Combined effect of water and sustained compressive loading on chloride penetration into concrete

Bao, Jiuwen; Wang, Licheng

doi:10.1016/j.conbuildmat.2017.09.018

Cited by 62 publications

(19 citation statements)

References 35 publications

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“…Previous studies [38,39,40] also reported a similar tendency of concrete with different w/b ratios in homogeneous magnetic fields due to different microstructural characteristics such as the surface/volume (S/V) ratio of the pores. Two basic aspects of concrete, drying shrinkage and moisture migration, initiate from the concrete surface; then, the internal concrete characteristics can be explained based on these aspects, which have been widely reported in the literature [22,41].…”

Section: Resultsmentioning

confidence: 99%

Influence of Moisture Content on Electromagnetic Response of Concrete Studied Using a Homemade Apparatus

Jin

Shao

et al. 2019

Sensors

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In this study, we examined the influence of moisture content on the electromagnetic response of concrete. A novel homemade electromagnetic monitoring apparatus was developed and used to evaluate the Hall effect voltage at both ends of concrete based on our previous study of the Hall effect. We used four different concrete mix water/binder ratios: 0.30, 0.28, 0.26, and 0.24, and three conditions (relative humidity, carbonation, and water absorption) were examined in this experiment. The results show that the moisture content inside concrete influences the relative permeability of concrete. The variation in the Hall effect voltage is more influenced by carbonation than changes in relative humidity; water absorption increases the Hall effect voltage the least amongst the other examined factors. According to the experiment, a calibration system was established, and the relevant correction factors are provided.

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Section: Resultsmentioning

confidence: 99%

Influence of Moisture Content on Electromagnetic Response of Concrete Studied Using a Homemade Apparatus

Jin

Shao

et al. 2019

Sensors

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“…Characteristic values of the critical chloride concentration C cr (%, relative to binder). The chloride ion diffusion coefficient of concrete decreases with exposure time, and is inversely proportional to corrosion time [36][37][38][39]. Further, the age factors of different types of concrete in different corrosion zones are shown in Table 6.…”

Section: Revised Service Life Prediction Model Suggested By Duracretementioning

confidence: 99%

Service Life Prediction of Reinforced Concrete in a Sea-Crossing Railway Bridge in Jiaozhou Bay: A Case Study

Jin

Zhao

et al. 2019

Applied Sciences

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Reinforced bar corrosion induced by chloride ingression is one of the most significant threats to the durability of concrete structures in marine environments. The concrete cover thickness, compressive strength, chloride diffusion coefficient, and surface defects of reinforced concrete in the Jiaozhou Bay sea-crossing railway bridge were measured. The temperature and relative humidity in the concrete and the loading applied onto the reinforced concrete were monitored. Based on the DuraCrete model, a revised model for the service life prediction of concrete structures was established, considering the effects of temperature and loading on the chloride diffusion coefficient. Further, the reliability indexes of the reinforced concrete box girder, pier, and platform, located in the marine and land sections, in relation to service lives lasting various numbers of years, were calculated. The measured and calculated results show that the mean cover thicknesses of concrete piers in the marine and land sections are 52 mm and 36 mm, respectively, and the corresponding standard deviations are 5.21 mm and 3.18 mm, respectively. The mean compressive strengths of concrete in the marine and land sections are 56 MPa and 46 MPa, respectively. The corresponding standard deviations are 2.45 MPa and 2.67 MPa, respectively. The reliability indexes of the reinforced concrete box girder and platform in the marine section, under the condition of a service life of 100 years, are 1.81 and 1.76, respectively. When the corrosion-resistant reinforced bar was used in the pier structure in the marine section, its reliability index increased to 2.01. Furthermore, the reliability index of the reinforced concrete damaged by salt fog in the land section was 1.71. Appl. Sci. 2019, 9, 3570 2 of 18 in particular, those exposed to marine environments, has been recognized as an effective means to ensure the service life of concrete structures, which has been a focus of researchers and engineers all over the world [11][12][13].Service life prediction modeling has become one of the current major issues in the design of concrete structures. Using the third-moment method, Zhang [14] developed a time-dependent probability assessment for chloride-induced corrosion of RC structures. In order to provide corrective parameters for service life prediction, Li [15] investigated the time-dependent chloride penetration into concrete in marine environments. Considering the effect of the materials' heterogeneity when exposed to a marine tidal zone, Wang [16] developed a service life prediction model. Attari and Mcnally [17] explored a probabilistic assessment of the influence of the age factor on the service life prediction using concrete with limestone cement/ground granulated blast slag (GGBS) binders. Yu [18,19] developed a service life prediction model considering freeze-thaw fatigue, taking into account fly ash and slag. Hackl and Kohler [20] developed a reliability assessment which uses the coupled effect of corrosion initiation and progression to represent th...

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“…Sun and Lu [33] demonstrated that the permeability of concrete increased under 60% ultimate load during coupling effect of axially distributed load and carbonization. Bao and Wang [34] found that with the increase of compression stress load, the chloride content decreased firstly and then increased after a critical stress level. Sun et al [35] found that the stress ratio was an important influencing factor on performance of concrete; concrete subjected to higher stress ratio, presented greater frost damage.…”

Section: Introductionmentioning

confidence: 99%

Water absorption and chloride diffusivity of concrete under the coupling effect of uniaxial compressive load and freeze–thaw cycles

Wang

Cao

Zhang

et al. 2019

Construction and Building Materials

165

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In cold coastal area, the destruction mechanism of reinforced concrete structures is mainly governed by a combination of factors such as self-loading, freeze-thaw and chloride erosion. In this study, ordinary cube concretes (C30 and C50, while w/c = 0.53 and 0.35 respectively) underwent a coupling effect of pressure load with stress ratio of 0, 0.3 and 0.5 and freeze-thaw cycles, following by capillary water absorption test and chloride penetration test. Concrete samples with 0.3fc showed the best water and chloride penetration resistance under the coupling effect, followed by samples with 0.5fc and 0fc, which is consistent with the conclusion that under load only. Water and chloride ions penetration increased sharply when freeze-thaw cycles was over 100 times, which is different with samples without load. Outside part of concrete showed higher permeability and chloride content than inside part. MIP results confirmed that stress played an important role in the water absorption and chloride penetration of concrete under the coupling effect. These results provide important new insights into the permeability of concrete under a coupling effect. The applied load performed a more important role on the service life prediction of concrete structure.

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Combined effect of water and sustained compressive loading on chloride penetration into concrete

Cited by 62 publications

References 35 publications

Influence of Moisture Content on Electromagnetic Response of Concrete Studied Using a Homemade Apparatus

Influence of Moisture Content on Electromagnetic Response of Concrete Studied Using a Homemade Apparatus

Service Life Prediction of Reinforced Concrete in a Sea-Crossing Railway Bridge in Jiaozhou Bay: A Case Study

Water absorption and chloride diffusivity of concrete under the coupling effect of uniaxial compressive load and freeze–thaw cycles

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