Experimental study on microstructure evolution of aeolian sand concrete under the coupling freeze–thaw cycles and carbonation

Zou, Yue; Xiang‐dong, Shen; Zuo, Xiao-Bao; Xue, Huijun; GenFeng, Li

doi:10.1080/19648189.2019.1707712

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…Through the use of nuclear magnetic resonance (NMR), Zou et al [36] investigated the development of F-T pores in AS concrete. Their results indicated that AS has the potential to alter the pore arrangement of concrete, leading to variations in its strength and resistance to frost.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Shear Mechanical Properties of Fractured Rock Mass Reinforced by Aeolian-Sand (AS) Cement Mortar after Freeze-Thaw (F-T) Cycles

Liu,

Chen,

Zhang

et al. 2024

Preprint

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The rock joint fissure slope in cold regions is prone to deformation and failure problems such as relaxation, tension and collapse under freeze-thaw (F-T) cycles. Based on the ideology of clean production and promoting the structural integrity of geotechnical projects in cold areas, this study designed and prepared aeolian-sand (AS) to replace part of river sand as a filling mortar material by taking advantage of the low cost and easy availability of AS. Investigations were carried out to determine the impact of varying proportions of AS in mortar on the microstructure and shear properties of the mortar-rock interface under F-T cycles. Therefore, F-T cycle testing, nuclear magnetic resonance (NMR) testing and shear testing were carried out on grout with different proportions of AS. The results show that the right proportion of AS replacement could enhance the shear deformation resistance and F-T resistance of the mortar-rock interface, and 30% proportion is the optimal proportion. By increasing of F-T cycles, the three types of specimens showed different degrees of particle spalling, shedding and cracking. The slurry-rock interface layer in the A (0%) group exhibited the most severe F-T deterioration, while the B (15%) group showed a lesser degree, and the C (30%) group performed the best. T2 spectrum curve and total spectrum area change law from the microscopic point of view to verify the 30% AS proportion mortar-rock interface F-T resistance is the strongest, followed by 15% AS proportion mortar, the weakest is ordinary mortar. The degradation of the mortar-rock bond is primarily due to the conversion of solid to liquid phases and the movement of internal water caused by fluctuating temperatures. The extent of F-T deterioration in the slurry-rock interface layer is greatly affected by the varying proportions of AS. The shear strength and shear stiffness of specific proportion of AS decreased with the increase of F-T cycles. For same F-T cycles, the shear strength and shear stiffness of group C (30%) were the highest, followed by group B (15%) and group A (0%). The grout material not only reinforces the F-T joint fissure slope, but also reduces the cost of grout reinforcement and promotes the clean production of geotechnical structures.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Shear Mechanical Properties of Fractured Rock Mass Reinforced by Aeolian-Sand (AS) Cement Mortar after Freeze-Thaw (F-T) Cycles

Liu,

Chen,

Zhang

et al. 2024

Preprint

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“…They confirmed that the optimum substitution rate of AS was 20-30% of river sand. There have been relevant studies on the fundamental properties and frost resistance of AS concrete and recycled concrete [27][28][29][30][31][32][33][34]. However, there are limited reports on the freeze resistance of AS utilized in RAC.…”

Section: Introductionmentioning

confidence: 99%

Frost Durability of Self-Compacting Concrete Prepared with Aeolian Sand and Recycled Coarse Aggregate

Yan,

Liu,

Han

et al. 2023

Materials

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Aeolian sand (AS) and recycled coarse aggregate (RCA) can be reasonably utilized as green materials for concrete modification. The paucity of natural sand and gravel in the construction industry is anticipated to be remedied by the use of these two eco-friendly concrete ingredients. This is incredibly important for environmental protection. Study on the damage law of self-compacting concrete with the addition of AS and RCA (ARSCC) under severely cold conditions is of great significance for the promotion and implementation of this material. In this study, 12 groups of ARSCC specimens were prepared for freeze–thaw cycle experiments, with AS substitution rates of 0, 20%, 40%, and 60% as well as RCA replacement rates of 0, 25%, and 50%. Then, the degradation mechanism of ARSCC freeze–thaw damage was discussed from both macroscopic and microscopic perspectives via mass loss rate (Wn), relative dynamic modulus of elasticity (Pn), bubble spacing factor, and SEM analysis. Finally, the response surface method was utilized to determine the damage variable. A freeze–thaw damage model for ARSCC was developed based on the Weibull distribution and Grey theories. The results showed that the Pn could reflect the evolution law of the internal structure of ARSCC. Appropriate addition of AS to fill the large, harmful pores in RCA would inhibit freeze–thaw damage of ARSCC. The optimum substitution rates of AS and RCA were determined to be 20–40% and 25–50%, respectively. In addition, the values obtained from theoretical damage modeling and experiments were in good agreement. The acquired damage model had the potential to predict ARSCC damage under freeze–thaw cycles.

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“…Freeze-thaw (F-T) cycles may adversely, as well as very quickly affect the durability of concrete structures. From a research point of view, it is appropriate to monitor the behaviour of concrete already during the actual exposure to freeze-thaw cycles [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Acoustic Emission Signals Recorded during Freeze-Thaw Cycling of Concrete

et al. 2021

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This manuscript deals with a complex analysis of acoustic emission signals that were recorded during freeze-thaw cycles in test specimens produced from air-entrained concrete. An assessment of the resistance of concrete to the effects of freezing and thawing was conducted on the basis of a signal analysis. Since the experiment simulated testing of concrete in a structure, a concrete block with the height of 2.4 m and width of 1.8 m was produced to represent a real structure. When the age of the concrete was two months, samples were obtained from the block by core drilling and were subsequently used to produce test specimens. Testing of freeze-thaw resistance of concrete employed both destructive and non-destructive methods including the measurement of acoustic emission, which took place directly during the freeze-thaw cycles. The recorded acoustic emission signals were then meticulously analysed. The aim of the conducted experiments was to verify whether measurement using the acoustic emission method during Freeze-thaw (F-T) cycles are more sensitive to the degree of damage of concrete than the more commonly employed construction testing methods. The results clearly demonstrate that the acoustic emission method can reveal changes (e.g., minor cracks) in the internal structure of concrete, unlike other commonly used methods. The analysis of the acoustic emission signals using a fast Fourier transform revealed a significant shift of the dominant frequency towards lower values when the concrete was subjected to freeze-thaw cycling.

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Experimental study on microstructure evolution of aeolian sand concrete under the coupling freeze–thaw cycles and carbonation

Cited by 8 publications

References 28 publications

Microstructure and Shear Mechanical Properties of Fractured Rock Mass Reinforced by Aeolian-Sand (AS) Cement Mortar after Freeze-Thaw (F-T) Cycles

Microstructure and Shear Mechanical Properties of Fractured Rock Mass Reinforced by Aeolian-Sand (AS) Cement Mortar after Freeze-Thaw (F-T) Cycles

Frost Durability of Self-Compacting Concrete Prepared with Aeolian Sand and Recycled Coarse Aggregate

Analysis of Acoustic Emission Signals Recorded during Freeze-Thaw Cycling of Concrete

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