Design of bespoke lightweight cement mortars containing waste expanded polystyrene by experimental statistical methods
File(s)
Accepted version
Author(s)
Ferrandiz, V
Sarabia, LA
Ortiz, MC
Cheeseman, CR
Garcia-Alcocel, E
Type
Journal Article
Abstract
This work assesses the reuse of waste expanded polystyrene (EPS) to obtain lightweight cement mortars. The factors and interactions which affect the properties of these mortars were studied by ad-hoc designs based on the d-optimal criterion. This method allow multiple factors to be modified simultaneously, which reduces the number of experiments compared with classical design. Four factors were studied at several levels: EPS type (two levels), EPS content (two levels), admixtures mix (three levels) and cement type (three levels). Two types of aggregate were also studied. The workability, air content, compressive strength, adhesive strength, bulk density and capillary absorption were experimentally tested. The effect of factors and interactions on the properties was modelled and analysed. The results demonstrate how the factors and synergistic interactions can be manipulated to manufacture lightweight mortars which satisfy the relevant EU standards. These mortars contain up to 60% of waste EPS, low amounts of admixtures and low clinker content CEM III. Sustainable mortars containing silica sand gave flow table spread values between 168 and 180 ± 4 mm, bulk density between 1280
and 1110 ± 100 kg/m³, and C90 between 0.279 and 0.025 ± 0.07 kg/m²·min⁰′⁵, making them suitable for masonry, plastering and rendering applications.
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and 1110 ± 100 kg/m³, and C90 between 0.279 and 0.025 ± 0.07 kg/m²·min⁰′⁵, making them suitable for masonry, plastering and rendering applications.
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Date Issued
2015-10-22
Date Acceptance
2015-10-11
Citation
Materials & Design, 2015, 89, pp.901-912
ISSN
0261-3069
Publisher
Elsevier
Start Page
901
End Page
912
Journal / Book Title
Materials & Design
Volume
89
Copyright Statement
© 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Subjects
Lightweight mortar
Recycling
Expanded polystyrene
Fitted design
Statistical methods
Publication Status
Published