Dynamic Triaxial Test and Microscopic Study of Solidified Muddy Soil With Different Mixing Ratios and Curing Ages

Zhou, C.; Xu, Haocheng; Cheng, Mayao; Lu, Hanwen; Wang, Zhijian; Feng, Peiyu

doi:10.3389/fmats.2021.731449

Cited by 4 publications

(4 citation statements)

References 22 publications

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“…Polymers 2023, 15, 1865 6 of 17 to the maximum strain difference (Equation ( 2)) under the action of a cyclic load [45,46]. The calculation formula is shown in Equation (3).…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…A series of hysteresis loops can be obtained under the action of axial cyclic loads [42]. Figure 5 shows a typical hysteresis loop [43,44], where Ed is the ratio of the maximum stress difference (Equation ( 1)) to the maximum strain difference (Equation ( 2)) under the action of a cyclic load [45,46]. The calculation formula is shown in Equation (3).…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…Lime fly ash and sodium silicate underwent hydration, ion exchange, crystallization, and other reactions during maintenance in the soil. The generated cement filled the pores and refined the pore size, thereby making the overall skeleton more compact [45][46][47][51][52][53]. Under the action of cyclic loading, the damage to the overall skeleton was not obvious; therefore, the E d of the SLS decreased slowly with an increase in EC.…”

Section: Test Results and Discussionmentioning

confidence: 99%

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Study on Dynamic Modulus and Damping Characteristics of Modified Expanded Polystyrene Lightweight Soil under Cyclic Load

et al. 2023

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In recent years, expanded polystyrene (EPS) lightweight soil has been widely used as subgrade in soft soil areas because of its light weight and environmental protection. This study aimed to investigate the dynamic characteristics of sodium silicate modified lime and fly ash treated EPS lightweight soil (SLS) under cyclic loading. The effects of EPS particles on the dynamic elastic modulus (Ed) and damping ratio (λ) of SLS were determined through dynamic triaxial tests at various confining pressures (σ3), amplitudes, and cycle times. Mathematical models of the Ed of the SLS, cycle times, and σ3 were established. The results revealed that the EPS particle content played a decisive role in the Ed and λ of the SLS. The Ed of the SLS decreased with an increase in the EPS particle content (EC). The Ed decreased by 60% in the 1–1.5% range of the EC. The existing forms of lime fly ash soil and EPS particles in the SLS changed from parallel to series. With an increase in σ3 and amplitude, the Ed of the SLS gradually decreased, the λ generally decreased, and the λ variation range was within 0.5%. With an increase in the number of cycles, the Ed of the SLS decreased. The Ed value and the number of cycles satisfied the power function relationship. Additionally, it can be found from the test results that 0.5% to 1% was the best EPS content for SLS in this work. In addition, the dynamic elastic modulus prediction model established in this study can better describe the varying trend of the dynamic elastic modulus of SLS under different σ3 values and load cycles, thereby providing a theoretical reference for the application of SLS in practical road engineering.

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“…Polymers 2023, 15, 1865 6 of 17 to the maximum strain difference (Equation ( 2)) under the action of a cyclic load [45,46]. The calculation formula is shown in Equation (3).…”

Section: Test Results and Discussionmentioning

confidence: 99%

Section: Test Results and Discussionmentioning

confidence: 99%

Section: Test Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Study on Dynamic Modulus and Damping Characteristics of Modified Expanded Polystyrene Lightweight Soil under Cyclic Load

et al. 2023

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“…In production process of stabilized/ solidified (S/S) sediments, additives such as cement, lime, fly ash, epoxy resin, MgO-bearing binder, and geopolymer ,etc. are added into and mixed with sediments (Zentar et al, 2012;Wang et al, 2013Wang et al, , 2021Anagnostopoulos, 2015;Chen et al, 2021;Zhu et al, 2021). Stable structures including solidification skeletons and sediment aggregates are produced by solidification reactions between solidification additives and sediments (Zentar et al, 2012;Lemaire et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Strength and Stiffness Degradation Mechanisms of Stabilized/Solidified Sediments by Freeze–Thaw Cycles

Wang

Jing

et al. 2022

Front. Earth Sci.

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Strength and stiffness of stabilized/solidified (S/S) sediments are supposed to be degraded by freeze–thaw cycles (FTs) when applied in constructions in cold regions. In order to reveal the degradation mechanisms, FTs were first simulated on S/S sediments in the laboratory. Then, macrotests including unconfined compression strength (UCS) tests and direct shear tests were conducted on S/S sediments at different FTs to investigate the strength and stiffness changes and microanalyses including scanning electron microscope analysis (SEM), mercury intrusion porosimetry (MIP), and nitrogen adsorption porosimetry (NAP) to investigate the microstructure changes. Macrotests show that strength indexes decrease gradually, stiffness parameters and brittleness increase first and then decrease, the compaction stage of stress–strain curves diminishes first and then increases, the decrease rate of friction angle decelerates first and then accelerates, and the decrease rate of cohesion decelerates first and then keeps stable, for S/S sediments in FTs. Microanalyses have precisely captured the damage chain of S/S sediments: meso and macropores inside sediment aggregates expand gradually during FTs; as a result, sediment aggregates are fractured and stripped off from the solidification skeleton gradually; losing support of sediment aggregates, solidification skeletons are adjusted first and then collapsed when sediment aggregate fracture reaches a limit value. Based on macro and microfindings, a damage model to explain strength and stiffness degradations by microstructure damage is successfully established. Based on the established damage model, a reasonable idea is proposed for promoting the resistance of S/S sediments to FTs.

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Experimental Study on the Corrosion of Fulvic Acid to Cement-Soil and Its Microstructures in the Peat Soil Environment

Cao

Song

Liu³

et al. 2023

Coatings

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In underground engineering, cement-soil reinforcement beneath a peat soil environment is a significant challenge. To investigate the corrosiveness of fulvic acid on cement-soil and its micro and fine structure changes under the peat soil environment (PSE), an experiment was conducted to prepare peat soil by mixing humic acid (HA) into an alluvial clayey soil and then adding cement to make a cement-soil specimen, which was soaked in a fulvic acid (FA) solution and deionized water to simulate the different working of the cement-soil. The experiment was carried out by a scanning electron microscopy (SEM) test, mercury intrusion porosimetry (MIP) test, pore (particle) and fracture image recognition and analysis (PCAS), and unconfined compressive strength (UCS) test on cement-soil with soaking time as the variation factor. The results show that: In the deionized water environment, the structural characteristics of the cement-soil exhibited a gradual enhancement followed by a slight weakening. Conversely, when placed in a peat soil environment, the strength of the cement-soil initially increased at a slow rate due to the gelling and filling impact of fulvic acid. However, in the later stages, the corrosive influence of fulvic acid became dominant. This led to an enlargement of the pore space within the cement-soil, resulting in a gradual deterioration of its structure. Consequently, the strength of the cement-soil displayed a pattern of slow initial increase followed by a rapid decrease.

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Dynamic Triaxial Test and Microscopic Study of Solidified Muddy Soil With Different Mixing Ratios and Curing Ages

Cited by 4 publications

References 22 publications

Study on Dynamic Modulus and Damping Characteristics of Modified Expanded Polystyrene Lightweight Soil under Cyclic Load

Study on Dynamic Modulus and Damping Characteristics of Modified Expanded Polystyrene Lightweight Soil under Cyclic Load

Strength and Stiffness Degradation Mechanisms of Stabilized/Solidified Sediments by Freeze–Thaw Cycles

Experimental Study on the Corrosion of Fulvic Acid to Cement-Soil and Its Microstructures in the Peat Soil Environment

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