Auger feeder for concrete mix, and slipform-casting apparatus

An auger feeder for concrete mix, comprising:

• a portion comprising a helical segment, and having an upstream end and a downstream end;
• an insert, comprising:
• a first end mounted on the upstream end of the portion comprising the helical segment,
• a second end, comprising a face disposed in the upstream direction of the auger feeder, and comprising means for fastening the auger feeder to a casting apparatus, and
• a material softer than that of the helical segment, and
• an cast infill disposed at, and extending in the upstream direction from, the upstream end of the helical segment and covering at least part of the insert at the first end thereof.