Chloride Ion Transport in Bridge Deck Concrete under Different Curing Durations

Ghanem, Hassan; Phelan, Scott; Senadheera, Sanjaya; Pruski, Kevin R

doi:10.1061/(asce)1084-0702(2008)13:3(218)

Cited by 13 publications

(3 citation statements)

References 24 publications

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“…The load level is most significant The critical chloride content (Ccrit) is generally considered as 0.4% by the weight of cement (% cem wt) in Europe and North America [52], although other values, e.g., 0.2% cem wt and 0.6% cem wt are also considered [53]. Herein, 0.4% cem wt is used as the key values of the steel [54,55]. Clearly, no depassivation of the steel is expected, even under a large deflection level, when subjected to FCTs under 1% de-ice salt solution.…”

Section: Discussionmentioning

confidence: 99%

Behavior of Engineered Cementitious Composites (ECCs) Subjected to Coupled Sustained Flexural Load and Salt Frost

Zhang²,

Sun

et al. 2022

Materials

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The performance of engineered cementitious composites (ECCs) under coupled salt freezing and loaded conditions is important for its application on the transportation infrastructure. However, in most of the studies, the specimens were generally loaded prior to the freezing. The influence of sustained load was merely considered. To this end, four sustained deflection levels, i.e., 0%, 10%, 30% and 50% of the deflection at the ultimate flexural strength, and three salt concentrations (1%, 3% and 5%) were applied. Prior to the salt frost resistance test, the fluid absorption of ECC specimens under various conditions were measured. The changes in relative dynamic elastic modulus (RDEM) during the freeze–thaw cycles were captured. The depth and the content profile of free chloride were measured after the coupled sustained load and freezing and thawing cycles. It is shown that 3% NaCl solution leads to the largest deterioration in all cases. There is no visible flaking or damage occurring on the surface. The relationships between locally sustained flexural stress and RDEM loss and also locally sustained flexural stress and free chloride penetration depth were proposed and showed satisfactory results. It is concluded that when ECC is subjected to the FTCs under 1% de-ice salt solution, no depassivation of the steel is expected even under a large deflection level. In terms of 3% and 5% salt solution, the thickness of cover should be no less than 20 mm when a deflection level of 0.5 is applied.

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Section: Discussionmentioning

confidence: 99%

Behavior of Engineered Cementitious Composites (ECCs) Subjected to Coupled Sustained Flexural Load and Salt Frost

Zhang²,

Sun

et al. 2022

Materials

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“…Silica fume can reduce the segregation and bleeding of concrete mixture and effectively reduce the permeability under proper curing. However, compared with concrete without silica fume, concrete containing silica fume needs a larger water cement ratio to ensure the same slump [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Effect of Curing Time on the Surface Permeability of Concrete with a Large Amount of Mineral Admixtures

Liu

Zhang

2022

Advances in Civil Engineering

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In order to explore the influence of curing time on the surface permeability of concrete, 10 groups of high content fly ash and slag concrete with two kinds of water-binder ratio were designed. There were cured under five curing methods, respectively. The influence of curing time on the surface permeability of concrete was studied. The mechanism was explained by hydration heat and mercury intrusion porosimetry. The results show that inadequate curing time leads to insufficient hydration of cementitious materials in concrete with large amount of mineral admixtures and significant increase in the diffusion of chloride ions on the surface of concrete. Standard curing for 14 days can basically ensure the chloride ion penetration resistance of concrete with large amount of mineral admixture. When the standard curing time is less than 7 days, the chloride ion penetration resistance deteriorates seriously. Under the condition of insufficient standard curing time, adding a small amount of limestone powder can effectively enhance the chloride ion permeability of concrete with a large amount of fly ash and slag.

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“…Because concrete is a porous material, the rate of chloride penetration is closely related to the state of the pores, which is influenced by the mix proportions (Shi, 2004), curing time (Ghanem et al, 2008;Hillier et al, 2000), saturation, supplementary cementing materials (Papadakis, 2000;Leng et al, 2000), etc. Moreover, Jau and Tsay (1998) indicated that the pore volume decreased as the concrete age increased, which means that the chloride diffusion coefficient of concrete gradually decreased with time.…”

Section: Introductionmentioning

confidence: 99%

Salt Spray Testing on the Chloride Resistance of Jointed Concrete

Tian

Ren

2018

Journal of Asian Architecture and Building Engineering

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Joints existing in segmental precast and pouring constructions have poorer performance than the monolithic parts in concrete structures, of which the mechanical behaviors have been studied by many researchers. However, studies related to the durability of concrete rarely focus on joints. The purpose of this study is to compare the chloride resistances between joints and the monolithic parts. Concrete structures are generally under a certain stress state, so unstressed specimens and specimens under compressive and tensile stresses were prepared. Salt spray tests on specimens with different stress states and different joint types were conducted. Based on the test results of chloride profiles, the chloride resistances of the specimens under different stress states were compared. The results indicate that the monolithic part has a better chloride resistance than the joint, no matter what the stress state is. Moreover, the chloride resistances of the different joints also differ greatly.

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Chloride Ion Transport in Bridge Deck Concrete under Different Curing Durations

Cited by 13 publications

References 24 publications

Behavior of Engineered Cementitious Composites (ECCs) Subjected to Coupled Sustained Flexural Load and Salt Frost

Behavior of Engineered Cementitious Composites (ECCs) Subjected to Coupled Sustained Flexural Load and Salt Frost

Effect of Curing Time on the Surface Permeability of Concrete with a Large Amount of Mineral Admixtures

Salt Spray Testing on the Chloride Resistance of Jointed Concrete

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