Construction Experience With CLSM Fly Ash Slurry for Underground Facilities


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Title: Construction Experience With CLSM Fly Ash Slurry for Underground Facilities

Author(s): B. W. RammeE, T. R. Naik, and H. J. Kolbeck

Publication: Special Publication

Volume: 153


Appears on pages(s): 403-416

Keywords: backfilling; compacting; compressive strength; fly ash; electrical resistance; slurries; subsurface structures; thermal conductivity; Materials Research

Date: 6/1/1995

Presents the results of research performed in developing and using flowable fly ash slurry which is classified as a Controlled Low Strength Material (CLSM) as defined by ACI Committee 229 for underground facility construction and abandonment. The mixture proportions for the CLSM described in this paper used fly ash as a primary ingredient. The fly ash was produced at Wisconsin Electric's Port Washington Power Plant as a byproduct of burning coal from Pennsylvania. Port Washington Power Plant has four 80 MW electric generating units that were brought in service between 1935 and 1949. Additional ingredients included portland cement, water, and conventional fine and coarse aggregates. Information is also included on the compressive strength, electrical resistivity, thermal conductivity, and compatibility with plastics used in the manufacture of underground electric cable jackets and natural gas lines. The results indicate that CLSM fly ash slurry is an excellent material for backfilling trenches and filling abandoned underground facilities.


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