Title:
Concrete Q&A: Dominant Joints in Concrete Slabs-on-Ground
Author(s):
Scott M. Tarr
Publication:
Concrete International
Volume:
38
Issue:
7
Appears on pages(s):
67-68
Keywords:
DOI:
10.14359/51689128
Date:
7/1/2016
Abstract:
As a designer of industrial concrete floors, I’ve always placed a priority on reducing the potential for slab cracking. One of the approaches I have used is to minimize restraint to drying shrinkage by lowering friction on the underside of the slab. For example, I might specify a layer of sand on top of a crushed stone base to choke off the surface of the stone and create a smooth interface between the base and slab. Recently, however, some contractors and owners have expressed concerns regarding “dominant joints.” What are dominant joints and how can they be avoided?
Related References:
1. ACI Committee 302, “Guide for Concrete Floor and Slab Construction (ACI 302.1R-15),” American Concrete Institute, Farmington Hills, MI, 2004, 76 pp.
2. ACI Committee 360, “Guide to Design of Slabs-on-Ground (ACI 360R-10),” American Concrete Institute, Farmington Hills, MI, 2004, 72 pp.
3. ACI Committee 301, “Specifications for Structural Concrete (ACI 301-16),” American Concrete Institute, Farmington Hills, MI, 2004, 77 pp.
4. ACI Committee 117, “Specifications for Tolerances for Concrete Construction and Materials (ACI 117-10),” American Concrete Institute, Farmington Hills, MI, 2010, 76 pp.