The Marin County (Calif.) Board of Supervisors unanimously adopted an ordinance that adds a low-carbon concrete specification to the county’s building code, effective January 2020. The new code applies to foundation, column or slab mix designs for private and public construction projects in unincorporated areas, and includes pathways for compliance with either reduced cement levels or lower-emission supplementary cementitious materials. Exemptions address higher cement contents typical of structural precast and lightweight aggregate concrete mixes.
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