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Pro 84 vol2

STUDY ON DAMAGE MECHANISM OF CONCRETE BY VEHICLEBRIDGE COUPLED VIBRATION



Author(s): Z.W.Jiang, W.T.Li, K.F.Yang, X. Xiao
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: 74-83
Total Pages: 10
Language : English


Abstract: In this paper, the variation law of vehicle-bridge coupled vibration was analyzed and a
reasonable method to simulate coupled vibration in lab as well as the evaluation indexes was
proposed. Then the effects of vehicle-bridge coupled vibration parameters on the properties of
concrete with different water-cement ratio were studied. The damage mechanism of concrete
by vehicle-bridge coupled vibration was investigated according to the microstructure results.
The results indicate that under vehicle-bridge coupled vibration, the bleeding of concrete
accelerates, the actual water-cement ratio reduces, and the compressive strength increases a
certain extent. However, the early segregation of concrete is aggravated by the vibration,
which leads to worse uniformity and compactness. The long-term performance of concrete is
deteriorated as seen from a higher proportion of deleterious pores (>200nm)of concrete. At
the early age (i.e. penetration resistance≤0.5MPa ) of setting and later age (i.e. penetration
resistance≥28MPa) of hardening, the negative interference of vehicle-bridge coupled
vibration are insignificant, however, vehicle-bridge coupled vibration can lead to a lot of
irreversible microcracks in concrete, which may have a great influence on concrete
performance at the middle age (i.e. penetration resistance0.5MPa ~28MPa).


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