[VIDEO] U.S. Transportation Secretary Talks Future of Roads
U.S. Secretary of Transportation Elaine L. Chao talks about drones, autonomous vehicles and the future of our roadways.
Jul 18, 2018
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![Figure 1: SEM micrographs of polished section of alite sample exposed to portlandite solution for 1 hour from Juilland and Gallucci [8] Grain boundaries becomes visible as they are preferential sites for dissolution etching.](https://p1-cms-assets.imgix.net/files/base/acbm/fcp/image/2018/06/figure_1.5b242d063f54f.png?auto=format%2Ccompress&fit=crop&h=167&q=70&w=250)













