A40−Slabs-on-Grade

Employing nondestructive testing technologies throughout concrete’s life cycle

January 27, 2019

Traditionally, nondestructive testing (NDT) of concrete refers to testing, inspecting, or evaluating concrete materials or components without damaging or destroying the serviceability of the structure or materials. These tests have usually been performed on structures that have been in service for some time, but present-day technology allows the use of NDT methods during the construction of new concrete elements...

The new Royal Alberta Museum: Building on a legacy

April 4, 2018

Construction on the Royal Alberta Museum’s (RAM’s) new building in Edmonton is complete. At 38,926 m2 (419,000 sf), the new structure is twice the size of the former museum. Located in the heart of Edmonton’s Arts District, the new RAM is a careful blend of a well-designed structure and its historic content.

Spec Matters: Concrete floors, concrete success

October 19, 2016

“Look out everyone—the inspector is coming!” Whether it is an owner’s representative, a construction manager, or a ministry official, there always seems to be a heightened sense of duty and care when inspectors are on the job. It is natural for everyone to step up his or her efforts to do what is right when their work is being inspected.

Concrete Floors: Flatness vs. smoothness

September 11, 2015

There is a great deal of confusion in the world of flat concrete floor surfaces. On one side of the discussion are the people who place concrete floors—the concrete floor finishers.

Stable Joints for Concrete Floors: Differential movement versus load-transfer efficiency

July 6, 2014

Pavement engineers, who deal with many of the same issues faced in the concrete-floor field, do not talk much about joint stability or differential movement. Instead, they talk about load-transfer efficiency—a related but distinct property. Whenever a load is applied to one side of a joint, it creates stress on the loaded side. Load transfer occurs when some of that stress gets transferred to the unloaded side. Load transfer efficiency (LTE) is a measure of how well the joint shifts stress to the unloaded side.

Stable Joints for Concrete Floors: A new standard

July 6, 2014

A stable joint—one that does not move excessively when a load is applied near it—is obviously better than an unstable one. However, the best methods to make joints stable are not always agreed upon. For example, one floor designer might call for stout, closely spaced dowels, while another also chooses dowels, but makes them thinner and spaces them farther apart.

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