Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-11555
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Main Title: The effects of nanosilica on the fresh and hardened properties of 3D printable mortars
Author(s): Sikora, Pawel
Chung, Sang-Yeop
Liard, Maxime
Lootens, Didier
Dorn, Tobias
Kamm, Paul H.
Stephan, Dietmar
Elrahman, Mohamed Abd
Type: Article
URI: https://depositonce.tu-berlin.de/handle/11303/12755
http://dx.doi.org/10.14279/depositonce-11555
License: https://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract: This study presents the experimental results of an investigation on the effects of nanosilica (NS) on the material characteristics of printable mortars used for additive manufacturing. Printable cement mortars based on Ordinary Portland Cement, limestone filler and silica sand were modified with different dosages of nanosilica (from 2% to 6% by weight of binder) and its influence on their hydration, rheological, mechanical and transport properties was assessed. The study showed that NS accelerates significantly the setting and hardening of printable mortar, while reducing its open time. Moreover, an increment of yield stress, together with an increment in NS dosage, was found to have occurred. The incorporation of an optimal NS dosage results in a noticeable increase in the compressive strength and alteration of the pore structure as determined by the MIP measurements. Moreover, transport properties of the produced mortar are significantly improved due to incorporation of NS. In addition to the microstructure refinement, Micro-CT and scanning electron microscopy (SEM) studies revealed that 3D printed mortars exhibit pore anisotropy in accordance with the printing direction. However, incorporation of NS in the mixture resulted in improved buildability, thus decreasing pore anisotropy.
Subject(s): 3D printing
mortar
nanosilica
micro-CT
hydration
fresh properties
hardened properties
Issue Date: 19-Feb-2021
Date Available: 9-Mar-2021
Language Code: en
DDC Class: 690 Hausbau, Bauhandwerk
Sponsor/Funder: EC/H2020/841592/EU/Ultra-Lightweight Concrete for 3D printing technologies/Ultra-LightCon-3D
Journal Title: Construction and Building Materials
Publisher: Elsevier
Volume: 281
Article Number: 122574
Publisher DOI: 10.1016/j.conbuildmat.2021.122574
EISSN: 1879-0526
ISSN: 0950-0618
TU Affiliation(s): Fak. 6 Planen Bauen Umwelt » Inst. Bauingenieurwesen » FG Baustoffe und Bauchemie
Appears in Collections:Technische Universit├Ąt Berlin » Publications

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