The Effect of Welded Splice with Predetermined Gap of Concrete Spun Pile on The Response of Low Strain Integrity Test

This paper presents the velocity wave of concrete spun piles with welded splice. The
stress wave velocity was recorded using Pile Integrity Test. Two specimens were prepared in the
experiment. The first sample was prepared visually no gap between the two end-plates of
connected piles, while the second specimen was prepared by inserting 5mm thick steel plate into
the splice to create a gap in its connection. The results show that a spike of reflecting stress wave
still develops at the splice with and without gap, regardless the splice was welded in full circle. The
relatively high spikes of reflecting waves at pile toe are noticed for both specimens with and
without gaps. It shows that the full welded splice able to transfer stress wave velocity. A good
quality of welded splice can be indicated by the reflecting wave at the pile toe, regardless the
reflecting wave development at the splice.