05-08-2017, 05:23 AM
Concrete International May 2017 V. 39 No. 5
Author(s)/Editor(s): American Concrete Institute | Size: 9.12 MB | Format: PDF | Quality: Original preprint | Publisher: American Concrete Institute | Year: 2017 | pages: 72
Author(s)/Editor(s): American Concrete Institute | Size: 9.12 MB | Format: PDF | Quality: Original preprint | Publisher: American Concrete Institute | Year: 2017 | pages: 72
ded overlays of equal thickness. Over 30 years of Swedish research indicates that a durable bond between the overlay and the existing concrete can be achieved with proper removal, surface preparation, placement, and curing.
Composite Strengthening of a Bridge
The four-span concrete Buhung Bridge, located in Gyeonggi, South Korea, was constructed in 1960 and has since been exposed to heavy traffic from a nearby military base. One span of the bridge was recently strengthened with post-tensioned, near-surface-mounted carbon fiber reinforced polymer rods. Dynamic load tests show that the stiffness of the span has been improved significantly.
Evolution of ACI 562 Code—Part 11
The eleventh in a series discussing the 2016 edition of the ACI 562 Code, this article focuses on Chapter 8 of the Code and durability of concrete repairs. Topics include causes of deterioration, cover and equivalent cover, corrosion of reinforcing steel, and concrete cracking.
Deployment of Composite Reinforcing
Although fiber reinforced polymer (FRP) reinforcement has demonstrated great potential for improving the durability of concrete transportation infrastructure, adoption has been slowed by a lack of a unified strategy for deployment. Citing the successful introduction of prestressed concrete technology as a precedent, the authors call for development, publication, and sharing of standards and design guides for FRP applications.
Products & Practice Spotlight: Rehabbing Aging Infrastructure
Polyurea coatings and liners can provide strong, flexible, damage-resistant dampproofing in wastewater infrastructure rehabilitation projects. With the proper crack repair and surface preparation, coatings can be applied directly to the concrete over a wide temperature range. Rapid curing helps to minimize facility downtime.
Knowledge to Practice: ACI Foundation
ACI Officers for 2017-2018
ACI’s Award-Winning Papers and Articles
During The ACI Concrete Convention and Exposition – Spring 2017 in Detroit, MI, 12 authors and researchers received awards of excellence for their published work.
ACI Technical Committee Chairs Appointed
Before The ACI Concrete Convention and Exposition – Spring 2017 in Detroit, MI, the ACI Technical Activities Committee (TAC) selected Chairs for 30 ACI technical committees. These actions became effective after the convention.
Concrete Q&A: Evaluation and strengthening of members in existing structures
Q. I am the licensed design professional (LDP) for a team conducting a structural evaluation of a reinforced concrete building that was completed in the mid-1960s. We’ve determined that many elements in the floor structures do not comply with requirements in the ACI 318-14 Code.1 For example, shallow beams have stirrup spacing exceeding d/2, and deep beams do not satisfy ACI 318-14 requirements for horizontal and vertical reinforcement areas and spacing. To compound these issues, the floor live load is being increased due to a change in use. Are there any ACI Code provisions that address these issues?
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