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Hawaii DOT Testing Sustainable Concrete

Tuesday, May 21, 2019

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In a move to facilitate the development of sustainable transportation technologies, the Hawaii Department of Transportation is testing a concrete mix injected with waste carbon dioxide.

Testing, which is occurring for the Kapolei Interchange Phase 2, includes a 150-cubic-yard pour. The pour is being compared with a standard concrete pour of the same amount, to determine specifications.

Sustainable Concrete Testing

Island Ready-Mix Concrete (Kapolei, Hawaii) was responsible for producing the carbon-injected concrete, and Hawaii Gas (Honolulu) provided the waste carbon dioxide, which is mixed into the concrete with CarbonCure technology.

Elemental Excelerator

In a move to facilitate the development of sustainable transportation technologies, the Hawaii Department of Transportation is testing a concrete mix injected with waste carbon dioxide.

As a result, carbon dioxide is trapped in mineral form within the building material, improving its strength. According to HDOT, the concrete currently undergoing testing could reduce embodied carbon by 25 pounds per cubic yard. For scale, a mile of concrete pavement uses around 21,000 cubic yards of concrete. In the department’s testing, 1,500 pounds of carbon dioxide will be saved, offsetting carbon emissions from 1,600 miles’ worth of highway driving.

The project received assistance from Elemental Excelerator, a local “startup accelerator” that has helped support more than 50 endeavors.

“I am pleased to see HDOT moving ahead with CarbonCure, local concrete companies and Hawaii Gas to reduce the levels of carbon dioxide emitted during the construction process,” said Gov. David Ige.

“As the daily baseline measurement for carbon dioxide in our atmosphere reaches the highest level in modern history, it is especially important for all of us to do all we can towards ensuring a sustainable Hawaii for future generations.”

According to HDOT, concrete is responsible for 7% of global manmade greenhouse emissions, ranking as the world’s second largest industrial source of carbon dioxide.

   

Tagged categories: Building materials; concrete; NA; North America; Program/Project Management; Research and development; Sustainability; Transportation

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