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Introducing New TechNotes
Tuesday, October 19, 2021 10:00 AM - 12:00 PM
The TechNotes produced by ACI Committee 364 cover important aspects of concrete rehabilitation programs, ranging from the initial stages of evaluation, to designing and implementing durable repairs that achieve a long service life.
(1) Identify important concrete repair material properties related to shrinkage, bond strength and testing to assure durable repairs;
(2) Describe how to accurately establish reduced cross-sectional area of reinforcing to assess reduced load-carrying capacity of members;
(3) Name key techniques for for evaluating bond performance between repair material and concrete substrate to ensure long service life;
(4) State methods for designing durable repairs to railing anchorages on concrete balconies;
(5) Describe cracking in repairs – causes and impact, and measures to minimize and remediate.
This session has been approved by AIA and ICC for 2 PDHs (0.2 CEUs). Please note: You must attend the live session for the entire duration to receive credit. On-demand sessions do not qualify for PDH/CEU credit.
Section Loss Determination of Damaged or Corroded Reinforcing Bars (364.14T)
Presented By: Pawan Gupta
Affiliation: Pcubed Associates Inc
Description: Section loss in reinforcing bars typically occurs from corrosion but also due to damage during construction, from cutting or drilling. Whether deformed, square, round, coated or uncoated, it is critical that designers accurately establish section loss, or more importantly, the remaining cross-section. A method for establishing the percentage of section loss in reinforcing bars is presented as an aide to the engineer in evaluating the reduced load-carrying capacity of a member.
Repair of Railing Anchorages in Reinforced Concrete Balconies (364.T)
Presented By: Kevin Conroy
Affiliation: Simpson Gumpertz Heger
Description: Whether an occupant is enjoying a waterfront or urban view or just grabbing a quick breakfast before an early ACI TRRC meeting at 7:30 in the morning, railings play a crucial role in balcony protection. Unfortunately, embedded rail posts allow water to infiltrate the concrete and lead to deterioration of the anchorage or embedded reinforcing leading to reductions in capacity. This presentation describes considerations for achieving successful anchorage repairs to strengthen deficient conditions and provide durable, long term solutions allowing continued views from the balconies.
Pull-Off Test for Quality Assurance and Bond Performance (FAQ 26 / 364.T)
Presented By: Marjorie Lynch
Affiliation: Jensen Hughes
Description: A key requirement for surface repairs or bonded overlays is development of an adequate bond to the concrete substrate so that the repair or overlay remains bonded throughout its service life. Evaluation of tensile bond strength by an in-place pull-off test is a measure of bond strength at the time of testing but may not be a good predicter of long-term bond performance. The presentation examines in-place pull-off testing and its use as part of a quality assurance program, discussing limitations in predicting long term performance of a repair.
Cracks in Repair (364.9T)
Presented By: Ali Abu-Yosef
Affiliation: Pivot Engineers
Description: Cracking in repairs can negatively affect the durability and the load-carrying capacity of the repaired structure. This presentation examines the common causes of cracking in repairs and the potential impact of cracks on the performance of the repaired structure. The parameters considered when evaluating the acceptability of repair cracking will be discussed. In addition, the presentation will include examples of design and construction measures typically used to control cracking in repairs and remediate unacceptable cracks.
Significance of Shrinkage-Compensating and Non-Shrink Labels on Packaged Repair Material (364.15T)
Presented By: Benoit Bissonnette
Affiliation: Laval University
Description: Manufacturer’s product literature commonly omits adequate information for users to understand how a repair material behaves when it is described as “shrinkage-compensating” or “non-shrink”. Proprietary repair material data sheets often do not explain the meaning of these terms and too often misuse them. Restraint conditions develop along concrete substrates that influence shrinkage, thus designers need to consider these material properties and the expected performance on bond surfaces. This presentation provides clarification on the significance of these terms when encountered in product literature and data sheets. And in this sense it serves as a perfect example of why Fred Goodwin was the champion of creating a Data Sheet Protocol for repair materials (ACI 364.3R / ICRI 320.2R).