PSI - Issue 70

Rakesh Kumar et al. / Procedia Structural Integrity 70 (2025) 517–524

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Fig. 4. Flexural Strength of FM mixes.

6. Split Tensile Strength Tensile Strength measured at 7, 14 and 28 day. SDA substituted 20% , boosting split tensile strength 37.42%, 33.75%, and 35.37%. increase due to early hydration reactivity. FM cementitious material's matrix creates a lot of C S-H gel, which may explain this. SDA adds nucleation sites to make hydrated products early. SDA may replace 10% to 30% cement to boost split tensile strength, according to this study. Ideal FM cement replacement was 20% of cement consumption in fig. 5.

Fig. 5.TensilestrengthofFMmixes.

7. Characteristics of the Body Fig. 6 illustrates that an increase in SDA consistently leads to a reduction in holes larger than 200 µm in the specimens. continued until reaching the goal of 20% SDA. It demonstrates enhanced packing density of FM materials and a refined pore structure. The inclusion of SDA decreased the composition porosity. Our data indicated that a 20% SDA FM combination yielded the highest number of pore diameters less than 100 µm. The formation of C – S – H gel obstructs capillaries to a greater extent. The increase in SDA content beyond 30% resulted in pores exceeding 200 µm in size. The FM matrix failed as a result of cement dispersion. Degradation has likely led to the expansion of unevenly distributed holes.