Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Healing of Interface Between Polyvinyl Alcohol (PVA) Fiber and Cement Matrix
Abstract Polyvinyl alcohol (PVA) fiber-reinforced strain-hardening cementitious composites (SHCC) are able to maintain the fine crack widths under tension; and thus have demonstrated autogenous healing capability in the presence of water. The autogenous healing of PVA-SHCC leads to certain degree of mechanical recovery, which indicates the constitutive fiber-bridging across the crack may be strengthened. Fundamentally the fiber-bridging behavior is subject to the fiber/matrix interfacial bond. It is known that under tension PVA fiber/cement matrix bond could be weakened as the fiber chemically debonding from the matrix; however the potential autogenous healing at the debonded interface is never studied. The current study investigated the effect of water conditioning on the PVA fiber/cement matrix interface by conducting single-fiber pullout tests to the debonded-and-healed group and the control group. The testing results indicate that water conditioning did not restore the chemical bond between fiber and matrix, but it remarkably enhanced the frictional bond at the debonded interface.
Healing of Interface Between Polyvinyl Alcohol (PVA) Fiber and Cement Matrix
Abstract Polyvinyl alcohol (PVA) fiber-reinforced strain-hardening cementitious composites (SHCC) are able to maintain the fine crack widths under tension; and thus have demonstrated autogenous healing capability in the presence of water. The autogenous healing of PVA-SHCC leads to certain degree of mechanical recovery, which indicates the constitutive fiber-bridging across the crack may be strengthened. Fundamentally the fiber-bridging behavior is subject to the fiber/matrix interfacial bond. It is known that under tension PVA fiber/cement matrix bond could be weakened as the fiber chemically debonding from the matrix; however the potential autogenous healing at the debonded interface is never studied. The current study investigated the effect of water conditioning on the PVA fiber/cement matrix interface by conducting single-fiber pullout tests to the debonded-and-healed group and the control group. The testing results indicate that water conditioning did not restore the chemical bond between fiber and matrix, but it remarkably enhanced the frictional bond at the debonded interface.
Healing of Interface Between Polyvinyl Alcohol (PVA) Fiber and Cement Matrix
Qiu, Jishen (Autor:in) / Yang, En-Hua (Autor:in)
05.09.2017
7 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
| British Library Online Contents | 2016