Interface bonding properties of polyvinyl alcohol (PVA) fiber in alkali-activated slag/fly ash

被引：20
作者：
Zhang, Shizhe [1 ,2 ]
He, Shan [1 ]
Ghiassi, Bahman [3 ]
van Breugel, Klaas [1 ]
Ye, Guang [1 ]
机构：
[1] Delft Univ Technol, Fac Civil Engn & Geosci, Sect Mat & Environm, Microlab, Stevinweg 1, NL-2628 CN Delft, Netherlands
[2] Renewi Mineralz & Water, Vlasweg 12, NL-4782 PW Moerdijk, Netherlands
[3] Univ Birmingham, Sch Engn, Birmingham B15 2TT, England
来源：
CEMENT AND CONCRETE RESEARCH | 2023年 / 173卷
基金：
中国国家自然科学基金;
关键词：
Bonding; Interface; Fiber pullout; PVA; Alkali-activation; Slag; Fly ash; FLY-ASH; MICROSTRUCTURAL DEVELOPMENT; MECHANICAL-PROPERTIES; POLY(VINYL ALCOHOL); FRACTURE-BEHAVIOR; REACTION-KINETICS; SILICATE POWDER; CEMENT PASTE; STRENGTH; GEOPOLYMER;
D O I：
10.1016/j.cemconres.2023.107308
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This paper presents an experimental study on the interface bonding properties of polyvinyl alcohol (PVA) fiber in alkali-activated slag/fly ash (AASF) pastes. Three interface bonding properties (i.e., the chemical bonding energy Gd, the initial frictional bond strength tau(0), and slip-hardening behavior) were determined using single-fiber pullout tests. The microstructure and chemical composition of the reaction products in the fiber/matrix interfacial transition zone (ITZ) and the nearby matrix were also characterized to reveal the influence of PVA fiber to its surrounding matrix. It is found that G(d) increases primarily with increasing Ca/(Si+Al) ratio of C-(N-)A-S-H gel. Unlike that in cementitious materials, the inclusion of PVA fiber in AASF pastes promotes the formation of a high-Ca C-(N-)A-S-H phase rather than crystalline portlandite near the fiber surface. This study provides useful guidance for tailoring the interface bonding properties of AASF and also the development of high-performance composites such as strain-hardening geopolymer composites.
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页数：12
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