Investigations for Chemical Parameters Effect on Swelling Characteristics of Expansive Soils

Reddy, Peddireddy Sreekanth; Mohanty, Bikash; Rao, B. Hanumantha

doi:10.1007/s12205-021-1532-5

Cited by 10 publications

(3 citation statements)

References 51 publications

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“…The ability of sabkha soil to swell [13] increases its geotechnical challenges. The swelling characteristics increase with an increase in sodium and calcium contents [41]. Hence, sulfate saline soil will undergo subgrade swelling and cause cracking on pavements and slope loosening [42].…”

Section: Collapse Potential Test Resultsmentioning

confidence: 99%

Improving the Consolidation Characteristics of Saline Sabkha Soil by Adding Bitumen

Al-Otaibi

2022

Jurnal Teknologi

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The rapid economic and population growth, increase in constructions, and a small selection of appropriate soil resources in Kuwait have made it necessary to research soil stabilization methods because the existing soils are currently unsuitable in their natural conditions. In this study, the consolidation characteristics of sabkha soil samples in southern Kuwait mixed with 0%, 4%, 8%, and 10% bitumen with respect to soil dry weight were investigated. For this purpose, an experimental program, including soil characterization tests, modified Proctor compaction test, one-dimensional consolidation test, and collapsibility test, was executed. Results indicate that increasing the bitumen percentage improves the compressibility characteristics of sabkha soil. Upon the addition of 10% bitumen, the yield stress increased from 25 to 34 kPa, compression index slightly increased from 0.02774 to 0.03145, and swelling index decreased from 0.0119 to 0003. Further, there was a considerable reduction in the collapse potential from 1.192 to 0.301 upon the addition of 10% bitumen. Thus, it is evident that the disadvantageous characteristics of sabkha soil can be mitigated. The results support the possibility of recycling the sabkha soil, thereby contributing toward addressing the environmental issues associated with the disposal of excavated sabkha soil.

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Section: Collapse Potential Test Resultsmentioning

confidence: 99%

Improving the Consolidation Characteristics of Saline Sabkha Soil by Adding Bitumen

Al-Otaibi

2022

Jurnal Teknologi

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“…In theory, the application of this fertilizer will also be better for the structural improvement of saline soil because the alkaline functional fertilizer contains a large amount of Ca and Mg to exchange the Na + in the soil particles. Therefore, as results of application the functional fertilizer dispersion of soil aggregates and the swelling of clay are prevented [42]. However, polyvalent cations such as Ca 2+ and Mg 2+ can not only promote the formation of soil aggregates through their own flocculation, but also maintain the stability of soil structure through ionic bond bridging [43,44] or the CaCO 3 and MgCO 3 salt bridge [45].…”

Section: Discussionmentioning

confidence: 99%

Soil Aggregate Construction: Contribution from Functional Soil Amendment Fertilizer Derived from Dolomite

Zhan

Jiang

et al. 2022

Sustainability

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Elastic and water stable macroaggregate are significant to soil structure. which is the base of the soil, to maintain sustainable agriculture. Whether and how functional amendment fertilizer is capable of construction of the macroaggregate is the main purpose of the study. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to investigate the effect of dolomite-based functional soil amendment fertilizers on soil structure. The fertilizers are beneficial to elastic-stable and water-stable aggregate construction. Calcined dolomite based soil amendment functional fertilizer (CDFF) was favorable to water-stable aggregates. The elastic-stable macroaggregate increased with lime, uncalcined dolomite based soil amendment functional fertilizer (UCDFF) and CDFF, and it was 3.0 to 4.2 times the microaggregate. The water-stable one of the CDFF was increased by 20.0%. The mean weight diameter (MWD) of the CDFF and the UCDFF increased by 0.05~0.19 mm, while that of lime only increased by 0.05 mm. The percentage of aggregate dispersion (PAD) of the CDFF was the least. SEM and EDS images revealed that Fe, Al, Si, Ca, Mg, C and O existed on the aggregates. The construction of stable aggregate lies in that the functional fertilizers can gradually neutralize soil H+ and prevent soil colloid dispersion. Soil particles are bounded together to construct micro-agglomerates and then macro-agglomerates through Ca2+, Mg2+ bond bridge and CaCO3, MgCO3 salt bridge and adhesion of SiO2, Fe2O3, Al2O3 as well as the other amorphous substances from the functional fertilizers.

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“…Chemical constituents such as Na and Ca exist in soils in different forms like total and exchangeable (Rao et al 2021; Reddy et al 2021). The total form is the direct image of the chemical elements present in soil (Tuncer et al 1977).…”

Section: Introductionmentioning

confidence: 99%

Understanding the role of Ca2+, Na+ on swelling behaviour of natural expansive soils: a field application perspective

Reddy,

Mohanty

et al. 2023

Environ Earth Sci

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Swelling behaviour is the prime hindrance for effective utilization of expansive soils as a geomaterial. To alleviate such behavior, stabilization with a suitable additive is essential. However, the current practice of additive and stabilization selection technique to treat the expansive soils predominantly relies on geotechnical properties, in particular on consistency limits. The present paper aims at demonstrating the role of chemical constituents on swelling properties in a comprehensive way. Elaborate tests to determine the swelling and chemical constituents are carried out and based on the obtained results, interrelations between them are developed. The analysis of results revealed the maximum swelling occurrence at Na T of 0.4-0.7%, Ca T of 4-5.5%, total CEC of 45-70 meq/100g, and (Ca/Na) T of 15.75 respectively. The results portray that swelling in clays is minimal when Na T <0.2%, Ca T >5.5%, and total CEC < 20 meq/100g, delineating a fact that additive selection is highly effectual and economical for those soils that comprise constituents in these prescribed limits. The results provided in the study fetches two major bene ts: rst, likely avoidance of overdose usage of stabilizer content, and second, economization of the cost of stabilization by predicting the most appropriate additive. Such kind of in-depth studies is indeed imperative to decide the direct applicability or to choose an appropriate stabilizer to amend expansive soils such that the treated soil qualify as a geomaterial in the construction of earthen structures.

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Investigations for Chemical Parameters Effect on Swelling Characteristics of Expansive Soils

Cited by 10 publications

References 51 publications

Improving the Consolidation Characteristics of Saline Sabkha Soil by Adding Bitumen

Improving the Consolidation Characteristics of Saline Sabkha Soil by Adding Bitumen

Soil Aggregate Construction: Contribution from Functional Soil Amendment Fertilizer Derived from Dolomite

Understanding the role of Ca2+, Na+ on swelling behaviour of natural expansive soils: a field application perspective

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