Table of Contents July 1999

Pros and Cons of Air-Content Measuring Methods

Of the three methods for measuring air content--pressure, volumetric, and gravimetric--which one is the most reliable?

When to Add the Air-Entraining Agent

At our precast plant, we put the air-entraining agent on the fine aggregates during batching. I've heard that it should be added with the mixing water. Is our procedure incorrect?

How Concrete R-value, Density, and Strength Relate

We're thinking of developing a 6-inch-thick precast concrete residential wall system made with lightweight aggregates.

Keeping the Good Times Going

Beating the Heat Is No Game of Chance

Returns on Reinvestment

Everyday Coolant Protection

Educating the Market About Quality