Grantees are working to expand use of environmental product declarations for construction materials.

Regional port authority says new standards for future projects are "industry-leading."

Cambridge Electric Cement uses cement paste from recycled concrete to replace the lime flux used in scrap steel recycling. Its slag can replace the clinker in portland cement. 

Startups and more established suppliers of products that reduce the carbon footprint of concrete are developing systems to make the product more sustainable.

Suppliers are beginning to offer concrete and cement products with reduced carbon content, but roadblocks remain in the way of widespread market penetration.