变形与再生轮胎钢纤维单组分碱活化渣混凝土力学性能对比研究

IF 6.5 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Ali Abdulkarim, Hossein Tajmir Riahi, Abdolreza Ataei
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引用次数: 0

摘要

在建筑行业寻找工业废物解决方案的重要性在追求环境保护方面发挥着至关重要的作用。为了减少碳足迹,这项研究的重点是开发解决方案。本研究对采用一组分活化剂制备的水固化碱活化渣混凝土(AASC)的力学性能进行了评价,其中干碱活化剂在加水前与矿渣预混合。然后用三种类型的钢纤维,即变形钢纤维(DSF),再生轮胎钢纤维(RTSF)和混合钢纤维(HSF)以不同的体积分数(0.5 %,0.75 %和1.0 %)增强混合钢纤维。许多特性,包括工作性,抗压强度,抗弯强度,劈裂抗拉强度,抗弯韧性,短期的SEM观察,以及单轴压缩下的应力-应变响应,弹性模量,峰值应变和长期的能量吸收进行了评估。试验结果表明,纤维掺入对抗压强度影响不大,当DSF体积为1 % (DSF1)时,28天抗压强度最高(58.51 MPa)。相反,RTSF的最佳抗压强度为0.5 %体积。另一方面,混凝土的劈裂、拉伸和抗弯强度随着钢纤维的加入而增加,在1 % DSF时达到最大值。钢纤维的加入将单组分AASC混合料的应力-应变响应从脆性转变为延性,与参考相比,1 %体积(HSF1)的HSF试件的峰值应力相关应变增加了50 %。值得注意的是,与参考混合物相比,HSF1混合物在365天的韧性增加了421 %。28 d DSF1和365 d HSF1的能量吸收能力最高。总体而言,1 % DSF、RTSF和HSF纤维的加入增强了单组分AASC的机械性能,其中DSF在28天的改善最为显著。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparative study of mechanical properties of one-part alkali-activated slag concrete using deformed and recycled tire steel fibers
The significance of finding industrial waste solutions in the construction industry plays a crucial role in the quest for environmental conservation. To reduce the carbon footprint, this research has focused on developing solutions. This study assesses the mechanical properties of water-cured alkali-activated slag concrete (AASC) prepared using a one-part activator, where the dry alkali activator is pre-mixed with slag before water addition. The mix is then reinforced with three types of steel fibers, namely deformed steel fibers (DSF), recycled tire steel fiber (RTSF), and hybrid steel fiber (HSF) at varying volume fractions (0.5 %, 0.75 %, and 1.0 %). Numerous characteristics, including workability, compressive strength, flexural strength, splitting tensile strength, flexural toughness, and SEM observations in short-term, and stress-strain response under uniaxial compression, modulus of elasticity, peak strain and energy absorption in long-term were assessed. According to the test results, compressive strength was largely unaffected by fiber addition, with DSF at 1 % volume (DSF1) achieving the highest strength (58.51 MPa at 28 days). Conversely, optimal compressive strength for RTSF was observed at 0.5 % volume. On the other hand, the concrete mixes' splitting tensile, and flexural strengths increased with the addition of steel fibers achieving maximum values at 1 % DSF. The addition of steel fibers transformed the stress-strain response of one-part AASC mixes from brittle to ductile, with HSF specimens at 1 % volume (HSF1) exhibiting a 50 % increase in strain related to peak stress compared to the reference. Remarkably the HSF1 mix achieved a 421 % increase in toughness at 365 days compared to the reference mix. The DSF1 mix at 28 days and HSF1 at 365 days achieved the highest energy absorption capacity. Overall, the inclusion of 1 % DSF, RTSF, and HSF fibers enhanced the mechanical properties of one-part AASC, with DSF providing the most significant improvements at 28 days.
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来源期刊
CiteScore
7.60
自引率
19.40%
发文量
842
审稿时长
63 days
期刊介绍: Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.
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