Meso-scale mechanical deterioration of mortar subjected to freeze thaw cycles and sodium chloride attack

Wang, Yi; Li, Junhui; Ueda, Tamon; Zhang, Dawei; Deng, Jun

doi:10.1016/j.cemconcomp.2020.103906

Cited by 33 publications

(5 citation statements)

References 51 publications

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“…generated osmotic pressure caused by the difference in solution concentration between unfrozen and frozen pores, the expansion stress caused by salt crystallization also damage the concrete [128], as shown in Fig. 17.…”

Section: Liu Et Almentioning

confidence: 99%

“…However, the beneficial effects of these chemical attacks on resistance to freeze-thawing of concrete mainly occur in the initial stage of FTCs. With extended exposure duration, on the other hand, the crystallization of chloride salts [128], formation of ettringite and gypsum from sulphate corrosion [129], and accumulation of carbonate salts [127], can all generate high crystallization pressures and expansion forces in concrete, coupled with the hydrostatic pressure caused by FTCs, to accelerate the deterioration of concrete.…”

Section: Liu Et Almentioning

confidence: 99%

See 1 more Smart Citation

A review of concrete properties under the combined effect of fatigue and corrosion from a material perspective

Liu

Wang

González-Libreros

et al. 2023

Construction and Building Materials

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Section: Liu Et Almentioning

confidence: 99%

Section: Liu Et Almentioning

confidence: 99%

A review of concrete properties under the combined effect of fatigue and corrosion from a material perspective

Liu

Wang

González-Libreros

et al. 2023

Construction and Building Materials

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“…During the freezing-thawing cycles, (i) freezing increases hydraulic water pressure and augments volume; (b) ice crystals are formed within the capillary pores; and (iii) in the liquid state, the lack of acid-base equilibrium results in osmotic pressure [19,29]. The doped SF could transform into reactive Si(OH)4 under alkaline activation, which could crosslink the (N, C)-A-S-H and facilitates the chain propagation, leading to an increase in the pore volume with pore diameter<20 nm, as well as the reduced free water within the binder.…”

Section: Mechanical Properties Of Specimens Subjected To Freeze-thaw ...mentioning

confidence: 99%

“…Additionally, the frost-thawing resistance of alkali-activated binder is also crucial to evaluate its usability [18], especially for the severe-cold region. Because of the coupling effect of internal frost-heave stress induced by phase transition and external frost-heave stress induced by ice contraction [19], the alkali-activated slag/FA binder is vulnerable and fragile to undertake the frost attack. Regarding the SF doped alkali-activated slag/FA binder, the SF could improve the mechanical strength, but the freeze-thaw resistance of the trinary binder needs to be clarified because a higher compressive strength does not necessarily indicate a better freeze-thaw resistance [20].…”

Section: Introductionmentioning

confidence: 99%

Silica Fume Improves the Frost Resistance of Alkali-activated Slag/fly Ash Geopolymer Binder

Wang¹,

Liu²,

Mo³

et al. 2023

Preprint

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Benign design of alkali-activated slag/FA geopolymer paste has intriguing increasing attention for optimizing its service performance. Therefore, the replacement of fly ash (FA) with 10 wt% silica fume (SF) is investigated by mechanical strength after freeze-thawing cycles and microstructure characterization. The results show that an appropriate dosage (30 wt%) of slag is necessary to attain alkali-activated slag/FA geopolymer paste with excellent mechanical performance, and the SF/slag/FA (SF: slag: FA= 10:30:60, wt%) geopolymer paste exerts the compressive and flexural strength of 95.2 and 3.2 MPa, respectively. Meanwhile, the doped 10 wt% SF facilitates the propagation of (N, C)-A–S–H chains, rather than the formation of C-S-H gels, evidenced by the absent exothermic peak at about 861oC from the differential scanning calorimetry (DSC) curves, leading to the increases in the pores volume with a pore diameter<20 nm and tortuosity by mercury intrusion porosimeter (MIP) results, corresponding to an improved freezing-thawing resistance with the residual compressive strength of 52.8 MPa and the weight loss of 10.5% after 300 freeze-thawing cycles. It explores a cost-effective and benign facile approach to designing heating curing-free alkali-activated slag/FA geopolymer paste with good freezing-thawing resistance.

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“…In the freeze-thaw environment with constant water supply, with the progress of freeze-thaw cycle (FTC), the internal damage of concrete gradually accumulates, and when the damage reaches a certain degree, the concrete spalling phenomenon appears. 28 Previous studies have also shown that when a concrete suffers the FTCs, the ITZ between coarse aggregate and mortar is the weakest point to crack, and the damage to mortar is smaller than ITZ; however, the NA is rather unaffected. 15,29 Therefore, it is feasible to use the FTC to remove the attached mortar of RA.…”

Section: Introductionmentioning

confidence: 98%

Removing attached mortar from recycled aggregate by the combined freeze–thaw cycles and high‐temperature drying

Gong

Zhi

et al. 2021

Structural Concrete

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The fundamental reason for the poor performance of recycled aggregate (RA) and recycled aggregate concrete (RAC) is the attached mortar, which severely restricts the application of RA and RAC. This research proposes an innovative method for the modification of RA: using the freeze–thaw cycle (FTC) to remove the attached mortar. In addition, to improve the spalling efficiency, high temperature drying is introduced before and during FTCs. The results show that as the lowest temperature of FTC decreases, the spalling rate increases. Besides, the attached mortar that suffered from high temperature drying is more likely to be peeled off during the following FTCs, and more times of high temperature drying treatments can provide higher efficiency. At the same time, vibrating process can introduce mechanical damage, which is also beneficial for the removal of mortar. Finally, after proper combination of FTC, high temperature drying and vibrating, all attached mortar can be peeled off quickly, and the physical/mechanical properties of modified RA can be very close to the natural aggregates.

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Meso-scale mechanical deterioration of mortar subjected to freeze thaw cycles and sodium chloride attack

Cited by 33 publications

References 51 publications

A review of concrete properties under the combined effect of fatigue and corrosion from a material perspective

A review of concrete properties under the combined effect of fatigue and corrosion from a material perspective

Silica Fume Improves the Frost Resistance of Alkali-activated Slag/fly Ash Geopolymer Binder

Removing attached mortar from recycled aggregate by the combined freeze–thaw cycles and high‐temperature drying

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