Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Characterization and nano-engineering the interface properties of PVA fibers in strain-hardening cementitious composites incorporating high-volume ground-glass pozzolans
Graphical abstract Display Omitted
Highlights The use of glass powder (GP) increases packing density and frictional bond ( 0). Too high packing density leads to excessive 0 and premature rupture in PVA fibers. Premature fiber rupture reduces composite ductility. Nanocellulose filaments (CF) attenuate 0 and impart noticeable slip-hardening (β). Improved β by CF increases fiber bridging capacity and composite ductility.
Abstract In the context of enhancing concrete ecoefficiency through the valorization of domestic materials into concrete design, increasing research attention is being paid to the development of strain-hardening cementitious composites (SHCC) with various supplementary cementitious materials (SCM) in replacement of the commonly used fly ash (FA). In this regard, ground-glass pozzolans [or simply glass powder (GP)] obtained by grinding post-consumer waste glass can shape a potential candidate. This study is aimed at characterizing the interface properties of polyvinyl-alcohol (PVA) fibers in SHCC incorporating high-volume GP (HVGP) at 0–100% replacement of FA. Single-fiber pull-out tests were conducted to characterize the interface properties [frictional bond ( 0), chemical bond (Gd), and slip-hardening coefficient (β)] necessary for micromechanical tailoring of SHCC. Results indicate that with higher matrix compactness obtained using GP, increased significantly, while Gd slightly decreased. Whereas higher in HVGP-SHCC was found to increase the maximum pull-out load of PVA fibers, excessive causes fiber damage, thereby adversely affecting composite ductility. Therefore, a novel approach was adopted herein to nanomodify SHCC matrix as well as fiber/matrix interface by incorporating nanoscale cellulose filaments (CF) at rates of 0.03–0.10% per cement mass. This allowed to significantly alter the pull-out behavior whereby and Gd were relatively attenuated, while a significant increase in β (~1.0–1.5) was obtained. Thus, the incorporation of CF imparted a characteristic slip-hardening effect that contributed towards enhancing the strain-hardening capacity in HVGP-SHCC as experimentally validated by uniaxial tensile tests.
Characterization and nano-engineering the interface properties of PVA fibers in strain-hardening cementitious composites incorporating high-volume ground-glass pozzolans
Graphical abstract Display Omitted
Highlights The use of glass powder (GP) increases packing density and frictional bond ( 0). Too high packing density leads to excessive 0 and premature rupture in PVA fibers. Premature fiber rupture reduces composite ductility. Nanocellulose filaments (CF) attenuate 0 and impart noticeable slip-hardening (β). Improved β by CF increases fiber bridging capacity and composite ductility.
Abstract In the context of enhancing concrete ecoefficiency through the valorization of domestic materials into concrete design, increasing research attention is being paid to the development of strain-hardening cementitious composites (SHCC) with various supplementary cementitious materials (SCM) in replacement of the commonly used fly ash (FA). In this regard, ground-glass pozzolans [or simply glass powder (GP)] obtained by grinding post-consumer waste glass can shape a potential candidate. This study is aimed at characterizing the interface properties of polyvinyl-alcohol (PVA) fibers in SHCC incorporating high-volume GP (HVGP) at 0–100% replacement of FA. Single-fiber pull-out tests were conducted to characterize the interface properties [frictional bond ( 0), chemical bond (Gd), and slip-hardening coefficient (β)] necessary for micromechanical tailoring of SHCC. Results indicate that with higher matrix compactness obtained using GP, increased significantly, while Gd slightly decreased. Whereas higher in HVGP-SHCC was found to increase the maximum pull-out load of PVA fibers, excessive causes fiber damage, thereby adversely affecting composite ductility. Therefore, a novel approach was adopted herein to nanomodify SHCC matrix as well as fiber/matrix interface by incorporating nanoscale cellulose filaments (CF) at rates of 0.03–0.10% per cement mass. This allowed to significantly alter the pull-out behavior whereby and Gd were relatively attenuated, while a significant increase in β (~1.0–1.5) was obtained. Thus, the incorporation of CF imparted a characteristic slip-hardening effect that contributed towards enhancing the strain-hardening capacity in HVGP-SHCC as experimentally validated by uniaxial tensile tests.
Characterization and nano-engineering the interface properties of PVA fibers in strain-hardening cementitious composites incorporating high-volume ground-glass pozzolans
Hisseine, Ousmane A. (Autor:in) / Tagnit-Hamou, Arezki (Autor:in)
10.10.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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