Chloride Ions Penetration Resistance of New-Old Concrete

He, Zhi Min; Liu, Jun Zhe

doi:10.4028/www.scientific.net/amr.366.518

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…Zong researched the utilization of compound admixtures in the construction of frozen mine shaft lining concrete, providing data for optimizing the mix proportion of concrete admixture content [ 7 ]. He et al employed ASTM C1202 to investigate the effects of mineral admixtures on the resistance of chloride ions penetration in the new concrete compound system [ 8 ]. Li et al employed ring-test methods to study the early-age cracking characteristics of compound mineral admixture concrete, incorporating steel slag, blast furnace slag, and fly ash [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of High-Performance Concrete Materials in Civil Construction

Han,

Zhou

2023

Materials

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This paper develops the mechanical and durable samples of C50 high-performance concrete, studies the mechanical properties, crack resistance, sulfate attack resistance, frost resistance, and impermeability of concrete with different mineral admixtures of mineral powder and fly ash, and obtains the best mineral admixture of mineral powder and fly ash to improve the performance of high-performance concrete. The results show that the doping effect is the best when the ratio of prepared mineral powder to fly ash is 3:2. With the increase in the mineral powder–fly ash admixture, the slump and expansion of high-performance concrete decrease rapidly at first and then slowly. In total, 60% doping is the turning point; the compressive and flexural strengths of concrete decreased slowly at first and then rapidly. Taking 30% of the admixture as the turning point, 35% of the mineral powder fly ash is generally selected. By mixing and adding a certain proportion of fly ash and mineral powder admixtures, the crack resistance of concrete is enhanced, and the shrinkage and cracking are reduced. The corrosion resistance coefficient will exceed 88%, the relative dynamic elastic modulus will exceed 95%, and the impermeability grade will reach P17. The durability of concrete can be improved by adding mineral admixtures.

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of High-Performance Concrete Materials in Civil Construction

Han,

Zhou

2023

Materials

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“…Another important issue in wet connection joints is interface treatment. Many studies had found that the interface treatment has a significant impact on the mechanical properties of the interface, such as bonding, 11,12 shearing 13 and bending, 14 as well as durability properties such as permeability and chloride ingress resistance 15–17 . According to the mesoscopic composition, the concrete can be regarded as a two‐phase combination of aggregate and mortar 18 .…”

Section: Introductionmentioning

confidence: 99%

“…Many studies had found that the interface treatment has a significant impact on the mechanical properties of the interface, such as bonding, 11,12 shearing 13 and bending, 14 as well as durability properties such as permeability and chloride ingress resistance. [15][16][17] According to the mesoscopic composition, the concrete can be regarded as a two-phase combination of aggregate and mortar. 18 The mechanical properties and durability of concrete largely depend on the characteristics of its constituent phases, such as aggregate particle size, aggregate volume fraction, mortar properties, and initial defects.…”

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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 Ions Penetration Resistance of New-Old Concrete

Cited by 2 publications

References 4 publications

Performance Analysis of High-Performance Concrete Materials in Civil Construction

Performance Analysis of High-Performance Concrete Materials in Civil Construction

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

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