Nath, A D; Hoque, M I; Datta, S D and Shahriar, F (2024) Various recycled steel fiber effect on mechanical properties of recycled aggregate concrete. International Journal of Building Pathology and Adaptation, 42(3), pp. 448-468. ISSN 23984708
Abstract
Purpose: The current study mainly focuses on the effect of varying diameter recycled steel fibers (RSF) on mechanical properties of concrete prepared with 25 and 50% of recycled coarse aggregate (RCA) as well as 100% natural aggregate (NA). Two types of RSF with 0.84 mm and 1.24 mm diameter having 30 mm length were incorporated into normal and recycled aggregate concrete (RAC). Design/methodology/approach: The fresh behavior, compressive, splitting tensile, flexural strengths and modulus of elasticity of all the mixes were investigated to evaluate the mechanical properties of RACs. In addition, specimen crack and testing co-relation were analyzed to evaluate fiber response in the RAC. Findings: According to the experimental results, it was observed that mechanical properties decreased with the increment replacement of NA by RCA. However, the RSF greatly improves the mechanical properties of both normal concrete and RACs. Moreover, mixes containing 1.24 mm diameter RSF had a more significant positive impact on mechanical properties than mixes containing 0.84 mm diameter RSF. The 0.84 mm and 1.24 mm RSF addition improved the mixes' compressive, splitting tensile and flexural strength by 10%–19%, 19%–30% and 3%–11%, respectively when compared to the null fiber mix. Therefore, based on the mechanical properties, the 1.24 mm diameter of RSF with 25% replacement of RCA was obtained as an optimum solution in terms of performance improvement, environmental benefit and economic cost. Practical implications: The practice of RCA in construction is a long-term strategy for reducing natural resource extraction and the negative ecological impact of waste concrete. Originality/value: This is the first study on the effects of varying size (0.84 mm and 1.24 mm diameter) RSF on the mechanical properties of RAC. Additionally, varying sizes of RSF and silica fume added a new dimension to the RAC.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | compressive strength; crack pattern; mechanical properties; recycled aggregate concrete; recycled steel fiber |
| Index terms: | performance improvement, dimension, testing, aggregate, natural resource, flexural strength, methodology, silica fume, replacement, recycled aggregate, modulus of elasticity, strategy, mechanical property, compressive strength |
| Subjects: | research methods, material analysis and testing, management, performance measurement, structural engineering, health safety and environment, material properties and characteristics, environmental resource management, health monitoring assessment and metrics, professional practice, materials science |
| Topics: | Quality Management, Health and Safety, Business Strategy, Construction Materials, Engineering Principles, Research Practice, Sustainability |
| Descriptive scope: | 3 PCT |
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