Cement typically comprises 10 to 12 percent of the entire mix. When cement is mixed with water, sand and gravel, it turns into concrete, the rock-like substance associated with sidewalks, roadways, building foundations, and more.lastic concrete exposed to a carbon dioxide source (CO2) during the concrete placing, finishing and curing period will develop a soft, chalky, carbonated surface, known as dusting. Carbon dioxide is an odourless and colourless gas that is heavier than air and is produced by all forms of combustion.
The BMW M3 placed second among sports cars in Consumer Reports 2014 reliability survey. The BMW 1 Series is the third most-reliable sports car, according to Consumer Reports' 2014 survey. The Toyota Prius is said to be the most reliable hybrid/electric car for the 2014 model year in a Consumer Reports survey.
As for styling and performance, Tesla chose a $100,000 sports car to enter the market as a way to establish performance DNA that would trickle down to less expensive models. Based on the Lotus Elise, the British-built Tesla Roadster is lightweight and svelte, capable of keeping up with other sports cars in its price bracket. Tesla promises 0-60-mph times around 4 seconds and a top speed of more than 130 mph. Throw in handling indicative of its Lotus roots and it should be obvious that the Roadster is one heck of a sports car. Tesla announced in February 2007 that it would be making a new sport sedan known as the WhiteStar, built at a new factory in New Mexico. The company plans on producing 10,000 units each year at a cost between $50,000 and $65,000 per car. Like the Roadster, it should have a range of about 250 miles, but with battery technology improving, that number could rise.