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The sound speed and attenuation in loose and consolidated granular formulations of high alumina cements
Department of Civil and Environmental Engineering, University of Bradford.
Department of Civil and Environmental Engineering, University of Bradford.
Laboratory of Building Materials Technology, Faculty of Engineering and Architecture, Helsinki University of Technology, Espoo.ORCID iD: 0000-0001-6287-2240
2003 (English)In: Applied Acoustics, ISSN 0003-682X, E-ISSN 1872-910X, Vol. 64, no 2, p. 197-212Article in journal (Refereed) Published
Abstract [en]

Clinkers of high alumina cements are separated into three granular formulations with particle sizes in the range 0.6-0.71 mm, 0.71-1.18 mm and greater than 1.18 mm. These are used to manufacture consolidated samples of porous concrete in an autoclave. The acoustic and microscopic properties of loose and consolidated porous samples of concrete are investigated using both experimental methods and mathematical modelling. Values of porosity, flow resistivity, tortuosity and parameters of the pore size distribution are determined and used to predict closely the sound speed, acoustic attenuation and normal incidence absorption coefficient of these materials. It is shown that high alumina cements do not require additional binders for consolidation and that the structural bonds in these cements are developed quickly between individual clinkers in the presence of water. The hydration product build-up during the consolidation process is insignificant which ensures good acoustic performance of the consolidated samples resulting from a sufficient proportion of the open pores. The value of porosity in the consolidated samples was found to be around 40%, which is close to that measured in some commercial acoustic absorbers. This work provides a foundation for the development of acoustically efficient and structurally robust materials, which can be integrated in environmentally sustainable concrete and masonry structures. © 2002 Elsevier Science Ltd. All rights reserved.

Place, publisher, year, edition, pages
2003. Vol. 64, no 2, p. 197-212
Keywords [sv]
Acoustic absorption, Cementitious materials, Granular media, Sound propagation
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-3368DOI: 10.1016/S0003-682X(02)00069-5Scopus ID: 2-s2.0-0037290147Local ID: 130c63a9-b858-44dd-b31b-0737b0e6535aOAI: oai:DiVA.org:ltu-3368DiVA, id: diva2:976226
Note

Upprättat; 2003; 20160222 (andcwi)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-08-20Bibliographically approved

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Cwirzen, A.

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