Title:
Investigation of Popout and Scaling in Concrete Driveways
Author(s):
Mohsen A. Issa, Mahmoud A. Issa, and Ahmad M. Hammad
Publication:
Concrete International
Volume:
16
Issue:
8
Appears on pages(s):
63-66
Keywords:
compressive strength; concrete; concrete durability; deterioration; Construction
DOI:
Date:
8/1/1994
Abstract:
This paper presents an investigation on the cause of concrete deterioration in the Eagle Ridge subdivision driveways of the Village of Oak Lawn, Illinois. Five locations were selected for the field and laboratory investigation. As a result, these driveways were investigated for concrete deterioration and pop out of parts of the finished surfaces due to scaling problems. The analysis involved the determination of: 1) chloride ion concentration as a function of depth (RCT method), 2) compressive strength (ASTM C 42), and 3) petrographic analysis (ASTM C 457) using the linear traverse and modified point count methods. The laboratory investigation indicated that the cause of this concrete deterioration problem was attributed to inadequate finishing of the concrete surface. Floating tends to bring the cement and water to the surface, thus, damaging and weakening the bond between the surface and the concrete below, byjoining a high water-cement ratio layer of paste ranging between 3 to 9 mm in thickness. As a result of this study, the contractor agreed to pay for 50 percent of the costs that include materials and labor.