Use of hydrophilic polymeric stabilizer to improve strength and durability of fine-grained soils

Soltani-Jigheh, Hossein; Bagheri, Mehran; Amani‐Ghadim, Ali Reza

doi:10.1016/j.coldregions.2018.10.011

Cited by 49 publications

(13 citation statements)

References 32 publications

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“…Actually, except for the additives adsorbed on the surface of aggregates, the penetration of additives through the inter-aggregates pores as well as its existence at pores reduced the voids to a certain extent. Soltani-Jigheh et al [ 47 ] found that the mean diameter of pore of fine-grained soil decreased from 8.43 nm to 8.33 nm and the pore volume decreased from 16.026 cm 3 /g to 15.605 cm 3 /g due to the PAM addition according to BET results. For the admixed samples, the presence of polymer also created a great bonding between aggregates, which subsequently increased the aggregates size and enhanced the connection strength and stability.…”

Section: Resultsmentioning

confidence: 99%

“…For the admixed samples, the presence of polymer also created a great bonding between aggregates, which subsequently increased the aggregates size and enhanced the connection strength and stability. It was observed that the specific surface area of fine-grained soil reduced from 70.12 m 2 /g to 68.07 m 2 /g because of the presence of PAM [ 47 ]. Moreover, the fact that the PU and PAM polymer both produced a long chain that interlinked soil grains together and enhanced the soil resistance against shear forces, erodibility, and collapse has been indicated in the laboratory [ 13 , 14 , 37 , 48 ].…”

Section: Resultsmentioning

confidence: 99%

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Desiccation Cracking Behavior of Polyurethane and Polyacrylamide Admixed Clayey Soils

Bai

Jin

et al. 2020

Polymers

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There has been a growing interest in polymer applied for soil reinforcement in recent years. However, there little attention has been paid to the effects of polymer on soil cracking behavior, and cracks significantly change soil strength and hydraulic properties and alter reinforcement effectiveness. This study investigated the desiccation cracking behavior of polyurethane (PU) and polyacrylamide (PAM) admixed clayey soils with different polymer concentrations by performing desiccation cracking tests. Scanning electron microscope (SEM) observation was also carried out to obtain the internal structure of these soils. The results show that PU and PAM addition both prolonged the initial evaporation stage, accelerated later evaporation processes, and the effects were related to polymer concentration. Final cracks morphology analyses show that PAM addition slightly reduced the cracking and crushing degree and kept the soil relatively intact, while PU addition slightly enhanced the cracking and crushing degree of soil. In addition, PU and PAM addition both increased the width and length of cracks. The scanning electron microscopy (SEM) analyses show that the effects of polymer on soil evaporation and cracking could be concluded as: (1) storing water in voids, (2) influencing water immigration channel, (3) providing space for soil shrinkage, and (4) enhancing the connection between aggregates, which did not fully come into play because of the existence of hydrogel form. These achievements provide a certain basis for the research of desiccation cracking behavior of polymer treated soil and make significant sense for the safe and effective running of related projects.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Desiccation Cracking Behavior of Polyurethane and Polyacrylamide Admixed Clayey Soils

Bai

Jin

et al. 2020

Polymers

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“…Numerous forms of anionic PAM are produced as soil conditioners for agricultural applications in several locations globally, including to control infiltration, runoff, and soil erosion, as well as to decrease nutrient loss from the soil due to irrigation [13,14]. Recent research on the use of anionic PAM to improve dredged sediments has mostly focused on using it with powder concrete to enhance the strength and reduce the water content of dredged sediments [15][16][17]. However, little research has been conducted on the effects of PAM on vegetation growth and nutrient retention in dredged soil.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Reuse of Dredged Soil as a Substrate Material by Improvement with Polyacrylamide, Straw, and Superabsorbent Polymer

Mei

Chen

Wang

2021

Advances in Civil Engineering

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Every year, a significant quantity of dredged soil is generated as a result of channel dredging operations. However, there is relatively little evidence available regarding the sustainable reuse of dredged soils. In this study, an improved substrate material mainly composed of dredged soil was developed to examine the effects of three substrate amendments on the soil’s nutritional content, physical properties, and water retention capacity, as well as the germination rate of tall fescue. The orthogonal combination of the three substrates was controlled in a pot experiment using polyacrylamide (PAM), rice straw, and superabsorbent polymer (SAP) at application rates of 0.5, 1, 1.5, 2, and 2.5 g/kg; 15, 20, 25, 30, and 35 g/kg; and 0, 3, 6, 9, and 12 g/kg, respectively. The results showed that adequate application of PAM may improve the water retention capacity and available N retention capacity of dredged soil. PAM inhibited tall fescue germination significantly when the concentration exceeded 0.5 g/kg ( p < 0.05). The addition of rice straw significantly improved the nutritional content of dredging soil and the germination rate of tall fescue ( p < 0.05). Increased SAP significantly decreased the bulk density of dredged soil ( p < 0.05). The lowest test group was 48.20% less than CK. This study offers novel ideas for the sustainable reuse of dredged soil and serves as a guide for future research aimed at increasing the effectiveness of external-soil spray seeding technologies.

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“…Much like conventional cementitious binders, hydrophilic , miscible synthetic polymers, such as polyacrylamides, can be employed to encourage particle flocculation, mainly through clay–polymer interactions, and hence amend the soil fabric into a coherent matrix with enhanced mechanical performance [4,39,40,41,42,43,44,45,46,47]. As the global community increasingly transitions towards sustainable infrastructure construction and development practices, the use of polymeric binders, which often do not have the environmental drawbacks associated with conventional cementitious binders, has gained increased attention.…”

Section: Introductionmentioning

confidence: 99%

Engineering Reactive Clay Systems by Ground Rubber Replacement and Polyacrylamide Treatment

et al. 2019

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This study investigates the combined performance of ground rubber (GR), the additive, and polyacrylamide (PAM), the binder, as a sustainable solution towards ameliorating the inferior geotechnical attributes of an expansive clay. The first phase of the experimental program examined the effects of PAM concentration on the soil’s mechanical properties—consistency, sediment volume attributes, compactability, unconfined compressive strength (UCS), reactivity and microstructure features. The second phase investigated the effects of GR content, with and without the optimum PAM concentration. An increase in PAM beyond 0.2 g/L, the identified optimum concentration, caused the excess PAM to act as a lubricant rather than a flocculant. This feature facilitated reduced overall resistance to sliding of soil particles relative to each other, thereby adversely influencing the improvement in stress–strain–strength response achieved for ≤0.2 g/L PAM. This transitional mechanism was further verified by the consistency limits and sediment volume properties, both of which exhibited only minor variations beyond 0.2 g/L PAM. The greater the GR content, the higher the mobilized UCS up to 10% GR, beyond which the dominant GR-to-GR interaction (i.e., rubber-clustering) adversely influenced the stress–strain–strength response. Reduction in the soil’s swell–shrink capacity, however, was consistently in favor of higher GR contents. Addition of PAM to the GR-blended samples amended the soil aggregate–GR connection interface, thereby achieving further improvements in the soil’s UCS and volume change behaviors. A maximum GR content of 20%, paired with 0.2 g/L PAM, managed to satisfy a major decrease in the swell–shrink capacity while improving the strength-related features, and thus was deemed as the optimum choice.

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Use of hydrophilic polymeric stabilizer to improve strength and durability of fine-grained soils

Cited by 49 publications

References 32 publications

Desiccation Cracking Behavior of Polyurethane and Polyacrylamide Admixed Clayey Soils

Desiccation Cracking Behavior of Polyurethane and Polyacrylamide Admixed Clayey Soils

Sustainable Reuse of Dredged Soil as a Substrate Material by Improvement with Polyacrylamide, Straw, and Superabsorbent Polymer

Engineering Reactive Clay Systems by Ground Rubber Replacement and Polyacrylamide Treatment

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