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Facile synthesis of graphene from waste tire/silica hybrid additives and optimization study for the fabrication of thermally enhanced cement grouts
Sabanci University, Turkey.
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.
Cimsa Cimento Sanayi AS, Turkey.
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2020 (English)In: Molecules, ISSN 1420-3049, E-ISSN 1420-3049, Vol. 25, no 4, article id 886Article in journal (Refereed) Published
Abstract [en]

This work evaluates the effects of newly designed graphene/silica hybrid additives on the properties of cementitious grout. In the hybrid structure, graphene nanoplatelet (GNP) obtained from waste tire was used to improve the thermal conductivity and reduce the cost and environmental impacts by using recyclable sources. Additionally, functionalized silica nanoparticles were utilized to enhance the dispersion and solubility of carbon material and thus the hydrolyzable groups of silane coupling agent were attached to the silica surface. Then, the hybridization of GNP and functionalized silica was conducted to make proper bridges and develop hybrid structures by tailoring carbon/silica ratios. Afterwards, special grout formulations were studied by incorporating these hybrid additives at different loadings. As the amount of hybrid additive incorporated into grout suspension increased from 3 to 5 wt%, water uptake increased from 660 to 725 g resulting in the reduction of thermal conductivity by 20.6%. On the other hand, as the concentration of GNP in hybrid structure increased, water demand was reduced, and thus the enhancement in thermal conductivity was improved by approximately 29% at the same loading ratios of hybrids in the prepared grout mixes. Therefore, these developed hybrid additives showed noticeable potential as a thermal enhancement material in cement-based grouts. © 2020 by the authors.

Place, publisher, year, edition, pages
MDPI AG , 2020. Vol. 25, no 4, article id 886
Keywords [en]
Graphene nanoplatelet, Grouts, Hybridization, Silanization, Thermal conductivity, Waste tire
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-44117DOI: 10.3390/molecules25040886Scopus ID: 2-s2.0-85079559489OAI: oai:DiVA.org:ri-44117DiVA, id: diva2:1396875
Note

Funding details: Horizon 2020, 727583; Funding text 1: This project is supported by Horizon 2020 project of GEOCOND. The grant number is 727583. This project is supported by Horizon 2020 project of GEOCOND. The grant number is 727583.

Available from: 2020-02-26 Created: 2020-02-26 Last updated: 2020-02-26Bibliographically approved

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