List of Pre-Qualified Supplier's Concrete Mix Designs
List of Pre-Qualified Concrete Mix Designs
The following is a list of pre-qualified concrete mix designs that comply with the County's Low Carbon Concrete Ordinance as registered by ready-mix businesses supplying concrete within the County. This list does not endorse any one business. All businesses supplying concrete within Unincorporated Marin County are welcome to pre-qualify their mix design(s) by completing this application form.
Pre-Qualified Concrete Mix Designs
(The table below is informational only. For more details on mix designs please contact the listed business.)
| County Issued Ref. No. |
Supplier |
Mix design (No./Code) |
Application |
Strength @ 28 days (psi) |
W/C Ratio |
Binder |
Contact |
| 00001 |
Shamrock Materials |
4362A-SL |
Sidewalks, Curbs, and Gutters; Walls; Slabs; Curb & Gutter; ADA Ramps |
4000 |
0.50 |
451 lbs. Cmt, 20% Slag |
Greg Gehring |
| 00002 |
Shamrock Materials |
SL-9324LC |
Sidewalks, Curbs, and Gutters; Walls; Beams; Slabs; Precast; Prestressed; Curb & Gutter; ADA Ramps |
4000 |
0.50 |
394 lbs. Cmt, 30% Slag |
Greg Gehring |
| 00003 |
Shamrock Materials |
6375HV |
Walls; Beams; Slabs; Precast; Prestressed |
5000 |
0.40 |
494 lbs. Cmt, 30% Slag |
Greg Gehring |
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*Last Updated 2/06/2023