10-08-2017, 06:56 AM
Concrete International October 2017 No. 10 Complete Issue
Author(s)/Editor(s): American Concrete Institute | Size: 10.94 MB | Format: PDF | Quality: Original preprint | Publisher: American Concrete Institute | Year: 2017 | pages: 100
Author(s)/Editor(s): American Concrete Institute | Size: 10.94 MB | Format: PDF | Quality: Original preprint | Publisher: American Concrete Institute | Year: 2017 | pages: 100
Precast Concrete Pavement Innovations
Precast concrete pavements (PCPs) have been shown to be promising alternatives for repair and rehabilitation of the aging highway infrastructure in the United States. The article presents details on technical considerations related to design, fabrication, and installation of PCPs, especially concrete requirements, joint spacing, support conditions, load transfer at joints, panel reinforcement and prestressing, and panel production and installation rates.
Banding Together to Reach Out
To create a perimeter band of free-flowing workspaces with maximal views of the surrounding landscape at the Novartis Oncology Research Building in East Hanover, NJ, the designers significantly set back the columns from the façade, resulting in long-span cantilevers and large, column-free expanses. The challenges with the quantity and density of a bonded post-tensioning system necessary to meet performance requirements could only be met through open, creative, and precise collaborative efforts between the owner, builders, manufacturers, installers, and designers.
Integrating Precast Cladding and Structure
In regions with high seismic risk, a precast hybrid moment frame (PHMF) is an optimum system for combining cladding and structure. The PHMF comprises high-quality precast column and beam elements, produced under factory-controlled conditions, that are connected using traditional construction methods and materials. The system is self-righting—the elastic, unbonded post-tensioning is designed to overcome yielding in the frame and pull the building back to a righted position.
Analysis and Design of Double-T Flanges
Pretensioned concrete double-T members are widely used as floors in parking garages. Uniformly distributed live load usually governs pretensioned design of the member in the main span direction, and the concentrated load usually governs the design of the overhanging outer flanges of the slab portion of the member. The article compares flange moments determined using elastic plate theory, various assumptions following the approaches given in the PCI Design Handbooks, yield-line theory, and consideration of the loadings suggested by Malik.
Post-Tensioning Institute 2017 Project Awards
The Post-Tensioning Institute (PTI) announced its 2017 Project Awards during the 2017 PTI Convention Awards Dinner in Atlanta, GA, in May.
ACI Chapters are Pivotal to ACI’s Mission
ACI's 93rd President, Michael J. Schneider, summarizes his 2016 and 2017 visits to multiple ACI Chapters, as a fulfillment of his mission to strengthen the relationship between ACI National and the local chapters. During those visits, he met many dedicated people interested in helping ACI fulfill its mission and vision. He also observed that the best ACI Chapters have members from all areas of the concrete industry and provide programs that are of interest to these various segments.
ACI Student Chapter Activities
Eastern Pennsylvania and Delaware Chapter – ACI Hosts Student Beam Competition, USFQ Student Chapter – ACI Visits Subway Project in Ecuador, AASTMT Student Chapter – ACI FRC Bowling Ball Competition, FIU Student Chapter – ACI Teams Place in Concrete Bowling Ball Competition, Kansas Chapter – ACI Awards $6000 in Scholarships, Maryland and National Capital Chapters – ACI Award $55,0000 in Scholarships, Nebraska Chapter – ACI 2017 Richard T. DeLorm Scholarships, 2017 ACI Student Concrete Cylinder Competition in Qatar, Universidad de Sonora Student Chapter – ACI Concrete Plant Tour, Université Laval Student Chapter – ACI Conference on Concrete Expertise, Recent Award-Winning Student Chapters.
Recent ACI Chapter Awards and Achievements
Nebraska Chapter – ACI Awards of Excellence, Eastern New York Chapter – ACI Celebrates 50 Years, Rocky Mountain Chapter – ACI Excellence in Concrete Awards, San Diego International Chapter – ACI Looks Back on 50 Years.
ACI Chapter Directory
Dangers of Silica Dust
Inhalation of "respirable crystalline silica" (particles size less than 5 micron [0.2 mil]) can result in silicosis and lung cancer. These small dust particles can be created by chipping, drilling, grinding, diamond polishing, and sawing materials containing crystalline silica, such as concrete and stone. The new OSHA regulations regarding silica exposure for construction that went into effect on September 23, 2017, and their implementation by tool manufacturers, are discussed.
Concrete Q&A: Acceptance Testing Requirements in ACI Standards
Q. The last paragraph in the August 2017 Q&A states that ASTM C31/C31M1 allows only standard-cured specimens to be used for acceptance testing for specified strength. Could you expand on that? What do ACI documents state?
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