Development of recycled strain-hardening cement-based composite (SHCC) for sustainable infrastructures
Development of recycled strain-hardening cement-based composite (SHCC) for sustainable infrastructures
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DOI：
10.1016/j.compositesb.2011.11.060
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发表时间：
2012-03-01
影响因子：
13.1
通讯作者：
Kim, Sun-Woo
中科院分区：
文献类型：
--
作者：
Choi, Won-Chang;Yun, Hyun-Do;Kim, Sun-Woo
本文介绍了利用再生材料开发可持续应变硬化水泥基复合材料（SHCC）的实验结果。SHCC具有良好的力学性能，包括应变硬化和延展性。然而，SHCC是由硅砂和大量水泥组成的，这使得它比传统混凝土更耗能。本研究的目的是通过使用回收材料，促进SHCC在基础设施设计中的可持续性。在SHCC样品中，可选择的再生材料——砂、粉煤灰和聚对苯二甲酸乙二醇酯（PET）纤维——分别部分取代硅砂、水泥和聚乙烯醇（PVA）纤维。通过压缩试验、四点弯曲（弯曲）试验和单轴拉伸试验，研究了再生材料对SHCC试件力学性能的影响。然后在本构模型中使用基本信息来分析和设计使用再生材料的SHCC基础设施。试验结果表明，粉煤灰的加入提高了PVA纤维与水泥基体界面的化学键强度，提高了SHCC的弯曲性能和单轴拉伸性能。然而，由于PET纤维的材料性能较差，含PET纤维的SHCC在弯曲和单轴拉伸试验中表现不佳，尽管其压缩性能与PVA2.0试样相似。此外，由于再生砂比硅砂粒度更大，因此增加了SHCC的弹性模量值。根据本研究得出的结论，为了保持良好的SHCC性能，粉煤灰替代率低于20%或再生砂替代率低于50%被认为是创造可持续SHCC的合适选择。(C) 2011 Elsevier Ltd.版权所有。
This paper presents the experimental results of an attempt to develop sustainable strain-hardening cement-based composite (SHCC) using recycled materials. SHCC exhibits desirable mechanical properties, including strain hardening and ductility. However, SHCC is composed of silica sand and a high volume of cement, which makes it more energy intensive than conventional concrete. The aim of this study is to promote SHCC sustainability in infrastructure design through the use of recycled materials. Alternative recycled materials - sand, fly ash, and polyethylene terephthalate (PET) fibers - are used to partially replace silica sand, cement, and polyvinyl alcohol (PVA) fibers, respectively, in SHCC specimens. The effects of the recycled materials on the mechanical behavior of the SHCC specimens are examined by conducting compressive tests, four-point bending (flexural) tests, and uniaxial tensile tests. Fundamental information is then used in the constitutive model to analyze and design infrastructures using SHCC with recycled materials. Test results indicate that fly ash improves both the bending and uniaxial tensile performance of SHCC due to an increase in chemical bond strength at the interface between the PVA fibers and cement matrices. However, SHCC that contains PET fibers does not perform well in the bending and uniaxial tensile tests due to the inferior material properties of the PET fibers, although its compressive behavior is similar to that of the PVA2.0 specimen. Also, it is noted that recycled sand increases the elastic modulus value of SHCC due to its larger grain size compared to that of silica sand. Based on the desire to maintain well-performing SHCC, a replacement ratio below 20% for fly ash or below 50% for recycled sand is deemed appropriate for creating sustainable SHCC, as concluded from this study. (C) 2011 Elsevier Ltd. All rights reserved.