The National Ready Mix Concrete Association (NRMCA) has a great series of resources promoting the concept of performance-based concrete specs (specs that would not limit SCM content, among other restrictions). This series incorporates technical resources, including resources to understand the impact of SCMs on durability. My personal takeaway from the material: set strong performance requirements and don’t place limits on SCMs. Encourage low carbon, and consult with your local concrete providers to see what options they may be able to provide to meet low carbon and performance criteria.
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