Title:
Boston Central Artery/Third Harbor Tunnel Project Utilizes CLSM
Author(s):
Richard W. Sullivan
Publication:
Concrete International
Volume:
19
Issue:
5
Appears on pages(s):
40-43
Keywords:
backfilling; flowability; fly ash; low-strength materials; tunnels
DOI:
Date:
5/1/1997
Abstract:
The escalating costs of Boston's Central Artery/Third Harbor Tunnel project led to serious investigation and utilization of a revolutionary backfill material supplied by ready-mixed concrete trucks. Flowable fill, or controlled low-strength material (CLSM), was the answer to the concerns of: proper backfill installation, expediting backfill and concreting operations, economical slurry walls, safety and many other issues on this multi-billion dollar project, designed to alleviate Boston's traffic snarls. This "designer dirt" flows like a liquid, yet supports like a solid. The CA/T project is using flowable fill as a solution to its engineering needs.