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Recharge Wrap-up: Ferrock a carbon-negative cement substitute, Audi makes e-diesel

A cement alternative uses recycled materials and traps CO2 rather than producing it. Invented by David Stone at the University of Arizona, Ferrock uses recycled steel dust and glass to produce a substance stronger than conventional concrete. Cement has a high carbon footprint from the high heat needed to process the limestone. Ferrock needs no such heat, and it actually uses CO2 to harden, making it, as Stone calls it, a carbon-negative material. Learn more in the video above, see the transcript at PBS NewsHour and read more at Green Car Reports. Teslarati offers a detailed rundown of Tesla's new Valet Mode feature for the Model S. Part of the Firmware 6.2 update, Valet Mode allows the owner to disable certain performance features and block personal information when letting someone else drive the car. It limits the car's to speed to 70 miles per hour, and caps output at 80 kW. It can also disable mobile app access, Homelink, Bluetooth and wifi and the "Places" function, which stores addresses for you. The folks at Teslarati did find some shortcomings in the new feature, though. Read more at Teslarati. Audi has produced its first batch of e-diesel made from water and CO2. The fuel is made by reacting hydrogen from the water with CO2 to make long-chain hydrocarbon compounds called "blue crude." That can then be refined similarly to crude oil to make e-diesel, which is a fuel free from sulfur and aromatic hydrocarbons. That e-diesel can be used on its own, or mixed with fossil fuel diesel to power a vehicle. "In developing Audi e-diesel we are promoting another fuel based on CO2 that will allow long-distance mobility with virtually no impact on the climate," says Audi Head of Sustainable Product Development Reiner Mangold. Read more in the press release below. Fuel of the future: Research facility in Dresden produces first batch of Audi e-diesel - The verdict: Pilot plant produces high-quality diesel fuel - No need for mineral oil: e-diesel made from water, CO2 and green power - Minister Wanka: "Synthetic diesel using CO2 is a huge success" Audi has taken another big step in the development of new, CO2 neutral fuels: A pilot plant in Dresden has started production of the synthetic fuel Audi e diesel. After a commissioning phase of just four months, the research facility in Dresden started producing its first batches of high-quality diesel fuel a few days ago. To demonstrate its suitability for everyday use, Federal Minister of Education and Research Prof.

Audi tests new kind of car sharing, lets you buy cars with buddies [w/video]

Car sharing services like ZipCar, Car2Go and others offer people in cities the chance to have a vehicle without dealing with the hassles of parking or maintenance, while also eliminating traffic. However, many individuals are turned off by the idea of splitting a car with an entire metropolis or would prefer to have a specific model at their disposal. For these unsatisfied souls, Audi has a new arrangement in Stockholm, Sweden, called Audi Unite that might be just the ticket. The setup is basically a small-scale car sharing service. Up to five people agree to share any of Audi's models for a year or two – even an R8 if they are so inclined. Each user has a special Bluetooth key fob that identifies them to the vehicle, and a smartphone app allows operators to schedule time with the car. Each person is then billed monthly according to his or her use. Audi thinks it might work best with friends, colleagues or neighbors, but the company can also play matchmaker for clients, if necessary. "In the beginning, our biggest fear was what if two people want to go somewhere at the same time-what happens then?" said Clemens Weisshaar, one of the founders of design firm Kram/Weisshaar that helped develop the idea, to Fast Company. "Interestingly, it never happened." They chose Stockholm because the city was tech-savvy, and there is a tradition of sharing there. Prices for Audi Unite seem fairly reasonable for each user. According to the service's website, if four people use an A3 Sportback for two years with a 20,000-kilometer (12,247-mile) driving limit, they would pay an average of 2,091 Swedish krona ($277) each per month. For an extra 365 krona (about $50) per person each month, they can add a package that includes vehicle pickup and delivery for monthly interior and exterior cleaning, winter tire exchanges and necessary servicing. After Stockholm, Audi plans to try Unite in other Swedish cities before launching the program in additional countries, according to Fast Company. Scroll down to watch a video with more explanation about how the program works and read the automaker's press release about the initiative.

Audi Prologue concept drives itself to CES with updated powertrain

What's the point in crafting a one-off concept car if it only gets to stand in the spotlight at one show? That's what automakers have been asking themselves recently, and the answer has, generally speaking, been to repaint their show cars, give them a bit of new tech and put them back on center stage. And the latest to do so is Audi, which has given its Prologue concept a new lease on life. The Prologue was originally unveiled at the Los Angeles Auto Show less than two months ago, showing the way forward for the future of Audi design, in an elegant coupe form that looked ready to take on the Mercedes S-Class Coupe. We even got a chance to drive it around the streets of LA, and when we did, we marveled at the concept's advanced infotainment system that caters a range of personal preferences according to who's on board. "It's easy to see how this could even reach for chauffeured, or autonomously driven vehicles" in the future, we said at the time. And it turns out Audi was on the same page. At CES this year, Audi has brought back the Prologue concept, given it a darker coat of grey paint, a grey-tone interior (instead of the previous shades of brown and tan), a fresh set of wheels and equipped it with the autonomous tech the German automaker has been at the forefront of developing. Though other automakers have been fitting their self-driving prototypes with all-electric powertrains, Audi kept the 4.0-liter twin-turbo V8 in place – but fitted it with a hybrid assist to drive output up from an already prodigious 605 horsepower and 516 pound-feet of torque to an even more impressive 677 hp and 701 lb-ft, dropping the 0-62 time down to 3.5 seconds. Now that's the kind of "piloted driving" tech (as Audi calls it) that we can get behind.