William F. Perenchio

William F. Perenchio's Posts

• Features

  Joints, Shrinkage, and Slab-Edge Support: An Open Challenge to ACI 302

  by William F. Perenchio

  A very important part of providing a durable concrete slab on grade is the proper treatment of control joints and construction joints. Support of the slab edges is one aspect often overlooked.

• Features

  Finishing Too Early

  by William F. Perenchio

  Troweling the surface of a slab while the concrete is still bleeding.

• Features

  Carbonation

  by William F. Perenchio

  Reaction between carbon dioxide and a hydroxide or oxide to form carbonate, especially in cement paste, mortar, or concrete

• Features

  The Real Truth About the Effects of Deicers

  by William F. Perenchio

  The results of a study conducted in the mid-1950s show that it's not high concentrations of deicers that cause the heaviest scaling, but relatively low amounts in the range of 2% to 4%.

• Features

  The Drying Shrinkage Dilemma

  by William F. Perenchio

  Many designers of concrete structural elements know that concrete shrinks when it dries, but they often fail to consider this in their designs. Article describes the possible consequences of drying shrinkage, including failures at filled joints, slab curling, and excessive cracking.