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... water into the concrete mixture due to its glassy texture. The free water is being utilized by the basalt fibers to ensure homogenous dispersion of fibers in the mixture [19]. Even though, the basalt fibers reduces the fluidity in concrete, the shape and texture of copper slag which is spherical and glassy, aids the mixture in smooth dispersion. Fig. 4 illustrates the cube compressive strengths to the curing period of 7 and 28 days along with the strength effectiveness with respect to non-fiber mixtures with (C40B0) and without copper slag (C0B0). The compressive test set up has been shown in Fig. 4. From the evaluated strength, it is distinct that the addition of fibers does not ...
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... and texture of copper slag which is spherical and glassy, aids the mixture in smooth dispersion. Fig. 4 illustrates the cube compressive strengths to the curing period of 7 and 28 days along with the strength effectiveness with respect to non-fiber mixtures with (C40B0) and without copper slag (C0B0). The compressive test set up has been shown in Fig. 4. From the evaluated strength, it is distinct that the addition of fibers does not illustrate too drastic reduction in compressive strength, it is just that appropriate consolidation is more challenging with greater fiber quantity. According to the Fig. 5, the compressive strength of the mixture with 40% copper slag and 0.3, 0.6% basalt ...
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Citations
... BFs have high tensile strength, excellent adhesion to the matrix, and good chemical and thermal stability [96]. These properties make them a suitable reinforcement material for concrete, particularly in arresting and bridging cracks which stops the dispersal of cracking and ultimately improves the flexural strength [97]. Adding BFs to the concrete matrix resulted in a more efficient load distribution, leading to a higher resistance to bending and cracking [98]. ...
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... This drop can be attributed to excess fiber volume compared to the material volume, causing some of the fibers to entangle and form clumps or sediments within the material. As a result, these unevenly distributed fibers cannot adequately bond to the material, thereby affecting its overall strength [38]. In Figure 8b, when the fiber content is in the range of 0-0.3%, the CLSM strength is proportional to the fiber content; and when the fiber content is 0.45%, the CLSM strength decreases. ...
Numerous studies have been conducted on fiber-reinforced concrete; however, comparative investigations specifically focusing on the utilization of fibers in CLSM remain limited. In this study, we conducted a systematic investigation into the mechanical properties of controlled low-strength material (CLSM) by manipulating the length and doping amount of fibers as control variables. The 7-day compressive strength (7d-UCS), 28-day compressive strength (28d-UCS), and 28-day splitting strength of CLSM were employed as indicators to evaluate the material’s performance. Based on our comprehensive analysis, the following conclusions were drawn: (1) A positive correlation was observed between fiber length and material strength within the range of 0–6 mm, while conversely, a negative correlation was evident. Similarly, when the fiber doping was within the range of 0–0.3%, a positive correlation was identified between material strength and fiber doping. However, the strength of CLSM decreased when fiber doping exceeded 0.3%. (2) SEM and PCAS analyses provided further confirmation that the incorporation of fibers effectively reduced the porosity of the material by filling internal pores and interacting with hydration products, thereby forming a mesh structure. Overall, this study offers valuable insights into the manipulation of fiber length and doping amount to optimize the mechanical properties of CLSM. The findings have important implications for the practical application of CLSM, particularly in terms of enhancing its strength through fiber incorporation.
