see also my Discussion entry

'dagstort' has a max. length of 8m according to the sentence above and the following reference suggests that it is part of the construction surface.

Ter plaatse van een dagstort: aanbrengen van een dubbel net 150/150/8/8 (of zwaarder volgens berekening), aan beide zijden 50 cm ingestort (of minimum de verankeringslengte) + klassieke
waterdichtheidsmaatregelen.

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&c...


daywork joint/ construction joint

It is often not possible to complete a job at one go, for example because of the size or complexity of the structure or because of limited materials or manpower. When work resumes it will be necessary to place fresh concrete on or against the previous pour, that will have already hardened. The resultant contact surface is known as a construction joint or daywork joint. Such joints must be formed carefully so that they transmit the required forces and, where appropriate, do not leak.
http://www.concrete.org.uk/fingertips-nuggets.asp?cmd=displa...


Construction Joints: These are vertical or horizontal joints that are used between two successive pours of concrete. Keys are used to increase the shear resistance at the joint. If keys are not used, the surface of the first pour is cleaned and roughened before the next placement of concrete. Keys are almost always formed in the base to give the stem added sliding resistance. The base is formed first, and the stem constructed afterwards.
https://www.concretenetwork.com/concrete/poured_concrete_ret...