The real estate agent I worked with when buying a house told me of an old saying about concrete, "There're two kinds of concrete. The kind that's cracked, and the kind that's going to crack."
Concrete can also show superficial/cosmetic surface damage through a process known as "spalling", which occurs when water absorbes beneath the surface and freezes. As the freezing water expands, it pushes on the top surface of the concrete, causing it to "pop" off, creating surface flaking. Spalling can also be caused as steel rebar within the concrete begins to rust and deteriorate -- the expansion in volume caused by the rusting will put pressure on the surface and cause it to pop off. One final way that spalling can occur is when de-icer salt collects deep in the pores of concrete and recrystalizes -- the buildup of these crystals will also create sufficient expansion to lead to salling.
Stamped concrete can be designed to look like different materials or have various appearances, and has become increasingly popular and sophisticated in recent years. Sometimes it's also stained, and it can be made to look similar to stone, tile or other materials.
Sometimes when slabs of concrete become tilted or uneven, they can be "leveled" instead of replaced. Some companies specialize in the repair of concrete or masonry for residential properties, while others focus on public (municipal), industrial or commercial structures. However, if the unevenness of a concrete slab is due to significiant settlement issues, leveling methods must be carefully considered, as future settlement may occur.
Concrete can be recycled.
- Wikipedia's article on concrete
- Wikipedia's article on concrete leveling
- Concrete Maintenance Basics by Eric Brennan, Yahoo! Contributor Network
- AllAboutDriveways.com on Concrete Driveways: Is A Concrete Driveway The Right Choice For Your Home?
Commercial sites (since this site is for homes, try to limit the sites to ones that do residential work)
- GreeneConcreteLeveling - in northeast Ohio, credited by Wikipedia with coining the term concrete leveling
- Concrete Leveling Inc. - Michigan, northwest Ohio
- Atlas Concrete Leveling - Ohio, has a photo gallery and high level information about their process
- A-1 Concrete Leveling - has franchises with locations around many parts of the continental U.S.