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Modified Carboxymethylcellulose-Based Scaffolds as New Potential Ecofriendly Superplasticizers with a Retardant Effect for Mortar: From the Synthesis to the Application

  • This article is focused on the research and development of new cellulose ether derivatives as innovative superplasticizers for mortar systems. Several synthetic strategies have been pursued to obtain new compounds to study their properties on cementitious systems as new bio-based additives. The new water-soluble admixtures were synthesized using a complex carboxymethylcellulose-based backbone thatThis article is focused on the research and development of new cellulose ether derivatives as innovative superplasticizers for mortar systems. Several synthetic strategies have been pursued to obtain new compounds to study their properties on cementitious systems as new bio-based additives. The new water-soluble admixtures were synthesized using a complex carboxymethylcellulose-based backbone that was first hydrolyzed and then sulfo-ethylated in the presence of sodium vinyl sulphonate. Starting with a complex biopolymer that is widely known as a thickening agent was very challenging. Only by varying the hydrolysis times and temperatures of the reactions was achieved the aimed goal. The obtained derivatives showed different molecular weight (Mw) and anionic charges on their backbones. An improvement in shear stress and dynamic viscosity values of CEM II 42.5R cement was observed with the samples obtained with a longer time of higher temperature hydrolysis and sulfo-ethylation. Investigations into the chemical nature of the pore solution, calorimetric studies and adsorption experiments clearly showed the ability of carboxymethyl cellulose superplasticizer (CMC SP) to interact with cement grains and influence hydration processes within a 48-h time window, causing a delay in hydration reactions in the samples. The fluidity of the cementitious matrices was ascertained through slump test and preliminary studies of mechanical and flexural strength of the hardened mortar formulated with the new ecological additives yielded values in terms of mechanical properties. Finally, the computed tomography (CT) images completed the investigation of the pore network structure of hardened specimens, highlighting their promising structure porosity.show moreshow less

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  • Gefördert durch das Programm Open Access Publizieren der DFG und den Publikationsfonds der Bauhaus-Universität Weimar.

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Metadaten
Document Type:Article
Author: Clotilde Cappachione, Stephan PartschefeldGND, Prof. Dr.-Ing. Andrea OsburgORCiDGND, Rocco Gliubizzi, Carmine Gaeta
DOI (Cite-Link):https://doi.org/10.3390/ma14133569Cite-Link
URN (Cite-Link):https://nbn-resolving.org/urn:nbn:de:gbv:wim2-20210804-44689Cite-Link
URL:https://www.mdpi.com/1996-1944/14/13/3569
Parent Title (English):Materials
Publisher:MDPI
Place of publication:Basel
Language:English
Date of Publication (online):2021/07/30
Date of first Publication:2021/06/25
Release Date:2021/08/04
Publishing Institution:Bauhaus-Universität Weimar
Institutes and partner institutions:Fakultät Bauingenieurwesen / Professur Bauchemie und Polymere Werkstoffe
Volume:2021
Issue:volume 14, issue 13, article 3569
Pagenumber:17
First Page:1
Last Page:17
Tag:OA-Publikationsfonds2021
carboxymethylcellulose; mortar; superplasticizers
GND Keyword:Mörtel; Verflüssigung
Dewey Decimal Classification:600 Technik, Medizin, angewandte Wissenschaften / 660 Chemische Verfahrenstechnik
BKL-Classification:56 Bauwesen / 56.45 Baustoffkunde
Open Access Publikationsfonds:Open-Access-Publikationsfonds 2021
Licence (German):License Logo Creative Commons 4.0 - Namensnennung (CC BY 4.0)