Recycled Glass Concrete Tested in Long Island Sound

New York researchers are testing glass-fortified concrete blocks to create more sustainable marine infrastructure by 2028.

Updated on Oct. 22, 2026 in Environmental

Recycled Glass Concrete Tested in Long Island Sound

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Should states invest more in infrastructure built from recycled waste materials?

Researchers have submerged concrete test blocks made with recycled glass particles into the Long Island Sound to evaluate their durability in saltwater. Developed at Alfred University, the project aims to establish a more sustainable, carbon-efficient alternative to traditional cement in marine infrastructure.

Why it matters

The project seeks to reduce the significant carbon emissions associated with conventional cement production by repurposing waste glass. By testing whether glass-based pozzolans enhance longevity in marine environments, researchers hope to scale the material for future use in seawalls and breakwaters.

The test blocks measure 4 cubic feet each and incorporate recycled glass particles in place of traditional crushed stone. Researchers will monitor these samples over the next 2 years to assess performance relative to standard marine-grade concrete.

The players

Alfred University

A research institution based in Allegany County, New York, that develops sustainable material science innovations.

New York State Department of Environmental Conservation

The state agency responsible for managing natural resources and funding environmental sustainability projects.

Silica-X

A partner organization specializing in the manufacture and deployment of experimental concrete products.

The details

Alfred University developed the concrete mix, which utilizes glass-based pozzolans—siliceous materials that react with calcium hydroxide to form binding compounds in cement. Silica-X manufactured the blocks, which were then transported from the university campus in Allegany County to the coast. This study investigates if this glass-fortified structure can withstand the corrosive effects of saltwater better than standard cement mixtures.

The concrete blocks were placed into Long Island Sound in early October 2026.
Researchers will study the submerged blocks over a two-year period from 2026 to 2028.

The Tech Race

This project benchmarks its durability testing against long-standing marine research, such as the Navy's studies on concrete spheres at depths of up to 5,075 feet. It marks a shift from testing deep-sea structural limits to optimizing coastal infrastructure for lower carbon footprints.

The immediate impact is limited to long-term academic data collection within the Long Island Sound. If the testing confirms that glass-fortified concrete is viable for seawalls and breakwaters, the state may begin scaling the material for public coastal infrastructure projects starting in 2028.

The takeaway

The study offers a pathway to reducing the environmental footprint of essential marine defenses using recycled waste materials. Interested readers should watch for the initial performance reports expected following the two-year observation period ending in 2028.