapes were investigated in the same way. In order to compare the crystallization processes, a measurement of the cooling off liquid metal was carried out for all the analysed tube samples. From the so obtained metal samples metallographic microsections were made to compare cast iron microstructures. The results obtained from the investigations carried out have shown that the patented paper pulp based mixture may well be applied as an alternative material used for the elements of the sprue/gate systems for disposable sand moulds.

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Section: Resultsmentioning

confidence: 99%

Expanded Perlite, Expanded Vermiculite and Microspheres as Fillers in New Generation Paper Pulp Mixtures Used for Contact With Liquid Metal

Zawieja¹,

Sawicki²

2015

Adv. Sci. Technol. Res. J.

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“…They systematically reviewed the production and properties of the LWA, the production technique and properties of LWAC, including microstructure, physical properties, durability, fire resistance and applications of the LWAC. Demirboga and Gul [10] investigated the thermal conductivity and compressive strength of expanded perlite aggregate concrete with mineral admixtures. They reported that silica fume and fly ash as replacement for cement can decrease the thermal conductivity up to 15%, but the density and compressive strength of the concrete is also reduced, up to 30%.…”

Section: Introductionmentioning

confidence: 99%

Development of cement-based lightweight composites – Part 1: Mix design methodology and hardened properties

Spiesz

Brouwers

2013

Cement and Concrete Composites

133

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a b s t r a c tThis article aims at the development of durable cement-based lightweight aggregate composites, with a good balance between the thermal and mechanical properties. The mixtures are developed with the optimized packing applying the modified Andreasen and Andersen model, to obtain the optimal target grading curve of all the solids in the mixture. A lightweight material produced from recycled glass is used as the lightweight aggregates (LWA) in order to obtain the desired low thermal conductivity.The properties of the designed composites, including the flowability and relative viscosity in fresh state, and the porosity, strength and thermal properties in hardened state are investigated. The porosity of the developed composites is studied by both modeling and experiments. Results indicate that there is a certain amount of closed internal LWA pores in the composites, which contributes positively to a better thermal insulation property. The developed composites have a low thermal conductivity while still retaining sufficient strength. Therefore, the designed composite can be used monolithically as both load-bearing element and thermal insulator.

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“…As shown in scanning electron microscope (SEM) pictures in Figures 1 and 2, the majority pores in EVSB are closed unlike NEPP. 3 The hygroscopic sorption characteristics of NEPP and EVSB are given in Figure 3. The particle size distribution and physical characteristics of the lightweight aggregates (NEPP and EVSB) are shown in Tables 3 and 4, respectively.…”

Section: Lightweight Aggregatesmentioning

confidence: 99%

“…Lightweight aggregates, such as expanded perlite and pumice, are often used in cement mortars or concretes in China and other counties in Asia and Middle East [1][2][3][4][5][6][7][8][9]. The lightweight inert cenospheres, produced in coal-fired power plants, are also ideal lightweight aggregates because of their hollow-sphere structures comprised largely of silica and alumina and filled with inert air and/or gases [10].…”

Section: Introductionmentioning

confidence: 99%

Sorption and Thermal Properties of Insulating Mortars with Expanded and Vitrified Small Ball

Mitchell¹,

Link²,

Fang

et al. 2011

Journal of Testing and Evaluation

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Sorption and thermal properties of insulating mortars with expanded and vitrified small ball (EVSB)Ping, F.; Mukhopadhyaya, P.; Kumaran, M. K.; Shi, C.http://www.nrc-cnrc.gc.ca/irc Sorpt ion a nd t he rm a l prope rt ie s of insula t ing m ort a rs w it h e x pa nde d a nd vit rifie d sm a ll ba ll (EV SB) NRCC-54004Ping, F.; Mukhopadhyaya, P.; Kumaran, M.K.; Shi, C. March 2011A version of this document is published in / Une version de ce document se trouve dans: Testing and Evaluation, 39, (2), pp. 1-32, March 01, 2011 The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42 ASTM Journal ofLes renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples renseignements : http://lois.justice.gc.ca/fr/showtdm/cs/C-42 Sorption and Thermal Properties of Insulating Mortars with Expanded and Vitrified Small Ball (EVSB)Ping Fang 1* , Phalguni Mukhopadhyaya 2 , Kumar Kumaran 2 , Caijun Shi 1 , ABSTRACT:Expanded vitrified small hollow ball (EVSB), made from a special type of perlite mineral is one of the recently developed materials in China. It is widely used as a cementitious thermal insulating mortar for building envelope construction in hot-humid areas of southern China. However, EVSB is a porous material sensitive to environmental moisture. The thermal insulating property of the EVSB mortar is dependent on its moisture transport and storage characteristics. In this study, hygroscopic sorption properties of EVSB mortars have been investigated, in comparison with those of normal expanded perlite particle (NEPP) mortars. The BET specific surface area and the BJH pore size distribution, as well as the SEM micro-morphologies of the mortars were assessed. It was observed that EVSB mortars had lower moisture sorption capacity than NEPP mortars when the relative humidity (RH) was higher than 70% because of its lower total pore volume. The addition of water-repellent admixtures in the mortar decreased the moisture sorption capacity of EVSB mortars but still maintains the same physisorption isothermal characteristics. It is also evident that the thermal conductivity values of both NEPP and EVSB mortars increased rapidly when RH is above 90%. However, the increase rate of thermal conductivity of NEPP mortars was apparently higher than that of EVSB mortars. It is hoped that finding from this study will help to develop a better understanding of the in-situ thermal performance of EVSB mortar used for the building envelope construction in...

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Thermal conductivity and compressive strength of expanded perlite aggregate concrete with mineral admixtures

Cited by 122 publications

References 8 publications

Expanded Perlite, Expanded Vermiculite and Microspheres as Fillers in New Generation Paper Pulp Mixtures Used for Contact With Liquid Metal

Expanded Perlite, Expanded Vermiculite and Microspheres as Fillers in New Generation Paper Pulp Mixtures Used for Contact With Liquid Metal

Development of cement-based lightweight composites – Part 1: Mix design methodology and hardened properties

Sorption and Thermal Properties of Insulating Mortars with Expanded and Vitrified Small Ball

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