Title:
Contraction Joints for Residential Post-Tensioned Slabs
Author(s):
Harvey Haynes and Kenneth B. Bondy
Publication:
Concrete International
Volume:
42
Issue:
7
Appears on pages(s):
33-35
Keywords:
crack, design, moment, edge
DOI:
10.14359/51727003
Date:
7/1/2020
Abstract:
Contraction joints are not commonly used in residential post-tensioned (PT) slabs-on-ground. However, they are permitted by the Post-Tensioning Institute as means to minimize random cracking and improve appearance of a slab. The article discusses importance of contraction joints in PT slabs, determination of a joint layout, and available installation methods.
Related References:
1. Bondy, K., “Cracking in Ground-Supported Post-Tensioned Slabs on Expansive Soils,” PTI Technical Notes, No. 6, Post-Tensioning Institute, Farmington Hills, MI, Aug. 1995, 6 pp.
2. PTI DC10.1-08, “Design of Post-Tensioned Slabs-on-Ground,” third edition with 2008 Supplement, Post-Tensioning Institute, Farmington Hills, MI, 2008, 156 pp.
3. ACI Committee 332, “Residential Code Requirements for Structural Concrete (ACI 332-14) and Commentary,” American Concrete Institute, Farmington Hills, MI, 2014, 54 pp.
4. “Design and Construction of Post-Tensioned Slabs-on-Ground,” second edition, Post-Tensioning Institute, Farmington Hills, MI, 1996, 101 pp.
5. Superior Profiles, Inc., 2014, www.superiorprofiles.com.
6. Wood, G., “New Tool for Slab Joints Reduces Concrete Cracking,” Concrete Contractor, Jan. 2020, pp. 14-16.