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Journal of Central South University

, Volume 18, Issue 3, pp 932–939 | Cite as

Flexural response of reinforced concrete beams strengthened with post-poured ultra high toughness cementitious composites layer

  • Nan Wang (王楠)
  • Shi-lang Xu (徐世烺)Email author
Article

Abstract

Four-point bending tests were conducted up to failure on eleven reinforced concrete (RC) beams and strengthening beams to study the effectiveness of externally pouring ultra high toughness cementitious composites (UHTCC) on improving the flexural behavior of existing RC beams. The strengthening materials included UHTCC and high strength grade concrete. The parameters, such as thickness and length of strengthening layer and reinforcement in post-poured layer, were analyzed. The flexural behavior, failure mode and crack propagation of composite beams were investigated. The test results show that the strengthening layer improves the cracking and ultimate load by increasing the cross section area. Introducing UHTCC material into strengthening not only improves the bearing capacity of the original specimens, but also disperses larger cracks in upper concrete into multiple tightly-spaced fine cracks, thus prolonging the appearance of harm surface cracks and increasing the durability of existing structures. Compared with post-poured concrete, UHTCC is more suitable for working together with reinforcement. The load-deflection plots obtained from three-dimensional finite-element model (FEM) analyses are compared with those obtained from the experimental results, and show close correlation.

Key words

ultra high toughness cementitious composities strengthening beams flexural behavior post-poured layer 

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Copyright information

© Central South University Press and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  1. 1.State Key Laboratory of Coastal and Offshore EngineeringDalian University of TechnologyDalianChina
  2. 2.Dalian Institute of Building Scientific Research & Design Stock Co., Ltd.DalianChina

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