Influence of compressive stress on chloride transport in the interfacial zone of precast and cast‐in‐place concrete

Zhao, Jie; Luo, Xiaoya

doi:10.1002/suco.201900147

Cited by 9 publications

(3 citation statements)

References 33 publications

(31 reference statements)

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“…Based on the chloride ion measurement results, the interface zone effect (IZE) is mathematically described as a Gauss-Amp function. Zhao [8] et al analyzed the effect of constant compressive stress on the migration behavior of chloride ions in the interface region based on the definition of IZE. The results show that the chloride ion diffusion coefficient and the chloride ion concentration on the surface of the interface region are both related to distance and stress.…”

Section: Studies On Whether Stress Is Appliedmentioning

confidence: 99%

A Review of Durability of New and Old Concrete Joints

Long

2024

SJT

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The purpose of this study is to explore the durability of the new and old concrete joints, including chloride ion erosion, freeze-thaw phenomena, and the influence of aggregates. Firstly, taking into account the difference in material properties between the old and new concrete, this study analyzes the chloride ion transport characteristics of the joints in detail, focusing on the key areas of the joints, that is, the areas where the old concrete may have been eroded by chloride ions. Secondly, this study explores the change in the properties of the joints under freeze-thaw conditions, and the influence of different interface treatment methods on the properties of the joints. Finally, this study examines the influence of the type and content of aggregates on the durability of the joints. Through the above research, this paper aims to provide some useful guidance and suggestions for the durability design of the old and new concrete structures.

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Section: Studies On Whether Stress Is Appliedmentioning

confidence: 99%

A Review of Durability of New and Old Concrete Joints

Long

2024

SJT

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“…Precast concrete structures have two connection modes: dry connection and wet connection, of which the latter is dominant 4,5 . In wet connection system, there are many seams between new and old concrete as well as a large number of steel bars connection nodes, which make the wet joints become the weak parts in physical, mechanical and durability performance 6 . In the 1970s, Florida tried to promote the technology of full‐span composite slab bridges 7 .…”

Section: Introductionmentioning

confidence: 99%

“…and durability performance. 6 In the 1970s, Florida tried to promote the technology of full-span composite slab bridges. 7 However, in the first project, due to the combined effect of traffic load and the shrinkage difference between new and old concrete, there were obvious longitudinal peeling cracks at almost all the composite joints.…”

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confidence: 99%

Modeling coarse aggregate distribution in interfacial zone of new–old concrete in precast concrete structures

Zhao

Chen²

2022

Structural Concrete

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There are a large number of interfacial zones of new-old concrete in precast concrete structures, and the wall effect causes the reduction of coarse aggregate in the interfacial zones, which leads to the weaker physical, mechanical and durability properties of this part. In the present paper, some new-old concrete specimens with different chiseled depths at the interfaces were made to simulate the wet joints of precast concrete structures. The distribution characteristics of the coarse aggregate volume fraction in the interfacial zones of new-old concrete specimens were obtained by DIP (Digital Image Processing) technology. The results show that the distribution of the coarse aggregate volume fraction in the interfacial zones is similar to a positive V-shape (no chiseling) or partial V-shape (chiseled interface), and is generally lower than that of the noumenons of new and old concrete (constant values). With the increase of chiseled depth, the valley point (i.e., the minimum value) of the distribution curve of coarse aggregate volume fraction in the interfacial zone will move upwards and offset toward the old concrete. When the offset reaches 2 mm from the interface, it remains stable. The multiple irregular cone-shape small pits on the actual chiseled surface are abstracted into a single bulging slope pit, and the area ratio of new-old concrete on the cross section within the chiseled range is derived. On this basis, the model of the coarse aggregate volume fraction in the interfacial zone varied with the distance from the interface is proposed.coarse aggregate distribution, interfacial zone, new-old concrete, precast concrete structure | INTRODUCTIONCompared with cast-in-place concrete structures, precast concrete structures have significant advantages in terms of production technology and environmental impact, so they have been widely used all over the world for decades. 1,2 With the extensive promotion of precast concrete structures in China in recent years, its application will be further expanded in the future. 3 Precast concrete structures have two connection modes: dry connection and wet connection, of which the latter is dominant. 4,5 In wet connection system, there are many seams between new and old concrete as well as a large number of steel bars connection nodes, which make the wet joints become the weak parts in physical, mechanical 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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Chloride transport through the interface in repaired marine concrete systems in a cracked state

Zhou,

Lu,

et al. 2024

Structural Concrete

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In repaired marine concrete structures, generally, an interface exists between old and new concrete, however, the influence of this interface on durability has yet not been well understood. In this study 18 reinforced concrete beams with new‐to‐old concrete interfaces (N–O interfaces) were designed to investigate chloride transport through a cracked interface. The effects of crack widths at the interface, concrete strain, and the chloride exposure time were considered, respectively. Results showed that the N–O interfaces having crack widths between 0 and 0.13 mm posed no significant impact on the chloride transport in the depth direction of the N–O interfaces, however when the crack width exceeded 0.13 mm, the chloride concentration gradually increased as the crack width increased. Chloride transport through the horizontal direction of the N–O interface was different between new and old concrete matrix when the crack width reached 0.18–0.20 mm. The surface layer with a range of 5–10 mm depth of concrete was sensitive to the variation of concrete strain, and the evolution of chloride concentration with concrete strain presented a logarithm relationship. Within the exposure period between 60 and 90 days, the increasing rate of chloride concentration was higher than that between 30 and 60 days. The study can provide some recommendations for repair of concrete elements exposed to a chloride‐laden exposure environment.

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Influence of compressive stress on chloride transport in the interfacial zone of precast and cast‐in‐place concrete

Cited by 9 publications

References 33 publications

A Review of Durability of New and Old Concrete Joints

A Review of Durability of New and Old Concrete Joints

Modeling coarse aggregate distribution in interfacial zone of new–old concrete in precast concrete structures

Chloride transport through the interface in repaired marine concrete systems in a cracked state

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