The biochar was able to suck up to 23 percent of its weight in carbon dioxide from the air.
that is nearly as strong as regular concrete by infusing regular cement with biochar, a type of charcoal made from organic waste.
“We’re very excited that this will contribute to the mission of zero-carbon built environment,” said Xianming Shi, professor in the WSU Department of Civil and Environmental Engineering and the corresponding author on the paper. In the past, attempts have been made to add biochar as a substitute in cement to make it more environmentally friendly but adding even 3 percent of the material dramatically reduced the strength of the concrete.This is where WSU researchers came up with a better solution: after treating biochar in the concrete washout wastewater, they could add up to 30 percent biochar to their cement mixture.
“The trick is really in the interfacial engineering – how you engineer the interfaces in the concrete.”
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