Effects of microfibre parameters on the tensile properties of fabric-reinforced cementitious mortar

IF 4.7 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2024-01-01 DOI:10.1177/15280837241227628

C. Dang, M. Pham, N. Dinh

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Abstract

In recent years, Fabric-Reinforced Cementitious Mortar (FRCM) has gained widespread application for strengthening reinforced concrete and masonry structures. This research investigated the influence of microfibre parameters on the tensile characteristics of FRCM, focusing on the fibre type, length, and volume fraction. Three distinct types of microfibres were scrutinized: amorphous metallic (AM) fibres, polyvinyl alcohol (PVA) fibres, and nylon fibres. FRCM coupons were designed and fabricated based on the AC434 standard. A tensile experimental program, following RILEM TC232-TDT, revealed the pronounced advantage of employing AM fibres in the pre-cracking stage by significantly improving the crack stress up to 226% and pre-cracking stiffness of FRCM. Conversely, synthetic fibres such as nylon and PVA were beneficial in the post-cracking stage by enhancing cracked stiffness, peak stress, and tensile toughness. Additionally, it was found that using fibres with shorter lengths improved the tensile behavior of FRCM composites in the post-cracking stage due to better random distribution in the cement-based matrix. Finally, an artificial neural network (ANN) model was proposed to predict the tensile parameters of the FRCM composites incorporating microfibres.

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微纤维参数对织物增强水泥基砂浆拉伸性能的影响

近年来，织物增强水泥基砂浆（FRCM）在加固钢筋混凝土和砌体结构方面得到了广泛应用。本研究调查了微纤维参数对 FRCM 拉伸特性的影响，重点是纤维类型、长度和体积分数。研究仔细观察了三种不同类型的微纤维：无定形金属（AM）纤维、聚乙烯醇（PVA）纤维和尼龙纤维。FRCM 试样是根据 AC434 标准设计和制造的。按照 RILEM TC232-TDT 进行的拉伸实验表明，在预开裂阶段使用 AM 纤维具有明显的优势，可显著提高 FRCM 的开裂应力高达 226% 和预开裂刚度。相反，尼龙和 PVA 等合成纤维在开裂后阶段则能提高开裂刚度、峰值应力和拉伸韧性。此外，研究还发现，使用长度较短的纤维可改善 FRCM 复合材料在开裂后阶段的拉伸性能，这是因为纤维在水泥基基体中的随机分布更好。最后，提出了一个人工神经网络 (ANN) 模型，用于预测含有微纤维的 FRCM 复合材料的拉伸参数。

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来源期刊

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464

期刊介绍： ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.