Date: 2020


The H-1 Freeway in Oahu is the first roadway in Hawaii to receive an epoxy overlay treatment. Washington Rock shipped several hundred tons of Armorstone overlay aggregates to Oahu to top the epoxy overlay.

The H-1 Freeway is the oldest and longest interstate highway in the Hawaiian Islands. In the last few years, the Hawaii Department of Transportation (HDOT) has been replacing sections of pavement. The epoxy surface treatments help extend the life of these repairs. The first portion of the epoxy treatment project focused on the Waimalu Viaduct, specifically a 1,300-foot section between the Kaahumanu Street and Kaonohi Street overpasses.


2,200 tons of various Armorstone products, including Armorstone Crack Seal Sand


Armorstone overlay aggregate passed the strict requirements of the Hawaii Department of Transportation (HDOT), which required that the rock be durable, polish resistant, and abrasion resistant. Engineers also liked that Armorstone rock was available in a variety of sizes and had an appealing rustic brown color.

The Washington Rock team ensured that each Super Sack of crack seal sand was stabilized for a 2-week trip on the Pacific Ocean from the Port of Tacoma to Oahu—a 2,600-mile trip.

Read more about the project in our article, "Aloha, Armorstone! How Our Little Rocks Made a Big Difference in Oahu."

Aerial photo courtesy of the Hawaii Department of Transportation.