Technologies for keeping concrete flowing and helping it to heal itself proved to be popular with Construction Dive readers this week. Our biggest news posts from the last few days pointed to some developments with big potential, as well as a look at Google's HQ and a Defense Department report that praises green building.

Want to know more? Check out the links below:

• There are ways to keep concrete moving when cold weather is trying to stop it: Contractors who work in cold climates know tricks to keep concrete booms warm enough that the mixture keeps flowing even when temperatures are plunging.
• OSHA imposes fine in roof worker's heat-related death; contractor is contesting fine: A temporary employee of Dayton, Ohio,-based A.H. Sturgill Roofing Inc. was on a roof on an 82-degree day last summer when he suffered heat stroke.
• Rendering of Google headquarters shows a worker-to-worker web: Google's latest foray into building a new headquarters in Mountain View, Calif., would have a collection of bent buildings that form courtyards, are connected and put every worker within 150 seconds of every other worker.
• Dutch scientists announce self-healing concrete: In the wake of Korean scientists' devising a self-activated coating, Dutch scientists announced a bacterial mix-in patch which activates when water gets in the small cracks in concrete.
• Defense Dept. report: Green buildings save money: The National Research Council says the Defense Department is on the right track in requiring LEED Silver or better for new construction and large renovations.

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