## 4 Results and Discussion  
### Experimental Results  
Individual pressure histories for each gauge location from one of the four repeat experiments at geometric scales of 75% and 100% are overlaid with cumulative specific impulse curves in Figure 5a,b, respectively. The noise in the dynamic pressure readings was insignificant during the initial positive duration. However, as the blast wave decayed and time progressed, the level of noise in the readings increased. This increase in noise is likely due to vibrations and movement within the bushings and steel pipes. A summary of the average value for the different blast wave parameters for the initial positive phase is shown in Table 3. The effects of the negative phase were neglected. Due to the variable nature of conducting blast tests, the range (in brackets) and standard deviation were also given. Pressure histories measured at gauge A exhibited an initial peak overpressure, followed by a secondary pressure peak. The secondary peak was lower in magnitude and more variable than the first peak at a similar arrival time as the span for the positive phase duration (shown in Table 3). The numerical simulations revealed that the secondary peak was caused by pressure reflections from the front wall. A Friedlander-type blast wave can be observed for gauges B1-B3 in Figure 5, whereby the peak overpressure magnitude decreases exponentially with respect to time. Peak incident overpressure decreased with increasing distance around the corner, as expected due to the greater stand-off distances. However, an enhanced reduction was observed due to shielding from the corner structure compared to a free-field explosion without the structure, consistent with the findings of [PERSON] et al. [24]. This is similar to shielding observed from barriers used to mitigate blast effects on other buildings due to an external detonation [36, 37] or clearing, which occurs on the reflected wall of a building and reduces the positive phase blast load [38]. Later blast wave arrival times and elongated positive phase durations were also evident with increasing distance around the corner. Table 3 shows good repeatability in the peak pressure magnitudes for the initial peak values for all gauges, except for gauge A, where larger variations and secondary peak pressure were found. Figure 6 shows all valid pressure histories of gauge A as well as gauge B2 for both laboratory-scale tests. The largest variation in incident pressure (and consequently impulse) occurred at gauge A, possibly because it was directly exposed to the detonation and therefore more susceptible to jetting. Small experimental errors in charge positioning (relative to the corner) will have influenced subsequent reflection behaviour, potentially affecting peak values measured at these locations. Despite a mould being used to create charge consistency, it is possible that slight differences would occur when setting up the experiment. The secondary peak at gauge A was more sensitive to the positioning, orientation, and shape of the charge. Furthermore, the reflection wave interacts with the surrounding environment and the initial propagating pressure wave. There were also slightly larger variations in pressure and arrival time for the 75% scale tests, attributed  
Figure 5: Overpressure–time histories and cumulative specific impulse at each gauge for the (**a**) 75% and (**b**) 100% scale tests. Gauge A: Compared to the B gauges, agreement between the 100% scale and predicted results for gauge A had higher discrepancies (4% to 8%) for the initial incident overpressure, arrival time, positive phase duration, and impulse. Despite these discrepancies, the predicted 100% and 75% values were within the experimental range for all four parameters. There was a considerable difference (12% to 27%) between the measured and predicted secondary peak overpressure values at the 100% scale. While the predicted secondary peak overpressure was within the measured range of the 100% test results, it occurred later than expected and persisted for a shorter time.