Concrete Placement and Finishing Defects: Causes, Evaluation, Repair, and Mitigation
Length: 24 Minutes
Concrete placement and finishing defects raised by a member of the project team may indicate a greater (unobserved) structural concern, a long-term durability issue, or simply an aesthetic problem. Concrete defects can delay the project schedule, require costly investigation fees, and necessitate removal and replacement. This presentation is intended to tackle concrete placement and finishing defects faced by the concrete construction industry. Topics will include: cold joints, delaminations, dusting, honeycombing, form leakage, plastic shrinkage cracking, floor flatness/levelness, in addition to others. This presentation will discuss the causes of these concrete defects, techniques for evaluating various defects, and approaches for mitigating these problems. Attendees will be introduced to various evaluation methods (e.g., impact-echo, ultrasonic pulse velocity, ground penetrating radar, concrete coring, petrographic examination, etc.) and when their use is appropriate. Case studies will be used to illustrate the concepts presented. This presentation will benefit anyone who has sat in a job site trailer to discuss concrete placement and finishing defects.
Jacob L. Borgerson is a Senior Associate with Wiss, Janney, Elstner Associates, Inc. He received a Ph.D. in Engineering from the University of Illinois at Urbana-Champaign. Dr. Borgerson specializes in providing concrete expertise in multiple areas including low strength, mass concrete, cracking, finishing defects, repairs, in addition to others. He is a member of the American Concrete Institute (ACI) and International Concrete Repair Institute (ICRI). He is a licensed professional engineer in 10 states, including Illinois and Texas.