Mechanical Performance and Microscopic Mechanism of Coastal Cemented Soil Modified by Iron Tailings and Nano Silica

Song, Xiaoguo; Xu, Huibi; De-qin, Zhou; Yao, Kai; Tao, Feifei; Jiang, Ping; Wang, Wei

doi:10.3390/cryst11111331

Cited by 8 publications

(5 citation statements)

References 30 publications

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“…This is because nano clay can fill the pores between LS particles and make its internal structure more dense. Secondly, nano clay can promote the further reaction of LS, and on the other hand, it can have pozzolanic reaction with LS [30][31][32][33]. The volcanic ash reaction generates a sheet structure, as shown in Figure 6a.…”

Section: Ucs Test Resultsmentioning

confidence: 99%

The Elastic Modulus and Damage Stress–Strain Model of Polypropylene Fiber and Nano Clay Modified Lime Treated Soil under Axial Load

et al. 2022

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Using polypropylene fiber (PPF) and nano clay modified lime treated soil (LS), the static and dynamic properties of fiber modified lime treated soil (FLS), nano clay modified lime treated soil (NLS), and fiber nano clay composite modified lime treated soil (NFLS) were studied. Through the unconfined compressive strength (UCS) test and dynamic triaxial test of FLS, NLS, and NFLS, the static and dynamic elastic modulus characteristics at 7 day curing age were explored, and the damage stress–strain model was established. The results show that: (1) Polypropylene fiber and nano clay can significantly enhance the mechanical properties of NFLS. Nano clay can promote the reaction between lime and soil to produce calcium silicate hydrate (C-S-H) and calcium aluminate hydrate (C-A-H), thus improving the strength of NFLS, and UCS can be increased by up to 103%. Polypropylene fiber can enhance the ductility of NFLS and increase the residual ductility strength, and the residual strength can be increased by 827%. (2) Nano clay can enhance the static and dynamic elastic modulus of modified lime treated soil. The static and dynamic elastic modulus of NLS, FLS, and NFLS are linear with the change of polypropylene fiber and nano clay content. The static and dynamic elastic modulus of NLS, FLS, and NFLS are linear, exponential, and logarithmic, respectively. (3) The mesoscopic random damage model can characterize the stress–strain relationship of NFLS. Polypropylene fiber and nano clay can improve the ductility and strength of modified LS, and the composite addition of polypropylene fiber and nano clay can improve the ability of modified LS to resist damage.

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Section: Ucs Test Resultsmentioning

confidence: 99%

The Elastic Modulus and Damage Stress–Strain Model of Polypropylene Fiber and Nano Clay Modified Lime Treated Soil under Axial Load

et al. 2022

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“…Cement is widely used to enhance coastal clay due to its good improvement effect on mechanical properties [4,5], but cement stabilized soil still has some issues include low tensile strength and high brittleness. Therefore, to further improve the engineering performance of coastal cement-clay, adding new solidified materials to cement has become the research direction of today's scholars [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Strength and freeze-thaw cycle resistance of cement stabilized coastal clay mixed with shell powder

Liu

Wang

2023

Mater. Res. Express

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To study the effect of marine shell powder (SP) on the mechanical properties of cement solidified coastal clay (CSC), unconfined compressive strength test, freeze-thaw cycle test and Scanning Electron Microscope test were conducted on the stabilized soil. The results show that SP could improve the mechanical properties of CSC to some extent. When the SP content was 15%, the strength of CSC was the highest. Moreover, under the condition of freeze-thaw cycle, SP can enhance the compactness of coastal cement-clay, which shows that the pore area decreases by 7.2% during 7 freeze-thaw cycles. Finally, a mathematical empirical model of the unconfined compressive strength, SP content and freeze-thaw cycles of coastal cement-clay modified by seashell powder (SPCSC) specimens was established. The model has a good relevance with the investigated data, which can give a theoretical foundation for improving the performance of coastal cement-clay using seashell powder under different environments.

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“…According to statistics, the amount of iron tailings produced in China every year has reached more than 150 million tons, which occupies a lot of land and causes a certain burden on the environment and a waste of resources [14,15].…”

Section: Introductionmentioning

confidence: 99%

Research on Compressive Tests of Iron Tailing and Cement-Modified Earth Materials from Northwest China

Lu,

Zhang,

2023

Advances in Civil Engineering

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The strength of earth-modified materials is an important mechanical indicator of raw soil building materials. Iron tailings are a rich mineral waste resource with basic properties similar to river sand and can be used as a modified material for raw soil construction. To increase the utilization rate of iron tailings and improve the mechanical properties of earth materials, modification of earth materials were analyzed using iron tailings and cement. Through a single lattice theory design method, 10 different blending ratios of modified earth specimens were designed, with each group comprising six 100 mm cubic specimens. Earth specimens were used as the control group and compression tests carried out under standard curing conditions, with analysis of the failure mode, compressive strength, deformation, and load–displacement curve for each specimen. Also, the reasons for specimen failures were examined, including the influence of strength, dispersion, and implications of load–displacement curves. The optimal mix ratio of modified materials was determined using frequency domain analysis method. The results showed that the load–displacement curves of materials with different material ratios were basically similar and the slope and discreteness of the curves quite different. Increased tailings and cement content improved the compressive strength of earth materials and increased the discreteness of the material. Through frequency analysis, it was obtained that when the content of tailings was 12.1%–19.5%, cement content 13.9%–19.1%, and earth 65.5%–69.9%, there was a 95% of the guaranteed rate of compressive strength of iron tailings and cement-modified earth materials between 6 and 9 MPa. Iron tailings can, thus, be used as the preferred material for modifying earth materials; single lattice theory can be used as the design method for mixing experiments, and frequency domain analysis can be an effective calculation method for optimizing mixing design. Adding cement and iron tailings to modify the raw soil formula can provide reference for the selection of basic materials for raw soil construction.

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Mechanical Performance and Microscopic Mechanism of Coastal Cemented Soil Modified by Iron Tailings and Nano Silica

Cited by 8 publications

References 30 publications

The Elastic Modulus and Damage Stress–Strain Model of Polypropylene Fiber and Nano Clay Modified Lime Treated Soil under Axial Load

The Elastic Modulus and Damage Stress–Strain Model of Polypropylene Fiber and Nano Clay Modified Lime Treated Soil under Axial Load

Strength and freeze-thaw cycle resistance of cement stabilized coastal clay mixed with shell powder

Research on Compressive Tests of Iron Tailing and Cement-Modified Earth Materials from Northwest China

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