Bond strength and flexural performance of repair composites incorporating nanofibrillated cellulose (NFC) modified mortar

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2024-12-10 DOI:10.1617/s11527-024-02534-4

Obinna Onuaguluchi, Shen Wang, Ricky Ratu, Nemkumar Banthia

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Abstract

This study investigates the influence of Plain and 0.1% NanoFibrillated Cellulose (NFC) modified repair mortar mixtures on the bond strength and flexural performance of composite and monolithic beam specimens. First, the effect of the NFC on the slant shear and flexural bond strength of repair mortar overlays was assessed. Thereafter, repair mortar thicknesses ranging from 25 to 50 mm were overlaid on concrete substrates, and flexural strength and toughness of specimens were evaluated. Furthermore, the effect of hybrid combination of the NFC and steel macro fiber on the flexural toughness and strain evolution of monolithic Fiber Reinforced Concrete (FRC and FRC + 0.1% NFC) beams were also evaluated. Test results showed that the NFC enhanced the slant shear and flexural bond strengths of repair mortar by about 35% and 43%, respectively. Flexural strength capacity of composite beams generally increased as the repair mortar thickness was raised from 25 to 50 mm. Relative to the single-layer FRC beam, concrete substrate overlaid with 50 mm thick Plain + 0.1% NFC mortar showed about 56% increase in flexural strength. However, a post-crack toughness superior to that of the single-layer FRC beam was only achieved using 25–35 mm thick Plain + 0.1% NFC repair mortar as overlays. Furthermore, with the combination of NFC and steel fiber as discrete reinforcements in FRC, the bending strength, static modulus and toughness of beams were also enhanced.

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含纳米纤化纤维素（NFC）改性砂浆修复复合材料的粘结强度和弯曲性能

本研究探讨了普通和0.1%纳米纤化纤维素（NFC）改性修补砂浆混合物对复合梁和单梁试件粘结强度和抗弯性能的影响。首先，评估了NFC对修补砂浆覆盖层斜剪和弯曲粘结强度的影响。随后，在混凝土基材上覆盖厚度为25 ~ 50 mm的修补砂浆，并对试件进行抗弯强度和韧性评估。此外，还评估了NFC和钢宏纤维混合组合对整体纤维增强混凝土（FRC和FRC + 0.1% NFC）梁的抗弯韧性和应变演化的影响。试验结果表明，NFC可使修复砂浆的斜剪强度和弯曲强度分别提高约35%和43%。当修补砂浆厚度从25 mm增加到50 mm时，复合梁的抗折能力普遍提高。与单层FRC梁相比，覆盖50 mm厚Plain + 0.1% NFC砂浆的混凝土基板抗弯强度提高约56%。然而，只有在25-35 mm厚的Plain + 0.1% NFC修补砂浆作为覆盖层时，其开裂后韧性才优于单层FRC梁。此外，NFC和钢纤维组合作为FRC的离散增强材料，也提高了梁的抗弯强度、静模量和韧性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.