Real-time Detection and Analysis of Damage in High-performance Concrete under Cyclic Bending |
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Authors: | L-P Guo W Sun A Carpinteri B Chen X-Y He |
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Institution: | (1) College of Materials Science & Engineering, Southeast University, Nanjing, 211189, P.R. China;(2) Jiangsu Key Laboratory of Construction Materials, Nanjing, 211189, P.R. China;(3) Department of Civil Engineering, University of Parma, Parma, 43100, ITALY;(4) College of Civil Engineering, Southeast University, Nanjing, 210096, P.R. China |
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Abstract: | In order to quantitatively evaluate the damage level in high-performance concrete (HPC) with pozzolanic minerals under constant
amplitude cyclic loads, three methods for real-time damage detection are employed in the present work, i.e., dynamic modulus
instrument, real-time strain collector, and digital speckle correlative method (DSCM). Six mechanical parameters at different
numbers of loading cycles are real-time captured by these three methods. For a maximum applied fatigue stress equal to 70%
of the static flexural strength, a cohesive crack is detected on the specimen surface by the DSCM system from 10% of concrete
fatigue life. The nucleation and propagation of the cohesive crack is reflected by the change of the strain concentration
zone in 2-dimensional strain fields. The experimental results show that the admixtures of Class F Fly Ash (FA) and S95 Ground
Granulated Blast-furnace Slag (GGBS) in high proportions increase the strain and cohesive-crack opening displacement as well
as remarkably improve the fatigue performance of HPC. |
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