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- Title
车桥耦合振动对混凝土早期性能的影响及其损伤机理.
- Authors
蒋正武; 任强; 袁政成
- Abstract
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 vehicle-bridge coupled vibration on concrete 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 to 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. 0 MPa) of hardening , the negative interference of vehicle-bridge coupled vibration is insignificant, however, vehicle-bridge coupled vibration can lead to a lot of irreversible micro-cracks in concrete at the middle age (i. e. penetration resistance 0.5-28.0 MPa) , which may have a great influence on concrete performance.
- Publication
Jianzhu Cailiao Xuebao: Journal of Building Materials, 2015, Vol 18, Issue 3, p471
- ISSN
1007-9629
- Publication type
Article
- DOI
10.3969/j.issn.1007-9629.2015.03.019