Material Certification & Specifications
The City of Cincinnati and Hamilton County Engineer have jointly developed a specification for controlled low-strength material (CLSM) or controlled density fill (CDF), which are cementitious products used as non-settling (self-compacting) backfill. The following specification was updated in 2019 and producers are required to submit mix designs for approval of their products every five years.
Specifications
HAM-CIN CLSM-CDF Performance Specification - REV 2019
HAMCIN CLSM-CDF List of accepted Mixes 06.13.2025
Certification Forms