Unconfined Compressive Properties of Fiber-Stabilized Coastal Cement Clay Subjected to Freeze–Thaw Cycles

Li, Na; Zhu, Y. T.; Zhang, Fang; Lim, Sin Mei; Wu, Wangyi; Wang, Wei

doi:10.3390/jmse9020143

Cited by 15 publications

(9 citation statements)

References 42 publications

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“…(2) Environmental factors have a certain influence on the UCS of CMS, so it is necessary to study the modification of time effect model of CMS by dry wet cycles and freeze-thaw cycles. (3) e role of other materials such as nanomaterials [32,33], polymer materials [34][35][36], and fibers [37][38][39][40] can improve the mechanical properties of building materials, and it is necessary to study the application of these materials in CMS modification.…”

Section: Discussionmentioning

confidence: 99%

The Time Effect and Micromechanism of the Unconfined Compressive Strength of Cement Modified Slurries

Jiang

Chen

Zhou

et al. 2021

Advances in Materials Science and Engineering

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This study investigated the unconfined compressive strength change law of cement modified slurries (CMS) under different curing ages. We conducted unconfined compressive strength tests using slurry and cement as raw materials. The cement contents were 5%, 10%, 15%, 20%, and 25%. The curing ages were 7, 14, 28, 56, 90, 120, 150, and 180 d. A time effect model of CMS strength was established based on the measured UCS strength-curing age and the strength-cement content curves. The test results proved that the UCS of the CMS increased significantly with an increase in the curing age, and after 90 days, the UCS gradually increased to a fixed value. The time effect model better characterized the relationship between the UCS of the CMS and the curing age and the cement content, as the predicted value had a high correlation with the measured value. We conducted scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and X-ray diffraction (XRD) tests to analyze the microstructure and chemical composition of the CMS. The microscopic test results demonstrated that the increase of cement content and curing age increased the amount of gelling substances in the CMS and made the overall structure more compact, thereby increasing its macro strength.

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Section: Discussionmentioning

confidence: 99%

The Time Effect and Micromechanism of the Unconfined Compressive Strength of Cement Modified Slurries

Jiang

Chen

Zhou

et al. 2021

Advances in Materials Science and Engineering

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“…Presently, Portland cement is the most widely used cementing and curing material in engineering. There are many studies on the use of Portland cement in the reinforcement of foundation materials [8][9][10][11]. Because Portland cement has a good solidification effect on ordinary foundation soil, researchers have also carried out many related studies on cement reinforced calcareous sand.…”

Section: Introductionmentioning

confidence: 99%

Study on Triaxial Mechanical Properties and Micro Mechanism of Fly Ash Reinforced Cement Calcareous Sand

Li¹,

Li²,

Fang³

et al. 2022

Journal of Renewable Materials

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In order to study the mechanical properties and micro-mechanism of industrial waste fly ash-reinforced cement calcareous sand (FCS), the triaxial unconsolidated undrained (UU) test and scanning electron microscope tests (SEM) were carried out on it. The results of UU test show that the peak stress and energy dissipation of the FCS sample first increase and then decrease with the increase in fly ash content. Fly ash enhances the cement calcareous sand by increasing both the cohesion and internal friction angle, and adding 10% content of fly ash gives the largest values. The SEM test results shows that the hydration products of cement and fly ash filled the pores and cracks on the surface of the calcareous sand, which increased the compactness and structure of the FCS samples. The porosity of cement calcareous sand can be reduced from 27.6% to 12.8% by adding 10% fly ash. A brittleness evaluation index based on energy dissipation is proposed to quantitatively characterize the brittleness of FCS samples. The results show that when the content of fly ash is 5%, the brittleness of FCS samples is the lowest. This study shows that the mechanical properties of cement calcareous sand can be effectively enhanced by adding the appropriate amount of fly ash.

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“…For example, Liu et al studied the heterogeneity in strength and Young's modulus of cement-admixed clay slabs using random finite-element analyses, considering three sources of variation: namely, a deterministic radial trend in strength and Young's modulus; a stochastic fluctuation component due to non-uniform mixing; and positioning errors arising from off-verticality of the mixing shafts [3]. Li et al studied the influence of the number of freeze-thaw cycles and curing ages on the mechanical properties of ordinary cemented clay and polypropylene fiber-cemented clay [4]. Liu et al examined the interaction between the spatial variations in binder concentration and in situ water content, in cement-mixed soil, using field and model data as well as statistical analysis and random field simulation [5].…”

Section: Introductionmentioning

confidence: 99%

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

Song

De-qin

et al. 2021

Crystals

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In order to explore the effect of composite materials on the mechanical properties of coastal cement soil, cement soil samples with different iron tailings and nano silica contents were prepared, and unconfined compression and scanning electron microscope tests were carried out. The results show that: (1) The compressive strength of cement soil containing a small amount of iron tailings is improved, and the optimum content of iron tailings is 20%. (2) Nano silica can significantly improve the mechanical properties of iron tailings and cement soil (TCS). When the content of nano silica is 0.5%, 1.5%, and 2.5%, the unconfined compressive strength of nano silica- and iron tailings-modified cement soil (STCS) is 24%, 137%, and 323% higher than TCS, respectively. (3) Nano silica can promote the hydration reaction of cement and promote the cement hydration products to adhere to clay particles to form a relatively stable structure. At the same time, nano silica can fill the pores in TCS and improve the compactness of STCS.

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Unconfined Compressive Properties of Fiber-Stabilized Coastal Cement Clay Subjected to Freeze–Thaw Cycles

Cited by 15 publications

References 42 publications

The Time Effect and Micromechanism of the Unconfined Compressive Strength of Cement Modified Slurries

The Time Effect and Micromechanism of the Unconfined Compressive Strength of Cement Modified Slurries

Study on Triaxial Mechanical Properties and Micro Mechanism of Fly Ash Reinforced Cement Calcareous Sand

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

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