Triaxial Mechanical Properties and Micromechanism of Calcareous Sand Modified by Nanoclay and Cement

Wang, Wei; Jian, Li; Hu, Jun

doi:10.1155/2021/6639602

Cited by 7 publications

(5 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results show that GO is easy to interact with calcareous sand, thus affecting its environmental behavior. At the same time, calcareous sand is widely used as a construction material [55], and it is therefore foreseeable that the addition of calcareous sand as a construction material in the construction of GO contaminated sites could also adsorb GO from contaminated sites to avoid GO harming human health through the water cycle, indicating that the adsorption potential of calcareous sand for GO is very high.…”

Section: Discussionmentioning

confidence: 99%

Study on the Adsorption Mechanism of Graphene Oxide by Calcareous Sand in South China Sea

Luo

et al. 2021

Adsorption Science & Technology

View full text Add to dashboard Cite

To remove graphene oxide from wastewater, we used batch experiments with calcareous sand to recover GO. The adsorption properties and mechanisms of GO by calcareous sand were investigated by different characterization techniques. In this paper, the relationship between the coagulation of GO on calcareous sand and pH, calcareous sand content, GO initial concentration, and temperature was studied. The results show that calcareous sand can effectively adsorb GO from aqueous solution, the interaction of GO with calcareous sand achieved interaction equilibrium in 5 h, and the adsorption of GO by calcareous sand strongly depends on pH. The isotherm data fitted to a Langmuir equation. A possible mechanism can be expressed from FT-IR, XRD, Raman spectra, SEM, EDS, TEM, AFM, and XPS results. The test results indicate that calcareous sand is a potentially recoverable GO material.

show abstract

Section: Discussionmentioning

confidence: 99%

Study on the Adsorption Mechanism of Graphene Oxide by Calcareous Sand in South China Sea

Luo

et al. 2021

Adsorption Science & Technology

View full text Add to dashboard Cite

show abstract

“…During backfill mining, nanocomposite fiber-CPB with improved mechanical properties can fully alleviate the migration of the overburden and effectively control the deformation of roadway-surrounding rock. For example, carbon nanotubes (CNTs) can be used to alter the damage degree of the cement matrix and increase the chemical energy of the material, leading to a significant improvement in the compressive strength of the cement matrix [20]. In addition, polypropylene fibers can be used to modify rubber tailings and waste rock fillers [21].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Mechanical Properties and Microstructure of the Cemented Paste Backfill Made by Coal-Based Solid Wastes and Nanocomposite Fibers under Dry–Wet Cycling

Wang,

Cheng,

Zhou

et al. 2024

Materials

View full text Add to dashboard Cite

The mechanical properties and microstructure of the cemented paste backfill (CPB) in dry–wet cycle environments are particularly critical in backfill mining. In this study, coal gangue, fly ash, cement, glass fiber, and nano-SiO2 were used to prepare CPB, and dry–wet cycle tests on CPB specimens with different curing ages were conducted. The compressive, tensile, and shear strength of CPB specimens with different curing ages under different dry–wet cycles were analyzed, and the microstructural damage of the specimens was observed by scanning electron microscopy (SEM). The results show that compared with the specimens without dry–wet cycles, the uniaxial compressive strength, tensile strength, and shear strength of the specimens with a curing age of 7 d after seven dry–wet cycles were the smallest, being reduced by 40.22%, 58.25%, and 66.8%, respectively. After seven dry–wet cycles, the compressive, tensile, and shear strength of the specimens with the curing age of 28 d decreased slightly. The SEM results show that with the increasing number of dry–wet cycles, the internal structure of the specimen becomes more and more loose and fragile, and the damage degree of the structural skeleton gradually increases, leading to the poor mechanical properties of CPB specimens. The number of cracks and pores on the specimen surface is relatively limited after a curing age of 28 d, while the occurrence of internal structural damage within the specimen remains insignificant. Therefore, the dry–wet cycle has an important influence on the both mechanical properties and microstructure of CPB. This study provides a reference for the treatment of coal-based solid waste and facilitates the understanding of the mechanical properties of backfill materials under dry–wet cycling conditions.

show abstract

“…Wang et al studied the mechanical properties of nano-clay and cement composite-modified calcareous sand reinforcement or binder materials, such as cement, fiber, fly ash, and curing agent, ar often used to improve soils' strength and stiffness characteristics [13][14][15][16][17][18][19][20][21][22][23][24][25]. Wang et al stud ied the mechanical properties of nano-clay and cement composite-modified calcareou sand through triaxial unconsolidated undrained and scanning electron microscope tests and found that nano-clay could modify the shear properties of cement calcareous san [26]. Zhang et al investigated the unconfined compressive strength and stiffness of so reinforced with a combination of fibers and lime, and found that the optimum fiber con tent was 1% [27].…”

Section: Introductionmentioning

confidence: 99%

A Contrast Analysis of Deformation Characteristics and Critical Dynamic Stress of Natural and Fiber-Binder Reinforced Subgrade Filler after Different Freeze-Thaw Cycles

Wang

Ling

et al. 2023

Materials

View full text Add to dashboard Cite

To investigate the dynamic stability of natural subgrade filler (NSF) and fiber-binder reinforced subgrade filler (RSF) under cyclic load after freeze–thaw (FT) cycles, a triaxial test was conducted to determine the correlation between cumulative plastic strain (CPS) and the quantity of loading cycles, as well as the evolution law of dynamic strength and critical dynamic stress (CDS) with different FT cycles. The CPS change in the NSF and RSF shows three states (stable, critical, and destructive) with increasing vibration times. However, both fillers have different failure forms, and the curve shapes of the CPS with loading cycle quantities before and after failure are also different. With the number of FT cycles increasing, the requisite dynamic stress threshold for NSF specimen failure decreases continuously. After three FT cycles, the anti-cumulative deformation ability of the NSF decreases by approximately 32%. The anti-cumulative deformation abilities of the NSF after seven and nine FT cycles, respectively, are similar. The amelioration measures could significantly enhance the FT resistance of the NSF. After zero, one, three, five, seven, and nine FT cycles, the requisite dynamic stress threshold for the RSF to reach destruction is increased 1.52, 1.89, 1.98, 2.32, 2.2, and 2.45 times, respectively, compared to that of the NSF. A mechanical model of critical dynamic stress of the NSF and RSF that considers the FT cycle was obtained using a multivariate nonlinear regression method.

show abstract

Triaxial Mechanical Properties and Micromechanism of Calcareous Sand Modified by Nanoclay and Cement

Cited by 7 publications

References 17 publications

Study on the Adsorption Mechanism of Graphene Oxide by Calcareous Sand in South China Sea

Study on the Adsorption Mechanism of Graphene Oxide by Calcareous Sand in South China Sea

An Experimental Study on the Mechanical Properties and Microstructure of the Cemented Paste Backfill Made by Coal-Based Solid Wastes and Nanocomposite Fibers under Dry–Wet Cycling

A Contrast Analysis of Deformation Characteristics and Critical Dynamic Stress of Natural and Fiber-Binder Reinforced Subgrade Filler after Different Freeze-Thaw Cycles

Contact Info

Product

Resources

About