A Study of the Durability of Aeolian Sand Powder Concrete Under the Coupling Effects of Freeze–Thaw and Dry–Wet Conditions

Li, Gen Feng; Shen, Xiang

doi:10.1007/s11837-019-03440-9

Cited by 15 publications

(3 citation statements)

References 14 publications

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“…The specimen loss rate rises and then falls during the early stage of freezing and thawing. The reaction products fill the small pores, which improves the quality of the specimens, slows the mass loss rate [22], increases gradually with increasing cycling times, the expansion of pores and microcracks, and the continuous appearance of surface sanding and pitting, resulting in a substantial decline in quality [23]. The mass loss rate of the TWGPC specimens increases rapidly.…”

Section: Mass Loss Ratementioning

confidence: 99%

Degradation mechanism and life prediction of tailings and waste rock aggregate geopolymer concrete under freeze-thaw corrosion

Sun

Wang

et al. 2022

Mater. Res. Express

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To study the durability of tailings and waste rock aggregate geopolymer concrete (TWGPC), a large number of tailings and waste rock were used to replace natural sand and stone as aggregates, and a fly ash geopolymer was used to replace cement as cementing material to prepare TWGPC. The slow freezing method was used to carry out single freeze-thaw and freeze-thaw corrosion tests. Scanning electron microscopy and energy dispersive spectroscopy (SEM–EDS) were used to analyse the microstructure and reaction products of TWGPC. The degradation mechanism of TWGPC was studied, and the life of TWGPC was predicted. The results show that the higher the concentration of corrosion solution was, the more significant the change trend of the mechanical properties test results. In the early stage of the cycle, acinar gypsum and short columnar ettringite were generated to fill the pores and improve the compactness and frost resistance of TWGPC. In the late stage of the cycle: calcium-silicate-hydrate (C-S-H) was decomposed and gradually replaced by magnesium-silicate-hydrate (M-S-H). The cohesion between mortar and aggregate was reduced, and a large number of products were generated. Cl- inhibited the transmission rate of SO42- and reduced the erosion effect of SO42- on TWGPC. The single freezing-thawing life prediction model had high accuracy, and the life prediction conclusion based on reliability was consistent with the appearance damage analysis, mechanical property testing and microscopic morphology analysis.

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Section: Mass Loss Ratementioning

confidence: 99%

Degradation mechanism and life prediction of tailings and waste rock aggregate geopolymer concrete under freeze-thaw corrosion

Sun

Wang

et al. 2022

Mater. Res. Express

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“…This observation reaffirms coal-gangue concrete's characteristics of high brittleness and limited ductility. Li Qingwen et al [24][25][26] examined the durability of coal-gangue concrete exposed to alternating freeze-thaw cycles and carbonization environments. Their experimental findings indicated a positive correlation between the water-cement ratio of coal-gangue concrete and carbonation depth.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical Properties of Hybrid Basalt-Polypropylene Fibre-Reinforced Gangue Concrete

Yang,

Xin,

Sun

et al. 2024

Applied Sciences

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Incomplete data indicate that coal gangue is accumulated in China, with over 2000 gangue hills covering an area exceeding 200,000 mu and an annual growth rate surpassing 800 million tons. This accumulation not only signifies a substantial waste of resources but also poses a significant danger to the environment. Utilizing coal gangue as an aggregate in the production of coal-gangue concrete offers an effective avenue for coal-gangue recycling. However, compared with ordinary concrete, the strength and ductility of coal-gangue concrete require enhancement. Due to coal-gangue concrete having higher brittleness and lower deformation resistance than ordinary concrete, basalt fibre (BF) is a green, high-performance fibre that exhibits excellent bonding properties with cement-based materials, and polypropylene fibre (PF) is a flexible fibre with high deformability; thus, we determine if adding BF and PF to coal-gangue concrete can enhance its ductility and strength. In this paper, the stress–strain curve trends of different hybrid basalt–polypropylene fibre-reinforced coal-gangue concrete (HBPRGC) specimens under uniaxial compression are studied when the matrix strengths are C20 and C30. The effects of BF and PF on the mechanical and energy conversion behaviours of coal-gangue concrete are analysed. The results show that the ductile deformation of coal-gangue concrete can be markedly enhanced at a 0.1% hybrid-fibre volume content; HBPRGC-20-0.1 and HBPRGC-30-0.1 have elevations of 53.66% and 51.45% in total strain energy and 54.11% and 50% in dissipative energy, respectively. And HBPRGC-20-0.2 and HBPRGC-30-0.2 have elevations of 31.95% and 30.32% in total strain energy and −3.46% and 28.71% in dissipative energy, respectively. With hybrid-fibre volume content increased, the elastic modulus, the total strain energy, and the dissipative energy all show a downward trend. Therefore, 0.1% seems to be the optimum hybrid-fibre volume content for well-enhancing the ductility and strength of coal-gangue concrete. Finally, the damage evolution and deformation trends of coal-gangue concrete doped with fibre under uniaxial action are studied theoretically, and the constitutive model and damage evolution equation of HBPRGC are established based on Weibull theory The model and the equation are in good agreement with the experimental results.

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“…36 Under "freeze-thaw + dry-wet" conditions, the relative dynamic elastic modulus is 2.2 times smaller than under "dry-wet + freeze-thaw" conditions. 37 Frost exposure decreases mechanical strength and elastic modulus and facilitates chloride movement across the affected pore system. The addition of silane emulsion to fresh concrete will help to prevent chloride penetration.…”

Section: Introductionmentioning

confidence: 99%

Effect of acids and freeze–thaw on the durability of modified rubberized concrete with optimum rubber crumb content

Kumar

Dev

2022

J of Applied Polymer Sci

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Investigations of the effect of acids and freeze-thaw on pozzolanic cement-based rubberized concrete after surface treatment of rubber crumbs are limited. Rubberized concrete's mechanical and durability properties (water absorption, acid attack resistance, and freeze-thaw attack resistance) are evaluated. Six rubber crumbs content (0%, 10%, 15%, 20%, 25%, and 30%) and particle size 0.6-2.36 mm are used to replace fine aggregate in concrete partially, and 15% replacement level of rubber crumb is found to be the optimum quantity in concrete. Structural analyses show that the specimens remain in the crystalline phase after being submerged in H 2 SO 4 and HCl acid. When rubberized concrete is immersed in H 2 SO 4 and HCl solution with equal concentrations and duration, specimens immersed in HCl solution have been found to have less surface erosion, less weight loss, and lower compressive strength loss. When the conventional concrete mix is immersed in H 2 SO 4 and HCl solution, the losses in compressive strength are 74.56% and 30.34%, but in rubberized concrete, the losses are 60.01% and 24.22% only. No apparent microcracks and no spalling on the surfaces of the specimens are found up to 90 freeze-thaw cycles. Rubberized concrete's ultrasonic velocity decreases slightly up to 90 freeze-thaw cycles, but it still has good concrete quality.

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A Study of the Durability of Aeolian Sand Powder Concrete Under the Coupling Effects of Freeze–Thaw and Dry–Wet Conditions

Cited by 15 publications

References 14 publications

Degradation mechanism and life prediction of tailings and waste rock aggregate geopolymer concrete under freeze-thaw corrosion

Degradation mechanism and life prediction of tailings and waste rock aggregate geopolymer concrete under freeze-thaw corrosion

Experimental Study on the Mechanical Properties of Hybrid Basalt-Polypropylene Fibre-Reinforced Gangue Concrete

Effect of acids and freeze–thaw on the durability of modified rubberized concrete with optimum rubber crumb content

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