ForConstructionPros.com

Article contributed by Ingersoll Rand.

There are so many variables on construction projects that logistics never seem to go according to plan. Earthmoving projects experience problems with material gradation and moisture content. Plant operations, hauling logistics and mix laydown are fraught with interruptions on paving projects. There are so many impediments to achieving success, it can be surprising when construction projects are completed in accordance with agency specifications.

"Intelligent Compaction" in Concept and Practice
Compaction is one of the most important stages in the construction process. Without proper compaction or densification, materials cannot provide the support needed for structures or traffic loads.

Many believe that the process of compaction involves science. Others believe compaction is simply the application of practical techniques, using relatively simple equipment.

Proponents of the "science of compaction" are encouraging the construction industry to require sophisticated equipment to achieve what is called "intelligent compaction." The problem with this concept is that materials in construction are not uniformly ideal for the applications for which they are being used. Soils on earthmoving projects vary in properties, especially in moisture content. Improper field moisture content is the main factor in failing to achieve soil density. Knowing this, how practical is a requirement to use "intelligent compaction" equipment on these materials? Can the compactor compare a low soil stiffness modulus resulting from high air void content with a low modulus level caused by high field moisture content?

On a hot mix asphalt (HMA) paving application, can any compactor distinguish between rises in pavement stiffness resulting from increasing density and increased stiffness caused by cooling of the mix?