Experimental investigation and analysis on flexural performance of functionally graded composite beam crack-controlled by ultrahigh toughness cementitious composites |
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Authors: | QingHua Li ShiLang Xu |
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Affiliation: | (1) State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China |
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Abstract: | Based on the concept of functionally graded concrete, UHTCC (ultrahigh toughness cementitious composites) material with excellent
crack-controlling ability is strategically substituted for part of the concrete, which surrounds the main longitudinal reinforcement
in a reinforced concrete member. Investigations on bending behavior of such a functionally graded composite beam crack-controlled
by UHTCC (abbreviated as UHTCC-FGC beam) have been carried out. After establishing a theoretical calculation model, the paper
discusses the results of four-point bending experiment on long composite beams without web reinforcement, and validates the
theoretical formulae through experimental results of UHTCC-FGC beams with different thicknesses of UHTCC layer. Besides improving
bearing capacity and saving steel reinforcements, the results indicate that UHTCC-FGC beams can also effectively control the
deformation and enhance the ductility of members. At last, the optimal thickness of UHTCC layer in UHTCC-FGC beams has been
confirmed, which can not only save materials and improve mechanical performance of members, but also be very effective in
preventing corrosion-induced damage and enhancing the durability of members by controlling crack width below 0.05 mm under
service conditions.
Supported by the Key Program of the National Natural Science Foundation of China (Grant No. 50438010) and the Research and
Application Programs of Key Technologies for Major Constructions in the South-North Water Transfer Project Construction in
China (Grant No. JGZXJJ2006-13) |
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Keywords: | UHTCC crack control functionally graded experimental research validation durability |
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