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

Concrete Construction magazine has not published anything on this subject since the 1965 article. However, you may be interested in the following quotation from an article by William C. Panarese and Walter E. Kunze, "Proportioning and Control of Concrete Mixtures for Thin Shells," published in The Construction Specifier, December 1963:". . .The desired slump will vary somewhat depending on the steepness of the slope on which the concrete is to be placed. The steeper the slope, the lower should be the slump. The slump requirements will also depend on whether the concrete is lightweight or normal-weight. The following slumps for normalweight concrete are suggested:

  • less than 30-degree slope--2- to 4-inch slump
  • 30- to 45-degree slope--1- to 3-inch slump
  • more than 45-degree slope--double forming may be considered for concrete thickness of about 6 inches or more [or shotcrete should be used]
  • "Lightweight concrete of a given workability does not slump as much as normal-weight concrete due to the lighter weight of the aggregate. A 2-inch-slump lightweight concrete handles about the same as a 4-inch-slump normal-weight concrete. This property of lightweight concrete is especially desirable where very low slump concrete is required for steep shell slopes."The article shows a picture of a vibrating strikeoff riding on rigid pipe screeds being pulled up a slope to consolidate and shape 2-inch-slump lightweight concrete in a dome shell.