The basic requirements for placing concrete are simple: preserve concrete quality which includes water/cement ratio, slump, air-content, and homogeneity; avoid separation of aggregate and mortar; avoid excessive horizontal movement; consolidate adequately; maintain sufficient placement capacity; and choose the right equipment for the concrete.
Here’s a compilation of a few tips through the years from everything from preparation and methods and achieving flatness to placing on a slope, in hot weather, and in ICFs.
February 1958: How to Place Concrete on a Slope
While it is not all uncommon to encounter jobs that require both vibrating and screeding concrete on a slope, it is quite unusual to find these two operations being performed simultaneously with the same piece of equipment.
June 1963: Concrete Construction Tips -- Placing
Everything from preparation to methods and vibration.
Here are a few hints on fast, economical ways of avoiding poor concrete when it is being placed during hot weather.
May 1995: 10 Steps to Placing Flat Floors
By now you have seen, or at least heard of, floor Flatness (FF) and levelness (FL) specifications. If you haven't had an opportunity to construct a slab to FF/FL specifications, you may wonder what steps are required to produce floors that pass the test (ASTM E 1155). A common specification for industrial applications with moderate to heavy vehicular traffic is FF35/FL25. The following 10 steps on placing the concrete to achieve good floors have proven successful.
December 1996: Tips for Placing Concrete into Insulating Wall Forms
The use of insulating concrete forms (ICFs) is one of the hottest trends in residential construction. But since concrete must be placed into ICFs at a slower, more controlled rate than with conventional forms, doing it correctly can be tricky.
October 2002: Steps to Placing a Superflat Floor
Superflat floors are not your typical concrete floors. ACI’s "Guide for Floor and Slab Construction," ACI 302.1R-96, defines a superflat floor (Class 9) as one with Fmin number greater than 100. Such floors have very specialized applications (narrow-aisle warehouses), but the techniques used to place these special floors can be used in less demanding applications or when required in specifications. Here are some useful tips on placing the concrete to achieve good floors.