Improving the performance of recycled aggregate concrete using nylon waste fibers

被引：0

作者：

Ali, Babar ^{[1
]}

Fahad, Muhammad ^{[2
]}

Mohammed, Ahmed Salih ^{[3
]}

Ahmed, Hawreen ^{[4
,5
,6
]}

Elhag, Ahmed Babeker ^{[7
]}

Azab, Marc ^{[8
]}

机构：

[1] Lecturer, Department of Civil Engineering, COMSATS University Islamabad, Sahiwal Campus, Sahiwal,57000, Pakistan

[2] Department of Civil Engineering, University of Engineering & Technology (UET), Peshawar,25000, Pakistan

[3] Civil Engineering Department, College of Engineering, University of Sulaimani, Kurdistan, Iraq

[4] Department of Highway and Bridge Engineering, Technical Engineering College, Erbil Polytechnic University, Erbil,44001, Iraq

[5] Department of Civil Engineering, College of Engineering, Nawroz University, Duhok,42001, Iraq

[6] CERIS, Civil Engineering, Architecture and Georresources Department, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, Lisbon,1049-001, Portugal

[7] Department of Civil Engineering, College of Engineering, King Khalid University, Abha,61413, Saudi Arabia

[8] College of Engineering and Technology, American University of the Middle East, Egaila,54200, Kuwait

来源：

Case Studies in Construction Materials | 2022年 / 17卷

关键词：

Concrete and recycling - Fiber and environment - High-performance concrete - Mechanical performance - Nylon fibre - Permeability - Recycled aggregate concrete - Recycled aggregates - Recycled nylons;

D O I：

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学科分类号：

摘要：

The use of coarse recycled aggregates (CRA) as the replacement for natural aggregates is an eco-friendly solution to alleviate the extraction of natural resources and the harmful effects of demolition wastes on the environment. However, the mechanical and durability characteristics of CRA concrete are generally inferior compared to ordinary concrete. The performance of CRA concrete can be supplemented using different fibers and secondary binder materials. This study encourages the idea of using recycled nylon fiber (RNF) to upgrade the ductility of high-performance concrete (HPC) made with CRA. For this purpose, the effect of RNF on HPC properties was explored. RNF was introduced in HPC at four different volume fractions i.e., 0.1 %, 0.25 %, 0.5 % and 1 %. The experiments showed that RNF is generally harmful to the compressive strength and density of HPC. However, at 0.1 % volume, RNF showed a nominally positive effect on compressive strength. RNF addition was highly useful in enhancing the splitting tensile strength and crack resistance of HPC. The tensile strength loss of HPC due to 50 % and 100 % CRA incorporation can also be balanced using 0.25–0.5 % RNF. Water absorption and chloride permeability of HPC were marginally reduced at the incorporation of 0.1–0.25 % RNF. The recommended dosage of RNF is 0.25 %, considering the maximum tensile strength and low permeability of HPC. Owing to the addition of 0.5 % RNF, a CRA-based HPC can attain tensile strength higher than ordinary HPC. Thus, for tensile-loading applications, CRA-RNF-based HPC provides a ductile, and eco-friendly alternative to an ordinary plain HPC. © 2022 The Authors

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