**3.2 Split tensile strength**

The split tensile strength after 28 days for mixes G10A, G20A, G30A, G40A, G50A and G0A are 3.54, 3.96, 4.24, 4.81, 4.05 and 2.86 MPa respectively and these values are represented in **Figure 9**. The test results indicate that the maximum split tensile strength of 4.81 MPa is achieved for G40A mix. This may be due to the fact that addition of GGBS upto 40% increases the consistency, mortar phase and bond strength between mortar and aggregate. However, the split tensile strength of concrete decreased after 40% addition of GGBS which may be due to the glossy surface, surface texture and relatively low density reducing the bond strength and consistency (**Figure 10**).
