Resistance of recycled aggregate concrete containing low- and high-volume fly ash against the combined action of freeze–thaw cycles and sulfate attack

Li, Yang; Wang, Ruijun; Li, Shouyi; Zhao, Yun; Qin, Yuan

doi:10.1016/j.conbuildmat.2018.01.084

Cited by 99 publications

(38 citation statements)

References 39 publications

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“…is indicates that a certain concentration of Na 2 SO 4 solution improved freeze-thaw resistance of concrete, but excessive fly ash content reduced this ability. erefore, it could be concluded that 10% fly ash and 5% Na 2 SO 4 seem to be the optimum dosage for improving the freeze-thaw resistance of concrete, which is consistent with the research result of Li et al [12], who pointed out that low content FA concrete has better antifreeze-thaw cycle performance in 5% Na 2 SO 4 solution. However, Wang et al [13] indicated that 10% Na 2 SO 4 more obviously improve freeze-thaw resistance of concrete with 25% FA.…”

Section: Resultssupporting

confidence: 88%

“…e densification process of concrete under the coupling action of freeze-thaw cycles and 5% sodium sulfate solution occurred in the first 100 freeze-thaw cycles. e result was consistent with Li et al's finding [12]. Besides, the decline rate of relative dynamic elastic modulus increased with increasing content of fly ash, resulting from high FA content which reduced the content of cement and decreased the basic excitant of Ca(OH) 2 in which fly ash hydration depends [29] and accelerated the effect of the coupling action of freeze-thaw cycle and sulfate attack on the deterioration of concrete [28].…”

Section: Relative Dynamic Elastic Modulus (Rdem)supporting

confidence: 91%

“…In addition, original voids on the specimen surface enlarged, and new cracks appeared. At the beginning of freeze-thaw cycles, 5% sodium sulfate solution reduced erosion deterioration of concrete specimens caused by freeze-thaw cycles [12]. And at the later stage of this cycle, the higher the content of fly ash, the more serious the damage of concrete specimens.…”

Section: Resultsmentioning

confidence: 94%

“…Numerous works of deterioration of macroscopic properties of concrete exposed to freeze-thaw cycles in salt solution have been reported. Li et al [12] studied the durability of recycled concrete with fly ash exposed to 5% sodium sulfate solution under freeze-thaw cycles. ey argued that the positive effect of sulfate attack on the freezethaw cycle is greater than the negative effect.…”

Section: Introductionmentioning

confidence: 99%

“…ough concrete suffered from sulfate attack, it drops the freezing point of the pore solution [21]. Adding fly ash into concrete could optimize the microstructure to a certain extent [22,23]; according to Yazıcı [24], FA has a positive effect on the mechanical properties, freeze-thaw properties, and chloride penetration resistance of concrete, whereas Li et al [12] argued that cement-based materials mixed with high-content FA produce adverse effects on compressive strength. In fact, it is not clear how much the dosage of fly ash and sodium sulfate solution is beneficial for improving deterioration resistance of concrete exposed to combined freeze-thaw cycles and sulfate attack.…”

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: Resultssupporting

confidence: 88%

Section: Relative Dynamic Elastic Modulus (Rdem)supporting

confidence: 91%

Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Effect of the dosage of MWCNT's on deterioration resistant of concrete subjected to combined freeze–thaw cycles and sulfate attack

Gao

Tian

Wang

et al. 2020

Structural Concrete

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In this study, the deterioration resistant of concrete with and without multi‐walled carbon nanotubes (MWCNTs) against combined freeze–thaw cycles and sulfate attack was studied, and concretes incorporating MWCNTs (i.e., 0.05, 0.10, and 0.15 wt%) as partial replacement of Portland cement were exposed to 5% sodium sulfate solution under freeze–thaw cycles. The performance, including compressive strength, relative dynamic elastic modulus, mass loss, microstructure, deterioration resistant coefficient of concretes were evaluated. Results show that when exposed to 5% sodium sulfate solution, MWCNTs could enhance the mechanical and durability properties of concrete subjected to combined freeze–thaw cycles and sulfate attack, regardless of the dosage of MWCNTs. The deterioration resistant of MWCNTs concrete was not increase with the increase dosage of MWCNTs. And the best resistance performance was obtained in concrete containing lower dosage of MWCNTs. In addition, MWCNTs could promote formation of hydration and corrosion products, and delay deterioration of concrete was demonstrated by SEM and thermogravimetric analysis.

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Developments in defining exposure classes for durability design and specification

Beushausen

Ndawula

Helland³

et al. 2021

Structural Concrete

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Durability design and service life modeling of concrete structures rely on environmental exposure classes based on the prevailing deterioration mechanisms. International standard environmental exposure classes, for example, those found in the fib Model Code 2010 and ISO 22965‐1:2007 are predominantly based on European environmental conditions. Although these exposure classes are more suited to the prescriptive design for durability, they may also be adapted to performance‐based design. For more complex design philosophies such as limit state design using partial factors, the generalizations of the standard exposure classes cannot be suitably employed and therefore a more rigorous characterization of the exposure environment is required. The standard exposure classes in the fib Model Code 2010 as well as various national codes from different regions of the world are critically reviewed, and their limitations highlighted. Based on the review, updates to the standard exposure classes for inclusion in the fib Model Code 2020 are proposed. This paper summarizes the work of TG8.8 WP3 (Commission 8: Durability, Task Group 8.8: Common approaches, Working Party 3: Exposure Zones) and represents the view of the Working Party members.

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Resistance of recycled aggregate concrete containing low- and high-volume fly ash against the combined action of freeze–thaw cycles and sulfate attack

Cited by 99 publications

References 39 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

Effect of the dosage of MWCNT's on deterioration resistant of concrete subjected to combined freeze–thaw cycles and sulfate attack

Developments in defining exposure classes for durability design and specification

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