Erosion damage and expansion evolution of interfacial transition zone in concrete under dry-wet cycles and sulfate erosion

Zheng, Suining; Qi, Lin; He, Rui; Wu, Jiangtao; Wang, Zhenjun

doi:10.1016/j.conbuildmat.2021.124954

Cited by 30 publications

(8 citation statements)

References 35 publications

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“…The sulfate salt corrosion to the metakaolin concrete mainly produces ettringite, gypsum, and mirabilite crystal (Hu and He, 2020) corrosion to the concrete, the tricalcium aluminate and Ca(OH) 2 react with SO 4 2− and produce excessive ettringite and gypsum, which can seriously damage the concrete performance. The reason why the metakaolin is conductive in improving concrete's resistance to sulfate salt (Zheng et al, 2021) can be concluded into two points: first, the replacement of part of cement by metakaolin reduces the tricalcium aluminate content in the cement accordingly, thereby reducing the generated volume of corrosion products; second, due to the high pozzolanic activity, the metakaolin could react with Ca(OH) 2 inside the concrete, and produce massive C-S-H and C-A-S-H, which narrow the pores inside the concrete and enhance the compactness of the concrete.…”

Section: Discussion Impacts Of Single So 4 2− On Metakaolin Concretementioning

confidence: 99%

Study on Metakaolin Impact on Concrete Performance of Resisting Complex Ions Corrosion

2021

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The main purpose of this study is to determine the metakaolin (MK) impacts on the concrete durability when the concrete is subjected to joint corrosion of SO42−,Mg2+ and, Cl−. Four groups of concrete test samples, which contained different MK contents, were designed and tested in order to see their physical property changes and macro-morphology differences during the cyclic corrosion process. And a series of approaches, including XRD, FTIR, SEM, and EDS, were applied to study the concrete phase composition changes and the micro-morphology features of all groups. According to the test results, when reaching 20 cycles, the concrete sample with 10% MK showed the best concrete physical properties; when reaching 120 cycles, the concrete with 5% MK content showed the best durability, produced similar amount of corrosion products to ordinary concrete, and presented relatively compacted micro-structure and small internal porosity. Mg2+ actually has a great impact on metakaolin. The corrosion product quantity increased significantly when MK admixture reached 15%. Due to the great number of produced M-S-H, the corrosive ions damaged the concrete for a second time, leading to serious aggregate peeling-off, powder surface of test samples, and porous micro-structure.

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Section: Discussion Impacts Of Single So 4 2− On Metakaolin Concretementioning

confidence: 99%

Study on Metakaolin Impact on Concrete Performance of Resisting Complex Ions Corrosion

2021

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“…When the foundation treatment is carried out in saline soil areas, the pile is under the comprehensive effect of long-term immersion, the dry-wet cycle, and the freeze-thaw cycle, plus the erosion effect of salt on concrete, which makes the bearing performance of composite foundations change during the operation period [32]. In the corrosive soil environment, whether it is a cast-in-place pile or a prefabricated pile, during the construction and operation, the concrete of the pile body may crack due to improper construction or erosion, thus reducing the service performance of the pile [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Long-Term Bearing Capacity of Concrete Pile Composite Foundation under Composite Salt Erosion

Wang,

Yang,

Zhang

et al. 2024

Buildings

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In order to study the long-term bearing capacity of concrete pile composite foundation in the Salt Lake area, based on the Tehran Isfahan high-speed railway project in Iran, the full (semi) immersion drying test and rapid freeze-thaw test was carried out, and the specimens were scanned by electron microscope. Numerical calculations were used to study the effects of different pile strengths and design parameters on the long-term bearing capacity of the composite foundation. The main conclusions were as follows: The concrete specimens in the adsorption zone deteriorated earlier and faster. In the rapid freeze-thaw tests, the strength attenuation of high-strength (C40, C50) specimens was smaller than that of low-strength specimens (C20). Within 20 years after construction, the additional settlement of low-strength (C20) piles was 12.21 mm, while high-strength concrete was less affected by deterioration. With pile spacing ranging from 1.8 m to 4.5 m, the maximum increase in additional settlement under the C20 condition was about 20 mm. The pile-soil stress ratio under the three conditions increased by 2.42, 6.59, and 8.63. As the pile length and diameter increased, the peak stress of the pile body moved towards the pile end, and the changes in the pile-soil stress ratio under the three conditions were similar.

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“…The mechanical properties of recycled aggregate self-compacting concrete do not significantly alter when the percentage of recycled aggregate does not exceed 50% [8][9][10][11]. Numerous studies have demonstrated that with the right replacement ratio, recycled coarse aggregate self-compacting concrete (RCASCC) can perform better than standard self-compacting concrete in terms of workability and fundamental mechanical properties [12][13][14][15][16]. Thus, it is possible to use RCASCC.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, it serves as a reference for the creation of self-compacting concrete requirements [20]. By integrating experimental approaches and theoretical analysis, the damage process and degradation mechanism of self-compacting concrete with RCA during a dry-wet cycle and linked sulfate erosion are explored [14].…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanical Properties and Erosion Resistance of Self-Compacting Concrete with Different Replacement Rates of Recycled Coarse Aggregates under Dry and Wet Cycles

Liu,

Han,

Zheng

et al. 2023

Applied Sciences

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Concrete that self-compacts is frequently utilized in engineering construction. Recycled coarse aggregate self-compacting concrete (RCASCC) is made by partially substituting recycled coarse aggregates (RCA) for natural coarse aggregates in order to conserve construction resources. This study examines the impact of linked sulfate erosion, dry and wet cycles, and RCA replacement rates of 0%, 25%, 50%, 75%, and 100% on the mechanical properties and durability of RCASCC. By using the mass loss rate, relative dynamic elastic modulus, corrosion resistance factor, X-ray diffraction (XRD), scanning electron microscope (SEM), and atomic force microscope (AFM) analyses, as well as other macroscopic and microscopic methods, it is possible to examine the deterioration patterns of RCASCC under dry and wet cycles. The results demonstrate that the addition of RCA has a notable impact on concrete’s resistance to sulfate attack during both dry and wet cycles. The erosion products steadily rise, the interfacial transition zone (ITZ) becomes rougher, and the sulfate resistance falls as the replacement rate of RCA rises. According to the findings of SiO2, AFt, and CaCO3, the examination of corrosion products from XRD and microstructure from SEM and EDS is carried out. The old mortar that has adhered to the surface of RCA, as shown by the AFM analysis of ITZ and the SEM analysis of RCA, can significantly affect the roughness of ITZ inside RCASCC.

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Erosion damage and expansion evolution of interfacial transition zone in concrete under dry-wet cycles and sulfate erosion

Cited by 30 publications

References 35 publications

Study on Metakaolin Impact on Concrete Performance of Resisting Complex Ions Corrosion

Study on Metakaolin Impact on Concrete Performance of Resisting Complex Ions Corrosion

Long-Term Bearing Capacity of Concrete Pile Composite Foundation under Composite Salt Erosion

Study on Mechanical Properties and Erosion Resistance of Self-Compacting Concrete with Different Replacement Rates of Recycled Coarse Aggregates under Dry and Wet Cycles

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