Slurry Wall Concrete Mix Design

R an steven r.

Slurry wall concrete mix design.

Department of the interior bureau of reclamation july 2014. 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. Because of the relative simplicity. 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.

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. 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. 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. 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.

Concrete mix design and workability shall be consistent for tremie or pump placement. This technique is typically used to build diaphragm water blocking walls surrounding tunnels and open cuts and to lay foundations. Concrete consolidation during placement. 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.

A slurry wall is a civil engineering technique used to build reinforced concrete walls in areas of soft earth close to open water or with a high groundwater table. Design guide slurry wall december 2008 page 1 of 43 i. This mixture is capable of filling all voids in irregular excavations and hard to reach places such as under undercuts of. The ratio for a basic concrete slurry mix is 1 or 2 parts portland cement to 1 part water.

Icos constructed the first structural slurry wall in the late 1950s for the milan metro puller 1996. The ideal texture of concrete slurry is thick and pasty with a consistency similar to tempera paint. The most important property of sb backfill is a low permeability. Typically sb backfill has a permeability in the range of 10 6 to 10 8 cm sec.

When combined with surecrete s color packs it allows design elements to match complement or contrast with the concrete piece. Either value is achievable with the right mix of.