The Port Authority of New York and New Jersey says it reached an important milestone in a nearly three-year-old sustainable construction and design initiative. The agency announced earlier this month what it calls “industry leading” low-carbon concrete requirements for contractors building its future projects. While setting maximum allowable carbon limits, the policy also allows conditional inclusion of ground glass and Portland-limestone cement—which is engineered with a higher limestone content that needs less energy to produce than typical cement mixes.
