Slurry Wall Concrete Mix Design

Concrete mix design and workability shall be consistent for tremie or pump placement.

Slurry wall concrete mix design.

Flowable fill concrete is a self compacting cementitious slurry consisting of a mixture of fine aggregate or filler water and cementitious material which is used as a fill or backfill in lieu of compacted soil backfill. Cement bentonite slurry wall mix design christopher r. This technique is typically used to build diaphragm water blocking walls surrounding tunnels and open cuts and to lay foundations. Typically sb backfill has a permeability in the range of 10 6 to 10 8 cm sec.

This mixture is capable of filling all voids in irregular excavations and hard to reach places such as under undercuts of. The ideal texture of concrete slurry is thick and pasty with a consistency similar to tempera paint. Environmental projects often require a permeability less than 1 x 10 7 cm sec but a levee or dewatering project may require a permeability less than 1 x 10 6 cm sec. If the slurry is too runny or too thick it will not adequately adhere to the concrete surface and will prevent bonding between the concrete layers.

In particular the concrete slump should be 8 inches 1 inch for tremie or slurry construction and 7 inches 1 inch for all other conditions. The most important property of sb backfill is a low permeability. Concrete consolidation during placement. Surecrete s xs casting concrete slurry mix was designed to quickly fill voids and pinholes in precast concrete pieces or any concrete where a smooth surface is desired.

R an steven r. Icos constructed the first structural slurry wall in the late 1950s for the milan metro puller 1996. When combined with surecrete s color packs it allows design elements to match complement or contrast with the concrete piece. Introduction this guide was developed to assist designers in evaluating the suitability of concrete diaphragm walls slurry walls for earth support for project application to provide an understanding of common construction issues and provide guidance on construction inspection requirements.

Either value is achievable with the right mix of. Design guide slurry wall december 2008 page 1 of 43 i. The ratio for a basic concrete slurry mix is 1 or 2 parts portland cement to 1 part water. Day äbsträct ä cement bentonite cb slurry cut off wall is a variation of the slurry wall process that is used to create an underground barrier to stop the lateral flow of ground water and other fluids.

Department of the interior bureau of reclamation july 2014. The first diaphragm walls were tested in 1948 and the first full scale slurry wall was built by icos in italy in 1950 puller 1996 with bentonite slurry support as a cut off wall.