PSI - Issue 70

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

521

Fig. 2.SettingTimesofFMmixes.

5. Compression Strength Fig. 3 shows FM compressive strength on day 7 with 10%, 20%, 30%, 40%, and 50% SDA cement replaced at 1.46, 1.57,1.11, 0.6, and 0.41MPa respectively. On day 28, compressive strengths were 2.75, 2.95, 2.17, 1.78, and 1.42 MPa. Because FM combined with 20% SDA absorbs more calcium hydroxide (CaOH)2 during cement hydration, its compressive strength increases significantly. SDA's adaptability shows this pattern in early hydration. Cement hydrates quickly, producing more reaction products. SDA distribution restrictions may be improved by the additional stiffening gel. SDA increases FM particle packing density, reducing cement paste pore widths. the FM cementitious matrix did not alter composite strength.

Fig. 3. Compressive Strength of FM mix.

5. Flexural Strength Illustrates the testing of FM, FS utilising SDA in place of cement. SDA has substituted cement, enhancing FM flexural strength. The research indicated that a 20% replacement of cement with SDA was optimal for FM production. The flexural strength remained unchanged with replacement rates exceeding 20%. Nonetheless, the flexural strength diminished as a result of reduced cement concentration. Following a 28-day testing period, the FM samples exhibited flexural strengths of 0.61, 0.72, 0.80, 0.62, 0.48, and 0.38 MPa corresponding The sensitive surface of the SDA contributes to this behaviour in fig. 4.