Most Popular

• Nominal Weight of Standard Concrete

  What's the nominal weight of standard concrete?

   

• Moisture Problems with Concrete Slabs

  Why does it seem that moisture-related flooring problems are more common today than in the past?

   

• R-Value of Concrete

  What is the R-value of a typical 8-inch-thick, cast-in-place, residential basement wall?

   

• All articles in Most Popular

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1990s

• Does Fogging Increase Water-Cement Ratio?

  When using a fog spray to prevent plastic shrinkage cracking during a concrete flatwork placement, aren't you taking a chance that the water-cement ratio at the surface will increase, reducing concrete quality?

   

• Hydrophilic vs. Hydrophobic Polyurethane Grouts

  What's the difference between hydrophilic and hydrophobic polyurethane grouts? Whenever I ask anyone, they say that hydrophilic grouts "love water" and hydrophobic grouts "hate water," but this means nothing to me when I'm trying to select a grout for a certain application. When should each be used?

   

• Effect of High Temperatures on Concrete

  I'm a distributor of concrete repair materials that are often used in steel manufacturing plants.

   

• All articles in 1990s

1980s

• Maximum Permitted Slump When Slump Isn't Specified

  We are bidding a concrete project on which slump doesn't seem to be specified. In the specifications there is reference to ACI 301, "Specifications for Structural Concrete for Buildings," and to ASTM C 143, Standard Test Method for Slump of Hydraulic Ceme

   

• Painting Concrete in Bright Colors

  Where can we get a deeply colored paint for concrete, one that is highly saturated with primary color? We need it for a multiuse building 600 feet tall. The owner wants several bright colors, not the stains, pastels, and earth tones commonly used on concr

   

• Protecting Concrete Exposed to Hydrofluoric Acid

  We re replacing concrete floors, pads, and pedestals damaged by hydrofluoric acid spills in an oil fuel processing plant. The acid is at ambient temperature and concentration varies from 10% to 60%. How do we protect the new concrete so it doesn't deterio

   

• All articles in 1980s

1970s

• Removing Acrylic Seal Coat From Tilt-Up Walls

  The finisher applied too much seal coat to some of the tilt-up panels for a post office building. Most of the panels with normal amounts of seal coat look fine, but where it has been applied thickly it has yellowed. It is reputed to be an acrylic. We have

   

• Dry shakes good or bad?

  I am responding to your April 1979 special issue on concrete finishing. The author of the articles often referred to applying a dry shake when the concrete has started to set but before the water sheen has disappeared. I always thought that the dry shake was a bad concrete practice and highly...

   

• Concreting on a slope

  In June 1965 you published an article "Concreting Inclined Planes" (page 205). We would appreciate additional information relating to concreting on inclined planes.

   

• All articles in 1970s

1960s

• Insulating concrete block

  I am using 8-inch, 3-core concrete blocks in the construction of residences and some stores. How can I avoid cold, damp walls (sweating walls)?

   

• Shielding concrete

  I have a job requiring heavyweight shielding concrete. How do I get this type of concrete?

   

• Surface Cracking

  We have been experiencing a considerable amount of surface cracking. How can this be prevented?

   

• All articles in 1960s

1950s

• Preventing laitance

  How can laitance be prevented?

   

• Radioactive buildings?

  Is there any truth to reports that concrete buildings are radioactive?

   

• Joint Venture to Find

  What is the legal meaning of a joint venture as applied to a construction project? What about liability?

   

• All articles in 1950s