Concrete International June 2015 No. 6 Complete Issue
Click on the cover image for the flip book version.
Modeling and Forming the Turkish American Community Center
The Turkish American Community Center (TACC) in Lanham, MD, is a reinforced concrete structure comprising a mosque, Turkish bath, parking structure, and additional assembly spaces. A three -dimensional model of the structure was prepared to allow for detailed coordination of the concrete work on the project as well as resolution of potential constructibility issues. The model was provided to the general contractor and the formwork vendors. The five forming systems that were ultimately required to construct the project are briefly described.
Construction of Undulating Walls Using Dry-Mix Shotcrete
The undulating walls at the entry hall of the Museum of History of Polish Jews in Warsaw, Poland, were constructed using a stay-in-place form and the dry-mix shotcrete process. To avoid cracking of the walls, a support system was designed to distribute and disperse stresses from the anchorage points into the wall sections. To maintain a uniform thickness of shotcrete and delineate the outer surface, specially designed polymers strips were embedded in expansion and control joints. The strips also enabled installation of plastic sheets to prevent moisture loss and provided protection against shotcrete overspray during construction of adjacent elements.
High Rise by the High Line
Avalon West Chelsea, a multi-family residential development located in the prime Chelsea Arts District of Manhattan, New York, is a reinforced concrete flat-plate structure. The “L-shaped” building consists of a 31-story tower featuring 309 luxury apartments and a 14-story mid-rise housing 405 units. The tower portion of Avalon West Chelsea was constructed using the 2-day cycle, a concrete construction method in which one level of superstructure is constructed every 2 days. The biggest challenge of this cycle was not the speed of the work itself, but the fact that multiple trades were mobilize and performed their tasks within the same physical space. About 150 union workers were employed every day.
Products & Practice Spotlight: Vertical Casting System for Poles and Piles
An innovative technology for the rapid production of hollow concrete poles and piles up to 14 m (46 ft) long was developed by Australian company Vertech Hume. The manufacturing process comprises pumping concrete into the base of an elongated vertical mold, compressing the mixture to force out free water, removing the freshly cast pole from the form, and steam curing it. A dual mold pole manufacturing plant requires only 120 m2 (1300 ft2) of land, contains few moving parts, and requires only four people to operate at its normal capacity. The pole manufacturing process and its advantages are described.
Congratulations, 2015 Long-Time Members of ACI
It is our pleasure to congratulate individuals in 2015 who will have supported ACI for 25 and 45 years.
ACI Board Committee Members Thanked
The following American Concrete Institute members have
ended terms on Standing Board Committees as of The
Concrete Convention and Exposition – Spring 2015.
Knowledge to Practice: ACI Foundation
NPCA Creative Use of Precast Awards 2015
The National Precast Concrete Association (NPCA)
Creative Use of Precast (CUP) Awards, sponsored by
Tricon Precast Ltd., recognize those projects promoting
the innovative and cost-saving advantages of precast concrete.
Making Conference Calls More Efficient
No one wants to sit on a boring conference call,
especially when they have other work to do. But
that’s the reality for a lot of people, at least according
to recent InterCall research on the rise of mobile conference
calls and employee conferencing behavior.
Concrete Q&A: Durability Table Requirements and Shotcrete Core Grades
Q. I’m designing a project that will have reinforced
concrete members that will be exposed to cycles of
freezing and thawing as well as sulfates. How do
the durability requirements in the ACI 318-141 Code compare
to those in ACI 318-112?
Q. What is the diameter of core samples required for
evaluation of shotcrete core grades? I couldn’t
find that information in ACI 506.2-95.1 Does ACI
have an updated version of the document that I should use?