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首页> 外文期刊>Construction and Building Materials >Characterization and nano-engineering the interface properties of PVA fibers in strain-hardening cementitious composites incorporating high-volume ground-glass pozzolans
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Characterization and nano-engineering the interface properties of PVA fibers in strain-hardening cementitious composites incorporating high-volume ground-glass pozzolans

机译：大量掺入磨料玻璃火山灰的应变硬化水泥基复合材料中PVA纤维的界面特性和纳米工程

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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 (tau(0)), chemical bond (G(d)), and slip-hardening coefficient (beta)] necessary for micromechanical tailoring of SHCC. Results indicate that with higher matrix compactness obtained using GP, tau(0) increased significantly, while G(d) slightly decreased. Whereas higher tau(0) in HVGP-SHCC was found to increase the maximum pull-out load of PVA fibers, excessive tau(0) 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 tau(0) and G(d) were relatively attenuated, while a significant increase in beta(similar to 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. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在通过将家用材料增值到混凝土设计中来提高混凝土生态效益的背景下，越来越多的研究注意力转向开发使用各种补充胶凝材料（SCM）替代常用的粉煤灰的应变硬化水泥复合材料（SHCC）灰分（FA）。在这方面，通过研磨消费后的废玻璃而获得的毛玻璃火山灰[或简称为玻璃粉（GP）]可以形成潜在的候选物。这项研究的目的是表征SHCC中聚乙烯醇（PVA）纤维的界面特性，其中掺入高体积GP（HVGP），FA含量为0-100％。进行单纤维拉拔测试以表征SHCC的微机械剪裁所需的界面特性[摩擦键（tau（0）），化学键（G（d））和滑移硬化系数（β）]。结果表明，使用GP获得的更高的基质致密性，tau（0）显着增加，而G（d）略有下降。 HVGP-SHCC中较高的tau（0）被发现会增加PVA纤维的最大拉出载荷，而过度的tau（0）会导致纤维损坏，从而对复合材料的延展性产生不利影响。因此，本文采用新颖的方法通过以每水泥质量0.03-0.10％的比例掺入纳米级纤维素丝（CF）来纳米改性SHCC基质以及纤维/基质界面。这可以显着改变拔出行为，从而使tau（0）和G（d）相对衰减，同时获得显着增加的beta（类似于1.0-1.5）。因此，CF的掺入赋予了特征性的滑动硬化作用，该特征的滑动硬化作用有助于增强HVGP-SHCC中的应变硬化能力，如通过单轴拉伸试验实验证实的。 （C）2019 Elsevier Ltd.保留所有权利。

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