Frost durability of high-volume fly ash concrete: Relation liquid transport - damage

Shpak, Andrei; Gong, Fuyuan; Jacobsen, Stefan

doi:10.1016/j.cemconres.2022.107017

Cited by 17 publications

(6 citation statements)

References 34 publications

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“…It can be seen from Figure 8 that the fibrous hydration C-S-H products were found in A, D, and F specimens without salt freezing cycles, and there were more in the A specimen. The spherical particles of fly ash can be clearly seen in the D specimen, indicating that a large amount of fly ash is still not involved in the secondary hydration, and the pozzolanic effect is not fully reflected [43,44]. There are obvious cracks in the cement stone found in specimens A and E, indicating that the concrete specimens have initial defects.…”

Section: Analysis Of Semmentioning

confidence: 96%

“…The chemical response of limestone powder with 10~20% content in concrete is higher than its physical response, and the frost resistance of concrete decreases with the increase in the limestone powder content. (2) The pozzolanic effects of fly ash and slag increase the secondary hydration products, optimize the pore structure, and improve the compactness of concrete [43][44][45]. However, in the case of the fixed total content of 50%, fly ash is used to replace slag in equal proportion.…”

Section: Relative Dynamic Modulus Of Elasticitymentioning

confidence: 99%

“…The pozzolanic effects of fly ash and slag increase the secondary hydration products, optimize the pore structure, and improve the compactness of concrete [43][44][45]. However, in the case of the fixed total content of 50%, fly ash is used to replace slag in equal proportion.…”

mentioning

confidence: 99%

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Study on the Frost Resistance of Composite Limestone Powder Concrete against Coupling Effects of Sulfate Freeze–Thaw

Zhang,

Lv,

Zhou

et al. 2023

Buildings

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Concrete in saline or coastal settings exposed to freezing temperatures is frequently affected by coupling actions of sulfate assault and freeze–thaw degradation, reducing the service life of concrete structures significantly. This study conducted an accelerated freeze–thaw cycle test in pure water and Na2SO4 solution with a mass proportion of 5% to examine the coupling impact of sulfate freeze–thaw on the frost resistance of composite limestone powder (CLP) concrete. Combined with SEM and XRD methods, the performance degradation mechanisms of composite limestone powder (CLP) concrete in coupling sulfate freeze–thaw conditions were analyzed with a microscopic point of view. The findings demonstrated that limestone powder has a filling effect but the activity is low. When the content is 10~20%, the chemical response is higher than the physical response. The pozzolanic effect of fly ash and slag can improve the pore structure and improve the compactness of concrete. The “superposition effect” of limestone powder, fly ash, and slag can improve the frost resistance of CLP concrete. The scenario of salt freezing cycles has negative effects that are worse than those of water freezing cycles on the antifreeze performance of CLP concrete, including apparent morphology, mass loss, relative dynamic modulus of elasticity, and compressive strength. Sulfate’s activation effect boosts slag’s activity effect, which significantly promotes the antifreeze performance of concrete subjected to salt frozen cycles over water frozen cycles. The freeze–thaw damage model of CLP concrete under coupling sulfate freeze–thaw is established through theorem analysis and experiment statistics, laying a theoretical framework for the popularization and use of this concrete.

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Section: Analysis Of Semmentioning

confidence: 96%

Section: Relative Dynamic Modulus Of Elasticitymentioning

confidence: 99%

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Study on the Frost Resistance of Composite Limestone Powder Concrete against Coupling Effects of Sulfate Freeze–Thaw

Zhang,

Lv,

Zhou

et al. 2023

Buildings

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“…In the literature, most studies on liquid uptake in concrete come to the conclusion that AE increases the uptake, as AE gives an increased porosity [28], [38]. However indications of the opposite behavior for high FA concrete is found in [39]. Even though the liquid uptake is higher is the degree of saturation still lower which gives protection of frost deterioration.…”

Section: 2mentioning

confidence: 99%

Cryosuction Experiments on Concrete Containing Ground Granulated Blast-Furnace Slag: Influence of Temperature, Air Entrainment And Salt

Wahlbom,

Fridh

2023

Nordic Concrete Research

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Frost deterioration of concrete is an important durability issue for structures exposed to high degree of saturation, low temperatures and de-icers. The material can then be severely damaged with internal cracking and/or scaling of the surface, which can lead to e.g. reduced protection of the reinforcement and loss of load bearing capacity. Experiments with liquid uptake in concrete using different temperature cycles was made to study cryosuction. The material used was concrete with different air content and different replacement levels of ground granulated blast-furnace slag (GGBS). The concrete samples were preconditioned by capillary suction. Three temperature conditions were used: constant temperatures of +20 °C and -20 °C, and temperature that cycled between -20 °C and +20 °C. As liquid medium, deionized water and a 3% NaCl salt solution were used. Air entrainment generally increased the liquid uptake. The amount of GGBS and the NaCl concentration in the liquid did not have any significant impact on the liquid uptake in these experiments.

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“…Concrete is the most widely used construction material in the world today; however, during its service, carbonation, sulfate attack, steel corrosion, freeze–thaw cycles, and alkali aggregate reactions occur, all of which can lead to deterioration in the durability performance of concrete materials [ 1 , 2 , 3 ]. The nature of durability deterioration of concrete materials is due to the internal physicochemical reactions that lead to changes in the internal relative humidity and pore structure, and the pore pressure in the pore structure changes with changes in the internal humidity and pore radius of the pores.…”

Section: Introductionmentioning

confidence: 99%

Development of Pore Pressure in Cementitious Materials under Low Thermal Effects: Evidence from Optimization of Pore Structure by Incorporation of Fly Ash

et al. 2023

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Studies on durability of cementitious materials have focused on harsh environments, but less attention has been paid to low thermal loading situations. In this paper, with the aim of exploring the evolution of internal pore pressure and microcrack extension of cementitious under low thermal environment, cement paste specimens with thermal environment slightly below 100 °C and three water–binder ratios (0.4, 0.45 and 0.5) and four fly ash admixtures (0, 10%, 20% and 30%) were designed. Firstly, the internal pore pressure of the cement paste was tested; secondly, the average effective pore pressure of the cement paste was calculated; and finally, the phase field method was used to explore the expansion of microcracks inside the cement paste when the temperature gradually increased. It was found that the internal pore pressure of the paste showed a decreasing trend as the water–binder ratio and fly ash admixture increased, and the numerical simulation found that the sprouting and development of cracks were delayed when 10% fly ash was added to the cement paste, which was consistent with the experimental results. This work provides a basis for the durability development of concrete under low thermal environment.

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Frost durability of high-volume fly ash concrete: Relation liquid transport - damage

Cited by 17 publications

References 34 publications

Study on the Frost Resistance of Composite Limestone Powder Concrete against Coupling Effects of Sulfate Freeze–Thaw

Study on the Frost Resistance of Composite Limestone Powder Concrete against Coupling Effects of Sulfate Freeze–Thaw

Cryosuction Experiments on Concrete Containing Ground Granulated Blast-Furnace Slag: Influence of Temperature, Air Entrainment And Salt

Development of Pore Pressure in Cementitious Materials under Low Thermal Effects: Evidence from Optimization of Pore Structure by Incorporation of Fly Ash

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