Flowable Fill

[jheidt2543]

I have run across a couple of projects that have "flowable fill" required as a backfill material. Basically the spec. calls out "low strength concrete of 1,000 psi at 28 days" or something similar. Are there any standard mix designs or specifications available?

 

[hornet2]

The ACI seminar I attended referred to flowable backfill as controlled low strength material.Typical CLSM mixture usually consists of 1.5% +/- of cement, 7-12% of flyash, 70-85% of sand and 7-17% of water, it has a flow spread of at least 8 in. You can type "controlled low strength material" into any web search engine and find a lot of DOT and university studies. The ACI literature is not free but you can get it if needed.

 

[hornet2]

You may want to find a copy of this publication as a guide. American Concrete Institute. Controlled Low Strength Materials (CLSM). Report No. 229R-94, ACI Committee 229, Detroit, Michigan, July, 1994.

 

[DRC1]

Most local Redi-mix suppliers now have flowable fill mixes. Check with the larger suppliers in your area

 

[jheidt2543]

Thanks to you all for the suggestions!