Proposed Zero-Carbon Cement Solution Called ‘Absolute Miracle’

“Concrete and steel production are major sources of CO2 emissions,” writes New Atlas, “but a new solution from Cambridge could recycle both at the same time.”

Throwing old concrete into steel-processing furnaces not only purifies iron but produces “reactivated cement” as a byproduct. If done using renewable energy, the process could make for completely carbon-zero cement.

Concrete is the world’s most used building material, and making it is a particularly dirty business — concrete production alone is responsible for about 8% of total global CO2 emissions. Unfortunately it’s not easy to recycle back into a form that can be used to make new concrete structures… For the new study, Cambridge researchers investigated how waste concrete could be converted back into clinker, the dry component of cement, ready to be used again. “I had a vague idea from previous work that if it were possible to crush old concrete, taking out the sand and stones, heating the cement would remove the water, and then it would form clinker again,” said Dr. Cyrille Dunant, first author of the study…

An electric arc furnace needs a “flux” material, usually lime, to purify the steel. This molten rocky substance captures the impurities, then bubbles to the surface and forms a protective layer that prevents the new pure steel from becoming exposed to air. At the end of the process, the used flux is discarded as a waste material. So for the Cambridge method, the lime flux was swapped out for the recycled cement paste. And sure enough, not only was it able to purify the steel just fine, but if the leftover slag is cooled quickly in air, it becomes new Portland cement.

The resulting concrete has similar performance to the original stuff. Importantly, the team says this technique doesn’t add major costs to either concrete or steel production, and significantly reduces CO2 emissions compared to the usual methods of making both. If the electric arc furnace was powered by renewable sources, it could essentially make for zero-emission cement.

“The first industrial-scale trials are underway this month,” the article adds.
“Producing zero emissions cement is an absolute miracle, but we’ve also got to reduce the amount of cement and concrete we use,” said Professor Julian Allwood, who led the research.

And the professor has also recorded a thoughtful video visualizing the process — and explaining the significance of their breakthrough.

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FTC Chair: AI Models Could Violate Antitrust Laws

An anonymous reader quotes a report from The Hill: Federal Trade Commission (FTC) Chair Lina Khan said Wednesday that companies that train their artificial intelligence (A) models on data from news websites, artists’ creations or people’s personal information could be in violation of antitrust laws. At The Wall Street Journal’s “Future of Everything Festival,” Khan said the FTC is examining ways in which major companies’ data scraping could hinder competition or potentially violate people’s privacy rights. “The FTC Act prohibits unfair methods of competition and unfair or deceptive acts or practices,” Khan said at the event. “So, you can imagine, if somebody’s content or information is being scraped that they have produced, and then is being used in ways to compete with them and to dislodge them from the market and divert businesses, in some cases, that could be an unfair method of competition.”

Khan said concern also lies in companies using people’s data without their knowledge or consent, which can also raise legal concerns. “We’ve also seen a lot of concern about deception, about unfairness, if firms are making one set of representations when you’re signing up to use them, but then are secretly or quietly using the data you’re feeding them — be it your personal data, be it, if you’re a business, your proprietary data, your competitively significant data — if they’re then using that to feed their models, to compete with you, to abuse your privacy, that can also raise legal concerns,” she said.

Khan also recognized people’s concerns about companies retroactively changing their terms of service to let them use customers’ content, including personal photos or family videos, to feed into their AI models. “I think that’s where people feel a sense of violation, that that’s not really what they signed up for and oftentimes, they feel that they don’t have recourse,” Khan said. “Some of these services are essential for navigating day to day life,” she continued, “and so, if the choice — ‘choice’ — you’re being presented with is: sign off on not just being endlessly surveilled, but all of that data being fed into these models, or forego using these services entirely, I think that’s a really tough spot to put people in.” Khan said she thinks many government agencies have an important role to play as AI continues to develop, saying, “I think in Washington, there’s increasingly a recognition that we can’t, as a government, just be totally hands off and stand out of the way.” You can watch the interview with Khan here.

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Google Threatens To Pause Google News Initiative Funding In US

Google has warned nonprofit newsrooms that a new California bill taxing Big Tech for digital ad transactions would jeopardize future investments in the U.S. news industry. “This is the second time this year Google has threatened to pull investment in news in response to a regulatory threat in California — but this time, hundreds of publishers outside of California would also feel the impact,” reports Axios. From the report: Google’s new outreach to smaller news outlets is happening in response to a different bill, introduced this year by State Sen. Steve Glazer, that would tax Big Tech companies like Google and Meta for “data extraction transactions,” or digital ad transactions. Tax revenue would fund tax credits meant to support the hiring of more journalists in California by eligible nonprofit local news organizations. With the link tax bill, Google only threatened to pull news investments in California. But the company is telling partners that the ad tax proposal will threaten consideration of new grants nationwide by the Google News Initiative, which funds hundreds of smaller news outlets, sources told Axios. Previous commitments, however, should be secure. A spokesperson for the Institute for Nonprofit News said the organization believes that grants previously committed through GNI as described here “are secure, so INN members should continue to benefit through this particular Fundamentals Labs program.”

Google’s concern, sources familiar with the company’s thinking told Axios, is that the new California ad tax bill could set a troubling wider precedent for other states. California’s Senate tax committee approved the “ad tax” bill May 8. Days after that, Google started making calls to nonprofits about potentially pausing future Google News Initiative funding, sources told Axios. Opponents argue (PDF) the ad tax burden would get passed down to consumers and businesses. They also say the measure would face legal challenges, similar to a digital ad tax introduced in Maryland last year.

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Feds Add Nine More Incidents To Waymo Robotaxi Investigation

Nine more accidents have been discovered by federal safety regulators during their safety investigation of Waymo’s self-driving vehicles in Phoenix and San Francisco. TechCrunch reports: The National Highway Traffic Safety Administration Office of Defects Investigation (ODI) opened an investigation earlier this month into Waymo’s autonomous vehicle software after receiving 22 reports of robotaxis making unexpected moves that led to crashes and potentially violated traffic safety laws. The investigation, which has been designated a “preliminary evaluation,” is examining the software and its ability to avoid collisions with stationary objects and how well it detects and responds to “traffic safety control devices” like cones. The agency said Friday it has added (PDF) another nine incidents since the investigation was opened.

Waymo reported some of these incidents. The others were discovered by regulators via public postings on social media and forums like Reddit, YouTube and X. The additional nine incidents include reports of Waymo robotaxis colliding with gates, utility poles, and parked vehicles, driving in the wrong lane with nearby oncoming traffic and into construction zones. The ODI said it’s concerned the robotaxis “exhibiting such unexpected driving behaviors may increase the risk of crash, property damage, and injury.” The agency said that while it’s not aware of any injuries from these incidents, several involved collisions with visible objects that “a competent driver would be expected to avoid.” The agency also expressed concern that some of these occurred near pedestrians. NHTSA has given Waymo until June 11 to respond to a series of questions regarding the investigation.

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