California highway ramp built on 662,700 waste tires has held firm for 22 years
Engineers upgrading a highway interchange in Milpitas, California, encountered unstable bay mud that posed serious ground settlement risks. To address this, they chose shredded waste tires as a lightweight fill material beneath the I-880 ramp. The unconventional solution reduced the load on soft soil by 40 percent while also cutting overall project costs significantly. More than 662,700 waste tires were repurposed in the construction. Over the following 22 years, the structure has required no maintenance and shown no signs of structural damage.
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