基于超细纤维的土工聚合物混凝土空心板在软冲击下的韧性特性

IF 0.8 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Journal of Testing and Evaluation Pub Date : 2024-07-01 DOI:10.1520/jte20230634

P. Bhuvaneshwari, Bodu Suchitra, Ramachandran Divya

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引用次数: 0

摘要

本研究旨在通过落锤冲击装置，对施加软冲击的空隙土工聚合物混凝土板进行实验和数值分析。使用土工聚合物混凝土浇铸了六块板（600 毫米 ×600 毫米 ×115 毫米）。其中两块浇注为实心板，其余四块浇注为空心板，以两种不同的模式放置直径为 70 毫米的球形空心模板。两种空隙成型器的模式分别为：70 毫米空隙成型器，间距 240 毫米；70 毫米空隙成型器，间距 120 毫米。在每种情况下，都在伴生试样中添加了体积分数为 1% 的微钢纤维。与实心板相比，空心板的自重分别减少了 6% 和 12.6%。软冲击是通过在一个制作好的软冲击试验架上从 0.457 米的高度释放一个 4.5 千克的钢球来实现的。使用分析系统（ANSYS）工作台对类似的软冲击试验进行了数值分析。参数分析表明，与纤维增强实心板相比，在 240 毫米处空隙为 70 毫米的纤维增强空隙板的抗冲击性有所增强。能量吸收、延展性指数和极限抗裂性的增强率分别为 34.05 %、55.26 % 和 9.68 %。纤维加固空隙板还具有经济性和可持续性，减少了二氧化碳排放，降低了能耗。

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Toughness Characteristics of Microfiber-Based Geopolymer Concrete Voided Slabs under Soft Impact

The present study aimed to experimentally and numerically analyze voided geopolymer concrete slabs applied with soft impact through a drop-hammer impact setup. Six slabs (600 mm ×600 mm × 115 mm) were cast using geopolymer concrete. Two were cast as solid slabs and the remaining four slabs were cast as voided slabs by placing a 70 mm diameter spherical void formers in two different patterns. Two patterns of void formers are followed as 70 mm void former at 240 mm spacing and 70 mm void former at 120 mm spacing. Micro steel fiber at a dosage of 1 % by volume fraction was added in companion specimens in each case. The placing of void former reduced the self-weight of the slabs by 6 % and 12.6 %, respectively, compared to solid slabs. The soft impact was achieved by releasing a 4.5 kg steel ball from a fall height of 0.457 m in a fabricated soft impact test frame. A similar soft impact test was accomplished numerically using the analysis system (ANSYS) workbench. Parametric analysis shows that when compared to fiber-reinforced solid slabs, the impact resistance of fiber-reinforced voided slabs with 70 mm void former at 240 mm was enhanced. The enhancement percentage for energy absorption, ductility index, and ultimate crack resistance were 34.05 %, 55.26 %, and 9.68 %, respectively. The fiber-reinforced voided slabs were also found to be economical and sustainable with reduced CO2 emission and embodied energy.

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来源期刊

Journal of Testing and Evaluation 工程技术-材料科学：表征与测试

CiteScore

2.30

自引率

8.30%

发文量

221

审稿时长

6.7 months

期刊介绍： This journal is published in six issues per year. Some issues, in whole or in part, may be Special Issues focused on a topic of interest to our readers. This flagship ASTM journal is a multi-disciplinary forum for the applied sciences and engineering. Published bimonthly, the Journal of Testing and Evaluation presents new technical information, derived from field and laboratory testing, on the performance, quantitative characterization, and evaluation of materials. Papers present new methods and data along with critical evaluations; report users'' experience with test methods and results of interlaboratory testing and analysis; and stimulate new ideas in the fields of testing and evaluation. Major topic areas are fatigue and fracture, mechanical testing, and fire testing. Also publishes review articles, technical notes, research briefs and commentary.