Title:
Air Entrainment and Delaminations
Author(s):
David R. Lankard
Publication:
Concrete International
Volume:
26
Issue:
11
Appears on pages(s):
21-30
Keywords:
DOI:
Date:
11/1/2004
Abstract:
Recently, the construction industry has given considerable attention to distress of concrete slab surfaces—namely blistering and delamination. In the analyses of slab delaminations to date, most view air entrainment as one of many variables that can affect the entrapment of bleed water. Observations made during petrographic examinations of air-entrained concrete support a hypothesis that the physical forces caused by troweling can be responsible for creating delaminations. These issues are explored in the remainder of this article, using examples of nonair-entrained and air-entrained concrete slabs that have exhibited blistering and delamination distress.