210— Flowable Fill

200-40 Section 210 — Flowable Fill

210.1 Description 1 Furnish flowable fill as an alternat ive to compacted soil. Applications for this material include beddings, encasements, and closures for tanks and pipe and general backfill for trenches and abutments. 210.2 Materials 210.2.1 General 1 Flowable fill consist s of a mixture of Portland cement, fly ash, fine aggregate, air entraining admixture, and water. Flowable fill is inten ded to contain a low cementitious content for reduced strength development. 2 Use materials that meet the requirements of Division 700 with the following exceptions: •Fine Aggregate – Any clean fine aggregate from an SCDOT -qualified source, as shown on Qualified Products List 1, with 100% passing a ⅜ sieve and no more than 15% passing a No. 200 sieve may be used. All other fine aggregate gradation requirements are waived. •Air Entraining Admixtures – If desired, high air generators or foaming agents meeting the requirements of ASTM C869 when tested using ASTM C796 may be used. Use foaming agents appearing on Qualified Product s List 31 . Admixtures on Q ualified Product s List 5 may also be used in f lowable fill. 210.2.2 Mix Design 1 Submit mix designs to the SME for review a minimum of 12 days before use. Submit the mixes on the appropriate OMR form approved by the SME. After successful review by the SME, provide a copy of the mix design showing the SME’s stamp to the RCE before supplying that mix to the project. Once the mix has been reviewed by the SME, that mix is valid for a period of 3 years and can be supplied to any SCDOT project requiring that mix type, provided that the mix ingredients are not changed. 2 Flowable fill is available in either excavatable or non- excavatable proportions as specified by the RCE. The following table lists mix design proportion ranges for both types of flowable fill.