July 1983 Table of Contents

Features Thermal Mass of Concrete

Thermal mass relates to the ability of a material to store and release heat. Read more

Features Earth-Sheltered Nature Center

To build a nature awareness center that did not disrupt the natural environment, the structure chosen was an earth-sheltered, earth-integrated concrete building heated by passive solar energy with electricity provided by a wind generator and hot water by solar collector panels. Read more

Features Saving Energy with Concrete

The world supply of readily usable energy is finite and woefully short for the projected needs of an ongoing industrial society. Read more

Features Lightweight Concrete Acts as Insulation

Lightweight concrete weighs substantially less than concrete made with gravel or crushed stone aggregates. Read more

Features Insulation for Concrete Walls

Research and experience show that heating costs can be substantially reduced, especially in colder climates, by insulating concrete walls. Read more

Problem Clinic Nailable Concrete

We've had a recent inquiry about how to make nailable concrete. We recall that sawdust concrete was promoted for this purpose at one time. Is there anything new on the subject? Read more

Problem Clinic Segregation Based on Aggregate Source

I have a problem with concrete segregation that appears to be related to the coarse aggregate. When we use crushed stone from one source the concrete segregates in the chute of the mixer truck. When we use stone from another source we get no segregation. Read more

Problem Clinic Showing Whether Moisture Comes From Above or Below

In South Florida we have a recurrent problem with moisture on top of the slabs in houses and warehouses. We have devised a simple test that consists of using paper towels to dry up the water on top of the slab, then chipping off some concrete to expose ma Read more

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