Damage and its restraint of concrete with different strength grades under double damage factors

Sun, Wenbo; Zhang, Y.M; Yan, Huang; Mu, Ru; Yan, Ai

doi:10.1016/s0958-9465(99)00033-5

Cited by 26 publications

(10 citation statements)

References 1 publication

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“…This main hydration product is definitely beneficial for the crack resistance of concrete under cyclic loads. These positive effects of FA and GGBS on the microstructure and strength of matrix-aggregate ITZ are supported by the research findings reported in Refs [44,45].…”

Section: Discussionsupporting

confidence: 83%

“…Owing to the admixture of pozzolanic minerals in concrete, HPC exhibits better mechanical properties than those of normal concrete. Numerous structures all over the world are being constructed by using HPC or reinforced HPC with low proportions of pozzolanic minerals [9,10], and some of them are subjected to fatigue loading (such as railway baseplate, highway bridge, etc.) [11].…”

Section: Introductionmentioning

confidence: 99%

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Real-time Detection and Analysis of Damage in High-performance Concrete under Cyclic Bending

et al. 2009

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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, realtime 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 cohesivecrack opening displacement as well as remarkably improve the fatigue performance of HPC.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Real-time Detection and Analysis of Damage in High-performance Concrete under Cyclic Bending

et al. 2009

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“…Miao et al and Sun et al reported that the deterioration of concrete could be accelerated when subjected to dual damaging processes, e.g. simultaneously subjected to both external loading and freeze-thaw cycles Sun, Zhang, Yan, Mu, & Yan, 1999). Jacobsen et al investigated the effect of internal cracking on ice formation in high strength concrete (Jacobsen, Sellevold, & Matala, 1996).…”

Section: Introductionmentioning

confidence: 99%

Research on the performance of concrete materials under the condition of freeze-thaw cycles

Zhang

Zhao

2013

European Journal of Environmental and Civil Engineering

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Durability of concrete has been a social concern due to the poor performance of concrete caused by various environmental conditions. This paper aims to study the effects of damage caused by freeze-thaw cycles which often appeared in cold areas on the performance of concrete with polypropylene fibres, such as strength, carbonation depth and chloride ion diffusion. Concrete samples with different degrees of damage were produced by different freeze-thaw cycles. The concrete sample shows great water absorption after freeze-thaw cycles. Due to damage by freeze-thaw cycles, the total pore volume, porosity and average pore diameter of concrete samples damaged by freeze-thaw cycles were generally larger than that of normal concrete samples. Compressive strength and splitting strength of concrete exposed to freeze-thaw cycles decreased with the number of freeze-thaw cycles and greater damage caused higher loss of strength, especially for the splitting tensile strength. The carbonation depth of the concrete after freeze-thaw cycles was also greater than that of the concrete before freeze-thaw cycles. Chloride ion diffusion rates were evaluated using the free chloride ion concentration titration method and the steady state migration testing method. Results indicated that freeze-thaw cycles could accelerate chloride ion diffusion rates. More severe concrete damage results in greater chloride diffusion.

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“…The independent design of physical load resistance and durability for service life of concrete structures has resisted the real performance state (Mehta, 1991;Sun et al, 1999). Practical civil concrete structures, such as bridges, highway pavements, and so on, are expected to resist millions of cycles of repeated loads during their service life.…”

Section: Introductionmentioning

confidence: 99%

Damage of concrete subjected to simultaneous fatigue load and thermal effect

Sun

Jiang

2012

Magazine of Concrete Research

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Physical loads and environmental actions have simultaneous effects on concrete in nature. An analytical method is proposed to detect the damage to concrete subjected to four-point flexure fatigue load and thermal hysteresis in freeze–thaw. The interaction of the two kinds of loads on the combined damage, in terms of a coefficient fD(T), is defined to characterise quantification. Damage is aggravated by the combined loads when fD(N)>1 as compared to isolated loading. The results show that increasing fD(N) is always seen in the freezing stage, since damage as a result of tensile stress only is being considered here. Moreover, a critical point above which the damage is aggravated by the combined loads is found by extrapolating the maximum values of fD(N) until fD(N)=1 at N = 380 000, that is close to the average life (N = 348 310) obtained from the experiments. This work provides a framework to explore the coupled effects on damage from physical loads and environmental actions.

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Damage and its restraint of concrete with different strength grades under double damage factors

Cited by 26 publications

References 1 publication

Real-time Detection and Analysis of Damage in High-performance Concrete under Cyclic Bending

Real-time Detection and Analysis of Damage in High-performance Concrete under Cyclic Bending

Research on the performance of concrete materials under the condition of freeze-thaw cycles

Damage of concrete subjected to simultaneous fatigue load and thermal effect

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