PSI - Issue 74

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 74 (2025) 17–24

© 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Libor Pantělejev © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Libor Pant ĕ lejev Keywords: lightweight concrete ; lightweight aggregate ; polystyrene granulate ; perlite ; expanded glass ; expanded clay ; sintered fly ash ; fine aggregate concrete ; thermal insulation ; thermal conductivity ; density; compressive strength. Abstract The aim of this paper is to assess the effect of lightweight aggregate type on thermal conductivity, density, moisture content, water absorption, compressive and flexural strength. Five lightweight composites, made of the following fine lightweight aggregates: polystyrene granules, perlite, expanded glass, expanded clay and sintered fly ash, and one reference normal-weight concrete were used in the research programme. The tested lightweight composites, due to the use of porous aggregates, high w/c ratio (0.8) and additional foaming admixture, were characterized by dry density (from 520 to 1070 kg/m 3 ) lower by as much as 46 ÷ 74% than the reference concrete. Such a significant reduction in the density of the tested composites resulted in relatively low compressive strength (2.9 - 7.3 MPa) and very low thermal conductivity coefficient (0.07 - 0.17 W/(m K)). In the case of insulating-structural concretes, for which lower thermal-insulation is required, the application of popular expanded clay or sintered fly-ash aggregate turned out to be significantly less effective in comparison to the concretes with the other lightweight aggregates. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Libor Pant ĕ lejev Keywords: lightweight concrete ; lightweight aggregate ; polystyrene granulate ; perlite ; expanded glass ; expanded clay ; sintered fly ash ; fine aggregate concrete ; thermal insulation ; thermal conductivity ; density; compressive strength. Eleventh International Conference on Materials Structure and Micromechanics of Fracture The effect of lightweight aggregate type on thermal conductivity and the other properties of insulating – structural fine-aggregate concretes Lucyna Domagała a * a Cracow University of Technology, ul. Warszawska 24, Cracow 30-212, Poland Abstract The aim of this paper is to assess the effect of lightweight aggregate type on thermal conductivity, density, moisture content, water absorption, compressive and flexural strength. Five lightweight composites, made of the following fine lightweight aggregates: polystyrene granules, perlite, expanded glass, expanded clay and sintered fly ash, and one reference normal-weight concrete were used in the research programme. The tested lightweight composites, due to the use of porous aggregates, high w/c ratio (0.8) and additional foaming admixture, were characterized by dry density (from 520 to 1070 kg/m 3 ) lower by as much as 46 ÷ 74% than the reference concrete. Such a significant reduction in the density of the tested composites resulted in relatively low compressive strength (2.9 - 7.3 MPa) and very low thermal conductivity coefficient (0.07 - 0.17 W/(m K)). In the case of insulating-structural concretes, for which lower thermal-insulation is required, the application of popular expanded clay or sintered fly-ash aggregate turned out to be significantly less effective in comparison to the concretes with the other lightweight aggregates. Eleventh International Conference on Materials Structure and Micromechanics of Fracture The effect of lightweight aggregate type on thermal conductivity and the other properties of insulating – structural fine-aggregate concretes Lucyna Domagała a * a Cracow University of Technology, ul. Warszawska 24, Cracow 30-212, Poland

* Corresponding author. Tel.: +48 12 628 23 63 E-mail address: lucyna.domagala@pk.edu.pl * Corresponding author. Tel.: +48 12 628 23 63 E-mail address: lucyna.domagala@pk.edu.pl

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Libor Pant ĕ lejev 2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Libor Pant ĕ lejev

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of Libor Pantělejev 10.1016/j.prostr.2025.10.028