RILEM TC 294-MPA:纤维增强粉状高炉渣基碱活化混凝土力学性能的实验室间研究

IF 3.9 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Arkamitra Kar, Pujitha Ganapathi Chottemada, Lucija Hanžič, J. S. Kalyana Rama, Patricia Kara De Maeijer, Behzad Nematollahi, Kruthi Kiran Ramagiri, Laura Rossi, Aljoša Šajna, Shizhe Zhang, Mingzhong Zhang, Guang Ye, Frank Dehn
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引用次数: 0

摘要

根据RILEM技术委员会294-MPA的指示,本出版物报告了一项实验室间研究的结果,该研究测试了纤维增强的基于ggfs的碱活化混凝土(FRAAC),参与者来自比利时、印度和斯洛文尼亚。阐述了基于ggbf的FRAAC抗拉劈裂强度的预测模型。该研究在2020年至2024年期间努力寻找一种全球可复制的FRAAC混合物,该混合物可以达到所需的机械强度和可加工性标准。实验室间研究的主要目标是在不使用高效减水剂的情况下生成FRAAC,以保持S4级的稠度坍落度,并达到所需的28天立方体抗压强度40 MPa。通过实验室间的反复研究,确定钢纤维和PVA纤维分别以0.3和0.1%的体积分数掺入基于ggbf的AAC混合料中。实验程序测试了这些FRAAC组合在不同龄期(1 ~ 720天)下的抗压和抗拉劈裂强度。研究结果表明,虽然力学性能在实验室间存在一些差异,但所有参与者的FRAAC结果是一致的。使用钢纤维和聚乙烯醇纤维的基于ggfs的FRAAC,在28天内达到了理想的40 MPa的抗压强度。尽管含有钢纤维的FRAAC表现出更高的早期抗压强度,但含有钢纤维的FRAAC和含有PVA的FRAAC均表现出约61 MPa的720天抗压强度。添加钢纤维的FRAAC混合料的拉伸劈裂强度比添加PVA纤维的混合料高约30%。然而,在所有龄期,两种FRAAC混合料的抗拉劈裂强度均明显高于2 MPa。这些结果支持可靠和一致的实验结果,暗示FRAAC作为传统波特兰水泥混凝土的可持续替代品。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
RILEM TC 294-MPA: interlaboratory study of the mechanical properties of fiber-reinforced ground granulated blast furnace slag-based alkali-activated concrete

Under the directives of the RILEM Technical Committee 294-MPA, this publication reports on the findings of an interlaboratory study that tested fiber-reinforced GGBFS-based alkali-activated concrete (FRAAC), with participants from Belgium, India and Slovenia. The research also elaborates prediction models for the tensile splitting strength of GGBFS-based FRAAC. This research endeavoured between 2020 and 2024 to find a globally reproducible FRAAC mix that could attain the required mechanical strength and workability criteria. The primary goal of the interlaboratory study was to generate FRAAC without the use of superplasticizers in order to maintain an S4 class consistency slump and achieve the desired 28-days cube compressive strength of 40 MPa. Steel and PVA fibers were determined to be incorporated to the GGBFS-based AAC mix at 0.3 and 0.1% volume fractions, respectively, through iterative interlaboratory investigations. Experimental program was conducted to examine the compressive and tensile splitting strength of these FRAAC combinations at different curing ages, ranging from 1 to 720 days. The findings indicate that while there were a few interlaboratory variations in the mechanical properties, the FRAAC produced was uniform across all participants. The desired compressive strength of 40 MPa was attained by GGBFS-based FRAAC with both steel and PVA fibers at 28 days. Although FRAAC containing steel fibers exhibited the higher early compressive strength, FRAAC prepared with steel and FRAAC prepared with PVA both demonstrated a 720-days compressive strength of about 61 MPa. The FRAAC mixes with steel fiber additions exhibited a tensile splitting strength that was approximately 30% higher than the mix with PVA fibers. Nonetheless, at all ages, the tensile splitting strength of both FRAAC mixes was clearly higher than 2 MPa. These results support reliable and consistent experimental findings, which allude towards FRAAC as a sustainable substitute for conventional Portland cement concrete.

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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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