Concrete 2017 - second pour

With the additional triangle of concrete covering the cracked joint. Some of the earthware pipe is still exposed, just below the soil bottom right. Odd, for a generally well-built house from the 1930's, that this pipe should be so close to the surface.

I am considering benching up the corner between the new concrete and the old housing, in the way of that down the bottom of manholes, with some mortar. Which as well as improving the shape would cover up minor flaws in the work so far. But would such benching bond?