University of Oulu

Alzaza, A.; Mastali, M.; Kinnunen, P.; Korat, L.; Abdollahnejad, Z.; Ducman, V.; Illikainen, M. Production of Lightweight Alkali Activated Mortars Using Mineral Wools. Materials 2019, 12, 1695.

Production of lightweight alkali activated mortars using mineral wools

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Author: Alzaza, Ahmad1; Mastali, Mohammad1; Kinnunen, Paivo1;
Organizations: 1Fibre and Particle Engineering, Faculty of Technology, University of Oulu, 90014 Oulu, Finland
2National Building and Civil Engineering Institute, Dimičeva ulica 12, SI-1000 Ljubljana, Slovenia
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 10.4 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2019
Publish Date: 2019-10-10


This experimental study aimed to develop a fiber-reinforced lightweight mineral wool-based alkali activated mortar. The lightweight mineral wool-based alkali activated mortars were produced using premade foam and reinforced by polypropylene (PP) fibers. They were assessed in terms of fresh and hardened-state properties. Fresh-state properties were investigated by mini-slump tests. Hardened-state characteristics were assessed by ultrasonic pulse velocity, dry density, compressive and flexural strengths, drying shrinkage, efflorescence, water absorption, and permeable porosity. For the first time, the resistance of the synthesized lightweight mineral wool-based alkali activated mortars against harsh conditions (carbonation, freeze and thaw, and high temperature) were evaluated. The porous structures of the developed lightweight alkali activated mortars were also analyzed using an X-ray micro-computed tomography (CT) technique. Lightweight mix compositions with densities in a range of 770–1510 kg/m3, compressive strengths of 1–9 MPa, and flexural strengths of 2.6–8 MPa were developed. Increases in both density and strength after carbonation were also recorded, while a decrease of strength was noticed after exposure to freeze/thaw and high temperatures of up to 500 °C.

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Series: Materials
ISSN: 1996-1944
ISSN-E: 1996-1944
ISSN-L: 1996-1944
Volume: 12
Issue: 10
Article number: 1695
DOI: 10.3390/ma12101695
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: This research was funded by ERAMIN2/Business, grant number “24302797”.
Copyright information: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (