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Slim Columns Made of Advanced Performance Composite Concrete with Compressive Strength of 200 Newtons per Square Millimeter

—Completion of installation on the (tentative name) Suita City Stadium—

November 14, 2014Takenaka Corporation

Takenaka Corporation (President: Masahiro Miyashita) has completed installation at (tentative name) Suita City Stadium of slim columns made using compressive strength 200 N/mm2 ※1 Advanced Performance Composite (APC®) concrete (referred to below just as Advanced Performance Concrete※2. Patented.) that Takenaka has developed.

The stadium was planned as a frame structure with inclined columns installed in part of the third-story concourse to organize the spectators’ seating. Using Advanced Performance Concrete with compressive strength of 200 N/mm2 to make the columns slimmer with a column cross section area of about one-fourth of the original area (external shape: 36cm square, structural cross section: 35cm square). This mitigates the pressure of the concourse on spectators as they pass through the space, and contributes to improving the design qualities.
In order to reduce the size of the columns, using steel columns was also considered, but the demerits of this approach would be increasing the complexity of connections with beams and requiring fireproof coverings.

Takenaka obtained production technology certification in order to manufacture the 200N/mm2 Advanced Performance Concrete in a precast plant jointly with Daiwa Corporation. A production system was established at the precast plant to permit high volume production, shorten the manufacturing period, and to apply it on a nationwide level.

※1 Compressive strength able to withstand a load of 2,000kgf per 1 cm2

※2 APC stands for Advanced Performance Composite

Overview of Advanced Performance Concrete Technology

  • Ensuring three-hour fireproof performance in a range up to 200N/mm2 On high-strength concrete, fire may cause the bursting phenomenon—separation and scattering of the surface—lowering bearing strength and scattering material damaging the surroundings. Thus, Advanced Performance Concrete technology that Takenaka has independently developed increased fireproof performance owing to the use of a hybrid type made by mixing in synthetic fibers such as polypropylene and steel fibers. Takenaka obtained an Architectural Technology Certificate concerning fireproof performance from the General Building Research Corporation of Japan (GBRC) ※3.
  • Ensuring strength and toughness as a structural member Generally, if compressive strength of concrete is increased, the strength of columns and similar members increases, but they characteristically become extremely brittle. Thus, mixing in steel fibers ensured toughness.
  • Establishing both superhigh-strength of 200N/mm2 and high fluidity To improve fluidity and strength, the composition of the material was reconsidered, and a silica fume premixed cement with a high content of ultrafine particle admixture silica fume was adopted. At the same time, jointly with a manufacturer, Takenaka developed and adopted a high-range water reducing agent with high dispersibility that can be mixed to achieve a water cement ratio of about 10 percent.
  • Establishment of production control technology and obtaining MILT Certification Takenaka obtained MLIT Certification for the method of designing a structure up to 200N/mm2 and member manufacturing methods, etc.
  • Awarded the 2011 Architectural Institute of Japan Prize (Technology) In recognition of past achievements, Takenaka was awarded the 2011 Architectural Institute of Japan Prize (Technology) (sponsored by the Architectural Institute of Japan)※4.

※3 For details, see  http://www.takenaka.co.jp/news/pr0903/m0903_01.html

※4 For details, see  http://www.takenaka.co.jp/news/2011/05/01/index.html

Recent years have seen the growth of two needs: for superhigh-rise buildings and for greater freedom of space. Takenaka believes that the Advanced Performance Concrete that it has developed to provide both good fireproof performance and structural strength and toughness is a method that will satisfy such needs at the same time as it expands the potential of RC structures. In the future, Takenaka plans to continue to expand the application of its lineup of concretes.

Overview of the project work

Project name (tentative name) Suita City Stadium
Building site In Senri Expo Park in Suita City
Use Stadium (Capacity for 40,000 spectators)
Work period December 1, 2013 to September 30, 2015 (Scheduled) Total work period of 22 months
Structure/Number of floors RC (conventional and PC ), Steel, 6 fl.
Building height 40.33m
Building area 24,712m2
Total floor space 66,355m2

Advanced Performance Concrete used

Cross section 360mm×360mm
Compressive strength 200N/mm2
Number of columns 10