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Pro 84 vol2

SELF-HEALING CHARACTERISTICS OF PRESTRESSED SMALL BEAMS IN THIRD-POINT LOADING



Author(s): M. R. Hansen (1), Austin Norberg (2), Harvey Fitzgerald (3), Joseph Bender (4),
Zachery Hartung (5), Austin Hoellein(6), Brandon Soulek (7), Shane Herrod (8)
Paper category: Proceedings
Book title: Seventh International Conference on Concrete under Severe Conditions –
Environment and Loading, 23-25 September 2013, Nanjing, China
Editor(s): Z.J. Li, W. Sun, C.W. Miao
K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7; e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 66-73
Total Pages: 8
Language : English


Abstract: Concrete exhibits certain self-healing characteristics, which allows it to regain strength
after cracking due to the continued hydration of cement particles. This study investigates the
self-healing properties of rectangular prestressed 4” x 8” x 32” concrete beams subjected to
third point flexural loading as defined by ASTM C 78. The beams were made with a general
Type I/II cement with a water-cement ratio of 0.44. Three of the test specimens were allowed
to cure for 28 days and then were loaded such that they exhibited no cracks greater than .5
mm and then were allowed to heal for an additional 28 days in a moisture controlled
environment. The specimens were retested in third point loading to establish the percent of the
original beam strength regained by healing. Three additional “control beams” were also tested
to gauge the strength regained by the healing as a percent of the control beam strength.
Previous studies conducted at the South Dakota School of Mines and Technology have
examined the self-healing properties of rectangular reinforced 4” x 8” x 32” concrete beams.
Results from these studies suggest that nearly 100% strength is regained with reinforced
concrete beams and that there may be similar strengths regained for prestressed flexural beam
specimens.


Online publication : 2013
Publication type : full_text
Public price (Euros) : 0.00