BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Empirical modelling the cracking strength of concrete: A unified a
 pproach - Professor Evan Bentz\, University of Toronto
DTSTART:20190705T144500Z
DTEND:20190705T153000Z
UID:TALK127240@talks.cam.ac.uk
CONTACT:Karen Mitchell
DESCRIPTION:A source of confusion in design codes is that multiple equatio
 ns are often provided for concrete tensile strength\, for example one for 
 modulus of rupture and another for direct tension strength. This paper pro
 poses that these differences in tensile strength result from a size effect
  that is based on the volume of concrete in tension.  Volumes larger than 
 about 30 litres (1 ft3) do not show this size effect and crack at the stre
 ss recommended by ACI for diagonal web-shear cracking. \nFor smaller volum
 es the tensile stress at cracking can be up to three or more times larger 
 than this value. When the volume of the specimen is accounted for by the p
 resented empirical size effect equation\, the different test methods show 
 consistent results. Using a set of 511 tension tests on plain or reinforce
 d specimens of different types and sizes\, the proposed unified tension mo
 del is justified.  Finally a simple design equation for flexural cracking 
 will be presented.\n\nBiography: Evan C. Bentz\, is Professor and Associat
 e Chair (undergrad) of Civil Engineering at the University of Toronto\, Ca
 nada.  He received his BASc from the University of Waterloo\, Canada\, in 
 1994 and his PhD from the University of Toronto in 2000.  He is a member o
 f ACI Committee 365 service life modelling\, and 445\, Shear and Torsion. 
 He received the\n2007-8 Henry Adams Award\, the ACI Chester Paul Seiss Awa
 rd in 2018 as well as the ACI Design Award twice.\n\n
LOCATION: Cambridge University Engineering Department\, LR3A
END:VEVENT
END:VCALENDAR