Ultrasonic testing and microscopic analysis on concrete under sulfate attack and cyclic environment

Jiang, Lei; Niu, Ditao; Sun, Y.; Fei, Qian-nan

doi:10.1007/s11771-014-2482-6

Cited by 27 publications

(10 citation statements)

References 9 publications

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“…Besides, the diffraction peak of gypsum appeared after 150 freeze-thaw cycles, which confirmed that the formation of ettringite was prior to that of gypsum. Similar findings [13,15,27] have been reported. Moreover, with the advance of freeze-thaw cycle, the diffraction peaks of calcium hydroxide decreased, which is in line with the actual situation that the pozzolanic reaction of FA and the increase of ettringite and gypsum gradually consumed calcium hydroxide.…”

Section: Damage Analysissupporting

confidence: 91%

“…Moreover, Figure 6 also shows that ettringite crystals were easily formed at the micropores, microcracks, and interface between slurry and aggregate, resulting in the decrease of cohesiveness of concrete. is was not in line with the literature [15]. Consequently, the expansion of voids and cracks caused by internal stress led to the brittleness and strength reduction of concrete.…”

Section: Damage Analysiscontrasting

confidence: 54%

“…It can be seen from the failure morphology that the damage of 20% fly ash concrete in 5% Na 2 SO 4 solution was the most serious after 200 freeze-thaw cycles, which basically fragmented into pierces subjected to compressive force. is is because the corrosion products are prone to form at the interface between cement paste and aggregate to weak their cohesiveness [12,15], which was observed by SEM ( Figure 6). In the initial freeze-thaw cycles, the crack expanded from top to bottom after compression failure due to strong bonding ability.…”

Section: Failure Morphological Characteristicsmentioning

confidence: 98%

“…Maes and De Belie [14] pointed out that the presence of the chloride ion can alleviate sulfate attack, and the permeability of the chloride ion increases with the increase of salt concentration. Jiang et al [15] examined the freeze-thaw cycle performance of 20% fly ash concrete exposed to 5% sodium sulfate solution and revealed the interaction between freeze-thaw cycle and sulfate attack. Sulfate corrosion speeds up the formation of microcracks in concrete and causes more serious damage during freezethaw cycles.…”

Section: Introductionmentioning

confidence: 99%

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Damage and Degradation of Concrete under Coupling Action of Freeze‐Thaw Cycle and Sulfate Attack

Tian

Gao

2020

Advances in Materials Science and Engineering

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In this study, the mechanical behaviors, failure characteristics, and microstructure of concrete containing fly ash (FA) against combined freeze-thaw cycles and sulfate attack were studied compared with normal concrete, and the formation rates of corrosion products during coupling cycles were investigated. Results showed that, during the coupling action of freeze-thaw cycles and sodium sulfate solution, concrete containing 10% fly ash exposed in 5% sodium sulfate solution exhibited better freeze-thaw resistance. Meanwhile, the variation of compressive strength of concrete during the coupling cycles could be divided into two stages, including the strength enhancement stage and the strength reduction stage. Moreover, the proportion of micropores and capillary pores decreased obviously during combined freeze-thaw cycles and sulfate attack, and excessive concentration of sodium sulfate solution led to more macropores after high-frequency freeze-thaw cycles.

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Section: Damage Analysissupporting

confidence: 91%

Section: Damage Analysiscontrasting

confidence: 54%

Section: Failure Morphological Characteristicsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Damage and Degradation of Concrete under Coupling Action of Freeze‐Thaw Cycle and Sulfate Attack

Tian

Gao

2020

Advances in Materials Science and Engineering

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“…Some examples of damage caused by sulfate attack have occurred in the coastal areas all over the world. At present, sulfate attack is mainly due to two factors: one is the groundwater environment and the other is the discharge of industrial wastewater [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Influence of Alternation of Sulfate Attack and Freeze-Thaw on Microstructure of Concrete

Yang

Shen

Rao

et al. 2015

Advances in Materials Science and Engineering

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The effects of sulfate attack and freeze-thaw alternation on the concrete microstructure were systemically investigated by advanced test methods such as water absorption method, air void analysis, XRD, and SEM. The experimental results indicated that freeze-thaw damage is the major effective factor in the sulfate attack and freeze-thaw alternation test. In the alternation test, average aperture of capillary pores of specimens was smaller, pores uniformity was better, and water absorption rate was lower than those specimens used in the single freeze-thaw damage test. The average aperture and uniformity of pores could be improved by adding fly ash and slag. Damage was accumulated in many cycles of freeze-thaw and microcracks increased during the test. At the same time, the hydration products of the concrete developed into expansive gypsum, AFt, and TSA without any strength during sulfate attack. The results of the microstructure analysis form XRD and SEM are in accordance with that of AFt, about 3 m length, around which other hydration products decomposed by C-S-H after sulfate attack resulted in loss of concrete strength.

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Experimental Study on Mechanical Properties of Seawater Sea-Sand Recycled Concrete Under Sulfate Attack

Tian

Huang

Jing-xue

et al. 2023

Lecture Notes in Civil Engineering

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The preparation of seawater sea-sand recycled concrete (SSRAC) by combining seawater, sea-sand and recycled coarse aggregate is of great significance for the utilization of marine resources and environmental protection in China. The sulfate corrosion test in this paper uses dry wet cycle to simulate the alternating dry wet environment, and compares the ordinary concrete (OC) and freshwater river sand recycled concrete (RAC) to study the mechanical property deterioration characteristics of SSRAC in dry–wet cycle (30d, 60d, 90d, 120d). The results show that with the increase of the dry–wet cycle, the apparent damage of SSRAC gradually extends from the diagonal to the periphery, and finally the cracks spread all over the whole. The mass, strength and strength corrosion resistance coefficient of SSRAC show the same law as OC and RAC, which increase first and then decrease. The resistance of SSRAC to sulfate attack is lower than OC and slightly higher than RAC, and the strength corrosion resistance coefficient is lower than 75% at 120 times of dry–wet cycle.

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Ultrasonic testing and microscopic analysis on concrete under sulfate attack and cyclic environment

Cited by 27 publications

References 9 publications

Damage and Degradation of Concrete under Coupling Action of Freeze‐Thaw Cycle and Sulfate Attack

Damage and Degradation of Concrete under Coupling Action of Freeze‐Thaw Cycle and Sulfate Attack

Influence of Alternation of Sulfate Attack and Freeze-Thaw on Microstructure of Concrete

Experimental Study on Mechanical Properties of Seawater Sea-Sand Recycled Concrete Under Sulfate Attack

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