Flowable fill is a mixture of sand and concrete used to fill holes around in-ground pipes. It's not usually made during the colder months and can be difficult to purchase if the city runs out.

Applications for cellular concrete include lightweight engineered fill, MSE & retaining wall fill, lightweight insulating road subbase, flowable self compacting fill, pipe & culvert abandonments ...

GCP Applied Technologies’ Inc. new Concera admixtures enable the production of Control Flow Concrete, a new category of highly flowable segregation resistant concrete using conventional mix designs.