PSI - Issue 70

Yankesh et al. / Procedia Structural Integrity 70 (2025) 311–318

316

7-Days (Normal Curing)

7-Days (Normal Curing) 28-Days (Normal Curing)

50

0 10 20 30 40 50 Compressive Strength (MPa)

40

30

20

10

Compressive Strength (MPa)

0

MixDesign

Mix Design

Fig. 4. Compressive strength of GPC Over time.

Fig. 5. Effect of curing method on GPC.

3.3 Development of split tensile strength at 28 days at normal curing at different dosage of activator The splitting tensile strength of the concrete mix design was found by testing the mix design cylindrical specimen in the compression testing machine. From the test result shown in fig.6. it was observed that Split tensile strength rises with an activator content up to 14% beyond which it slightly declined. Mix M7 with 12% activator recorded 2.66 MPa strengths, rising up to peak of 4.8 MPa in M8 with 14% activator. Mix M9 and M10 with 16% and 18% showed reduction in strengths of 4.0 MPa and 3.5 MPa, respectively. By analyzing all results this indicates that 14% to 16% activator offers good range for tensile performance, while lower and higher contents may negatively affect the matrix due to excessive alkalinity and other factors. 3.4 Effect of activator percentage on flexure strength at normal curing The flexural strength of the concrete mix design is identified by testing the beam sample of the mix design in the flexural testing machine under a Two-Point load applied on the section of the beam in the transverse direction. Several mixes at different activator contents (12% – 18%) showed a clear influence on 28-day flexural strength. From the test results shown in fig.7. it was observed that with increase in percentage of activator the flexural strength is increased which further decrease down as we increase the doses of activator.

GPC Conventional

0 1 2 3 4 5 6

GPC Conventional

0 1 2 3 4 5

28- Day Split Tensile Strength (MPa)

M7-12% M8-14% M9-16% M10-18%

M7-12% M8-14% M9-16% M10-18%

Flexural Strength (MPa)

Mix Design

Mix Design

Fig. 6. Split Tensile Strength Development.

Fig. 7. Flexural Strength Development at 28 Days