PSI - Issue 70

Hariharan kannan et al. / Procedia Structural Integrity 70 (2025) 658–665

661

Table 4 waste foundry sand ’s physical characteristics Constituent

Attributes

Specific Gravity Density Maximum size(mm) Fineness modulus Materials finer than 75 mm (%) Table 5 Physical Properties of Fly ash Constituent

2.63 2.45 4.76 2.8 8

Attributes

Specific Gravity Fineness modulus

2.45 2.35

Table 6 Chemical configuration of Fly ash Constituent

Attributes

SiO 2 Al 2 O 3 Fe 2 O 3 CaO MgO SO 3 K2O

65.6 25.21

3.23 0.56 1.85 0.5 0.85

Table 7 Mix Proportions Details Mix ID Fly ash (Kg/m 3 )

M-sand (Kg/m 3 )

Foundry sand (Kg/m 3 )

CA (Kg/m 3 )

NaOH (Kg/m 3 )

Na2SiO3 (Kg/m 3 )

Super plasticiser (Kg/m 3 )

Molarity

GPP_P0 GPP_P15 GPP_P30 GPP_P45 GPP_P60 GPP_P75 GPP_P100

530 530 530 530 530 530 530

622

0

1088 1088 1088 1088 1088 1088 1088

53 53 53 53 53 53 53

132.5 132.5 132.5 132.5 132.5 132.5 132.5

3.71 3.71 3.71 3.71 3.71 3.71 3.71

14 14 14 14 14 14 14

528.7 435.4 342.1 248.8 155.5

93.3

186.6 279.9 373.2 466.5

0

622

4. Formulation, mixing and curing of specimen The samples were prepared using saturated, surface-dried aggregates. Two hours prior to the addition of the other materials, the NaOH solution was set twenty-four hours preceding to the casting and thoroughly combined with the NaOH solution Fig. 1. In mixing process first made a dry mix by combining the fly ash along with fine aggregate and coarse aggregate for three minutes. Then augment the alkaline activator solution and superplasticizer slowly and mixed with required amount of water. To ensure homogeneity, mixing was carried out for up to 5 minutes. Then the prepared concrete was poured into paver block mould of size 270mm x 125mm x 80mm for compressive strength testing, flexure strength testing, abrasion testing and water absorption testing. The casted blocks were kept at rest in room condition