Adobe Stock / aleoks

AeroAggegates has opened a former locomotive factory in Eddystone, Pa., to produce lightweight construction material from recycled mixed glass. Researchers at Drexel University and Lafayette College say the material can be used as aggregate in concrete.

The material AeroAggregates manufactures is foamed glass aggregate, which resembles crushed rock and serves a similar purpose in construction projects. It might seem crazy to manufacture stone, since there is no shortage of naturally occurring rock. But foamed glass aggregate is not ordinary rock — it weighs 85 percent less than stone, and yet is still very strong.

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