March 1999 Table of Contents

Features Don't Use Loose Sand Under Concrete Slabs

Will using a thin sand layer under floor slabs reduce subgrade or subbase support, causing cracking and poor joint performance, especially under repeated loadings such as forklift traffic? To gather data to help answer this question, The Aberdeen Group performed California Bearing Ratio tests on three soil samples with varying dry densities. Read more

Features Footings in a Flash

Convinced there had to be an easier way to form concrete footings, builder Richard Fearn invented and patented two fabric forming systems that overcome many of the disadvantages of using lumber. Read more

Features A Winning Combination

When Whiteman Industries, a division of Multiquip Inc., Carson, Calif., built a new 134,000-square-foot manufacturing facility in Boise, Idaho, in 1998, it hired Concrete Northwest of Idaho to do all the concrete work. Whiteman also gave CNI a unique opportunity: the chance to test drive the latest Whiteman line of placing and finishing equipment. Read more

Features A Closer Look at Bridge Expansion Joints

Years ago, many bridges had unsealed joints. A simple gap in the deck accommodated small movements, and finger-plate joints or similar systems accommodated larger movements. Read more

Features Forms For All Functions

A first-time exhibitor at World of Concrete, Doka Formwork Technology is a full-line formwork supplier with principal factories in Austria and Germany, and other facilities in more than 16 countries around the world. Read more

Features Using Shrinkage-Reducing Admixtures

Within the last few years, major U.S. admixture suppliers have introduced a new category of chemical admixtures—shrinkage-reducing admixtures (SRAs). Read more

Products Solving Problems Large-Panel Insulating Wall Forms

The Insul-form Building System, developed in Canada, is an insulating concrete form system made up of large expanded-polystyrene panels each with an outer layer of oriented strand board (OSB). Read more

Close X