Experimental research on physical and mechanical performance of steel rebars in Chinese modern reinforced concrete buildings built during the Republic of China era from 1912 to 1949

Chun, Qing; Balen, Koen Van; Pan, Jianwu

doi:10.1617/s11527-015-0748-6

Cited by 7 publications

(4 citation statements)

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“…Therefore, considering the contained long-term studies and the massive data, the China standard GB/T 51,355 for the durability assessment for the concrete structure can be taken as a basis for predicting the square rebar RC component durability especially for those equations which are not related to the rebar type. Regarding durability analysis, the key differences between current and historical RC components are concrete carbonization resistant ability and steel rebar type [22,26]. The ability of carbonization resistance of concrete is related to the overall quality of the concrete and the working condition, which can determine the time before rebar corrosion.…”

Section: Methodsmentioning

confidence: 99%

“…The book stated that the various section types of steel rebars in the early reinforcement industry were searching for the higher bond-slip strength between concrete and rebars, but it does not provide bond-slip strength between concretes and different types of rebars. Chun, Van Balen and Pan [26] tested material properties of square rebars on the abandoned members from the historical RC buildings (built between 1912 and 1949) in China. They reported that the square rebars were low-carbon and hot-rolled steel rebars, similar to the current round steel rebars, with an average yield strength of 278.60 MPa, and average tensile stress of 375.86 MPa.…”

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A Durability Prediction Method for Historical Square Rebar Reinforced Concrete Buildings

et al. 2021

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Square rebars were developed and used for decades in the early development of reinforced concrete (RC) structures; however, the objectives of modern concrete structure durability analyses and standards are centered on round rebars in past decades, which are not suited for RC buildings utilizing square rebars. Considering the absence of proper evaluation techniques to evaluate the square rebar RC structures’ durability accurately, a novel durability prediction method has been proposed for this type of historical building. The method is based on major parts as in-situ investigation, finite element model simulation, component importance analysis, and structural durability prediction. The durability prediction calculation method was established on the experimental results of the realistic historical concrete tests and corrosion-induced cover cracking experiments for square rebar components. It was found that the carbonization-resistant ability of historical concretes was relatively weaker than that of current concretes and the calculation method for critical corrosion depth of square rebar was different from that of round rebar. Furthermore, two typical application cases are presented to introduce the procedure of the method in detail. Consequently, the research outcomes can be directly used on the durability prediction and protection works for historical RC buildings.

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Section: Methodsmentioning

confidence: 99%

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A Durability Prediction Method for Historical Square Rebar Reinforced Concrete Buildings

et al. 2021

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“…Thirty-six square-rebar specimens for getting the material property were tested according to the standard 15 and the mechanical behavior of the ROC squarerebars is shown in Table 1. 16 The concrete was made according to the ROC literature (SMC [Shanghai Municipal Council] [17][18][19] ). The ROC reinforced concrete has the following characteristics: During the ROC, the cement market was basically monopolized by domestic manufacturers.…”

Section: Characterization Of Experimental Materials Propertiesmentioning

confidence: 99%

Experimental and numerical research on the bond‐slip behavior of square‐rebar reinforced concrete during the republic of China (1912–1949)

Zhang

Chun

Jin

et al. 2020

Structural Concrete

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Square-rebar reinforced concrete structures during the republic of China (ROC) have special material properties and structural characteristics. To perform nonlinear finite element simulations of this special type of structure more accurately, a specialized bond-slip constitutive model is built.Eighteen central pullout specimens were designed based on the ROC concrete mix proportions and the square-rebar. Then, the test data were fitted with the universal global optimization method and the minimum Euclidean distance point method was chosen to calculate the inflection point matrix of the bondslip constitutive model. Finally, the main factors influencing the bond-slip behavior of the ROC square-rebar reinforced concrete were analyzed. The research results show that the corrosion of the square-rebar produces a negative effect on the whole structure and a modified bond-slip regression curve considering the size effect is obtained. The research results can provide a scientific basis for the nonlinear calculation of ROC square-rebar reinforced concrete structures considering the bond-slip behaviors. Highlights• The universal global optimization method of bond-slip was used to fit the test data.• The minimum Euclidean distance point method and the minimum Mahalanobis distance point method were used to centralize the fitting inflection points.• A modified four-line bond-slip constitutive model considering the size effect was proposed for square-rebar reinforced concrete during the republic of China (1912China ( -1949.• Bond-slip behavior between concrete and rebar was modeled by finite element method.Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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“…The calculation models were a modification of existed calculation models for round-section rebars, while the use of square-section rebars was not token account especially. Chun et al [7] tested 66 rebars including 36 square-section rebars 30 round-section rebars from several Chinese modern RC structures built from 1912 to 1949 and presented the geometries, the physical and mechanical performance, the chemical composition and the metallographic of those rebars. Dong et al [8] carried out an electrochemical accelerated corrosion for square-section rebars from the RC structures built in the Republic of China era with 8 specimens.…”

Section: Introductionmentioning

confidence: 99%

Calculation method for the service life of Chinese historical reinforced concrete buildings

Jin

Chun

2020

MATEC Web Conf.

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Almost all of the existed studies on the corrosion of rebars were based on round-section rebars. However, the square-section steel rebars were widely used in China from 1912 to 1949, and there was no specific calculation model or durability assessment method for this type of historical buildings. In this study, based on the original configuration design of this kind of structures, the experiments of the corrosion-induced cover cracking of a certain number of reinforced concrete members with square-section rebars were carried out with the electrochemical acceleration method. The average rust depths of the square-section rebars at the critical corrosion-induced cover cracking moment were obtained. Then, the calculation method of critical rust depth of steel rebars at the concrete cover cracking moment was presented with data fitting method. Finally, combining with predication of carbonization life of concrete, a calculation method of the service life for Chinese historical RC buildings using square-section rebars was proposed. The research results can provide the basis for the durability assessment and conservation for Chinese historical RC buildings.

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Experimental research on physical and mechanical performance of steel rebars in Chinese modern reinforced concrete buildings built during the Republic of China era from 1912 to 1949

Cited by 7 publications

References 4 publications

A Durability Prediction Method for Historical Square Rebar Reinforced Concrete Buildings

A Durability Prediction Method for Historical Square Rebar Reinforced Concrete Buildings

Experimental and numerical research on the bond‐slip behavior of square‐rebar reinforced concrete during the republic of China (1912–1949)

Calculation method for the service life of Chinese historical reinforced concrete buildings

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