Fly ash is a byproduct from burning pulverized coal in electric power generating plants. During combustion, mineral impurities in the coal fuse in suspension and float out of the combustion chamber with the exhaust gases. As the fused material rises, it c
Wal-Mart Stores Inc. has changed their construction specifications to require all interior steel-troweled concrete floors placed at Wal-Mart Stores, Supercenters, Neighborhood Markets, Sam's Clubs, and Distribution Centers to contain 15% to 20% fly ash by
Although power trowels often are used for their speed and efficiency to finish large slab areas, hand tools are still required for slab edges, steps, and other tight areas where power trowels can't maneuver. And hand tools are still the best way to finish smaller slabs, such as residential flatwork. But in order for these tools to work their magic, finishers must choose the right tool for the job, know how to use it properly, and understand the importance of timing. Here are tips for using the basic finishing tools needed by most flatwork contractors: bull floats and darbies, edgers, groovers, hand floats, and steel trowels.
Because corrosion of reinforcement can result in concrete cracking, staining, spalling and costly repairs, corrosion-resistant reinforcement often is the obvious choice for concrete structures exposed to high chloride levels.
Few contractors would take on a large, elaborate foundation project requiring corner angles of 90, 135, 142, and 153 degrees and wall thicknesses of 8, 10, 12, 14, 16, and 34 inches.
