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Hawaii DOT To Use Sustainable Concrete

Monday, July 15, 2019

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The Hawaii Department of Transportation has announced the state’s approval for the use of carbon-injected concrete in all its flat work-based construction projects, such as roads and sidewalks, as well as being part of its climate change solution.

The material is still being tested for use in vertical projects such as rockfall protection walls and bridges.

Testing Carbon Concrete

Back in May, HDOT announced that it would be testing concrete mixes injected with waste carbon dioxide. The testing took place at the Kapolei Interchange Phase 2 project, which included a 150-cubic-yard pour. The pour was then compared with a standard concrete pour of the same amount, to determine specifications.

Omegaforest / Getty Images

The Hawaii Department of Transportation has announced the state’s approval for the use of carbon-injected concrete in all its flat work-based construction projects, such as roads and sidewalks, as well as being part of its climate change solution.

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

“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, the concrete that underwent testing reduced 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 was saved, offsetting carbon emissions from 1,600 miles’ worth of highway driving.

What’s Happening Now

Edwin Sniffen, deputy director of highways for HODT, said that testing indicates that not only is the carbon-injected material stronger than traditional concrete, it is also more workable with no increase in cost.

On the word of Robert Kroning, head of the city’s Department of Design and Construction, for now, bids issued by Honolulu won’t require the new building material and won’t restrict its use either. Having passed a resolution in April, the Honolulu city council aims to consider CO2-injected concrete wherever applicable, including apartment buildings.

“If it’s much better then maybe we will start making it [a] requirement,” he added.

Until then, Hawaii is continuing to work with Canadian startup CarbonCure Technologies, where they have begun testing the materials use in more intense projects.

Additionally, CarbonCure chief executive Robert Niven has stated that his company is also in talks with other U.S. DOTs regarding the future use of the material, as well as 10 countries in Asia, Europe and Canada.

   

Tagged categories: Carbon dioxide; Carbon footprint; CarbonCure Technologies Inc.; concrete; Construction; Department of Transportation (DOT); NA; North America; Program/Project Management; Research and development; Roads/Highways

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