Study on damage mechanism of concrete by vehicle-bridge coupled vibration

Author(s): Z. W. Jiang, W. T. Li, K. F. Yang, X. Xiao
Paper category: Proceedings
Book title: Proceedings of the Seventh International Conference on Concrete under Severe Conditions – Environment and Loading
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 (> 200 nm) of concrete. At the early age (i.e. penetration resistance ≤ 0.5 MPa ) of setting and later age (i.e. penetration resistance ≥ 28 MPa) 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 resistance 0.5 MPa ~ 28 MPa).

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