PSI - Issue 70

Saurav Kar et al. / Procedia Structural Integrity 70 (2025) 674–681

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moderate, can be accepted. The standard deviation (S.D.) vales ranged from 1.5 to 2.5. Since 28-days compressive strength is regarded as standard, the regression equation obtained for w/b ratio of 0.38 is mentioned below.

Fig. 2. Compressive Strength at 28-days vs fly ash content % of total conventional cement for series 1,2 and 3

Fig. 3. Compressive Strength at 28-days vs fly ash content % of total conventional cement for series 4, 5 and 6 σ comp = − 0.235xF ℎ (%)+36.82 Similarly, regression equation obtained for w/b ratio of 0.36 is mentioned below σ comp = − 0.245xF ℎ (%)+38.67 (8) For w/b ratio of 0.32, the regression equation is mentioned below. 0.67 MPa is determined as S xy and 1.8 as S.D. σ comp = − 0.26xF ℎ (%)+40.6 (9) A sample linear regression analysis is shown in fig.4. ANOVA (Analysis of variance) is implemented. (7)