Construction stocks have been improving, and there was fresh evidence of that trend in Friday's new highs. The cement and construction aggregates industry group has climbed into the top 20 of 197 groups, while the construction products group was No. 10 in Friday's edition. U.S. Concrete (NASDAQ:USCR) capped a 33% two-week surge with a gain of 0.45 to 56.45 Friday. The stock started its rally when it reported earnings Aug. 6 that beat expectations. Energy Focus (NASDAQ:EFOI) soared 5.47, or 40%, to 19.18 in heavy volume, reaching a nearly five-year high. There was no news on the company Friday. The maker of LED lighting products... More