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?

     
  • Repairing a Pitted Floor

    How does one go about repairing a badly worn and pitted concrete floor?

     
  • Correct Dusting

    Can you suggest how to correct a severe dusting condition on a factory floor?

     
  • Coarse-Aggregate Floor

    If specifications call for a 1:2 cement-sand floor topping, would you suggest using a mix containing coarse aggregate?

     
  • Value of Yield Charts

    Of what value are yield charts?

     
  • Class 6 Floors

    In your first installment of "Elements in Good Floor Construction" in the March 1969 issue, it is stated that "the topping should have no structural function" in Class 6 floors. Why should this statement be applicable to toppings installed monolithically

     
  • When to Use Vapor Barrier

    It is indicated in your publication that most floor construction is improved by including a vapor barrier. There are a number of experiences in our area that indicate the use of a vapor barrier may not be advisable. The water in a concrete slab placed on

     
  • Crack-Free Concrete Fill

    We would like to know what the formulation of concrete fills placed over structural slabs should be so that the installation of thin-set floor coverings such as epoxy, neoprene, acrylic, etc. will be crack-free.

     
  • Problem of Crack Control

    Would you discuss the solution to the problem of crack control by suitable spacing of control joints or sawed joints in the slab, particularly when the slab is assumed to provide bending resistance to the longitudinal girders spanning between columns and

     
  • Mixing With Sawdust

    In an article on acid etch, reference was made to combining sawdust with a mixture of hydrochloric acid and water. I would like to know a recommended method of mixing the hydrochloric acid-water with the cement. Would it be advisable to mix it in a small

     
  • Black Concrete Powders

    I poured a concrete drive, dusted and floated in black Colorundum, and sprayed with "60 D" curing compound. There were about five pours involved to complete the driveway. Some pours were rained on during the night after the pouring. In varying degrees, wh

     
  • Floor in Damp Basement

    I have a particular problem with a damp basement in a new home. The floor seems to change color and darken in the center of the room and toward the walls.

     
  • Water of Convenience

    What does the term "water of convenience" mean?

     
  • Copper and Concrete

    Does embedding copper in concrete present problems?

     
  • Pipe as Formwork

    What are the advantages of using steel pipe as permanent formwork for building columns?

     
  • Driveway Paving

    I would like some information on paving concrete outside (driveway) with the concrete being heated in winter. Heating will be done with hot water. The concrete will be 12 by 50 feet. What pound concrete should I use and what thickness. Should I put wire i

     
  • Concrete Topping

    Please tell me how to correctly prepare and apply a concrete topping. We recently placed a slab, and then topped it with a mixture of 1 part cement and 3 parts sand. The slab was given a broom finish before the topping was applied. We did not use a bondin

     
  • Floor Finishing

    I have been placing quite a few concrete floors that are scored in 32-inch squares. The finish on these floors is hand troweled. When completely cured, the floor is either acid stained and waxed or simply waxed. I usually use a black wax. My problem is th

     
 
 
 
 

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