Over time, however, people discovered substantive benefits to the use of those materials from a performance perspective, including higher strength, improved workability, and low heat of hydration.Īs the industry moves toward a transparent understanding of the lifecycle impacts of materials and health considerations, concerns over fly ash have incentivized us to look at alternative SCMs. SCMs were originally added to concrete mixes to offset the quantity of Portland cement. The industry has been working to optimize concrete mixes for a number of years because of the vast amount of Portland cement required in building, and the dramatic, adverse environmental implications of its use. Testing is showing that ground glass pozzolan is a high-performance, low-environmental impact option to replace Portland cement in concrete mixes that currently use fly ash, slag, and silica fume as SCM. The NYC metro area generates far more post-consumer glass for recycling than we have consistent end uses for. Other supplemental cementitious materials (SCM), such as slag and flay ash, are substandard options as cement replacements due to harmful environmental consequences, and diminishing availability. The discussion revolved around post-consumer recycled glass as a cement replacement in high-performance concrete. Moderated by Amanda Kaminsky from The Durst Organization, the panelists included Tom Outerbridge (Sims Municipal Recycling), Lou Grasso (Kingston Block & Masonry Supply and Urban Mining Northeast), Bill Stanley (O&G Industries), Julio Davalos (City College of New York – CUNY), Rich Garlock (LERA Consulting Structural Engineers), Cawsie Jijina (Severud Associates Consulting Engineers), and Mike Welc (Euclid Chemical). A group of industry practitioners and experts came together at the Structural Engineers Association of New York (SEAoNY) to discuss the building product ecosystem, and explore options for concrete mixes optimized for performance, schedule considerations, and reduced environmental impact.
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