Title:
Lightweight Concrete Delamination: Causes, Identification, Repairs and Solutions
Author(s):
Kozikowski
Publication:
Web Session
Volume:
ws_S23_Kozikowski.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
4/2/2023
Abstract:
We continually see surface delamination in hard troweled lightweight concrete even though this issue should be avoidable for the most part. Delamination is typically due to hard troweling concrete with air contents exceeding 3%. There is no difference between a 3% requirement for normal weight or lightweight concrete; however, air is often purposely entrained in lightweight concrete to help reduce density or to assist pumping. Lightweight concrete intended for use in hard troweled slabs should not be air entrained. Common issues associated with the use of air entrainment in lightweight concrete are related to density, pumpability, and fire rating. This presentation will discuss these issues and for situations where delamination have become an issue, we will discuss options for identifying and repairing these defects.