Influence of freeze-thaw cycles on capillary absorption and chloride penetration into concrete

Zhang, Peng; Wittmann, Folker H.; Vogel, Michael; Müller, Harald; Zhao, Tong

doi:10.1016/j.cemconres.2017.05.018

Cited by 376 publications

(110 citation statements)

References 11 publications

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“…Many factors affect the durability of concrete, such as reinforcement corrosion, freeze–thaw cycles, concrete carbonization, and chloride ion erosion, which are directly influenced by moisture transportation . Absorption is one of the key mechanisms of moisture transportation in cement‐based materials and is closely related to pore structure . The pores of cement‐based materials mainly include gel pores and capillary pores, according to the pore system .…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Zhao

Ding

Huang

et al. 2019

Structural Concrete

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Capillary absorption capacity has an important influence on the durability of concrete and is closely related to pore structure. In this study, the pore structure and capillary water absorption of samples were determined by low-field nuclear magnetic resonance spectroscopy and the gravimetric method, respectively. The test results show that the most probable pore diameter and equivalent pore diameter of cement-based materials increase with increasing water to cement ratio (w/c) and fly ash (FA) content and decrease with increasing curing age and cement to sand ratio (c/s). The porosity of cement-based materials increases with increasing w/c and c/s, decreases with increasing curing age, and first decreases and then increases with increasing FA content. The curves for the amount of capillary water absorption per unit area in specimens with the square root of time for cement-based material under different influence factors are similar and show obvious linear and stable stages.The capillary absorption coefficient is nearly linearly related to w/c or c/s, and nonlinearly related to curing age or FA content, observation that are well correlated with the porosity and square root of the equivalent pore radius. A modified model is proposed for the capillary absorption coefficient with consideration of the pore structure, and the theoretical results of the model are in good agreement with the test results. K E Y W O R D Scapillary absorption coefficient, cement-based materials, equivalent pore radius, low-field nuclear magnetic resonance spectroscopy, modified model, porosity Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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Section: Introductionmentioning

confidence: 99%

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Zhao

Ding

Huang

et al. 2019

Structural Concrete

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“…Yu et al [17], as well as Muthulingam and Rao [18] presented the effects of mineral admixtures on the chloride permeability, and they found that appropriate content of mineral admixture reduced the chloride permeability. Zhang et al [19] further studied the impact of freeze-thaw damage on the chloride permeability, and the results highlighted that the freeze-thaw damage enhanced the chloride permeability. e works of Fu et al [20] and Wang et al [21] demonstrated that the chloride permeability increased with the increase of imposed loading damage.…”

Section: Introductionmentioning

confidence: 99%

Effects of High Temperature and Cooling Pattern on the Chloride Permeability of Concrete

Duan

2019

Advances in Civil Engineering

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Concrete structure is frequently subjected to the fire attack, whereas the permeability of concrete with fire-damage has received little consideration. is paper aims to investigate the chloride permeability of plain concrete and recycled aggregate concrete (RAC) with fire-damage, and the effects of various cooling patterns and recuring treatment on the chloride permeability are also studied. e results manifest that the elevated temperatures result in an increase in the fire-damage and chloride permeability of concrete, and that the increase becomes more obvious with the temperature above 400°C. Attributing to the water-cooling which provides a recuring environment, the chloride permeability after water-cooling is lower than that after air-cooling when the temperature is 200°C. Whereas when the temperature is above 400°C, the chloride permeability after water-cooling becomes higher than that after air-cooling, due to an extra damage that the water-cooling produces. e recuring treatment can reduce the chloride permeability of concrete with fire-damage, and the reduction becomes more significant when the concrete suffers a serious fire-damage. Exposing to the same condition of high temperature, the addition of recycled aggregate (RA) further boosts the fire-damage and chloride permeability of concrete. Particularly, the chloride permeability increases with the increasing of RA replacement ratios, linearly, and the increased temperatures further lead to an increase in the slope of the fitting straight line.

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“…Aggressive ions penetration into concrete is mainly by the medium of water penetration, and the water permeability is also an important indicator of concrete durability [139,140]. Ding et al [141] investigated the water permeability of RAC by a capillary absorption test, and the results demonstrated that the adding RA increased the water permeability of concrete; such as, the absorbed water amount of concrete with 100%, 50%, and 30% RA replacement was, respectively, 1.52, 1.39, and 1.32 times as high as that of NAC.…”

Section: Other Durability Propertiesmentioning

confidence: 99%

Durability Studies on the Recycled Aggregate Concrete in China over the Past Decade: A Review

Yang

et al. 2019

Advances in Civil Engineering

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Since China hosted the Olympic Games in 2008, a mass of construction and demolition (C&D) wastes were produced with the rapid urbanization construction. Recycling the C&D waste into recycled aggregates (RA) is an effective method for reducing the amount of C&D wastes. Many studies on the properties of RA and the durability of recycled aggregate concrete (RAC) were conducted in China over the past decade. Due to the restrictions of various languages, some valuable studies on the durability of RAC are hard to be acquired by the scholars around the world. erefore, this paper is developed to review the studies on the durability of RAC in China, and the shrinkage behavior, chloride permeability, carbonation behavior, and freeze-thaw resistance of RAC are, respectively, introduced. Considering the waste concrete, bricks, and ceramics used in preparing RA are frequently mixed together in China, this study proposes an index of average water absorption rate to quantify the effects of RA types, quality, and replacement percentages on the durability of RAC. Meanwhile, the relationship between the average water absorption rate of RA and the durability parameters of RAC is established. Finally, the improving methods of RAC durability are introduced, and the RA particle shaping and carbonation modification are emphasized.

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Influence of freeze-thaw cycles on capillary absorption and chloride penetration into concrete

Cited by 376 publications

References 11 publications

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Effects of High Temperature and Cooling Pattern on the Chloride Permeability of Concrete

Durability Studies on the Recycled Aggregate Concrete in China over the Past Decade: A Review

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